过电位
析氧
材料科学
电催化剂
催化作用
化学工程
电化学
无机化学
电极
物理化学
工程类
生物化学
化学
作者
Changsoo Lee,Kihyun Shin,Young‐Tae Park,Young Hwa Yun,Gisu Doo,Gi Hong Jung,MinJoong Kim,Won‐Chul Cho,Chang Hee Kim,Hyuck Mo Lee,Hyun You Kim,Sechan Lee,Graeme Henkelman,Hyun‐Seok Cho
标识
DOI:10.1002/adfm.202301557
摘要
Abstract The development of highly active and durable Ir‐based electrocatalysts for the acidic oxygen evolution reaction (OER) is challenging because of the corrosive anodic conditions. Herein, IrO x /Zr 2 ON 2 electrocatalyst is demonstrated, employing Zr 2 ON 2 as a support material, to overcome the trade‐off between the activity and stability in the OER. Zr 2 ON 2 is selected due to its excellent electrical conductivity and chemical stability, and the fact that it induces strong interactions with IrO x catalysts. As a result, IrO x /Zr 2 ON 2 electrocatalysts exhibit outstanding OER performances, reaching an overpotential of 255 mV at 10 mA cm −2 and a mass activity of 849 mA mg Ir −1 at 1.55 V (vs the reversible hydrogen electrode). The activity of IrO x /Zr 2 ON 2 is maintained at 10 mA cm −2 for 5 h, while in contrast, IrO x /ZrN and an unsupported IrO x catalyst undergo drastic degradation. Combined experimental X‐ray analyses and theoretical interpretations reveal that the reduced oxidation state of Ir and the extended IrO bond distance in IrO x /Zr 2 ON 2 effectively increase the activity and stability of IrO x by altering reaction pathway from a conventional adsorbate evolution mechanism to a lattice oxygen‐participating mechanism. These results demonstrate that it is possible to effectively reduce the Ir content in OER catalysts through interface engineering without sacrificing the catalytic performance.
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