Yang Yuting, Dai Qiumei, Shi Luyan, Liu Yi, Isimjan Tayirjan Taylor, Yang Xiulin
Guangxi Key Laboratory of Low Carbon Energy Materials, School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University, Guilin 541004, People's Republic of China.
Saudi Arabia Basic Industries Corporation (SABIC) at King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia.
J Phys Chem Lett. 2022 Mar 10;13(9):2107-2116. doi: 10.1021/acs.jpclett.2c00021. Epub 2022 Feb 28.
Electrochemical energy conversion and storage through hydrogen has revolutionized sustainable energy systems using fuel cells and electrolyzers. Regrettably, the sluggish alkaline hydrogen oxidation reaction (HOR) hampers advances in fuel cells. Herein, we report a Pt/NiN-MoC bifunctional electrocatalyst toward HOR and hydrogen evolution reaction (HER). The Pt/NiN-MoC exhibits remarkable HOR/HER performance in alkaline media. The mass activity at 50 mV and exchange current density of HOR are 5.1 and 1.5 times that of commercial Pt/C, respectively. Moreover, it possesses an impressive HER activity with an overpotential of 11 mV @ 10 mA cm, which is lower than that of Pt/C and most reported electrocatalysts under the same conditions. Density functional theory (DFT) calculations combined with experimental results reveal that Pt/NiN-MoC not only possesses an optimal balance between hydrogen binding energy (HBE) and OH adsorption but also facilitates water adsorption and dissociation on the catalyst surface, which contribute to the excellent HOR/HER performance. Thus, this work may guide bifunctional HOR/HER catalyst design in the conversion and transport of energy.
通过氢进行的电化学能量转换和存储，已经彻底改变了使用燃料电池和电解槽的可持续能源系统。遗憾的是，迟缓的碱性氢氧化反应（HOR）阻碍了燃料电池的发展。在此，我们报道了一种用于HOR和析氢反应（HER）的Pt/NiN-MoC双功能电催化剂。Pt/NiN-MoC在碱性介质中表现出卓越的HOR/HER性能。在50 mV时的质量活性和HOR的交换电流密度分别是商业Pt/C的5.1倍和1.5倍。此外，它具有令人印象深刻的HER活性，在10 mA cm下过电位为11 mV，低于相同条件下的Pt/C和大多数已报道的电催化剂。密度泛函理论（DFT）计算结合实验结果表明，Pt/NiN-MoC不仅在氢结合能（HBE）和OH吸附之间具有最佳平衡，而且还促进了水在催化剂表面的吸附和解离，这有助于实现优异的HOR/HER性能。因此，这项工作可能会为能量转换和传输中的双功能HOR/HER催化剂设计提供指导。
