钌基镧系金属氧化物用于电催化酸性析氧反应

Ru-Based Lanthanide Metal Oxide is Used for Electrocatalytic Acid Oxygen Evolution

二氧化钌(RuO_(2))是质子交换膜水电解槽中用作负极材料的基准电催化剂之一。然而,RuO_(2)在析氧反应(OER)中容易发生金属溶解现象,从而影响了其长期稳定性。此外,最近报道的Ru基电催化剂的稳定性依旧不是很理想,可能忽略了催化剂热力学稳定性差的问题。报道了一种异质结构Ru基镧系氧化物(Ru/Sm_(2)O_(3)@CNT;CNT=碳纳米管)催化剂,镧系金属氧化物的存在极大地增强了Ru基电催化剂的长时间稳定性。实验结果表明,Ru/Sm_(2)O_(3)@CNT在酸性OER中表现出最佳的过电位和稳定性。其在10 mA·cm^(-2)的电流密度下的过电位低至286 mV,优于先前报道的Ru基电催化剂。此外,在10 mA·cm^(-2)的电流密度下,它在20 h的稳定性测试中保持了出色的催化活性。

Ruthenium dioxide(RuO_(2))is one of the benchmark electrocatalysts used as an anode material in proton exchange membrane water electrolyser.However,RuO_(2)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/Sm_(2)O_(3)@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/Sm_(2)O_(3)@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.