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Low Temperature Method-Based Evaporation/Spray-Coating technology for Wide Bandgap Perovskite Solar Cells

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SSRN 2024年

作者： Liang, Cheng Du, Hong-Qiang Geng, Cong Yu, Xinxin Jiang, Xiongzhuang Huang, Shangwei Long, Fei Han, Liyuan Li, Wangnan Liang, Guijie Li, Bin Cheng, Yi-Bing Peng, Yong State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China College of Materials Science and Engineering Guilin University of Technology Guangxi Guilin541004 China State Key Laboratory of Metal Matrix Composites Shanghai Jiao Tong University Shanghai200240 China Hubei Key Laboratory of Low Dimensional Optoelectronic Materials and Devices Hubei University of Arts and Science Xiangyang441053 China Hubei Longzhong Laboratory Wuhan University of Technology Xiangyang Demonstration Zone Xiangyang441000 China

Years of working on perovskite solar cells (PSCs) based tandem devices and single-junction devices have approved that low annealing temperature can be beneficial of improving devices performances. In this paper, a pseudo-halogen ion engineering works well in the evaporation/spray-coating method. According to our research, it is proved that the addition of formamidine acetate (FAAc) can effectively reduce annealing temperature from 170 ℃ to 150 ℃, accelerate the maturation process of the perovskite films, and broaden the annealing window. As a result, a perovskite film with homogeneous crystallization and low residual stress is achieved, leading to extended charge carrier lifetimes, elevated photoluminescence quantum yields (PLQY), reduced Urbach energies. The corresponding PSCs prepared through evaporation/spray-coating method achieve an impressive power conversion efficiency (PCE) of 19.46%, which is the highest efficiency among wide-bandgap (WBG) PSCs fabricated by this method. And the unencapsulated devices exhibit satisfactory stability, retaining 80% of the initial PCE after 600 h of thermal aging at 60 ℃ and retaining 90% of the initial PCE after 1500 h of 50% humidity aging at 25 °C, respectively. © 2024, The Authors. All rights reserved.

关键词： Evaporation

Controlled Incorporation of Zn into Nitrogen-Doped Porous Carbon Boosts the Alcohol Dehydrogenation to Carboxylic Acids

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SSRN 2024年

作者： Gu, Jun-Fei Chen, Cheng Chaemchuen, Somboon Sang, Wei Li, Xing-Chuan Yuan, Ye Kou, Zongkui Verpoort, Francis State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology 122 Luoshi Road Wuhan430070 China Sanya Science and Education Innovation Park of Wuhan University of Technology Sanya572000 China 6 Miklukho-Maklaya Str. Moscow117198 Russia

The dehydrogenation of primary alcohols to carboxylic acids is a crucial process in chemical industries such as fibers and plastics. Carboxylic acids, the resulting products, are not only important chemical raw materials but also fundamental pharmaceutical intermediates. Zn-based catalysts have gained attention as a promising option for this transformation owing to their economic cost and abundant reserves. However, stability issues, including structure collapse and morphological changes, have plagued the reported Zn-based catalysts during this transformation. In response to these challenges, this study focused on the design and development of Zn-based catalysts via controlled incorporation of Zn into nitrogen-doped porous carbon to modulate the numbers of defects and Lewis acid-base site pairs. Through extensive screening of various parameters, the best-performing catalyst, namely Zn@NC-800, exhibited high activity and remarkable stability, surpassing all the reported Zn-based catalysts. Moreover, this catalyst demonstrated great recyclability since it could maintain approximately 90% yields after 9 cycles. Notably, the product formation rate of this catalyst could reach 3833 μmol·gcat-1·h-1, exceeding that of most reported non-noble metal heterogeneous catalysts. Consequently, this study offers a promising approach for efficiently and stably catalyzing alcohol dehydrogenation reactions using non-noble metals. © 2024, The Authors. All rights reserved.

关键词： Carboxylic acids

Magneto-enhanced electro-thermal conversion performance

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Science China materials 2021年第11期64卷 2835-2845页

作者： Shifang Ma Cuncheng Li Wenjun Cui Xiahan Sang Ping Wei Wanting Zhu Xiaolei Nie Fu-Hua Sun Wenyu Zhao Qingjie Zhang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Foshan 528000China Nanostructure Research Center Wuhan University of TechnologyWuhan 430070China

Synergistically regulating carrier and phonon transport on the nanoscale is extremely difficult for all thermoelectric(TE)materials without cage *** BaFe_(12)O_(19)/Bi_(2)Te_(2.5)Se_(0.5)thermoelectromagnetic nanocomposites are designed and synthesized as a benchmarking example to simultaneously tailor the transport properties on the nanoscale.A magneto-trapped carrier effect induced by BaFe_(12)O_(19)hard-magnetic nanoparticles(NPs)is discovered,which can lower the carrier concentration of n-type Bi_(2)Te_(2.5)Se_(0.5)matrix by 16%,and increase the Seebeck coefficient by 16%.Meanwhile,BaFe_(12)O_(19)NPs provide phonon scattering centers and reduce the thermal conductivity by 12%.As a result,the ZT value of the nanocomposites is enhanced by more than 25%in the range of 300-450 K,and the cooling temperature difference increases by 65%near room *** work greatly broadens the commercial application potential of ntype Bi_(2)Te_(2.5)Se_(0.5),and demonstrates magneto-trapped carrier effect as a universal strategy to enhance the electro-thermal conversion performance of TE materials with high carrier concentration.

关键词： thermoelectromagnetic nanocomposite thermoelectric material magnetic nanoparticles magneto-trapped carrier effect electro-thermal conversion performance

Enhancing the Humidity Resistance of Perovskite Photovoltaics: Comprehensive PbI2 Management Utilizing Long-Chain Ionic Liquid

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SSRN 2024年

作者： Sun, Yonggui Wang, Fei Lu, Lu Wang, Taomiao Yang, Guo Liang, Xiao Zhou, Xianfang Sun, Xiaokang Li, Qiannan Li, Yongjun Zhang, Fan Duan, Dawei Zhu, Jiajie Zhu, Quanyao Hu, Ruiyuan Yuan, Mingjian Hu, Hanlin Hoffmann Institute of Advanced Materials Shenzhen Polytechnic University 7098 Liuxian Boulevard Shenzhen518055 China Nanjing University of Posts and Telecommunications Nanjing210023 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Materials Science and Engineering Wuhan University of Technology Wuhan China Shenzhen University China College of Chemistry Nankai University Tianjin China

Effectively managing residual PbI2 in two-step perovskite fabrication, while simultaneously enhancing the device performance, especially its humidity stability, poses a significant challenge. Herein, we introduced a novel ionic liquid (IL) molecule, long-chain alkane-based 1-octyl-3-methylimidazolium chloride (OMIMCl), with excellent hydrophobicity to regulate the perovskite conversion process, aiming to enhance the performance of resulting perovskite solar cells. The introduction of OMIMCl contributes to the formation of a uniform porous PbI2 film, facilitating comprehensive penetration of the second-step organic salt to fully convert PbI2 into perovskite material. Interestingly, nearly no residual PbI2 clusters are observed at both the top and bottom surfaces of OMIMCl-modified perovskite films. Meanwhile, depth-resolved grazing incidence wide-angle x-ray scattering (GIWAXS) measurements have quantitatively demonstrated the reduction of PbI2 in OMIMCl-modified perovskite thin films. Notably, the incorporation of OMIMCl retards the growth rate of perovskite crystals efficiently, thereby assisting in generating high-quality of perovskite films with larger grain size. Moreover, density functional theory (DFT) calculations of binding energy numerically demonstrate the hydrophobic property of IL OMIMCl, which plays a crucial role in improving the humidity stability of PSCs, as evidenced by direct water-dipping test. Consequently, we achieved a champion power conversion efficiency (PCE) of 24.72% and significantly improved long-term stability. © 2024, The Authors. All rights reserved.

关键词： Lead compounds

Hot workability and dynamic recrystallization mechanisms of pure nickel N6

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Transactions of Nonferrous Metals Society of China 2022年第10期32卷 3259-3275页

作者： Zhi JIA Bao-lin WEI Xuan SUN Jin-jin JI Yan-jiang WANG Li-dan YU School of Materials Science and Engineering Lanzhou University of TechnologyLanzhou 730050China State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals Lanzhou University of TechnologyLanzhou 730050China School of Materials Engineering Lanzhou Institute of TechnologyLanzhou 730050China

The hot workability and dynamic recrystallization(DRX)mechanisms of pure nickel N6 were systematically investigated using hot compression *** on hot compression data,the constitutive equation of N6 was developed and its reliability was *** hot processing map was constructed,and combined with microstructural observations,a semi-quantitative response relationship between hot deformation parameters and microstructure was *** DRX process of N6 is a thermally activated process and particularly sensitive to the strain *** optimal hot processing parameters for N6 were determined to be 950−1050℃ and 0.1−1 s^(−1).Furthermore,it was proven that the dominant nucleation mechanism is discontinuous DRX characterized by grain boundary bulging and twins assisting nucleation,while the continuous DRX characterized by subgrains combined with rotation is an inactive nucleation mechanism.

关键词： pure nickel N6 microstructure evolution hot workability processing map dynamic recrystallization

Low-Pt Anodes with Gradient Molybdenum Isomorphism for High Performance and Anti-Co Poisoning Pemfcs

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SSRN 2023年

作者： Jin, Changqing Liao, Yucong Zhang, Aojie Zhao, Shengqiu Wang, Rui Li, Junsheng Tang, Haolin State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Xianhu Hydrogen Valley Foshan528200 China School of Chemistry Chemical Engineering and life Sciences Wuhan University of Technology Wuhan430070 China

The development of low Pt-loading hydrogen oxidation reaction electrocatalysts with high catalytic activity, high durability, and resistance to CO poisoning is essential for the commercialization of proton exchange membrane fuel cells. Herein, two kinds of low Pt-loading HOR catalysts, PtMo1/KB with the synergistic effect of PtMo alloy particles (APs), Pt single atoms (SAs) and Mo SAs and PtMo10/KB with the synergistic effect of PtMo atomic clusters (ACs), Pt SAs and Mo SAs, were fabricated. Electrochemical tests show that PtMo1/KB (1.85 wt.% Pt) exhibits extraordinary HOR activity and durability, with mass activity in electrochemical cells and even in PEMFCs that are 8.36 times and 2.71 times higher than that of commercial Pt/C, respectively. In addition, PtMo10/KB (1.56 wt.% Pt) was tested in electrochemical cells and PEMFCs in H2/1000 ppm CO and its resistance to CO poisoning was superior to that of commercial Pt/C. DFT calculations showed that the adsorption energy of the intermediates H* and CO was optimized by tuning the d-band center of Pt, thus enhancing the HOR activity and CO tolerance of the catalyst. Meanwhile, in situ CO-adsorption surface-enhanced infrared adsorption spectroscopy also confirmed that the weakening of the Pt-CO bond strength and the adsorption energy of CO contributed to the improvement of CO tolerance in PtMo10/KB. © 2023, The Authors. All rights reserved.

关键词： Electrocatalysis

Domain Evolution, Dielectric and Piezoelectric Response in Bent Freestanding PbTiO3 Ferroelectric Nanowires

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SSRN 2024年

作者： Zhou, Meng-Jun Peng, Kun Tan, Yueze Yang, Tiannan Chen, Long-Qing Nan, Ce-Wen State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Center of Smart Materials and Devices School of Materials Science and Engineering Wuhan University of Technology Wuhan430070 China Department of Materials Science and Engineering Materials Research Institute The Pennsylvania State University University ParkPA16802 United States School of Mechanical Engineering Shanghai Jiao Tong University Shanghai200240 China School of Materials Science and Engineering State Key Lab of New Ceramics and Fine Processing Tsinghua University Beijing100084 China

Ferroelectric oxides with excellent flexibility are of significant practical and theoretical interests in recent studies. With most up-to-date research efforts, the effect of large bending on properties of nano-scale ferroelectric materials is still to be investigated. In this work, we elucidate the effect of bending angle on ferroelectric domain structures and material properties of bending PbTiO3 nanowires using phase-field simulations and thermodynamic modeling. We find non-monotonic dependencies of the coercive fields, dielectric responses and piezoelectric properties on the bending angle. A maximum enhancement of 462% and 226% in the dielectric constant and piezoelectric coefficient, respectively, is achieved at an 18° bending angle for the PbTiO3 nanowire with a radius of R = 10 nm and length L=100 nm, which is attributed to the formation of strong-response zones within the nanowire as illustrated by both the phase-field and thermodynamic analysis. The current work provides useful theoretical insights for the experimental explorations into ferroelectric functionalities of nanomaterials and potential applications of high-performance flexible ferroelectric-based nanodevices. © 2024, The Authors. All rights reserved.

关键词： Piezoelectricity

Biodegradable Zn-2 Cu-0.8 Mn Alloy with a Promising Balance of Mechanical Property and Uniform Corrosion

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SSRN 2024年

作者： Wang, Xue Li, Ruimin Zhang, Hongfei Gao, Yubi Ding, Yutian State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals Lanzhou University of Technology Lanzhou730050 China School of Materials Science and Engineering Lanzhou University of Technology Lanzhou730050 China

Currently, degradable Zn alloys suffer from the critical problem that the mechanical and corrosion properties do not synergize to meet the standards for bio-implantable materials. Zn-Cu-Mn alloys obtained by alloying Cu, Mn elements and preparing by hot extrusion and deformation were comprehensively investigated for their microstructure, mechanical properties and corrosion behavior. The results show that the strength and plasticity of Zn-2Cu-0.8Mn alloy are synergistically enhanced. The yield strength, ultimate tensile strength and elongation were 310.47±2.7 MPa, 355.43±3.2 MPa and 29.07±0.1%, respectively. This is mainly due to the significant grain refinement and uniform distribution of the second phase (CuZn5, MnZn13) in the Zn matrix, leading to a synergistic increase in strength and ductility. Results of the immersion experiments show that pure Zn corrosion is the most serious, mainly dominated by grain boundary corrosion, and serious localized corrosion occurs in Zn-2Cu. The addition of Mn (0.8 wt.%) element effectively improves the problem of inhomogeneous corrosion and pitting corrosion of the Zn alloy, and improves the corrosion resistance of the Zn alloy. This is due to the generation of a dense Zn3(PO4)2·(H2O)4 corrosion product layer on the surface of the alloy, which provides good protection for the substrate. In addition, the fine and uniform distribution of the Zn-2Cu-0.8Mn alloy grains and the fragmented second phase further contributes to the degradation of the Zn-2Cu-0.8Mn alloy in a uniform corrosion mode. This provides a good design idea for designing to satisfy the mechanical properties while degrading in a uniform corrosion mode. © 2024, The Authors. All rights reserved.

关键词： Microstructure

Exploring the Aging Characteristics of Poly(Ionic Liquid)S-Based Thermal Interface materials

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Exploring the Aging Characteristics of Poly(Ionic Liquid)S-B...

International Conference on (ICEPT) Electronic Packaging technology

作者： Jianhui Zeng Baohao Yang Zeyu Zheng Taoying Rao Yucheng Jiang Dexin Chen Liejun Li Yimin Yao Rong Sun State Key Laboratory of Materials for Integrated Circuits Shenzhen Institute of Advanced Electronic Materials Shenzhen Institute of Advanced Technology Chinese Academy of Sciences Shenzhen China Research Institute of Materials Science South China University of Technology Guangzhou China Guangdong Key Laboratory for Processing and Forming of Advanced Metallic Materials School of Mechanical & Automotive Engineering South China University of Technology Guangzhou China Institute of Advanced Wear & Corrosion Resistant and Functional Materials Jinan University Guangzhou China

ISBN: (数字)9798350353808

ISBN: (纸本)9798350353815

Thermal interface materials (TIMs) are essential for managing heat in electronics. Silicone systems face challenges such as leakage of silane molecules, limited mechanical flexibility, poor filler compatibility and weak interfacial adhesion. In contrast, poly(ionic liquid)s (PILs) have emerged as promising alternatives due to their exceptional mechanical flexibility, thermal stability, robust interfacial adhesion across various substrates, filler compatibility, self-healing properties, and reprocessability. Yet, a critical gap exists in the thermo-physical and reliability characterization of PILs and their composites. This study introduces a novel TIM composed of PILs and Ga-based liquid metal (LM). The strong interaction between PILs and LM imparts the obtained composites a certain degree of flexibility and superior interface adhesion, making it suitable for use as TIMs. Specifically, the obtained TIM (80% mass fraction of LM) possesses a thermal conductivity of 1.2 W/(m.K) and exhibit an interfacial adhesion strength of 1.1 MPa with silicon, excellent thermal stability (>350°C). Furthermore, the aging characteristics of PIL and its composites with LM were also evaluated in terms of coverage change. This work established a critical foundation for the feasibility study of PIL as a TIM matrix.

关键词： Heating systems Adhesives Aging Thermal conductivity Mechanical factors Silicon Steel