Surface-modulated palladium-nickel icosahedra as high-performance non-platinum oxygen reduction electrocatalysts

Science Advances
Yonggang FengXiaoqing Huang

Abstract

The search for high-performance non-platinum (Pt) electrocatalysts is the most challenging issue for fuel cell technology. Creating bimetallic non-Pt nanocrystals (NCs) with core/shell structures or alloy features has widely been explored as the most effective way for enhancing their electrochemical properties but still suffered from undesirable performance due to the limited interactions between the different components. By addressing the above issue, we report on a new class of active and stable bimetallic non-Pt electrocatalysts with palladium (Pd) icosahedra as the core and nickel (Ni) decorating the surface toward cathodic oxygen reduction reaction (ORR) under alkaline conditions. The optimized Pd6Ni icosahedra with unique interaction between an icosahedral Pd core and surface Ni yield the highest ORR activity with a mass activity of 0.22 A mgPd-1, which is better than those of the conventional Pd6Ni icosahedra with alloy surfaces or Pd-rich surfaces, and even two times higher than that of the commercial Pt/C (0.11 A mgPt-1), representing one of the best non-Pt electrocatalysts. Simulations reveal that the Pd icosahedra decorated with Ni atoms emerged in the subsurface can weaken the interaction between the adsorbed oxygen...Continue Reading

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Citations

Jul 10, 2019·Nanoscale·Bathinapatla SravaniSubramanyam Sarma L
Jan 18, 2020·Dalton Transactions : an International Journal of Inorganic Chemistry·Chong HuangFuqiang Huang
Jul 8, 2020·Advanced Materials·Taehyun KwonKwangyeol Lee
Jul 16, 2020·Advanced Materials·Hui ChenXiaoxin Zou
May 8, 2021·Chemical Society Reviews·P Prabhu, Jong-Min Lee
Jun 14, 2021·Journal of Colloid and Interface Science·Guojie ChaoTianxi Liu
Sep 15, 2021·Journal of the American Chemical Society·Ming ZhouJiye Fang
Oct 7, 2021·Journal of the American Chemical Society·Yiyao GeHua Zhang

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Methods Mentioned

BETA
transmission electron microscopy
x-ray spectroscopy
x-ray diffraction
x-ray photoelectron spectroscopy
scanning electron microscopy

Software Mentioned

Vienna simulation

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