Ou Changjie, Huang Zhongkai, Yan Xiaoyu, Kong Xiangzhong, Chen Xi, Li Shi, Wang Lihua, Wan Zhongmin
College of Mechanical Engineering, Hunan Institute of Science and Technology, Yueyang 414006, China.
School of Energy and Electrical Engineering, Hunan Institute of Science and Technology, Yueyang 414006, China.
Molecules. 2024 Aug 16;29(16):3877. doi: 10.3390/molecules29163877.
The scalable fabrication of cost-efficient bifunctional catalysts with enhanced hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) performance plays a significant role in overall water splitting in hydrogen production fields. MoSe is considered to be one of the most promising candidates because of its low cost and high catalytic activity. Herein, hierarchical nitrogen-doped carbon networks were constructed to enhance the catalytic activity of the MoSe-based materials by scalable free-drying combined with an in situ selenization strategy. The rationally designed carbonaceous network-encapsulated MoSe composite (MoSe/NC) endows a continuous honeycomb-like structure. When utilized as a bifunctional electrocatalyst for both HER and OER, the MoSe/NC electrode exhibits excellent electrochemical performance. Significantly, the MoSe/NC‖MoSe/NC cells require a mere 1.5 V to reach a current density of 10 mA cm for overall water splitting in 1 M KOH. Ex situ characterizations and electrochemical kinetic analysis reveal that the superior catalytic performance of the MoSe/NC composite is mainly attributed to fast electron and ion transportation and good structural stability, which is derived from the abundant active sites and excellent structural flexibility of the honeycomb-like carbon network. This work offers a promising pathway to the scalable fabrication of advanced non-noble bifunctional electrodes for highly efficient hydrogen evolution.
可扩展制备具有增强析氢反应（HER）和析氧反应（OER）性能的低成本双功能催化剂，在制氢领域的全水分裂中起着重要作用。由于其低成本和高催化活性，MoSe被认为是最有前途的候选材料之一。在此，通过可扩展的冷冻干燥结合原位硒化策略构建了分级氮掺杂碳网络，以增强基于MoSe的材料的催化活性。合理设计的碳质网络包裹的MoSe复合材料（MoSe/NC）具有连续的蜂窝状结构。当用作HER和OER的双功能电催化剂时，MoSe/NC电极表现出优异的电化学性能。值得注意的是，MoSe/NC‖MoSe/NC电池在1 M KOH中进行全水分裂时，仅需1.5 V即可达到10 mA cm的电流密度。非原位表征和电化学动力学分析表明，MoSe/NC复合材料优异的催化性能主要归因于快速的电子和离子传输以及良好的结构稳定性，这源于蜂窝状碳网络丰富的活性位点和优异的结构灵活性。这项工作为可扩展制备用于高效析氢的先进非贵金属双功能电极提供了一条有前途的途径。
