The fabrication of high-performance and stable electrocatalysts for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is of importance for sustainable water-splitting technologies. Herein, the cobalt (Co) nanoparticles and molybdenum carbide (Mo₂C) heterostructures anchored N-doped carbon (Co/Mo₂C@NC-800) was designed as bifunctional electrocatalyst for overall water splitting via a simple pyrolysis approach for metal organic frameworks (MOFs) precursor. This composite shows a remarkable performance for HER and OER with a small overpotential of 121 mV and 311 mV at 10 mA cm⁻², respectively. When the optimized electrocatalyst was employed as both anode and cathode for overall water splitting in a two-electrode system, the electrolyzer achieves a low cell voltage of 1.67 V at 10 mA cm⁻² in 1 M KOH, as well as a superior and stable long-time operation of 30 h. The promising hybrid material demonstrates excellent electrocatalysis performance due to effective combination of the best of both worlds: Mo₂C with remarkable HER performance and Co nanoparticles with excellent OER activity. The Mo₂C possesses strong hydrogen binding energy and Co exhibits prominent electrical conductivity, thus the construction of heterostructures achieves more active sites with different functions and significantly boosts HER and OER process. The novel and effective synthesis strategy provides new insights into the design of outstanding non-noble metal bifunctional electrocatalysts for overall water splitting.

氢气释放反应（HER）和氧气释放反应（OER）的高性能，稳定的电催化剂的制造对于可持续的水分解技术至关重要。在此，钴（Co）纳米颗粒和碳化钼（Mo ₂ C）异质结构锚定的N掺杂碳（Co / Mo ₂ C @ NC-800）被设计为双功能电催化剂，通过简单的热解方法对金属有机物进行整体水分解框架（MOF）的前身。该复合材料显示出卓越的HER和OER性能，在10 mA cm ^-2时具有121 mV和311 mV的小过电位， 分别。当在两电极系统中将优化的电催化剂同时用作阳极和阴极进行总水分解时，该电解器在1 M KOH中的10 mA cm ^-2时可实现1.67 V的低电池电压，并且性能优异且稳定长时间运行30小时。有前景的杂化材料由于两方面优点的有效结合而具有优异的电催化性能：具有卓越的HER性能的Mo ₂ C和具有出色的OER活性的Co纳米颗粒。莫₂C具有很强的氢键能，Co具有出色的电导率，因此异质结构的构建可实现具有不同功能的更多活性位点，并显着促进了HER和OER过程。新颖有效的合成策略为整体水分解的杰出非贵金属双功能电催化剂的设计提供了新见识。