Noble Metal Phosphides Supported on CoNi Metaphosphate for Efficient Overall Water Splitting

• DOI: 10.1021/acsami.3c19077
• Publication Date: 2024-02-09T13:49:36Z
• Authors: Bingrong Guo; Jianying Zhao; Yao Xu; Xinxin Wen; Xiaoqian Ren; Xiaoxiao Huang; Siqi Niu; Yulong Dai; Ruhai Gao; Ping Xu; Siwei Li
• Keywords: Noble metal; Overpotential; Phosphide; Metaphosphate

Transition metal metaphosphates and noble phosphides prepared under similar conditions are potential hybrid catalysts for electrocatalytic water splitting, which is of great significance H2 production. Herein, the structure activity different species (i.e., Rh, Pd, Ir) on CoNiP4O12 nanoarrays have been systematically studied. Due to formation energies phosphides, Rh (RhPx) Pd (PdPx) as well Ir obtained same phosphorylation perspectively. RhPx/CoNiP4O12 PdPx/CoNiP4O12 exhibit much better HER than Ir/CoNiP4O12 due advantages phosphides. Density functional theory (DFT) calculations reveal that extraordinary originated from strong affinity H2O optimal adsorption H*. The best only requires a low overpotential 30 234 mV deliver 10 mA cm–2 OER, respectively, therefore effective overall splitting (requiring 1.57 V achieve current density cm–2). This work not develops novel electrocatalyst but also provides deep insight into mechanism