Crystalline/amorphous Bi-BiNiO x electrocatalyst enables efficient concurrent formate production from CO 2 and methanol

作者：Zhuangzhuang Ren, Ruihao Wang, Xianghui Pang, Wenqian Zheng, Liheng Sun, Meiqi Wang, Fengcai Lei, Xu Sun, Junfeng Xie · 发表于：Nano Research · 年份：2025 · DOI：10.26599/nr.2025.94908017 · 被引用次数：10 · 研究领域：CO2 Reduction Techniques and Catalysts、Catalysis and Oxidation Reactions、Electrocatalysts for Energy Conversion

Electrochemical CO 2 reduction reaction (CO 2 RR) to formate presents a technoeconomic route for CO 2 utilization under mild conditions, yet practical implementation is constrained by the high energy consumption (>90% of total input) of the anodic oxygen evolution reaction (OER). Replacement of OER by partial methanol oxidation reaction (MOR) could lead to simultaneous formate production at both electrodes and remarkably reduce the overall energy consumption. Herein, we designed a two-electrode system featuring a nickel foam-supported crystalline/amorphous bismuth-bismuth nickel oxide composite cathode (Bi-BiNiO x /NF) and a β-Ni(OH)₂ anode, achieving excellent formate production behavior. The crystalline/amorphous Bi-BiNiO x /NF cathode delivers exceptional CO 2 RR performance, achieving 98.9% formate Faradaic efficiency (FE formate ) at -0.90 V vs. RHE and maintaining >90.7% FE formate over 72 h continuous operation—attributed to its Bi-Ni bimetallic synergy and crystalline/amorphous heterostructure that enhance active site exposure and reaction kinetics. The integrated CO 2 RR||MOR system operates stably for 90 h at 2.2 V and 10 mA cm -2 , sustaining >90% FE formate at both electrodes with a cell voltage (1.760 V) significantly lower than conventional CO 2 RR||OER systems (1.953 V). This work demonstrates efficient concurrent formate electrosynthesis and establishes an energy-efficient paradigm for electrocatalytic CO 2 valorization through synergistic cataly...