Among the schemes to improve the efficiency of electrochemical hydrogen evolution reaction (HER), molybdenum carbides are seen as suitable candidates to replace noble metal electrocatalysts because of their Pt-like d-band center and proper adsorption of intermediate hydrogen species (H_ads). Iodine is identified to form I−H_ads bond when used as a single-atom electrocatalyst of HER, thereby improving the performance. However, there is no report of combining iodine atoms with molybdenum carbides. We successfully designed a polyoxomolybdate-based precursor molecule which included octamolybdate anions and iodonium cations. After pyrolysis treatment, iodine-doped molybdenum carbide nanocomposite was obtained and exhibited enhanced HER property. This work can verify that iodine atoms can synergistically improve the electrochemical performance of transitional metal nanocomposites, and provide a new insight for the design of advanced HER electrocatalysts.

在提高电化学析氢反应 (HER) 效率的方案中，碳化钼被视为替代贵金属电催化剂的合适候选者，因为它们具有类似 Pt 的 d 带中心和对中间氢物种 (H _ads ) 的适当吸附。碘被识别形成 I-H_广告当用作 HER 的单原子电催化剂时，键合，从而提高性能。然而，没有将碘原子与碳化钼结合的报道。我们成功设计了一种基于聚氧钼酸盐的前体分子，其中包括八钼酸盐阴离子和碘鎓阳离子。经过热解处理，得到了碘掺杂碳化钼纳米复合材料，并表现出增强的 HER 性能。这项工作可以验证碘原子可以协同提高过渡金属纳米复合材料的电化学性能，并为先进的 HER 电催化剂的设计提供新的见解。