Chinese Journal of Catalysis ›› 2016, Vol. 37 ›› Issue (7): 1142-1148.DOI: 10.1016/S1872-2067(15)61064-6

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Carbon supported IrM (M = Fe, Ni, Co) alloy nanoparticles for the catalysis of hydrogen oxidation in acidic and alkaline medium

Jianhua Liao, Wei Ding, Sicheng Tao, Yao Nie, Wei Li, Guangping Wu, Siguo Chen, Li Li, Zidong Wei   

  1. School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, China
  • Received:2016-02-02 Revised:2016-02-23 Online:2016-06-17 Published:2016-06-17
  • Contact: Wei Ding, Zidong Wei
  • Supported by:

    This work was supported by the National Basic Research Program of China (973 Program, 2012CB215500), the National Natural Science Foundation of China (21573029), and the Fundamental Research Funds for the Central Universities (106112015CDJXY220002).

Abstract:

We studied the alloying effect in Ir-based alloys on the catalysis of the hydrogen oxidation reaction (HOR) in both acidic and alkaline medium. IrFe, IrNi and IrCo alloy catalysts with nanoparticle size of <5 nm were obtained by our solvent-vaporization plus hydrogen reduction method. The second metal played an important role in tuning the crystal structure and surface electronic structure of the Ir-based alloy catalyst. Among the IrFe, IrCo and IrNi alloy catalysts, Ni induced a mid-sized contraction of the Ir lattice, and gave the best HOR activity in both acidic and alkaline medium. In acidic medium, the weakening of the Ir-Had interaction caused by the electronic effect of M (M = Fe, Ni, Co) alloying is responsible for the enhancement of HOR activity. The oxophilic effect of the catalytic metal surface, which affects OHad adsorption and desorption and surface Had coverage, has a large impact on the HOR activity in the case of alkaline medium.

Key words: Alloying effect, Hydrogen oxidation reaction, Iridium alloy, Lattice contraction, Fuel cell