The high stable RuMnSnO _x catalysts for enhanced oxygen evolution reaction and anti-reversal performance

Abstract Proton exchange membrane water electrolyzers (PEMWEs) 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 RuMnSnO _x catalyst exhibits 166 mV overpotentials at 10 mA cm ⁻² for OER while only 1.2% performance loss after 1000 cycles in acid medium. The PEM electrolyzers based on RuMnSnO _x achieves 1.998 V at 2 A cm ⁻² and stably operate over 50 h. The PEMFC peak power density based on Pt/C + RuMnSnO _x catalyst reaches 2.61 W cm ⁻² and the anti-reversal time reaches 143 min.