Center for Applied Chemical Research, Frontier Institute of Science and Technology, and Shaanxi Key Laboratory of Energy Chemical Process Intensification, School of Chemical Engineering and Technology, Xi'an Jiaotong University , Xi'an 710049, P. R. China.
Shenzhen Research Institute, City University of Hong Kong , Shenzhen 518057, P. R. China.
ACS Appl Mater Interfaces. 2018 Jan 17;10(2):1728-1733. doi: 10.1021/acsami.7b16125. Epub 2018 Jan 5.
The interface between electrolytes and electrocatalysts would largely determine their corresponding activity and stability. Herein, modulating the surface characteristics of NiMo nanoparticles by various adsorbed amines gives the tunability on their interfacial properties and subsequently improves their catalytic performance for hydrogen evolution reaction (HER) in alkaline solutions. Diamines can significantly improve their HER activity by decreasing the charge-transfer resistance and modulating the electronic structures of interfacial active sites. Importantly, among various amines, ethylenediamine facilitates the HER activity of NiMo with a remarkable decrease of 268 mV in the overpotential to reach 10 mA cm as compared with that of the unmodified NiMo in 1.0 M KOH. This method provides a novel strategy of regulating the interfacial properties to strengthen the catalytic performance of electrocatalysts.
电解质和电催化剂之间的界面在很大程度上决定了它们的相应活性和稳定性。在此，通过各种吸附胺来调节 NiMo 纳米颗粒的表面特性，赋予了其界面特性的可调谐性，并随后提高了它们在碱性溶液中析氢反应（HER）的催化性能。二胺通过降低电荷转移电阻和调节界面活性位的电子结构，显著提高了 HER 的活性。重要的是，在各种胺中，乙二胺有利于 NiMo 的 HER 活性，与未经修饰的 NiMo 相比，在 1.0 M KOH 中达到 10 mA cm 时的过电位降低了 268 mV。该方法提供了一种调节界面性质的新策略，以增强电催化剂的催化性能。
