Proton exchange membrane water electrolyzers (PEMWE) has become a promising clean energy technology. The development of highly active and stable Ru-based catalysts with high oxygen evolution reaction (OER) activity is crucial to the practical application of PEMWE because of the rare and high cost Ir. Moreover, the high performance OER catalyst could be used in anode to improve the anti-reversal performance for proton exchange membrane fuel cell (PEMFC). In this work, the RuMnSnOx catalyst exhibits 166 mV overpotentials at 10 mA cm-2 for OER while only 1.2% performance loss after 1,000 cycles in acid medium. The PEM electrolyzers based on RuMnSnOx achieves 1.998 V at 2 A cm-2 and stably operate over 50 hours. The proton exchange membrane fuel cell peak power density based on Pt/C+RuMnSnOx catalyst reaches 2.61 W cm-2 and the anti-reversal time reaches 143 mins.
Zhu et al. (Wed,) studied this question.