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A ferric citrate derived Fe-N-C electrocatalyst with stepwise pyrolysis for highly efficient oxygen reduction reaction

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Chinese Chemical Letters 2022年第1期33卷 362-367页

作者： Min Zhang Bolong Yang Ting Yang Yahui Yang Zhonghua Xiang State Key Laboratory of Organic-Inorganic Composites Beijing University of Chemical TechnologyBeijing 100029China College of Chemistry and Chemical Engineering Hunan Normal UniversityChangsha 410081China

Unremitting and intensive researches about efficient non-precious metal electrocatalysts are necessary for large-scale commercial applications of fuel cells,while iron and nitrogen co-doped carbon(Fe-N-C)materials has become one of the most promising electrocatalysts to replace Pt-based noble metal ***,the traditional Fe-doped ZIF with rhomb dodecahedron morphology limits the exposure of active sites and the utilization of atoms,even affecting the performance of the ***,a Fe/N co-doped catalyst with a flower-like morphology was prepared using ferric citrate source along with secondary NH_(3)heat *** optimal catalyst(termed as 4Fe_(citrate)-N-C-3)showed distinguished oxygen reduction reaction(ORR)activity with a half-wave potential of 0.8 and 0.9 V(***)in acid and alkaline media,*** addition,4Fe_(citrate)-N-C-3 maintained more than 80%of original activity even after 50,000 s which is superior to the benchmark Pt/*** strategy of controlling morphology and composition is meaningful for the optimization of non-precious metal electrocatalysts for ORR in fuel cells or metal-air batteries.

关键词： Oxygen reduction reaction non-precious metal electrocatalysts Fuel cell ZIF-8 NH3 activation

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ZIF-derived Co–N–C ORR catalyst with high performance in proton exchange membrane fuel cells

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Progress in Natural Science:Materials International 2020年第6期30卷 855-860页

作者： Ruixiang Wang Pengyang Zhang Yucheng Wang Yuesheng Wang Karim Zaghib Zhiyou Zhou State Key Laboratory of Physical Chemistry of Solid Surfaces Collaborative Innovation Center of Chemistry for Energy Materials College of Chemistry and Chemical Engineering Xiamen University Center of Excellence in Transportation Electrificationand Energy Storage Hydro Québec

metal and nitrogen-doped carbon(M-N-C) materials have been considered as the most promising non-precious metal oxygen reduction(ORR) catalysts to replace expensive Pt catalysts. Due to high Fenton catalytic activity of Fe element and the resulting instability, Co-based N–C(Co–N–C) catalysts without Fenton catalytic activity should be a worthier ORR catalyst being explored. Although the high ORR activity of Co–N–C catalyst has been demonstrated in aqueous half-cell tests, their performance under PEMFC working condition is still far away from that of state-of-the-art Fe–N–C catalysts. In this study, a high-performance Co–N–C catalyst was synthesized by one-step pyrolyzing Co-doped ZIF-8(zeolitic imidazolate framework-8) particles in-situ grown on the highsurface-area KJ600 carbon black with high electronic conductivity. The resulting Co–N–C catalyst exhibited high intrinsic ORR activity, fast mass transfer rate and high electronic conductivity, and thus yielded a remarkable peak power density of 0.92 W cm-2in H2–O2PEMFC, which is comparable to state-of-the-art Fe–N–C *** strategy is helpful to synthesize highly active M-N-C ORR catalysts with improved mass transfer and electric conductivity.

关键词： non-precious metal electrocatalysts Fuel cell Oxygen reduction Co-based catalyst ZIF-8

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