Seawater electrolysis provides a desirable pathway for large-scale production of green hydrogen without dependence on freshwater. However, its practical application is seriously hindered by low energy efficiency and insufficient durability because of the detrimental chlorine electro-oxidation and complex components of seawater. Herein, 2D MoN/Co₂N hybrid nanosheets grown on 1D Cu nanowires and integrated on 3D Cu foam electrodes (Co/Mo–N–C/Cu) were fabricated for seawater splitting, which could enable the alkaline seawater electrolyzer assembled with these hierarchically structural electrodes to achieve a current density of 100 mA cm⁻² at a low voltage of 1.70 V, along with good stability due to the synergistic effect among the MoN/Co₂N hybrid nanosheets, unique 1D/2D/3D hierarchical structure, and the N-doped carbon protection layer. Theoretical calculations demonstrated that strong electron transfer occurred at heterogeneous interfaces, which could mediate the adsorption and desorption of intermediates, thus reducing the reaction energy barriers.

中文翻译：

---

具有强电子相互作用的分层双金属氮化物混合电极可提高海水中的氢气产量

海水电解为大规模生产绿色氢而不依赖淡水提供了理想的途径。然而，由于有害的氯电氧化和海水成分复杂，其实际应用受到能源效率低和耐久性不足的严重阻碍。在此，制备了在 1D Cu 纳米线上生长并集成在 3D Cu 泡沫电极（Co/Mo–N–C/Cu）上的 2D MoN/Co ₂ N 杂化纳米片，用于海水分解，这可以使由这些分层组装的碱性海水电解槽成为可能。结构电极在1.70 V的低电压下实现100 mA cm ^-2的电流密度，并且由于MoN/Co ₂ N杂化纳米片之间的协同效应而具有良好的稳定性，独特的1D/2D/3D分级结构，以及N掺杂碳保护层。理论计算表明，异质界面处发生强烈的电子转移，可以介导中间体的吸附和解吸，从而降低反应能垒。