ZIF-Mg(OH)_2 Dual Template Assisted Self-Confinement of Small PtCo NPs as Promising Oxygen Reduction Reaction in PEM Fuel Cell

Zhenyu Chen; Chao Hao; Bowen YanQiuyan ChenHuiyan FengXiaoqing MaoJianmei CenZhi Qun TianPanagiotis TsiakarasPei Kang Shen

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ZIF-Mg(OH)_2 Dual Template Assisted Self-Confinement of Small PtCo NPs as Promising Oxygen Reduction Reaction in PEM Fuel Cell

机译：ZIF-Mg(OH)_2 Dual Template Assisted Self-Confinement of Small PtCo NPs as Promising Oxygen Reduction Reaction in PEM Fuel Cell

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Traditional calcination usually causes sintering of Pt, which diminishesPt exposure in proton exchange membrane fuel cell (PEMFC) electrodes. In thepresent work, a facile self-confined method for synthesizing highly dispersedPtCo-alloy on Co, N co-doped mesoporous carbon (PCN-MC) is developed viaa dual-template strategy. Owing to the co-confined effect of Zn in the bimetalliczeolite-based imidazolate framework (ZIF) and Mg(OH)_2 template, ultra-fine2.7 nm PtCo-alloy with 2–3 atomic-layer Pt-skin nanoparticles are obtained.By adjusting the Co/Zn feeding-ratio in the bimetallic ZIF at 8/7, the alloyingdegree and nanoparticle size are optimized to achieve an outstanding oxygenreduction reaction activity with a high mass activity (MA) of 0.956 A mgPt?1 in0.1 m HClO_4, about 7.5-fold of that of commercial Pt/C. Furthermore, notabledurability is also achieved with 81% retention of the initial MA after 30k cyclesconducted between 0.6–1.0 V (versus reversible hydrogen electrode). Thesefeatures are also verified by a H_2–Air fuel cell test with an excellent combinationof mass activity, power density, and durability. This strategy provides a feasibleroute for the large-scale synthesis of highly-dispersed PtCo-alloy catalysts.

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来源
《Advanced energy materials》 |2022年第32期|2201600.1-2201600.19|共19页
作者
Zhenyu Chen; Chao Hao; Bowen YanQiuyan ChenHuiyan FengXiaoqing MaoJianmei CenZhi Qun TianPanagiotis TsiakarasPei Kang Shen;
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Laboratory of Alternative Energy Conversion SystemsDepartment of Mechanical EngineeringUniversity of Thessaly1 Sekeri Str., Pedion Areos, Volos 38334, Greece;

School of Chemistry and Chemical EngineeringCollaborative Innovation Center of Sustainable Energy MaterialsSchool of Physical Science and TechnologyGuangxi Key Laboratory of Electrochemical Energy MaterialsKey Laboratory of New Processing Technology for N;

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正文语种英语
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bimetallic ZIFs; dual template; oxygen reduction reaction; PtConanoparticles; self-confinement;

ZIF-Mg(OH)_2 Dual Template Assisted Self-Confinement of Small PtCo NPs as Promising Oxygen Reduction Reaction in PEM Fuel Cell

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