Han Meina, Yang Jun, Jiang Jintian, Jing Renwei, Ren Shijie, Yan Chao
School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, PR China.
College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu 610065, PR China.
J Colloid Interface Sci. 2021 Jan 15;582(Pt B):1099-1106. doi: 10.1016/j.jcis.2020.09.001. Epub 2020 Sep 8.
The exploration of low cost electrocatalyst with comparable catalytic activity and kinetics to the expensive noble metal catalysts for hydrogen evolution reaction (HER) is still the most urgent challenge. Herein, a facile strategy to synthesize TiCT MXene by ultrasonication with controlled N-doping is reported. The surface modification of MXene can be achieved by the formation of TiN chemical bonds at an optimized ultrasonic temperature, which will further enhance the HER activity. Specifically, at the ultrasonic temperature of 35 °C, the N-doped MXene (N-MXene-35) exhibits the highest concentration of TiN bond, delivering an extraordinary HER activity with an overpotential of 162 mV (vs. the reversible hydrogen electrode, RHE) at the current density of 10 mA cm in acid media, which is 3.5 times lower than that of the pristine MXene (578 mV vs. RHE). As expected, the obtained N-MXene-35 affords the best HER electrocatalytic performance among the MXene or N-doped MXene electrode as so far reported.
探索具有与昂贵的贵金属催化剂相当的催化活性和动力学的低成本析氢反应（HER）电催化剂仍然是最紧迫的挑战。在此，报道了一种通过超声处理并控制氮掺杂来合成TiCT MXene的简便策略。MXene的表面改性可以通过在优化的超声温度下形成TiN化学键来实现，这将进一步提高HER活性。具体而言，在35℃的超声温度下，氮掺杂的MXene（N-MXene-35）表现出最高浓度的TiN键，在酸性介质中，在电流密度为10 mA cm时，其析氢活性卓越，过电位为162 mV（相对于可逆氢电极，RHE），这比原始MXene的过电位（578 mV vs. RHE）低3.5倍。不出所料，所获得的N-MXene-35在迄今为止报道的MXene或氮掺杂MXene电极中具有最佳的析氢电催化性能。
