Highly Selective TiN-Supported Highly Dispersed Pt Catalyst: Ultra Active toward Hydrogen Oxidation and Inactive toward Oxygen Reduction

ACS Applied Materials & Interfaces
Junming LuoShijun Liao

Abstract

The severe dissolution of the cathode catalyst, caused by an undesired oxygen reduction reaction at the anode during startup and shutdown, is a fatal challenge to practical applications of polymer electrolyte membrane fuel cells. To address this important issue, according to the distinct structure-sensitivity between the σ-type bond in H2 and the π-type bond in O2, we design a HD-Pt/TiN material by highly dispersing Pt on the TiN surface to inhibit the unwanted oxygen reduction reaction. The highly dispersed Pt/TiN catalyst exhibits excellent selectivity toward hydrogen oxidation and oxygen reduction reactions. With a Pt loading of 0.88 wt %, our catalyst shows excellent hydrogen oxidation reaction activity, close to that of commercial 20 wt % Pt/C catalyst, and much lower oxygen reduction reaction activity than the commercial 20 wt % Pt/C catalyst. The lack of well-ordered Pt facets is responsible for the excellent selectivity of the HD-Pt/TiN materials toward hydrogen oxidation and oxygen reduction reactions. Our work provides a new and cost-effective solution to design selective catalysts toward hydrogen oxidation and oxygen reduction reactions, making the strategy of using oxygen-tolerant anode catalyst to improve the stabi...Continue Reading

References

Jan 16, 2007·Science·Vojislav R StamenkovicNenad M Marković
Sep 14, 2007·Chemical Reviews·Rod BorupNorio Iwashita
Jul 23, 2011·Nature Chemistry·Botao QiaoTao Zhang
Jul 10, 2012·Physical Chemistry Chemical Physics : PCCP·Ren-Qin ZhangAloysius Soon
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Jul 3, 2013·Accounts of Chemical Research·Xiao-Feng YangTao Zhang
Oct 5, 2013·Journal of the American Chemical Society·Jian LinTao Zhang

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