Enriched edge sites of ultrathin Ni3S2/NiO nanomeshes promote surface reconstruction for robust electrochemical water splitting

• DOI: 10.1016/j.nanoen.2024.110020
• Publication Date: 2024-07-18T20:37:48Z
• Authors: Min Zhao; Jingkun Wang; Chengqiang Wang; Ying Sun; Peizhi Liu; Xiaoqiang Du; Hongge Pan; Hui Li; Haojie Liang; Junjie Guo; Tianyi Ma
• Keywords: Non-blocking I/O; Oxygen evolution; Nickel sulfide

Developing highly efficient nonnoble bifunctional electrocatalysts for both the H2 evolution reaction (HER) and O2 (OER) is essential but challenging overall water splitting (OWS). Ni based catalysts are proved as promising candidates splitting, which usually undergo surface reconstruction by transforming into nickel oxyhydroxides active sites. Although evidence suggests that originates from exchange of lattice oxygen with OH- in electrolyte under electric field, modulating remains a great challenge. Herein, we propose an edge sites enrichment strategy to promote phase evolution. The one-step synthesized ultrathin Ni3S2/NiO nanomeshes exhibited porous structure contain abundant in-plane interface Owing unique structure, possessed affinity feature proton OH-, resulting faster Ni3S2 Ni(OH)2 than bulk subsequently converted γ-NiOOH lower adsorption barrier H*. Consequently, outstanding OER activity (300 mV at 200 mA cm−2) unexpected HER (73 10 1.0 M KOH. Remarkably, achieved ultralow voltage 1.41 V cm−2 excellent stability prevailed over most reported catalysts. Moreover, performed yield 900 µmol/h solar-assisted system minimum sales price $1.77/kg, much commercial catalyst ($7.18/kg). This work sets new benchmark monometallic industrial provides insights synthesis 2D nanomeshes.