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Interface modulation of twinned Pt Fe nanoplates branched 3D architecture for oxygen reduction catalysis

Science Bulletin 2020年第2期65卷 97-104,87页

作者： Mingchuan Luo Yingnan Qin Menggang Li Yingjun Sun Chunji Li Yingjie Li Yong Yang Fan Lv Dong Wu Peng Zhou Shaojun Guo Department of Materials Science&Engineering College of EngineeringPeking UniversityBeijing 100871China College of Chemistry and Molecular Engineering Qingdao University of Science and TechnologyQingdao 266042China MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage School of Chemistry and Chemical EngineeringHarbin Institute of TechnologyHarbin 150001China BIC-ESAT College of EngineeringPeking UniversityBeijing 100871China Department of Energy and Resources Engineering College of EngineeringPeking UniversityBeijing 100871China

Highly-branched dendritic Pt-based nanocrystals possess great potential in catalyzing the oxygen reduction reaction(ORR),but encounter performance ceiling due to their poor thermal and electrochemical ***,we present a novel Pt Fe nanodendrites(NDs)branched with two-dimensional(2 D)twinned nanoplates rather than conventional 1 D nanowires,which breaks the ORR performance ceiling of dendritic catalysts by inducing the unique Pt-skin configuration via rationally thermal *** further hybridizing the Pt-skin Pt Fe NDs/C with amino-functionalized ionic liquids(ILs),we achieve an unprecedented mass activity of 3.15 A/mgPtat 0.9 V versus reversible hydrogen electrode(RHE)in the Pt Fe-based ORR electrocatalytic *** also show excellent electrocatalytic durability for ORR with negligible activity decay and no apparent structural change after 20,000 cycles,in sharp contrast to the nanowires branched Pt Fe NDs *** remarkable catalytic performance is attributed to a combination of several structural features,including 2 D morphology,twin boundary,partially ordered phase and strong coordination with amino *** work highlights the significance of stabilizing electrocatalytic structures via morphology tuning,which thus enables further surface and interface modification for performance breakthrough in ORR electrocatalysis.

关键词： Oxygen reduction reaction PtFe alloy dendrities Nanoplates Ionic liquid

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