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Positive spin Hall magnetoresistance in single-crystalline Pt/CoO(001) bilayers

Physical Review B 2022年第13期106卷 134425-134425页

作者： Jia Xu Mengwen Jia Chao Zhou Qian Li Padraic Shafer Gong Chen Mengmeng Yang Alpha T. N’Diaye Elke Arenholz Ziqiang Qiu Yizheng Wu Department of Physics School of Physics and Telecommunication Engineering Shaanxi University of Technology Hanzhong 723001 China Department of Physics and State Key Laboratory of Surface Physics Fudan University Shanghai 200433 China National Synchrotron Radiation Laboratory University of Science and Technology of China Hefei Anhui 230029 China Advanced Light Source Lawrence Berkeley National Laboratory Berkeley California 94720 USA Department of Physics Georgetown University Washington DC 20057 USA Institute of Physical Science and Information Technology Anhui University Hefei Anhui 230601 China Department of Physics University of California at Berkeley Berkeley California 94720 USA Shanghai Research Center for Quantum Sciences Shanghai 201315 China

The spin Hall magnetoresistance (SMR) effect in single-crystalline Pt/CoO(001) bilayers has been systematically investigated. X-ray magnetic linear dichroism measurements prove that CoO antiferromagnetic (AFM) spins can be switched into the direction orthogonal to the applied field. We find the SMR signal is comprised of two components related to either the switching of CoO AFM Néel order or the applied strong field effect. Both SMR components show a “positive” angular dependence with R∥>R⊥, while R∥(R⊥) is defined as the resistance with the applied in-plane field parallel (perpendicular) to the current. The observed positive SMR is mainly attributed to the uncompensated spins at the Pt/CoO interface, instead of the CoO AFM spins. Our study may attract a great deal of interest to understand the complicated SMR effect in AFM spintronics materials.

关键词： Antiferromagnetism Magnetization switching Magnetoresistance Spin Hall magnetoresistance Antiferromagnets Interfaces Single crystal materials Thin films Hall bar Molecular beam epitaxy Resistivity measurements X-ray magnetic linear dichroism

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Synergistic enhancement of thermoelectric properties in carbon nanotube networks via biomass lignin

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Journal of Colloid and Interface Science 2025年 698卷 138057页

作者： Li, Hui Zhang, Han Zhu, Jianhao Hu, Ningjiang Du, Feipeng Liu, Siqi Erden, Fuat Yang, Ming Li, Pengcheng He, Chaobin Hubei Key Laboratory of Plasma Chemistry and Advanced Materials Hubei Engineering Technology Research Center of Optoelectronic and New Energy Materials State Key Laboratory of Green and Efficient Development of Phosphorus Resources School of Materials Science and Engineering Wuhan Institute of Technology Wuhan430205 China Department of Materials Science & Engineering National University of Singapore 9 Engineering Drive 1 117574 Singapore 117602 Singapore Department of Aeronautical Engineering Sivas University of Science and Technology Sivas58000 Turkey Hubei Integrative Technology and Innovation Center for Advanced Fiberous Materials 430299 China

Despite interconnected uniform carbon nanotubes (CNTs) networks can lead to ultrahigh electrical conductivity, the concomitant relatively low Seebeck coefficient results in an inferior thermoelectric (TE) power factor due to the typical trade-off relationship between electrical conductivity and Seebeck coefficient. Herein, we present a facile approach to enhance the TE performance of CNT composites by embedding lignin into highly conductive CNT network via a dip-coating approach. The energy filtering effect at the CNTs/lignin interfaces enables a significant improvement in the Seebeck coefficient. Concurrently, the preservation of the CNTs conductive network structure ensures continuous pathways for carrier transport, thereby maintaining a moderate magnitude of electrical conductivity despite the incorporation of insulating lignin. Through systematic optimization of lignin concentration and soaking duration, a maximum power factor of 550.5 μW m−1 K−2 is achieved for the CNTs/lignin composite prepared with a 2 mg mL−1 lignin solution for 5 min, superior to that of most reported CNTs based composite films. Considering the remarkable TE performance, a TE device comprising 5 pairs of CNTs/lignin films and Ni wires is fabricated to deliver a high output power of 220 nW at ΔT of 30 K. Moreover, the device exhibited remarkable temperature-sensing capabilities and stable voltage response, highlighting its potential application as a wearable power source and temperature sensor. This work not only provides a feasible strategy for synergistically enhancing the TE properties of CNT composites using biomass lignin, but also paves the way for the utilization of biomass lignin for wearable electronics. © 2025

关键词： Nanocomposite films

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Unraveling the pseudocapacitive sodium-ion storage mechanism of birnessite in organic electrolytes

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Chinese Chemical Letters 2024年

作者： Qinyao Jiang Binhao Wang Zerui Yan Sicheng Fan Dafu Tang Biwei Xiao Qiulong Wei Department of Materials Science and Engineering Fujian Key Laboratory of Surface and Interface Engineering for High Performance Materials College of Materials Xiamen University Xiamen 361005 China GRINM (Guangdong) Research Institute for Advanced Materials and Technology Foshan 528051 China

Earth-abundant, layered birnessite is promising cathode for electrochemical capacitors due to the presence of confined nanofluids in interlayers for rapid ion storage. Previous work has demonstrated the capacitive co-intercalation of water and K + ions into birnessite in aqueous electrolytes, but in-depth quantitative investigations of the interactions between confined water and an external organic electrolyte are still lacking. In this work, we reveal the intercalation pseudocapacitance of hydrated birnessite (Na 0.4 MnO 2 ⋅0.53H 2 O) in sodium-based organic electrolytes via operando electrochemical quartz crystal microbalance (EQCM), and ex situ X-ray diffraction and Raman spectroscopy. The Na + ions are completely desolvated at the Na 0.4 MnO 2 ⋅0.53H 2 O-organic electrolyte interfaces and intercalate into the interlayers, while the confined water does not co-extract. The net Na + intercalation is a pseudocapacitive behavior without phase changes, displaying a high capacitive contribution of 85.6% at 1.0 mV/s. Additionally, EQCM results indicate the contributions of cation-dominated electric double layer (EDL) adsorption to the total charge storage. By replacing different solvents and anions in sodium-based organic electrolytes, we verify that Na + pseudocapacitive intercalation dominates the charge storage properties.

关键词： Pseudocapacitance Sodium-ion storage Interlayer confinement Birnessite EQCM

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Heat Transport in Herbertsmithite: Can a Quantum Spin Liquid Survive Disorder?

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Physical Review Letters 2021年第26期127卷 267202-267202页

作者： Y. Y. Huang Y. Xu Le Wang C. C. Zhao C. P. Tu J. M. Ni L. S. Wang B. L. Pan Ying Fu Zhanyang Hao Cai Liu Jia-Wei Mei S. Y. Li State Key Laboratory of Surface Physics and Department of Physics Fudan University Shanghai 200438 China Key Laboratory of Polar Materials and Devices (MOE) School of Physics and Electronic Science East China Normal University Shanghai 200241 China Shenzhen Institute for Quantum Science and Engineering and Department of Physics Southern University of Science and Technology Shenzhen 518055 China Shenzhen Key Laboratory of Advanced Quantum Functional Materials and Devices Southern University of Science and Technology Shenzhen 518055 China Collaborative Innovation Center of Advanced Microstructures Nanjing 210093 China Shanghai Research Center for Quantum Sciences Shanghai 201315 China

One favorable situation for spins to enter the long-sought quantum spin liquid (QSL) state is when they sit on a kagome lattice. No consensus has been reached in theory regarding the true ground state of this promising platform. The experimental efforts, relying mostly on one archetypal material ZnCu3(OH)6Cl2, have also led to diverse possibilities. Apart from subtle interactions in the Hamiltonian, there is the additional degree of complexity associated with disorder in the real material ZnCu3(OH)6Cl2 that haunts most experimental probes. Here we resort to heat transport measurement, a cleaner probe in which instead of contributing directly, the disorder only impacts the signal from the kagome spins. For ZnCu3(OH)6Cl2, we observed no contribution by any spin excitation nor obvious field-induced change to the thermal conductivity. These results impose strong constraints on various scenarios about the ground state of this kagome compound: while certain quantum paramagnetic states other than a QSL may serve as natural candidates, a QSL state, gapless or gapped, must be dramatically modified by the disorder so that the kagome spin excitations are localized.

关键词： Frustrated magnetism

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Multi-layer alternating structured alginate hydrogels featuring exceptional flexibility and electromagnetic shielding performance

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Journal of Colloid and Interface Science 2025年第PT 1期699卷 138103页

作者： Taian He Chuyang Liu Zhiwei Chen Chuanhui Nie Wangpeng Ren Yujing Zhang Hang Zhang Guangbin Ji School of Material Science and Technology Nanjing University of Aeronautics and Astronautics Nanjing 210016 PR China School of Materials Science and Engineering Nanjing University of Science and Technology Nanjing 210094 PR China Aviation Key Laboratory of Science and Technology on Advanced Surface Engineering AVIC Manufacturing Technology Institute Beijing 100024 PR China

The booming development of flexible electronic devices requires innovate electromagnetic shielding materials integrated with both superior flexibility and absorption capacities. Hydrogels incorporated with conductive fillers emerge as formidable contenders while suffer inadequate electromagnetic shielding performance and significant secondary pollution. In this work, the efficient synergy of CNTs and Co nanoparticles bestowed the hydrogel with both favorable dielectric and magnetic loss for efficient electromagnetic shielding performance. Concurrently, the Co-CNT hydrogel film exhibits a certain mechanical property owing to the hydrogen bonds between CNT/Co-CNT particles and SA hydrogel. Furthermore, the design of multi-layer structure, intricately interspersed with fillers of Co-CNT and CNT in an alternating pattern, features an “absorption-reflection-reabsorption” mechanism to reinforce the dissipation of electromagnetic waves within the hydrogels. Ultimately, the CNT/Co-CNT multi-layer hydrogel achieves an outstanding mechanical flexibility and considerable electromagnetic shielding performance of 41 dB at 0.7 mm, while the SE A /SE T value is greater than 85 %, which is conspicuously superior to the majority of electromagnetic shielding conductive hydrogel materials. This work offers a novel idea for the development of intelligent flexible EMI shielding materials and holds latent application prospects in the fields of wearable smart devices and military applications.

关键词： CNT Electromagnetic interference shielding Hydrogel Multi-layer construction

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Towards sustainable and intelligent urban transportation: A novel deep transfer reinforcement learning framework for eco-driving of fuel cell buses

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Energy 2025年 330卷

作者： Huang, Ruchen He, Hongwen Su, Qicong Wu, Jingda National Key Laboratory of Advanced Vehicle Integration and Control Beijing Institute of Technology Beijing100081 China School of Mechanical Engineering Beijing Institute of Technology Beijing100081 China School of Engineering and Design Technical University of Munich Munich80333 Germany Department of Aeronautical and Aviation Engineering The Hong Kong Polytechnic University Hong Kong

Eco-driving is a sustainable technology that optimizes both energy management and speed planning for electrified vehicles. Particularly when combined with emerging deep reinforcement learning (DRL) techniques, eco-driving strategies (EDSs) can be more intelligent. However, current research on eco-driving, namely the holistic solution, lags behind the advancements in its sub-problem namely energy management, and the development of DRL-based EDSs remains time-consuming. Since energy management is a sub-task of eco-driving, it offers a potential way to rapidly develop EDSs by reusing pre-trained energy management strategies (EMSs). Based on this, this paper proposes an expedited method for developing soft actor-critic (SAC) based EDSs for fuel cell buses (FCBs) in the vehicle-following scenario. To ensure that SAC-based EMSs can be effectively transferred to EDSs, an innovative heterogeneous deep transfer reinforcement learning framework is designed. Within this framework, all the knowledge learned in the source EMS can be transferred and reused by the target EDS. More importantly, the transferability of heterogeneous deep neural networks and heterogeneous experience replay buffers is particularly verified. Simulation results show that the proposed framework provides a 71.01 % acceleration in convergence speed and a 7.30 % improvement in fuel economy. This article contributes to correlating different optimization tasks of FCBs through advanced artificial intelligence technologies. © 2025

关键词： Deep reinforcement learning

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Amorphous Quantum Dots Co-Catalyst: Defect Level Induced Solar-to-Hydrogen Production

SSRN

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SSRN 2022年

作者： Guo, Shuangyong Ji, Yujin Li, Youyong Li, Hui An, Pengfei Zhang, Jing Yan, Junqing Liu, Shengzhong Ma, Tianyi Key Laboratory of Applied Surface and Colloid Chemistry Ministry of Education Shaanxi Engineering Lab for Advanced Energy Technology School of Materials Science and Engineering Shaanxi Normal University Xi’an710119 China Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices Soochow University Jiangsu Suzhou215123 China Institute of Clean Energy Chemistry Centre for Translational Atomaterials Australia Beijing Synchrotron Radiation Facility Institute of High Energy Physics Chinese Academy of Sciences Beijing100049 China

Photocatalytic water splitting has been regarded as the most economical means for the production of green hydrogen. However, the conversion efficiency of photocatalytic water splitting is still low. Herein, a uniform dispersion of amorphous and nanosized CuOx species is in-situ loaded on the surface of TiO2 to form am-CuOx/TiO2, representing the first-of-its-kind amorphous quantum dots as the co-catalysts for photocatalytic process. Their CuOx particles anchor on the surface of TiO2 via bondings between the surface Ti and Cu as confirmed by X-ray absorption spectroscopy measurements. Notably, ultraviolet photoelectron spectroscopy coupled with density functional theory calculations indicates that the defect energy levels of CuOx act as the collection centers of the electrons photogenerated by TiO2. Therefore, the am-CuOx/TiO2 catalyst exhibits photocatalytic H2 evolution rate of 19.14 μmol/h under LED-365 illumination with the record-breaking AQE value of 52.29%. This work will enable the design of more efficient photocatalytic green H2 evolution. © 2022, The Authors. All rights reserved.

关键词： Titanium dioxide

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Low Temperature Mechanical Behavior of Fine- and Ultrafine-Grained 304 Austenitic Stainless Steel Fabricated by Cryogenic-Rolling and Annealing

SSRN

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SSRN 2022年

作者： Zheng, Chengsi Hu, Lei Zhen, Qiannan Tang, Yang Wang, Yongqiang Li, Na Jiang, Heng Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials Anhui University of Technology Ministry of Education Maanshan243002 China School of Materials Science and Engineering Anhui University of Technology Maanshan243002 China Suzhou Apintec New Material Co. Ltd. Suzhou215000 China School of Metallurgical Engineering Anhui University of Technology Maanshan243002 China National Safety Engineering Technology Research Center for Pressure Vessels and Pipelines Hefei General Machinery Research Institute Co. Ltd. Hefei230031 China

Fine-grained (FG) austenite structure, and ultrafine-grained (UFG) structure consisting of austenite matrix and residual strain-induced α′-martensite (SIMα′ ) were fabricated by combining cryogenic-rolling with annealing for 304 austenitic stainless steel (ASS). Tensile and Charpy V-notch impact tests at 20–298 K were carried out to investigate the low temperature mechanical behavior of FG- and UFG-ASS. We found that FG-ASS showed a better match among strength, plasticity and toughness at 20–298 K. The prevailing cleavage was observed in the fracture surface of UFG-ASS at 77 K and 20 K, resulting from the inhibited SIMα′ transformation and residual SIM α′. Both single serration of FG- and UFG-ASS can be divided into Stage I–IV at 20 K, in which Stage II exhibited two mini work-hardening types of three-stage and continuous-reduction. Stress cliff fall, abrupt increase of strain and instantaneous strain rate were found simultaneously during Stage III. The critical temperature to occur serrated flow increased and the serrated flow intensified with refining grain size, accompanying with that more SIMα′ and more stacking faults were detected in FG- and UFG-ASS, respectively. This paper indicated that there was a strong grain size-dependent interaction between serrated flow and SIMα′ transformation for metastable ASS, which was also in favor of understanding the grain size-dependent serrated flow of other metastable alloys. © 2022, The Authors. All rights reserved.

关键词： Temperature

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Anti-Solvent-Free Preparation for Efficient and Photostable Pure-Iodide Wide-Bandgap Perovskite Solar Cells

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Angewandte Chemie 2024年第17期136卷

作者： Ting Nie Zhimin Fang Tinghuan Yang Prof. Kui Zhao Prof. Jianning Ding Prof. Shengzhong (Frank) Liu Key Laboratory of Applied Surface and Colloid Chemistry Ministry of Education Shaanxi Key Laboratory for Advanced Energy Devices Shaanxi Engineering Lab for Advanced Energy Technology School of Materials Science and Engineering Shaanxi Normal University 710119 Xi'an China Institute of Technology for Carbon Neutralization Yangzhou University 225127 Yangzhou China Dalian National Laboratory for Clean Energy iChEM Dalian Institute of Chemical Physics Chinese Academy of Sciences 116023 Dalian China

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Layer-Dependent Pressure Effect on the Electronic Structure of 2D Black Phosphorus

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Physical Review Letters 2021年第18期127卷 186401-186401页

作者： Shenyang Huang Yang Lu Fanjie Wang Yuchen Lei Chaoyu Song Jiasheng Zhang Qiaoxia Xing Chong Wang Yuangang Xie Lei Mu Guowei Zhang Hao Yan Bin Chen Hugen Yan State Key Laboratory of Surface Physics Key Laboratory of Micro- and Nano-Photonic Structures (Ministry of Education) and Department of Physics Fudan University Shanghai 200433 China Center for High Pressure Science & Technology Advanced Research Shanghai 201203 China Institute of Flexible Electronics Northwestern Polytechnical University Xi’an 710072 China CAS Key Laboratory of Experimental Study under Deep-sea Extreme Conditions Institute of Deep-Sea Science and Engineering Chinese Academy of Sciences Sanya 572000 China Collaborative Innovation Center of Advanced Microstructures Nanjing 210093 China

Through infrared spectroscopy, we systematically study the pressure effect on electronic structures of few-layer black phosphorus (BP) with layer number ranging from 2 to 13. We reveal that the pressure-induced shift of optical transitions exhibits strong layer dependence. In sharp contrast to the bulk counterpart which undergoes a semiconductor to semimetal transition under ∼1.8 GPa, the band gap of 2 L increases with increasing pressure until beyond 2 GPa. Meanwhile, for a sample with a given layer number, the pressure-induced shift also differs for transitions with different indices. Through the tight-binding model in conjunction with a Morse potential for the interlayer coupling, this layer- and transition-index-dependent pressure effect can be fully accounted. Our study paves a way for versatile van der Waals engineering of two-dimensional BP.

关键词： Electronic structure Pressure effects 2-dimensional systems Infrared spectroscopy Raman spectroscopy Tight-binding model

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