Guangxi Key Laboratory of Low Carbon Energy Materials, School of Chemistry and Pharmaceutical Sciences Guangxi Normal University Guilin 541004, China.
Saudi Arabia Basic Industries Corporation at King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia.
Inorg Chem. 2023 Jun 5;62(22):8719-8728. doi: 10.1021/acs.inorgchem.3c01017. Epub 2023 May 23.
Developing efficient electrocatalysts toward hydrogen oxidation and evolution reactions (HER/HOR) in alkaline electrolytes is essential for realizing renewable hydrogen technologies. Herein, we demonstrate that the introduction of dual-active species such as Mo and P (Pt/Mo,P@NC) can effectively regulate the surface electronic structure of platinum (Pt) and significantly improve the HOR/HER performance. The optimized Pt/Mo,P@NC exhibits remarkable catalytic activity, achieving a normalized exchange current density of 2.89 mA cm and a mass activity of 2.3 mA μg, which are approximately 2.2 and 13.5 times higher than those of the state-of-the-art Pt/C catalyst, respectively. Moreover, it performs an impressive HER performance with an overpotential of 23.4 mV at 10 mA cm, which is lower than most documented alkaline electrocatalysts. Experimental results reveal that the modifying effect of Mo and P optimizes the adsorption of H and OH on Pt/Mo,P@NC, resulting in an outstanding catalytic performance. This work has significant theoretical and practical significance for developing a novel and highly efficient catalyst for bifunctional hydrogen electrocatalysis.
在碱性电解质中开发高效的电催化剂，用于氢气氧化和还原反应（HER/HOR），对于实现可再生氢气技术至关重要。在此，我们证明了双活性物种（如 Mo 和 P）的引入（Pt/Mo，P@NC）可以有效地调节铂（Pt）的表面电子结构，并显著提高 HOR/HER 性能。优化后的 Pt/Mo，P@NC 表现出显著的催化活性，归一化交换电流密度达到 2.89 mA cm，质量活性达到 2.3 mA μg，分别约为最先进的 Pt/C 催化剂的 2.2 倍和 13.5 倍。此外，它在 10 mA cm 时具有令人印象深刻的 HER 性能，过电势为 23.4 mV，低于大多数已记录的碱性电催化剂。实验结果表明，Mo 和 P 的修饰效应优化了 H 和 OH 在 Pt/Mo，P@NC 上的吸附，从而表现出优异的催化性能。这项工作对于开发用于双功能氢气电催化的新型高效催化剂具有重要的理论和实际意义。
