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Engineering local coordination environments and site densities for high-performance Fe-N-C oxygen reduction reaction electrocatalysis

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SmartMat 2021年第2期2卷 154-175页

作者： Qing Wang Lu Shang Dongxiao Sun-Waterhouse Tierui Zhang Geoffrey Waterhouse School of Chemical Sciences The University of AucklandAucklandNew Zealand Key Laboratory of Photochemical conversion and Optoelectronic Materials Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijingChina

Fe-N-C catalysts represent very promising cathode catalysts for polymer electrolyte fuel cells,owing to their outstanding activity for the oxygen reduction reaction(ORR),especially in alkaline *** this review,we summarize recent advances in the design and synthesis of Fe-N-C catalysts rich in highly dispersed FeNx active *** emphasis is placed on emerging strategies for tuning the electronic structure of the Fe atoms to enhance the ORR activity,and also maximizing the surface concentration of FeNx sites that are catalytically accessible during *** great progress has been made over the past 5 years in the development of Fe-N-C catalyst for ORR,significant technical obstacles still need to be overcome to enable the large-scale application of Fe-N-C materials as cathode catalysts in real-world fuel cells.

关键词： Fe-N-C local coordination environment oxygen reduction reaction site density

“On-off”switch for H_(2)and O_(2)generation from HCOOH resp.H_(2)O_(2)

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Carbon Energy 2023年第3期5卷 75-86页

作者： Wenkai Huang Fuhua Xu Dong‐Sheng Li Didier Astruc Xiang Liu Key Laboratory of Inorganic Nonmetallic Crystalline and Energy conversion Materials College of Materials and Chemical EngineeringChina Three Gorges UniversityYichangHubeiChina ISM UMR CNRS N°5255Universitéde BordeauxTalence CedexFrance

In spite of the numerous advances in the development of H_(2)and O_(2)evolutions upon water splitting,the separation of H_(2)from O_(2)still remains a severe ***,the novel dual-functional nanocatalysts Pd/carbon nanosphere(CNS),obtained via immobilization of ultrafine Pd nanoparticles onto CNS,are developed and employed for both selective H_(2)generation from HCOOH dehydrogenation and O_(2)evolution from H_(2)O_(2)*** these reactions,the highest activities for Pd/CNS-800(i.e.,calcinated at 800℃)are 2478 h−1 and 993 min^(−1)for H_(2)and O_(2)evolution,*** highly efficient and selective“on-off”switch for selective H_(2)generation from HCOOH is successfully realized by pH *** novel and highly efficient nanocatalyst Pd/CNS-800 not only provides new approaches for the promising application of HCOOH and H_(2)O_(2)as economic and safe H_(2)and O_(2)carriers,respectively,for fuel cells,but also promotes the development of“on-off”switch for on-demand H_(2)evolution.

关键词： carbon nanospheres H_(2)generation O_(2)evolution “on-off”switch Pd nanoparticles

Enhancing cathode performance for CO2 electrolysis with Ce0.9M0.1O2-δ（M=Fe, Co, Ni） catalysts in solid oxide electrolysis cell

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Journal of Energy Chemistry 2020年第1期29卷 46-51,I0003页

作者： Zhidong Huang Zhe Zhao Huiying Qi Xiuling Wang Baofeng Tu Mojie Cheng Division of fuel Cells Dalian National Laboratory for Clean EnergyDalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina University of Chinese Academy of Sciences Beijing 100049China

Electrochemical conversion with solid oxide electrolysis cells is a promising technology for CO2 utilization and simultaneously store renewable *** this work,Ce0.9M0.1O2-δ(CeM,M=Fe,Co,Ni)catalysts are infiltrated into La0.6Sr0.4Cr0.5Fe0.5O3-δ-Gd0.2Ce0.8O2-δ(LSCr Fe-GDC)cathode to enhance the electrochemical performance for CO2 ***-LSCrFe-GDC cell obtains the best performance with a current density of 0.652 A cm^-2,followed by CeFe-LSCrFe-GDC and CeNi-LSCrFe-GDC cells with the value of 0.603 and 0.535 A cm^-2,respectively,about 2.44,2.26 and 2.01 times higher than that of the LSCrFe-GDC cell at1.5 V and 800℃.Electrochemical impedance spectra combined with distributions of relaxed times analysis shows that both CO2 adsorption process and the dissociation of CO2 at triple phase boundaries are accelerated by Ce M catalysts,while the latter is the key rate-determining step.

关键词： Solid oxide electrolysis cell Carbon dioxide conversion Doped ceria Distribution of relaxation times Electroreduction

Electrochemical impedance spectroscopy of PEM fuel cells at low hydrogen partial pressures: efficient cell tests for mass production

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Industrial Chemistry & Materials

Industrial Chemistry & Materials 2024年第1期2卷 132-140页

作者： Felix Haimerl Sunil Kumar Michael Heere Aliaksandr S.Bandarenka Technical University of Munich School of Natural SciencesDepartment of PhysicsProfessorship of Physics of Energy Conversion and Storage85748 GarchingGermany BMW AG Petuelring 13080809 MunchenGermany Technical University Braunschweig Faculty of Mechanical EngineeringInstitute of Internal Combustion Engines and Fuel Cells38108 BraunschweigGermany Technical University of Munich Catalysis Research Center TUMErnst-OttoFischer-Straße 185748 GarchingGermany

Quality testing costs hinder the large-scale production of PEM fuel cell systems due to long testing times and high safety measures for *** eliminating both issues,electrochemical impedance spectroscopy at low hydrogen concentrations can provide valuable insights into fuel cell ***,the influence of high anode stream dilutions on PEM fuel cell performance is not yet completely *** study presents a new equivalent circuit model to analyze impedance spectra at low hydrogen partial *** proposed model accurately describes the impedance response and explains the performance decrease at low hydrogen ***,the reduced availability of hydrogen at the anode leads to rising reaction losses from the hydrogen ***,the resulting losses lead to potential changes also influencing the cathode *** findings indicate that impedance spectroscopy at low hydrogen partial pressure might provide a reliable fuel cell quality control tool,simplifying production processes,reducing costs,and mitigating risks in fuel cell production.

关键词： PEM fuel cells Electrochemical impedance spectroscopy EIS Large scale PEMFC production Anodes Cathodes

Substitute of Expensive Pt with Improved Electrocatalytic Performance and Higher Resistance to CO Poisoning for Methanol Oxidation: the Case of Synergistic Pt-Co_3O_4 Nanocomposite

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Nano-Micro Letters 2013年第4期5卷 296-302页

作者： Hongxiao Zhao Zhi Zheng Jing Li Huimin Jia Ka-wai Wong Yidong Zhang Woon Ming Lau Key Laboratory of Micro-Nano Materials for Energy Storage and conversion of Henan Province Institute of Surface Micro and Nano Materials Xuchang University Chengdu Green Energy and Green Manufacturing R&D Center

In this paper, Pt-Co_3O_4 nanocomposite was synthesized by a sol gel process combined with electrodeposition method. Its electrocatalytic activity towards methanol oxidation was investigated at room temperature using cyclic voltammetry(CV), electrochemical impedance spectroscopy(EIS) and current density time curve. It is found that the resultant Pt-Co_3O_4 catalysts with minute amount of Pt exhibite attractive electrocatalytic activity for methanol oxidation reaction(MOR) but with a high resistance CO poisoning due to the synergistic effects from Pt and Co_3O_4. Together with the low manufacturing cost of Co_3O_4, the reported nanostructured Pt-Co_3O_4 catalyst is expected to be a promising electrode material for direct methanol fuel cells(DMFC).

关键词： Pt-Co3O4 nanocomposite MOR Electrocatalytic activity

Tailored Sr-Co-free perovskite oxide as an air electrode for high-performance reversible solid oxide cells

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Science China Materials 2021年第7期64卷 1621-1631页

作者： Wenjie Wang Yunfeng Tian Yun Liu Nalluri Abhishek Yitong Li Bo Chi Jian Pu Center for fuel Cell Innovation School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China China-EU Institute for Clean and Renewable Energy Huazhong University of Science and TechnologyWuhan 430074China Key Laboratory of Material Chemistry for Energy conversion and Storage of Ministry of Education Huazhong University of Science and TechnologyWuhan 430074China

Sr-Co containing perovskite oxides are prospective air electrode candidates for reversible solid oxide cells(RSOCs).However,their efficiencies are limited by Sr segregation and the high thermal expansion coefficient(TEC)of Cobased ***,La_(0.6)Ca_(0.4)Fe_(0.8)Ni_(0.2)O_(3-δ)(LCa FN)is tailored as an Sr-Co-free perovskite air electrode for highperformance *** with La_(0.6)Sr_(0.4)Fe_(0.8)Ni_(0.2)O_(3-δ)(LSFN)and La_(0.6)Sr_(0.4)Co_(0.2)Fe_(0.8)O_(3-δ)(LSCo F),LCa FN has a high electrical conductivity (297 S cm^(-1)),TEC compatibility(11.2×10^(-6)K^(-1)) and improved chemical ***,LCa FN has high oxygen reduction reaction(ORR)activity with a low polarization resistance(0.06Ωcm^(2)) at 800℃.A single-cell NiYSZ/YSZ/gadolinium-doped ceria(GDC)/LCa FN-GDC operated at 800℃ yields a maximum power density of 1.08 W cm^(-2) using H_(2) as *** the solid oxide electrolysis cell(SOEC)mode,the cell can achieve a current density of approximately 1.2 A cm^(-2) at 1.3 V with 70% humidity at 800℃.The cell exhibits good reversibility and remains stable in continuous SOEC and solid oxide fuel cell(SOFC)*** findings indicate the potential application of LCa FN as an air electrode material for RSOCs.

关键词： reversible solid oxide cell Sr-Co-free composite oxide hydrogen production reversibility

Experimental study on variable load regulation of circulating fluidized bed with high temperature preheated activated fuel

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Particuology 2024年第12期95卷 178-188页

作者： Weijian Song Zihua Tang Guoliang Song Jianguo Zhu Jingzhang Liu Haiyang Wang Yinjiang Zhang State Key Laboratory of Coal conversion Institute of Engineering ThermophysicsChinese Academy of SciencesBeijing100190China University of Chinese Academy of Sciences Beijing100049China Datong Institute of Coal Clean and Efficient Utilization Datong037000China

The circulating fluidized bed(CFB)boiler is an essential option,serving as a flexible power ***,it is notable that CFB boilers exhibit noticeable limitations in rapid load *** study delved into the impact of fuel characteristics on CFB load change rate,combustion efficiency,and original NOx emissions using a 2 MW CFB experimental *** findings revealed that blending pulverized coal or modified fuel positively influenced the improvement of CFB load change rate,with blending modified fuel showing a more significant *** the modified fuel and pulverized coal increased the load change rate within the 50%–100%range by 164.4%and 57.3%,***,blending pulverized coal and modified fuel significantly reduced NOx emissions,although there remained room for improvement in combustion *** to conventional combustion,blending pulverized coal and blending modified fuel decreased NOx emissions by 35.9%and 41.4%at 100%load,respectively.

关键词： Circulating fluidized bed Pulverized coal Modified char Coal gas Load change rate NOx emission

Tunable Thermal Rectification and Negative Differential Thermal Resistance in Gas-Filled Nanostructure with Mechanically-Controllable Nanopillars

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Journal of Thermal Science 2022年第4期31卷 1084-1093页

作者： LI Fan LI Haiyang WANG Jun XIA Guodong HWANG Gisuk MOE Key Laboratory of Enhanced Heat Transfer and Energy Conservation Beijing Key Laboratory of Heat Transfer and Energy ConversionBeijing University of TechnologyBeijing 100124China Department of Mechanical Engineering Wichita State University Wichita KS 67260USA

In this study,by using the nonequilibrium molecular dynamics and the kinetic theory,we examine the tailored nanoscale thermal transport via a gas-filled nanogap structure with mechanically-controllable nanopillars in one surface only,i.e.,changing nanopillar *** is found that both the thermal rectification and negative differential thermal resistance(NDTR)effects can be substantially enhanced by controlling the nanopillar *** maximum thermal rectification ratio can reach 340%and the△T range with NDTR can be significantly enlarged,which can be attributed to the tailored asymmetric thermal resistance via controlled adsorption in height-changing nanopillars,especially at a large temperature *** tunable thermal rectification and NDTR mechanisms provide insights for the design of thermal management systems.

关键词： thermal rectification negative differential thermal resistance kinetic theory nanopillars

Gasification kinetic studies of low volatile weakly caking coal

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International Journal of Coal Science & Technology 2023年第2期10卷 159-168页

作者： Akanksha Mishra Shalini Gautam Tripurari Sharma Department of Mechanical Engineering Sharda School of Engineering and TechnologySharda UniversityG.NoidaIndia Department of fuel Minerals and Metallurgical EngineeringIndian Institute of Technology(ISM)DhanbadIndia

Present investigation focuses on the fractional conversion of low volatile weakly caking coal(LVWC)under the standard set of operating conditions for *** this purpose,samples of LVWC of different ash content have been collected from Kusunda Area of Bharat Coking Coal *** results were validated using Homogenous and Shrinking Core kinetic models and the suitability of selected samples for gasification was assessed by estimating the activation *** values of activation energy for LVWC samples were obtained in the range of 25.17-44.09 kJ/***,empirical models were developed to correlate the response of interest with the input variables(temperature,residence time and CO_(2) flow rate).The significance of these developed empirical models was checked using analysis of variance(ANOVA).

关键词： LVWC Gasification CO_(2) Activation energy