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Electrochemical performances of MnO2/Fe3O4/activated carbon ternary composites for supercapacitor and direct ethanol fuel cell catalyst application

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RSC Advances 2025年第21期15卷 16493-16509页

作者： Dessie, Yilkal Bekele, Eneyew Tilahun Gonfa, Bedasa Abdisa Ravikumar, C.R. Khasim, Syed Abraham, Getahun Department of Applied Chemistry College of Applied Natural Science Adama Science and Technology University Adama1888 Ethiopia Research Centre Department of Science East-West Institute of Technology Bangalore560091 India Advanced Materials Research Laboratory Department of Physics Faculty of science University of Tabuk Tabuk71491 Saudi Arabia Department of Chemistry College of Natural and Computational Sciences Kebri Dehar University P.O. Box 250 Kebri Dehar Ethiopia

MnO2 and Fe3O4 nanoparticles' slow ion-diffusion kinetics and weak electrical conductivity hinder their electrochemical performance in supercapacitors and their energy-conversion ability in direct ethanol fuel cells (DAFCs). Combining MnO2/Fe3O4 with biomass-based activated carbon (AC), which is conductive, inexpensive, and has a long cycle life, to create MnO2/Fe3O4/AC can improve their electrochemical performances for ethanol oxidation and in supercapacitors. Herein, MnO2/Fe3O4/AC ternary composites were synthesized via a facile method. The physicochemical and electrochemical properties of pure and composite materials were characterized using TGA-DTA, XRD, FTIR, BET, SEM-EDX, TEM, HRTEM, SAED, CV, and EIS. The composite MnO2/Fe3O4@8%AC exhibited the highest specific capacitance, with a value of 515.113 F g−1 at 1 A g−1. Furthermore, in cyclability tests, after 700 cycles at a current density of 1 A g−1, its charge-storage performance showed an 81.83% capacity retention and a maximum energy density of 27.679 W h kg−1. Upon integration in a DAFC, MnO2/Fe3O4@8%AC electrocatalytic ethanol oxidation was achieved with a maximum power density of 44.41 mW cm−2, indicating better performance than that of other pure and composite catalysts. Therefore, this work provides a potential candidate for use in efficient energy-storage devices and an effective catalyst electrode for the ethanol oxidation reaction. © 2025 The Royal Society of Chemistry.

关键词： Electrochemical oxidation

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A cellulose-stimulated self-assembling solvent for molecular dispersion of cellulose

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Chemical Communications 2025年第43期61卷 7855-7858页

作者： Jono, Keisuke Ogawa, Yuki Yamasaki, Naoaki Uto, Takuya Kuroda, Kosuke Faculty of Biological Science and Technology Graduate School of Natural Science and Technology Kanazawa University Kanazawa920-1192 Japan Research Laboratory of Advanced Science & Technology Corporate Research & Development Asahi Kasei Corporation Nobeoka882-0847 Japan Bemberg Division Life Innovation SBU Asahi Kasei Corporation Osaka530-8205 Japan Sustainable Polymers Laboratory Corporate Research & Development Asahi Kasei Corporation Nobeoka882-0031 Japan Department of Applied Chemistry Faculty of Engineering University of Miyazaki Miyazaki889-2192 Japan NanoMaterials Research Institute Kanazawa University Kanazawa920-1192 Japan

Triethyloctylammonium acetate was synthesised in this study;the cations self-assembled around the cellulose molecules during dissolution, resulting in the formation of low-polarity nanospaces between the cellulose molecules, and the cellulose was molecularly dispersed. The cellulose regenerated from this solution exhibited a non-oriented homogenous structure and low crystallinity. © 2025 The Royal Society of Chemistry.

关键词： Synthesis (chemical)

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50-femtosecond all polarization-maintaining fiber laser system at 1100 nm

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Optics Express 2025年第4期33卷 6850-6861页

作者： Wen, Junpeng Lin, Wei Wang, Wenlong Dong, Jiangli Xiu, Hao Fan, Yiheng Cui, Qingyue Yang, Fei Guo, Xiaoyang Liu, Yalong Wei, Xiaoming Yang, Zhongmin School of Physics and Optoelectronics South China University of Technology Guangzhou510640 China School of Materials Science and Engineering Guangdong Engineering Technology Research and Development Center of Special Optical Fiber Materials and Devices South China University of Technology Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques Guangzhou510641 China Institute of Advanced Photonics Technology School of Information Engineering Guangdong University of Technology Guangzhou510006 China Shenzhen Key Laboratory of Ultra-intense Laser and Advanced Material Technology Center for Intense Laser Application Technology College of Engineering Physics Shenzhen Technology University Shenzhen518118 China Guangzhou Yangming Laser Technology Co. Ltd Guangzhou510663 China Research Institute of Future Technology South China Normal University Guangdong Guangzhou510006 China

We demonstrate a robust high-energy all polarization-maintaining (PM) ultrashort pulse Yb-doped fiber laser system at 1100 nm that explores chirped fiber Bragg gratings (CFBGs) for pre-chirp management. This all-PM fiber laser system delivers compressed pulses at a fundamental repetition rate of 81.56 MHz with a duration of 47 fs and pulse energy of ∼40 nJ. Experimental results reveal that the temperature variation of the CFBGs has a limited influence on the temporal characteristics of compressed pulses. The use of CFBGs in an all-PM-fiber configuration simplifies the implementation of pre-chirp managed amplification, making the laser system robust and compact for practical applications. © 2025 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.

关键词： Fiber lasers

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Gradient-Enhanced Kriging-Based Parallel Efficient Global Optimization Algorithm and Its Application in Aerodynamic Shape Optimization

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IEEE Access 2025年 13卷 73848-73869页

作者： Fu, Hang Wang, Qingyu Nakashima, Takuji Kawasaki, Asahi Lai, Chenguang Shimizu, Keigo Bale, Rahul Tsubokura, Makoto Kobe University Graduate School of System Informatics Kobe6578501 Japan Institute of Auto Engineering BYD Auto Industry Company Ltd. Shenzhen518000 China Hiroshima University Graduate School of Advanced Science and Engineering Higashihiroshima Hiroshima739-8527 Japan Chongqing University of Technology College of Vehicle Engineering Chongqing400054 China Mazda Motor Corporation Research and Development Center Higashihiroshima Hiroshima730-8670 Japan Center for Computational Science Complex Phenomena Unified Simulation Research Team RIKEN Hyogo Kobe650-0074 Japan

The parallel efficient global optimization (EGO) algorithm was developed to leverage the rapid advancements in high-performance computing. However, conventional parallel EGO algorithm based on ordinary kriging (OK) model faces limitations when applied to complex, nonlinear, and high-dimensional engineering optimization problems, as OK model relies only on sample point locations, restricting the available training information. To further enhance the optimization potential of the parallel EGO algorithm, an improved system that integrates the parallel EGO algorithm with gradient-enhanced kriging (GEK) is proposed. The integration serves two main purposes: on the one hand, GEK provides a more comprehensive representation of the design space, improving the surrogate model’s predictive accuracy;on the other hand, as the number of infill points increases, GEK mitigates the unreliability of the pseudo expected improvement (PEI) function, facilitating the efficient search for high-quality global optima. To ensure high performance, various benchmark functions were used to evaluate the impact of different optimizers on the proposed system, ultimately identifying the most effective optimizer. Additionally, optimization tests were conducted on benchmark functions, airfoil aerodynamic optimization, and automotive aerodynamic optimization to compare the proposed system with traditional parallel EGO systems in optimization performance. The results demonstrate that the modified Gaussian bare-bones differential evolution (MGBDE) optimizer consistently accelerated convergence to high-quality solutions in most benchmark functions, achieving the highest average ranking across all tests. Compared to traditional parallel EGO system, the proposed method showed superior convergence speed, solution quality, and computational efficiency. Specifically, for airfoil and automotive aerodynamic optimization, when achieving the target performance improvements of 2.4% and 7.0%, the proposed system r

关键词： Shape optimization

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Efficient and Stable Photoassisted Lithium‑Ion Battery Enabled by Photocathode with Synergistically Boosted Carriers Dynamics

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Nano-Micro Letters 2025年第3期17卷 440-454页

作者： Zelin Ma Shiyao Wang Zhuangzhuang Ma Juan Li Luomeng Zhao Zhihuan Li Shiyuan Wang Yazhou Shuang Jiulong Wang Fang Wang Weiwei Xia Jie Jian Yibo He Junjie Wang Pengfei Guo Hongqiang Wang State Key Laboratory of Solidification Processing Center for Nano Energy MaterialsSchool of Materials Science and EngineeringNorthwestern Polytechnical University and Shaanxi Joint Laboratory of Graphene(NPU)Xi’an 710072People’s Republic of China State Key Laboratory of Solidification Processing School of Materials Science and Engineering DepartmentNorthwestern Polytechnical UniversityXi’an 710072People’s Republic of China State Key Laboratory of Solidification Processing Center of Advanced Lubrication and Seal MaterialsSchool of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’an 710072People’s Republic of China Research and Development Institute of Northwestern Polytechnical University in Shenzhen Shenzhen 518063People’s Republic of China Key Laboratory of Applied Surface and Colloid Chemistry Shaanxi Key Laboratory for Advanced Energy DevicesShaanxi Engineering Lab for Advanced Energy TechnologySchool of Materials Science and EngineeringNational Ministry of EducationShaanxi Normal UniversityXi’an 710119People’s Republic of China

Efficient and stable photocathodes with versatility are of significance in photoassisted lithium-ion batteries(PLIBs),while there is always a request on fast carrier transport in electrochemical active *** work proposes a general approach of creating bulk heterojunction to boost the carrier mobility of photocathodes by simply laser assisted embedding of plasmonic *** employed in PLIBs,it was found effective for synchronously enhanced photocharge separation and transport in light charging ***,experimental photon spectroscopy,finite difference time domain method simulation and theoretical analyses demonstrate that the improved carrier dynamics are driven by the plasmonic-induced hot electron injection from metal to TiO_(2),as well as the enhanced conductivity in TiO2 matrix due to the formation of oxygen vacancies after Schottky *** from these merits,several benchmark values in performance of TiO2-based photocathode applied in PLIBs are set,including the capacity of 276 mAh g^(−1) at 0.2 A g^(−1) under illumination,photoconversion efficiency of 1.276%at 3 A g^(−1),less capacity and Columbic efficiency loss even through 200 *** results exemplify the potential of the bulk heterojunction strategy in developing highly efficient and stable photoassisted energy storage systems.

关键词： Photoassisted lithium-ion batteries Bulk heterojunction Carrier dynamics TiO2 nanofiber Plasmonic metal nanocrystals

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Excited-State Energy Manipulation Enables Single-Layer White Light-Emitting Diodes to Simulate the Solar Spectrum

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ACS applied Materials and Interfaces 2025年第19期17卷 28436-28446页

作者： Chen, Xinrui Xie, Feng-Ming Xiang, Hengyang Zhang, Kai Guo, Chiyu Bi, Chenghao Wang, Run Guo, Yashuang Wang, Yifei Nie, Jiazhuo Tang, Jian-Xin Chen, Zhuoying Lu, Ruifeng Zeng, Haibo MIIT Key Laboratory of Advanced Display Materials and Devices Jiangsu Engineering Research Center for Quantum Dot Display School of Materials Science and Engineering Institute of Optoelectronics & Nanomaterials Nanjing University of Science and Technology Jiangsu Nanjing210094 China Soochow University Jiangsu Suzhou215123 China Faculty of Innovation Engineering Macau University of Science and Technology Taipa999078 China Qingdao Innovation and Development Base Harbin Engineering University Qingdao266000 China ESPCI Paris PSL University Sorbonne Université CNRS UMR 8213 10 Rue Vauquelin ParisF-75005 France Department of Applied Physics School of Physics Nanjing University of Science and Technology Jiangsu Nanjing210094 China

White light-emitting diodes (WLEDs) have been widely researched and applied for their characteristics of energy savings and environmentally friendliness. However, the spectrum of WLEDs is quite different from that of natural sunlight, and long-term use can have an impact on both physiological and psychological health. Three strategies have been designed to address the issue of spectral defects by revealing the exciton energy transfer and distribution behavior between multiple excited states. Here, single emitting layer (SEL)-WLEDs are designed to simulate the solar spectrum, which exhibits excellent spectral stability at different operating voltages, demonstrating that exciton distribution can maintain dynamic balance. In addition, these devices can accurately replicate sunlight during different time periods, with a high color rendering index (CRI ∼ 90) and a nearly 90% coverage in the human comfort region. Meanwhile, the ultraviolet, deep blue, and near-infrared regions were reduced by 100%, 80%, and 90%, respectively. These results indicate that the strategies are expected to be used to promote the physical and mental health of those who work in environments far from natural light for a long time. © 2025 American Chemical Society.

关键词： Fluorescence

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One-pot green synthesis of Ag/Ni/Fe3O4-activated carbon beads for recyclable photo-Fenton antibiotic removal and antibacterial action: mechanistic study and optimization

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RSC Advances 2025年第17期15卷 13478-13496页

作者： Hoang, Viet Hung Phan, Thi Ngoc Bich Nguyen, Van Thanh Le, Thi Thao Do, Minh Hieu Luu, Van Tuynh Tran, Vy Anh Doan, Van-Dat Le, Van Thuan Institute of Tropical Durability Vietnam-Russia Tropical Science and Technology Research Center 63 Nguyen Van Huyen Ha Noi City100000 Viet Nam Faculty of Chemical Engineering Industrial University of Ho Chi Minh City Ho Chi Minh City700000 Viet Nam Department of Material Science Institute of Applied Technology and Sustainable Development Nguyen Tat Thanh University Ho Chi Minh City700000 Viet Nam Center for Advanced Chemistry Institute of Research & Development Duy Tan University 03 Quang Trung Da Nang City550000 Viet Nam Faculty of Natural Sciences Duy Tan University 03 Quang Trung Da Nang City550000 Viet Nam

A one-pot green synthesis approach was developed to fabricate Ag/Ni/Fe3O4-activated carbon beads (Ag/Ni/MACB) using Brucea javanica as a natural carbon precursor. Unlike conventional powdered catalysts, these millimeter-sized porous beads enable easy recovery and reusability, addressing a key limitation in heterogeneous Fenton systems. The Fe3O4 component facilitated Fenton-like reactions, while Ni and Ag nanoparticles synergistically enhanced electron transfer and visible-light absorption, significantly boosting photo-Fenton efficiency. The catalyst achieved 96.78% enrofloxacin (ENR) degradation under optimized conditions, with radical scavenger experiments confirming that ˙OH and ˙O2− were the dominant reactive species. Comprehensive characterization (XRD, SEM, TEM, BET, VSM, and FTIR) verified the uniform dispersion of Fe3O4, Ni, and Ag nanoparticles (10-50 nm) within the carbon matrix, ensuring structural stability and catalytic efficiency. The incorporation of Ag not only improved light absorption but also imparted strong antibacterial properties, effectively inhibiting Escherichia coli and Staphylococcus aureus. This dual functionality allows Ag/Ni/MACB to simultaneously degrade organic pollutants and eliminate bacterial contamination, demonstrating self-cleaning capability. The catalyst retained 83.61% efficiency after five cycles with negligible metal leaching, highlighting its long-term stability and recyclability. Additionally, the degradation pathway of ENR was elucidated, providing deeper insights into the reaction mechanism. By integrating sustainable material design, enhanced photocatalytic properties, and antibacterial action, Ag/Ni/MACB serves as a versatile and cost-effective solution for wastewater treatment, offering simultaneous pollutant degradation and microbial disinfection in a single step. © 2025 The Royal Society of Chemistry.

关键词： Disinfection

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Vacancy-Type Defects in HfO2 Layers and Their Role in Amorphous-to-Crystalline Transition Studied by Monoenergetic Positron Beams

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IEEE Transactions on Semiconductor Manufacturing 2025年

作者： Uedono, Akira Kawakami, Kazuya Kuribara, Tatsunori Hasunuma, Ryu Harashima, Yosuke Shigeta, Yasuteru Ni, Zeyuan Yan, Ruolin Nakamura, Hideo Notake, Akira Moriya, Tsuyoshi Michishio, Koji Ishibashi, Shoji University of Tsukuba Faculty of Pure and Applied Science Tsukuba Ibaraki305-8573 Japan Nara Institute of Science and Technology Graduate School of Science and Technology Ikoma Nara630-0192 Japan Tokyo Electron Technology Solutions Ltd S-Technology Development Center Nirasaki Yamanashi650 Japan Tokyo Electron Technology Solutions Ltd Development Department1 Nirasaki Yamanashi407-0192 Japan Tokyo Electron Ltd Digital Design Center Sapporo Hokkaido060-0003 Japan Tokyo Electron Technology Solutions Ltd Software and Data Engineering Division Nirasaki Yamanashi407-0192 Japan National Institute of Advanced Industrial Science and Technology Research Institute for Measurement and Analytical Instrumentation Tsukuba Ibaraki305-8568 Japan National Institute of Advanced Industrial Science and Technology Research Center for Computational Design of Advanced Functional Materials Tsukuba Ibaraki305-8568 Japan

The annealing properties of vacancies in HfO2 layers deposited on Si substrates and their role in amorphous-to-crystalline transition were studied with monoenergetic positron beams. HfO2 layers with a thickness of 4.30 nm were fabricated by the atomic layer deposition technique. The major vacancytype defects in these layers were identified as a Hf vacancy (VHf) coupled with multiple oxygen vacancies (VOs) and larger vacancy clusters. After annealing at 500°C, the concentration of vacancy clusters started to increase, which was attributed to the agglomeration of intrinsic open spaces in the amorphous phase upon the phase transition from amorphous to monoclinic crystalline phases. The amorphous-crystalline transition started near the interface between the HfO2 layer and bottom electrodes (TiN). After the crystallization, the concentration of vacancy clusters decreased as the annealing temperature increased. © 2025 IEEE.

关键词： Hafnium oxides

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No Imputation Without Representation 35th

No Imputation Without Representation

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35th Benelux Conference on Artificial Intelligence and Machine Learning, BNAIC/Benelearn 2023

作者： Lenz, Oliver Urs Peralta, Daniel Cornelis, Chris Leiden Institute of Advanced Computer Science Leiden University Leiden Netherlands Research Group for Computational Web Intelligence Department of Applied Mathematics Computer Science and Statistics Ghent University Ghent Belgium Department of Information Technology Ghent University Ghent Belgium

ISBN: (纸本)9783031746499

By filling in missing values in datasets, imputation allows these datasets to be used with algorithms that cannot handle missing values by themselves. However, missing values may in principle contribute useful information that is lost through imputation. The missing-indicator approach can be used in combination with imputation to instead represent this information as a part of the dataset. There are several theoretical considerations why missing-indicators may or may not be beneficial, but there has not been any large-scale practical experiment on real-life datasets to test this question for machine learning predictions. We perform this experiment for three imputation strategies and a range of different classification algorithms, on the basis of twenty real-life datasets. In a follow-up experiment, we determine attribute-specific missingness thresholds for each classifier above which missing-indicators are more likely than not to increase classification performance. And in a second follow-up experiment, we evaluate numerical imputation of one-hot encoded categorical attributes. We reach the following conclusions. Firstly, missing-indicators generally increase classification performance. Secondly, with missing-indicators, nearest neighbour and iterative imputation do not lead to better performance than simple mean/mode imputation. Thirdly, for decision trees, pruning is necessary to prevent overfitting. Fourthly, the thresholds above which missing-indicators are more likely than not to improve performance are lower for categorical attributes than for numerical attributes. Lastly, mean imputation of numerical attributes preserves some of the information from missing values. Consequently, when not using missing-indicators it can be advantageous to apply mean imputation to one-hot encoded categorical attributes instead of mode imputation. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2025.

关键词： Adversarial machine learning

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Synergetic effects of multiple junction and surface hydroxyl in Cu/CuO/Cu2O/TiO2 heterostructures towards highly efficient photocatalysts for hydrogen generation

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Materials science for Energy Technologies 2025年 8卷 131-142页

作者： Subagyo, Riki Anindika, Garcelina Rizky Aufkani, Afif Akmal Zhang, Lei Ardhyananta, Hosta Burhan, R.Y. Perry Nugraheni, Zjahra Vianita Akhlus, Syafsir Bahruji, Hasliza Prasetyoko, Didik Wellia, Diana Vanda Ivansyah, Atthar Luqman Arramel Kusumawati, Yuly Department of Chemistry Faculty of Science and Analytic Data Institut Teknologi Sepuluh Nopember Surabaya60111 Indonesia Center of Excellence Applied Physics and Chemistry Nano Center Indonesia Jl PUSPIPTEK South Tangerang Banten15314 Indonesia Department of Physics National University of Singapore Singapore117551 Singapore Department of Materials and Metallurgical Engineering Faculty of Industrial Technology and Systems Engineering Institut Teknologi Sepuluh Nopember Surabaya60111 Indonesia Centre of Advanced Material and Energy Science Universiti Brunei Darussalam Jalan Tungku Link BE 1410 Brunei Department of Chemistry Faculty of Mathematics and Natural Sciences Universitas Andalas Padang25163 Indonesia Master Program in Computational Science Faculty of Mathematics and Natural Science Institut Teknologi Bandung Jalan Ganesha No. 10 Bandung40132 Indonesia Instrumentation and Computational Physics Research Group Department of Physics Faculty of Mathematics and Natural Sciences Institut Teknologi Bandung Jalan Ganesha No.10 West Java Bandung40132 Indonesia

The implementation of titanium dioxide (TiO2) as a photocatalyst material in hydrogen (H2) evolution reaction (HER) has embarked renewed interest in the past decade. Rapid electron-hole pairs recombination and wide band gap of a photo-sensitive material of TiO2 are detrimental toward the targeted catalytical reaction. In this study, we present the rational design, fabrication, photocatalytic performance of TiO2-Cu/CuO/Cu2O heterostructures (CuTi) using viable chemical reduction method. The Z-scheme and S-scheme are succesfully generated across the TiO2/CuO/Cu2O interfaces, while the Schottky junction arises on the Cu perimeters. This is evidenced from the blue shifted about 0.3 eV of Cu 2p core level determined by using X-ray photoemission spectroscopy (XPS), in combination with the formation of inverse V-shape of the Mott-Schottky plots. In addition, we find that Cu/CuO/Cu2O facilitates photon absorption range up to the visible region. The multiple heterojunction and the large number of OHsurface enhanced charge carrier transfer are associated to the suppression of photoluminescence (PL) intensity, high surface hydroxyl (OHsurface) density in CuTi probed by XPS, and fast electron transfer based on the electrochemical measurements. The presence of OHsurface inhibits the recombination of electron. A significant H2 photogeneration rate enhancement is achieved when an optimized 5 wt% Cu/CuO/Cu2O concentration is used on TiO2 to achieve 7,157.19 μmol·g−1 (1,789.30 μmol·g−1·h−1). Based on this finding, zero emission energy innitiative could be materialized under multiple heterojunctions in photocatalytic process is beneficial for enhancing the H2 production. © 2025 The Authors

关键词： Titanium dioxide

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