Amorphous nickel boride membrane on a platinum-nickel alloy surface for enhanced oxygen reduction reaction.

Author(s) He, D.; Zhang, L.; He, D.; Zhou, G.; Lin, Y.; Deng, Z.; Hong, X.; Wu, Y.; Chen, C.; Li, Y.
Journal Nat Commun
Date Published 2016 Aug 09
Abstract

The low activity of the oxygen reduction reaction in polymer electrolyte membrane fuel cells is a major barrier for electrocatalysis, and hence needs to be optimized. Tuning the surface electronic structure of platinum-based bimetallic alloys, a promising oxygen reduction reaction catalyst, plays a key role in controlling its interaction with reactants, and thus affects the efficiency. Here we report that a dealloying process can be utilized to experimentally fabricate the interface between dealloyed platinum-nickel alloy and amorphous nickel boride membrane. The coating membrane works as an electron acceptor to tune the surface electronic structure of the platinum-nickel catalyst, and this composite catalyst composed of crystalline platinum-nickel covered by amorphous nickel boride achieves a 27-times enhancement in mass activity relative to commercial platinum/carbon at 0.9 V for the oxygen reduction reaction performance. Moreover, this interactional effect between a crystalline surface and amorphous membrane can be readily generalized to facilitate the 3-times higher catalytic activity of commercial platinum/carbon.

DOI 10.1038/ncomms12362
ISSN 2041-1723
Citation He D, Zhang L, He D, Zhou G, Lin Y, Deng Z, et al. Amorphous nickel boride membrane on a platinum-nickel alloy surface for enhanced oxygen reduction reaction. Nat Commun. 2016;7:12362.

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