Ru-Based Lanthanide Metal Oxide is Used for Electrocatalytic Acid Oxygen Evolution
Ruthenium dioxide(RuO2)is one of the benchmark electrocatalysts used as an anode material in proton exchange membrane water electrolyser.However,RuO2 is susceptible to metal dissolution in the oxygen evolution reaction(OER),which affects its long-term stability.In addition,the stability of recently reported Ru-based electrocatalysts remains less than optimal,possibly ignoring the poor thermodynamic stability of the catalysts.In this work,we report a heterostructured Ru-based lanthanide oxide(Ru/Sm2O3@CNT;CNT=carbon nanotube)catalyst,and the presence of lanthanide metal oxides greatly enhances the long-term stability of the Ru-based electrocatalysts.The experimental results showed that Ru/Sm2O3@CNT showed the best overpotential and stability in acidic OER.Its overpotential is as low as 286 mV at a current density of 10 mA·cm-2,which is significantly better than the previously reported Ru-based electrocatalysts.In addition,at a current density of 10 mA·cm-2,it maintains excellent catalytic activity during 20 h of stability testing.
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