Exploring efficient non-precious electrocatalysts for both the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is crucial for many renewable energy conversion processes. In this work, we report that 2D Co₂[email protected]₃O₄ microsheets can be prepared through an in-situ toptactic conversion from single-crystal β-Co(OH)₂ microplatelets, associated with a surface phosphatization and corrosion process. The resultant Co₂[email protected]₃O₄ 2D hybrid materials can further serve as self-supported bifunctional catalytic electrodes to drive the overall water splitting for HER and OER simultaneously, with low overpotentials and high long-term stability. Furthermore, a water electrolyzer based on Co₂[email protected]₃O₄ hybrid as both anode and cathode is fabricated, which achieves 10 mA cm⁻² current at only 1.57 V during water splitting process. Therefore, this work provides a facile strategy to obtain 2D Co₂P-based micro/nanostructures, which act as low-cost and highly active electrocatalysts towards overall water splitting application.

对于氢气释放反应（HER）和氧气释放反应（OER）而言，探索有效的非贵金属电催化剂对于许多可再生能源转化过程至关重要。在这项工作中，我们报告说可以通过单晶β - Co（OH）₂微片的原位拓扑转换与表面磷化和腐蚀过程相关联来制备2D Co ₂ [受电子邮件保护] ₃ O ₄微片。生成的Co ₂ [受电子邮件保护] ₃ O ₄2D杂化材料还可以用作自支撑双功能催化电极，以同时驱动HER和OER的总水分解，且超电势低且长期稳定性高。此外，制造了基于Co ₂ [电子邮件保护] ₃ O ₄杂化物作为阳极和阴极的水电解槽，该水电解槽在分水过程中仅1.57 V即可实现10 mA cm ^-2的电流。因此，这项工作为获得基于₂ Co ₂ P的微/纳米结构提供了一种简便的策略，该结构可作为低成本和高活性的电催化剂，适用于整个水分解应用。