Work

OH-induced favoring reconstruction of Cu electrode for enhanced stability in formaldehyde oxidation reaction with energy-saving hydrogen production

Year: 2025

Type: article

Abstract: The formaldehyde oxidation reaction (FOR) on a Cu-based electrocatalyst enables hydrogen (H2) at the anode in OH− solution, facilitating a bipolar H2 production system at ultra-low electrolysis voltage. However, the specific impact of *OH adsorption on the Cu surface regarding the FOR has been rarely investigated. Herein, the strong *OH adsorption Cu (S-OH Cu) electrode, which exhibits high activity and excellent stability of FOR, is developed to investigate the specific impact of *OH adsorption on the Cu surface during the FOR process. Impressively, the increased *OH adsorption on the Cu electrode, typically regarded as a poisoning effect that diminishes inherent FOR activity by reducing the adsorption of intermediate reactants, is firstly revealed as an OH-induced favorable reconstruction effect that significantly improves FOR stability. Specifically, the dual functions of OH-induced favoring reconstruction include accelerating the phase transition of the Cu(0)/Cu(I) redox cycle to refresh the active site and optimizing surface reconstruction to preferentially generate Cu(220) with stronger adsorption energy for H2C(OH)O* and lower C-H barrier energy during FOR. This work provides a promising strategy for designing stable Cu electrocatalysts for FOR to produce hydrogen with extremely low energy input.

Source: Nano Research

DOI: 10.26599/nr.2025.94907646