A novel structure of quasi-monolayered NiCo-bimetalphosphide for superior electrochemical performance

Long Zhao, Ming Wen*, Yakun Tian, Qingsheng Wu, Yongqing Fu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Bimetallic transition metal phosphides (TMPs) as potential candidates for superior electrochemical performance are still facing great challenges in the controllable preparation of two-dimensional (2D) structures with high aspect ratio. Herein, a novel structure of quasi-monolayered NiCo-bimetal-phosphide (NiCoP) has been designed and successfully synthesized by the newly developed process combined with ultrasonic-cavitation and phase-transition. This is the first time to break through the controllable preparation of 2D bimetal-phosphides with a thickness of 0.98 nm in sub-nanoscale. Based on the advantages of 2D quasi-monolayer structure with dense crystalline-amorphous interface and the reconfigured electronic structure between Niδ+/Coδ+ and Pδ−, the optimized Ni5%CoP exhibits an outstanding bifunctional performance for electrocatalyzing both hydrogen evolution reaction and oxygen evolution reaction in an alkaline medium. Ni5%CoP presents lower overpotentials and voltage of 84 mV & 259 mV and 1.48 V at the current density of 10 mA·cm−2 for HER & OER and overall water splitting, respectively, which are superior to most other reported 2D bimetal-phosphides. This work provides a new strategy to optimize the performance of electrolytic water for bimetal-phosphates and it may be of significant value in extending the design of other ultrathin 2D structured catalysts.
Original languageEnglish
JournalJournal of Energy Chemistry
Early online date22 Jul 2022
DOIs
Publication statusE-pub ahead of print - 22 Jul 2022

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