一种用于PEM水电解制氢的高效负载型锰铱掺杂型催化剂

An Efficient Mn-Ir Doped Supported Catalyst for PEM Water Electrolysis

质子交换膜(proton exchange membrane,PEM)水电解制氢是一种绿色、可持续的氢能制备方法,开发用于阳极析氧反应(oxygen evolution reaction,OER)的、高效经济的电催化剂是实现其大规模商业化应用的关键。通过两步合成法,合成了由不同锰基氧化物作载体的氧化铱催化剂IrO_(x)/Mn_(8)O_(10)C_(l3)、IrO_(x)/β-MnO_(2)和IrO_(x)/α-MnO_(2),铱的质量分数为55%左右。与现有商业IrO_(2)和其他含贵金属的电催化剂相比,合成的氧化铱/锰基氧化物催化剂具有更低的过电位和更高的电流密度。IrO_(x)/β-MnO_(2)在电流密度为10 mA/cm^(2)时过电位仅为228 mV,IrO_(x)/Mn_(8)O_(10)C_(l3)在1.53 V电压下比质量活度达到916.7 A/gIr,析氧反应活性的提升归功于催化剂表面丰富的羟基氧缺陷和IrⅢ物种,丰富的结晶-非晶界面为反应提供了大量活性位点。所提的氧化铱/锰基氧化物为高效经济的酸性OER催化剂的开发提供了新思路。

Proton exchange membrane(PEM)water electrolysis is a green and sustainable method of hydrogen production.The development of efficient and economical electrocatalysts for anodic oxygen evolution reaction(OER)is the key to its large-scale commercialization.Iridium oxide catalysts supported by different manganese based oxide carriers(IrO_(x)/Mn_(8)O_(10)C_(l3),IrO_(x)/β-MnO_(2) and IrO_(x)/α-MnO_(2))were prepared by two-step synthesis method,and the content of iridium is about 55%.Compared with the commercial IrO_(2) and other noble metal containing electrocatalysts,the synthesized catalysts have lower overpotential and higher current density.The overpotential of IrO_(x)/β-MnO_(2) is only 228 mV at the current density of 10 mA/cm^(2).The specific mass activity of IrO_(x)/Mn_(8)O_(10)C_(l3) reaches 916.7 A/gIr at 1.53V.The enhancement of OER activity is attributed to the abundant hydroxyl oxygen defects and IrIII species on the catalyst surface.The rich crystalline-amorphous interface provides a large number of active sites for the reaction.The iridium oxide/manganese based oxide catalysts reported in this paper provide new insights for the development of efficient and economical catalysts for acidic OER.