Herein, through a rapid Joule heating method, we have successfully prepared well lattice-matched Co₂Mo₃O₈/MoO₂ heterointerfaces on Ni foam (Co₂Mo₃O₈/MoO₂/NF) in only 130 s. Notably, the rapid Joule heating can effectively avoid oxidation of catalyst caused by prolonged heating and achieve rich uncoordinated Mo⁴⁺ sites, which contributed to the enhanced electrocatalytic performance in hydrogen evolution reaction (HER). As-prepared Co₂Mo₃O₈/MoO₂ delivered remarkable HER activity (23 mV at 10 mA cm⁻²), which was comparable to Pt-based electrocatalyst. As-prepared sample also revealed excellent stability at 200-h test in electrocatalytic splitting of alkaline seawater. Of particular note, the solar-driven H₂O-H₂ electrolyzer also showed a promising solar-to-hydrogen (STH) efficiency of 12.4 %. The cell voltage for the home-made anion exchange membrane (AEM) seawater electrolyzer was only 2.13 V at 200 mA·cm⁻² at 50 °C, and only 4.7 kW-h required to produce 1 m³ of H₂. DFT calculations revealed that the electron redistribution spontaneously takes place at Co–O–Mo bonds at Co₂Mo₃O₈/MoO₂ heterointerfaces, which could regulate the electronic structure and d-band center of Mo sites, and then achieve high-efficiency adsorption of H₂O on Mo sites and near-zero hydrogen-adsorption free energy on O sites. This study provided a new strategy to regulate the chemical states via Joule heating for highly efficient seawater splitting to evolve H₂.

在此，通过快速焦耳加热方法，我们仅在130秒内就成功在泡沫镍上制备了晶格匹配良好的Co ₂ Mo ₃ O ₈ /MoO _{2异质界面（Co 2} Mo ₃ O ₈ /MoO _{2 /NF）。}值得注意的是，快速焦耳加热可以有效避免长时间加热引起的催化剂氧化，并获得丰富的不配位Mo ⁴⁺位点，这有助于增强析氢反应（HER）中的电催化性能。所制备的 Co ₂ Mo ₃ O ₈ /MoO ₂具有显着的 HER 活性（10 mA cm 时为 23 mV）^-2 )，与 Pt 基电催化剂相当。所制备的样品在碱性海水电催化分解的 200 小时测试中也显示出优异的稳定性。特别值得注意的是，太阳能驱动的 H ₂ O-H ₂电解槽还显示出令人鼓舞的太阳能制氢 (STH) 效率，高达 12.4%。自制的阴离子交换膜(AEM)海水电解槽在50℃、200mA·cm ^{-2条件下的电池电压仅为2.13V，产生1m 3} H ₂仅需4.7kW-h 。DFT 计算表明电子重新分布自发地发生在 Co ₂ Mo ₃ O ₈ /MoO _{2的 Co-O-Mo 键上}异质界面可以调节Mo位点的电子结构和d带中心，从而实现H ₂ O在Mo位点上的高效吸附和O位点上氢吸附自由能接近于零的效果。这项研究提供了一种通过焦耳热调节化学态的新策略，以实现高效海水分解以产生 H ₂。