Fabrication of low-cost but effective catalytic electrode for oxygen evolution is an important issue for water splitting. In this study, a self-supporting electrode composed of hierarchical microstructure was fabricated by a surface configuration strategy. Thin nanosheet-like Fe-Co sulfide units were loaded on one-dimensional Cu₂O/Cu framework through an electrodeposition route, during which Cu(OH)₂ nanowires were used as a template to generate one-dimensional Cu₂O/Cu framework. Benefiting from the unique hierarchal microstructure that can expose more catalytic active centers and facilitate the release of oxygen bubbles, this self-supported Fe-Co-S/Cu₂O/Cu catalytic electrode presents superb catalytic activity towards oxygen evolution. In 1 M KOH, the obtained catalytic electrode only requires an overpotential of 338 mV for 50 mA cm⁻². It is proposed that oxyhydroxides involved with sulfur species formed on the electrode surface during oxygen evolution process, while the hierarchical microstructure of the electrode keeps. Especially, the Fe-Co-S/Cu₂O/Cu catalytic electrode shows excellent catalytic performance for salty water and real seawater splitting, and demonstrates excellent catalytic stability. This study provides an effective strategy towards the fabrication of metal sulfide electrode with hierarchical microstructure for water/seawater splitting.

制造低成本但有效的析氧催化电极是水分解的一个重要问题。在这项研究中，通过表面配置策略制造了由分层微结构组成的自支撑电极。通过电沉积途径将薄纳米片状Fe-Co硫化物单元负载在一维Cu ₂ O/Cu骨架上，在此过程中以Cu(OH) ₂纳米线为模板生成一维Cu ₂ O/Cu骨架. 受益于独特的分层微观结构，可以暴露更多的催化活性中心并促进氧气泡的释放，这种自支撑的 Fe-Co-S/Cu ₂O/Cu 催化电极对析氧具有极好的催化活性。在 1 M KOH 中，获得的催化电极对于 50 mA cm ^-2仅需要 338 mV 的过电位。提出在析氧过程中在电极表面形成与硫物种相关的羟基氧化物，而电极的分级微观结构保持不变。尤其是Fe-Co-S/Cu ₂ O/Cu催化电极对咸水和真实海水分解表现出优异的催化性能，并表现出优异的催化稳定性。该研究为制备具有分层微观结构的用于水/海水分解的金属硫化物电极提供了一种有效的策略。