Monolayered Ni-based layered double hydroxides (LDHs) enriched with hydroxyl vacancies are synthesized and first applied in the methanol-assisted energy-saving hydrogen production system including independent electrolysis and photovoltaic-electrolysis. The rich hydroxyl vacancies are revealed to endow monolayered LDHs with significantly superior performance in the aspects of the activity for methanol oxidation reaction and the boosting effect for cathodic hydrogen production compared to the bulk counterparts. The theoretical and experimental results confirm that the hydroxyl vacancies can increase density of states near Fermi level of LDH (i.e. elevate electrical conductivity to form favorable charge transportation during electrocatalysis), and promote its adsorption and further cleavage for methanol, thus leading to the enhanced methanol oxidation reaction performance.

单层镍基层状双氢氧化物合成了富含羟基空位的LDHs，并首次应用于甲醇辅助节能制氢系统，包括独立电解和光伏电解。与本体对应物相比，丰富的羟基空位赋予单层LDHs在甲醇氧化反应活性和阴极产氢促进作用方面具有显着优越的性能。理论和实验结果证实，羟基空位可以增加LDH费米能级附近的态密度（即提高电导率，在电催化过程中形成有利的电荷传输），促进其对甲醇的吸附和进一步裂解，从而增强甲醇氧化反应性能。