Chinese Journal of Catalysis ›› 2016, Vol. 37 ›› Issue (7): 1109-1118.DOI: 10.1016/S1872-2067(16)62454-3

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Influence of counter electrode material during accelerated durability test of non-precious metal electrocatalysts in acidic medium

Jia Lia, Huiyuan Liub, Yang Lüa, Xinwen Guoa, Yujiang Songa   

  1. a. State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, Liaoning, China;
    b. Dalian National Laboratories for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China
  • Received:2016-01-30 Revised:2016-05-07 Online:2016-06-17 Published:2016-06-17
  • Contact: Yujiang Song
  • Supported by:

    This work was supported by the Fundamental Research Funds for the Central Universities (DUT15RC(3)001, DUT15ZD225), the Program for Liaoning Excellent Talents in University (LR2015014), the Liaoning BaiQianWan Talents Program (201519), and Dalian Excellent Young Scientific and Technological Talents (2015R006).

Abstract:

Significant progress has been made in the development of non-precious metal electrocatalysts (NPMEs) during the past decade. Correspondingly, there is an urgent demand for an appropriate measurement method to be established for the reliable evaluation of NPMEs. In this study, platinum and graphite counter electrodes were used to investigate the impact of counter electrode material on the accelerated durability testing (ADT) of NPMEs in acidic medium. Platinum used as the counter electrode in a traditional three-electrode electrochemical cell was found to dissolve in acidic medium and re-deposit on NPME coated on the working electrode during ADT. Such re-deposition causes the oxygen reduction reaction (ORR) performance of NPMEs to remarkably improve, and thus will seriously mislead our judgment of NPMEs if we are unaware of it. The phenomenon can be avoided using a graphite counter electrode.

Key words: Non-precious metal electrocatalyst, Platinum counter electrode, Graphite counter electrode, Accelerated durability test, Acid medium