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Alternative Strategy for Development of Dielectric Calcium Copper Titanate‑Based Electrolytes for Low‑Temperature Solid Oxide fuel cells

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Nano-Micro Letters 2025年第1期17卷 310-332页

作者： Sajid Rauf Muhammad Bilal Hanif Zuhra Tayyab Matej Veis MAKYousaf Shah Naveed Mushtaq Dmitry Medvedev Yibin Tian Chen Xia Martin Motola Bin Zhu College of Mechatronics and Control engineering Shenzhen UniversityShenzhen 518060People’s Republic of China Department of Inorganic Chemistry Faculty of Natural SciencesComenius University BratislavaIlkovicova684215 BratislavaSlovakia Energy Storage Joint research center School of Energy and EnvironmentSoutheast UniversityNanjing 210096People’s Republic of China hydrogen Energy Laboratory Ural Federal University620002 EkaterinburgRussia Laboratory of Electrochemical Devices Based on Solid Oxide Proton Electrolytes Institute of High Temperature Electrochemistry620066 EkaterinburgRussia School of Microelectronics Hubei UniversityWuhan 430062People’s Republic of China

The development of low-temperature solid oxide fuel cells(LT-SOFCs)is of significant importance for realizing the widespread application of *** has stimulated a substantial materials research effort in developing high oxide-ion conductivity in the electrolyte layer of *** this context,for the first time,a dielectric material,CaCu_(3)Ti_(4)O_(12)(CCTO)is designed for LT-SOFCs electrolyte application in this *** individual CCTO and its heterostructure materials with a p-type Ni_(0.8)Co_(0.15)Al_(0.05)LiO_(2−δ)(NCAL)semiconductor are evaluated as alternative electrolytes in LT-SOFC at 450–550℃.The single cell with the individual CCTO electrolyte exhibits a power output of approximately 263 mW cm^(-2) and an open-circuit voltage(OCV)of 0.95 V at 550℃,while the cell with the CCTO–NCAL heterostructure electrolyte capably delivers an improved power output of approximately 605 mW cm^(-2) along with a higher OCV over 1.0 V,which indicates the introduction of high hole-conducting NCAL into the CCTO could enhance the cell performance rather than inducing any potential short-circuiting *** is found that these promising outcomes are due to the interplay of the dielectric material,its structure,and overall properties that led to improve electrochemical mechanism in CCTO–***,density functional theory calculations provide the detailed information about the electronic and structural properties of the CCTO and NCAL and their heterostructure CCTO–*** study thus provides a new approach for developing new advanced electrolytes for LT-SOFCs.

关键词： LT-SOFCs Dielectric CaCu_(3)Ti_(4)O_(12) Semiconductor Ni_(0.8)Co_(0.15)Al_(0.05)LiO_(2−δ) Ionic conductivity Heterostructure electrolyte

Lattice Boltzmann simulation study of anode degradation in solid oxide fuel cells during the initial aging process

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International Journal of Minerals,Metallurgy and Materials 2024年第2期31卷 405-411页

作者： Shixue Liu Zhijing Liu Shuxing Zhang Hao Wu hydrogen Energy Industrial Technology Innovation center China Nuclear Power Technology Research InstituteShenzhen 518031China Shenzhen engineering research center for hydrogen Safety Shenzhen 518031China

For present solid oxide fuel cells(SOFCs),rapid performance degradation is observed in the initial aging process,and the dis-cussion of the degradation mechanism necessitates quantitative ***,focused ion beam-scanning electron microscopy was em-ployed to characterize and reconstruct the ceramic microstructures of SOFC *** lattice Boltzmann method(LBM)simulation of multiphysical and electrochemical processes in the reconstructed models was *** samples collected from industrial-size cells were characterized,including a reduced reference cell and a cell with an initial aging *** parameters of the reconstructed microstructures revealed a significant decrease in the active triple-phase boundary and Ni connectivity in the aged cell compared with the reference *** LBM simulation revealed that activity degradation is dominant compared with microstructural degradation during the initial aging process,and the electrochemical reactions spread to the support layer in the aged *** microstructural and activity de-gradations are attributed to Ni migration and coarsening.

关键词： solid oxide fuel cell anode degradation focused ion beam-scanning electron microscopy lattice Boltzmann method

Synthesis, characterization and electrocatalytic studies of palladium–manganese oxyhydroxide nanocomposite towards direct ethylene glycol fuel cell

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Chinese Science Bulletin 2014年第27期59卷 3413-3419页

作者： Ramanujam Kannan Ae Rhan Kim Dong Jin Yoo R&D Education center for Specialized Graduate School of hydrogen and fuel cells engineering Chonbuk National University Chonju Joellabuk-do 561-756 Korea Department of Energy Storage/Conversion engineering Hydrogen and Fuel Cell Research Center Graduate SchoolChonbuk National University Chonju Joellabuk-do 561-756Korea Department of Chemistry Chonbuk National UniversityChonju Joellabuk-do 561-756 Korea

The palladium nanoparticle grafted manganese oxyhydroxide nanorod(MON) electrocatalyst has been synthesized and tested for the electrooxidation of ethylene glycol(EG) in an alkaline medium. The MON was prepared using the hydrothermal method and the Pd nanoparticles were coated on the MON using an in situ reduction method. The nanocatalyst thus prepared was characterized by powder X-ray diffraction, scanning electron microscopy, high resolution transmission electron microscopy, energy dispersive X-ray spectroscopy and electrochemical methods. The microscopic studies confirm the formation of MON and reveal that the Pd nanoparticles were grafted uniformly on the MON. In the voltammetric studies, the Pd/MON catalyst exhibited a six-fold improved peak current for ethylene glycol electrooxidation compared with the C/Pd. The EG electrooxidation reaction performances of the Pd/MON nanocatalyst in the alkaline solutions containing different quantities of EG were tested through cyclic voltammetry. The catalytic removal of the poisonous intermediates formed during electrooxidation of EG was explained. The present study shows that MON can act as an active support for the Pd nanocatalyst.

关键词：钯纳米粒子氢氧化锰乙二醇化学研究燃料电池纳米复合合成高分辨透射电子显微镜

Highly Active Electrocatalyst Derived from ZIF-8 Decorated with Iron(III) and Cobalt(III) Porphyrin Toward Efficient Oxygen Reduction in Both Alkaline and Acidic Media

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Chemical research in Chinese Universities 2022年第4期38卷 961-967页

作者： ZHENG Ruonan ZHAI Zihui QIU Chenxi GAO Rui LV Yang SONG Yujiang State Key Laboratory of Fine Chemicals&Dalian Key Laboratory of Core Materials and Units for hydrogen Energy and fuel cells School of Chemical EngineeringDalian University of TechnologyDalian116024P.R.China

Zeolite imidazole frameworks 8(ZIF-8)and modified ones after pyrolysis are highly promising toward oxygen reduction reaction(ORR).Especially,the compositional modification of ZIF-8 is crucial to the enhancement of ORR performance,yet limited to the substitution of skeletal Zn(II)with other cations or simple physical adsorption of ***,we report the decoration of ZIF-8 with ORR active hemin(FeP)and Co(III)protoporphyrin(CoP)via the coordination between the peripheral carboxylic group of FeP and CoP with skeletal Zn(II).This allows well control over the quantity of loaded FeP and CoP,critical to the synthesis of advanced *** pyrolysis of FeP and CoP co-decorated ZIF-8 leads to highly active ORR electrocatalysts with a half-wave potential(E1/2)of 0.913 V(***)in 0.1 mol/L KOH *** an E1/2 of 0.803 V(***)in 0.1 mol/L HClO4 ***,our electrocatalyst shows much more improved and comparable durability in alkaline and acidic media,respectively,during 3000 cycles of cyclic voltammetry(CV)scanning relative to commercial Pt/C.

关键词： Non-noble metal electrocatalyst ZIF-8 Porphyrin Oxygen reduction reaction(ORR)

Practical operating flexibility of a bifunctional freestanding membrane for efficient anion exchange membrane water electrolysis across all current ranges

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Carbon Energy 2024年第9期6卷 306-324页

作者： Hong-Jin Son Jeemin Hwang Min Young Choi Seung Hee Park Jae Hyuk Jang Byungchan Han Sung Hoon Ahn Department of Bio-Chemical engineering Chosun UniversityGwangjuRepublic of Korea fuel Cell research and Demonstration center Hydrogen Energy Research DivisionKorea Institute of Energy Research(KIER)Buan-gunJeollabuk-doRepublic of Korea Department of Chemical and Biomolecular engineering Yonsei UniversitySeoulRepublic of Korea center for research Equipment Korea Basic Science InstituteDaejeonRepublic of Korea

This study explores a symmetric configuration approach in anion exchange membrane(AEM)water electrolysis,focusing on overcoming adaptability challenges in dynamic ***,a rapid and mild synthesis technique for fabricating fibrous membrane-type catalyst electrodes is *** method leverages the contrasting oxidation states between the sulfur-doped NiFe(OH)_(2) shell and the metallic Ni core,as revealed by electron energy loss *** evaluations confirm that the S–NiFe(OH)_(2) active sites optimize free energy for alkaline water electrolysis *** technique bypasses traditional energy-intensive processes,achieving superior bifunctional activity beyond current *** symmetric AEM water electrolyzer demonstrates a current density of 2 A cm^(-2) at 1.78 V at 60℃ in 1 M KOH electrolyte and also sustains ampere-scale water electrolysis below 2.0 V for 140 h even in ambient *** results highlight the system's operational flexibility and structural stability,marking a significant advance-ment in AEM water electrolysis technology.

关键词： AEM water electrolysis fibrous membrane iR correction free operational stability symmetric configuration

Degradation of Silicone Rubbers in Fenton's Reagents

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Journal of Wuhan University of Technology(Materials Science) 2018年第4期33卷 793-796页

作者：吴凡李克 ZHANG Qinglian ZHANG Haining CHEN Yanan PAN Mu YAN Xinping State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology National engineering research center for Waterway Transport Safety Intelligent Transport Systems research center Wuhan University of Technology Hubei Key Laboratory of fuel cells Wuhan University of Technology

Gaskets are applied in PEMFCs（proton exchange membrane fuel cells） to keep reactant gases and liquid within their respective regions, which are of great significance for the both sealing and electrochemical performance of fuel cells during the long-term operation. In this study, the degradation of silicone rubbers, often selected as seals in PEMFCs, in Fenton＇s reagents with different H_2O_2 concentrations was investigated. The changes in chemical properties, mechanical behavior and surface morphology of the samples were studied before and after exposure to the test environment over time. It is found that increasing H_2O_2 concentration will degrade the rubbers more severely. The experimental results elucidate the degradation mechanism of silicone rubbers in Fenton＇s reagents and the influence of H_2O_2 in the degradation process.

关键词： silicone rubbers PEMFCs seal degradation Fenton's reagents

Ti_(4)O_(7) supported IrO_(x) for anode reversal tolerance in proton exchange membrane fuel cell

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Frontiers in Energy 2022年第5期16卷 852-861页

作者： Yonghuan LI Wei SONG Guang JIANG Yue YANG Hongmei YU Zhigang SHAO Fangwei DUAN Yingxuan YANG fuel Cell System and engineering Laboratory Key Laboratory of Fuel Cells and Hybrid Power SourcesDalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China University of the Chinese Academy of Sciences Beijing 100039China State Grid Liaoning Electric Power research Institute Shenyang 110055China

fuel starvation can occur and cause damage to the cell when proton exchange membrane fuel cells operate under complex working *** this case,carbon corrosion *** evolution reaction(OER)catalysts can alleviate carbon corrosion by introducing water electrolysis at a lower potential at the anode in fuel *** mixture of hydrogen oxidation reaction(HOR)and unsupported OER catalyst not only reduces the electrolysis efficiency,but also influences the initial performance of the fuel ***,Ti_(4)O_(7) supported IrO_(x) is synthesized by utilizing the surfactant-assistant method and serves as reversal tolerant components in the *** the cell reverse time is less than 100 min,the cell voltage of the MEA added with IrO_(x)/Ti_(4)O_(7) has almost no ***,the MEA has a longer reversal time(530 min)than IrO_(x)(75 min),showing an excellent reversal *** results of electron microscopy spectroscopy show that IrO_(x) particles have a good dispersity on the surface of Ti_(4)O_(7) and IrO_(x)/Ti_(4)O_(7) particles are uniformly dispersed on the anode catalytic *** the stability test,the Ti_(4)O_(7) support has little decay,demonstrating a high electrochemical ***_(x)/Ti_(4)O_(7) with a high dispersity has a great potential to the application on the reversal tolerance anode of the fuel cell.

关键词： proton exchange membrane fuel cell(PEMFC) fuel starvation cell reverse reversal tolerance anode oxygen evolution reaction

Electrochemical Properties of Tubular SOFC Based on a Porous Ceramic Support Fabricated by Phase-Inversion Method

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Journal of Materials Science & Technology 2016年第7期32卷 681-686页

作者： Zongying Han Yuhao Wang Zhibin Yang Minfang Han Union research center of fuel Cell School of Chemical and Environmental Engineering China University of Mining and Technology State Key Laboratory of Power Systems Department of Thermal Engineering Tsinghua University

In this work, a tubular ceramic-supported solid oxide fuel cell （SOFC） was successfully fabricated by a low cost and simple process involving phase-inversion, brush coating and co-sintering. Properties in- cluding sintering behavior, microstructure of the tubular support as well as the electrochemical properties of single cell were investigated. The results show that a porous tubular support with finger-like pores and macrovoids was obtained after phase-inversion process. The tubular support is proved to be gaspermeable after sintering at 1400 ℃ with shrinkage of about 34%. The maximum power density of single tubular SOFC is 100 mW/cm2 and 122 mW/cm2 at 850 ℃ when fed with wet methane and hydrogen, respectively. The current collection, thickness of electrolyte and gas permeability of tubular support should account for the large total resistance. The present tubular design could be expected to deliver a higher voltage for longer support with several segmented-in-series cell stacks.

关键词： Phase-inversion method Ceramic support Tubular solid oxide fuel cell Segmented-in-series

Cell-protecting regeneration from anode carbon deposition using in situ produced oxygen and steam:A combined experimental and theoretical study

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Journal of Materials Science & Technology 2018年第12期34卷 2375-2383页

作者： Zongying Han Zhibin Yang Minfang Han Union research center of fuel Cell School of Chemical and Environmental EngineeringChina University of Mining and Technology Department of Energy and Power engineering Tsinghua University College of Chemical and Environmental engineering Shandong University of Science and Technology

Carbon deposition is a primary concern during the operation of solid oxide fuel cells（SOFCs） fueled with hydrocarbon fuels, leading to cell degradation and even cell damage. Carbon elimination is expected to be a promising approach to prolong cell life. This work reports on a combined experimental and theoretical investigation of cell regeneration from anode carbon deposition of tubular SOFCs fabricated by phase-inversion and co-sintering techniques. The as-prepared cell exhibits a maximum power density of 0.20 W cm;at 800 ℃ fueling with wet CH;, but fails to stable operation due to severe carbon *** on thermodynamic predictions, a successive cell-protecting regeneration process is proposed to eliminate deposited carbon without oxidizing Ni catalysts, during which CH;and H;fuels are provided in circulation. Through a total of 35 cycling tests, cell performance can always successfully restore to the initial *** possible carbon elimination mechanism is investigated in detail based on thermodynamic and first-principle calculations. The feasibility of carbon elimination using in situ produced oxygen or steam through electrochemical reaction has been revealed, providing a novel continuous operation mode for hydrocarbon-based SOFCs.

关键词： Solid oxide fuel cells Carbon deposition Cell regeneration Carbon elimination First-principle