Oxygen evolution reaction (OER) is one of the key half-reaction in water-splitting hydrogen production and metal-air/metal-oxygen batteries. In this study, we synthesized CNT-supported ZIF-67 metal-organic frameworks (MOFs) for an electrocatalyst for OER in alkaline water electrolysis. MOFs have superior advantages as electrochemical catalysts such as well-defined molecular crystal structure, high surface area, isolated active metal center, and versatile material choice and tunability. However, the low electrical conductivity of coordinated organic ligands limits the full utilization of the merits of MOFs in electrochemical applications. Here, ZIF-67 was synthesized onto highly conductive carbon nanotubes (CNTs) to increase the electrical conductivity of the ZIF-67 OER catalyst in alkaline WE. The prepared ZIF-67@CNT showed excellent electro-activity in an optimized experimental condition. It exhibited a low overpotential of 285 mV at a current density of 10 mA/cm² with a Tafel slope of 57 mV/dec, representing the faster charge transfer reaction and kinetics of OER. In addition, it showed highly stable and durable long-term electroactivity during harsh operating conditions due to the morphological characteristic of the ZIF-67@CNT catalyst, offering a practical future hydrogen production system integrated with unstable renewable energy sources.

析氧反应（OER）是水分解氢生产和金属-空气/金属-氧电池中的关键半反应之一。在这项研究中，我们合成了 CNT 负载的 ZIF-67 金属有机骨架 (MOF)，用于碱性水电解中 OER 的电催化剂。MOFs 作为电化学催化剂具有优越的优势，例如明确的分子晶体结构、高表面积、孤立的活性金属中心以及多种材料选择和可调性。然而，配位有机配体的低电导率限制了MOFs在电化学应用中的优点的充分利用。在这里，ZIF-67 被合成到高导电性碳纳米管 (CNT) 上，以提高 ZIF-67 OER 催化剂在碱性 WE 中的电导率。制备的 ZIF-67@CNT 在优化的实验条件下表现出优异的电活性。它在 10 mA/cm 的电流密度下表现出 285 mV 的低过电位^图2的 Tafel 斜率为 57 mV/dec，代表更快的电荷转移反应和 OER 动力学。此外，由于ZIF-67@CNT催化剂的形态特征，它在恶劣的操作条件下表现出高度稳定和持久的长期电活性，为未来与不稳定的可再生能源相结合的实用制氢系统提供了一个实用的方法。