Highly Crystalline Iridium–Nickel Nanocages with Subnanopores for Acidic Bifunctional Water Splitting Electrolysis

• DOI: 10.1021/jacs.4c01379
• Publication Date: 2024-03-08T20:11:46Z
• Authors: Hui Ding; Caijie Su; Jiabao Wu; Haifeng Lv; Yi Tan; Xiaolin Tai; Wenjie Wang; Tianpei Zhou; Yue Lin; Wangsheng Chu; Xiaojun Wu; Yi Xie; Changzheng Wu
• Keywords: Nanocages; Oxygen evolution; Electrolysis of water

Developing efficient bifunctional materials is highly desirable for overall proton membrane water splitting. However, the design of iridium with high acidic splitting activity and durability, as well an in-depth understanding catalytic mechanism, challenging. Herein, we successfully developed subnanoporous Ir3Ni ultrathin nanocages crystallinity The shell enables NCs optimized exposure active sites. Importantly, nickel incorporation contributes to favorable thermodynamics electrocatalysis OER after surface reconstruction hydrogen adsorption free energy in HER electrocatalysis, which induce enhanced intrinsic oxygen evolution reaction (OER) (HER). Together, achieve 3.72 A/mgIr(η=350 mV) 4.47 A/mgIr(η=40 mass activity, are 18.8 times 3.3 higher than that commercial IrO2 Pt, respectively. In addition, their crystalline identity ensures a robust nanostructure, enabling good durability during oxidation. This work provides new revenue toward structural insightful metal alloy mechanisms electrocatalysis.