N-NiMoO4/NF的制备及其电催化析氢活性-《福建工程学院学报》

文章信息/Info

Title:: Preparation of Ni-Mo2N/NF electrode and its performance in electro-catalytic hydrogen evolution

Author(s):: LIU Xuehua; CHEN Xiyu; HUANG Kaihui; CAI Shenghui; School of Materials Science and Engineering, Fujian University of Technology

Keywords:: Ni-MoxNy/NF electrodes; electro-catalytic hydrogen evolution reaction; structure-performance relationship

摘要:: 采用简单、高效的方法，成功制备了应用于碱性介质电催化制氢的Ni-MoxNy/NF电极，对其进行XRD、SEM、TEM和XPS表征，并系统研究了该电极的电催化析氢性能。结果表明:产物的相组成物为单质Ni、Mo2N及Mo5N6。控制工艺条件，可制备出性能最佳的相结构为Ni-Mo2N，Mo5N6的含量增加不能提高产物的性能；性能最佳试样的显微形貌呈现纳米棒状，Ni(111)与Mo2N(200)构成的异质结构界面赋予材料优异的电催化析氢性能，在碱性电解质中，10mA/cm2下析氢过电位达 21mV，接近20%Pt/C电极(18mV)，Tafel斜率为39.9mV/dec。电极的优异性能既来源于高电化学活性面积，也来源于其高本征活性，跻身当前性能最佳的非贵金属催化材料，为非贵金属碱性析氢电催化材料的、研发提供了新思路。

Abstract:: The Ni-MoxNy/NF nano composite electrodes applied in electro-catalytic hydrogen evolution reaction (HER) in alkaline electrolyte were prepared by a simple and efficient process. The structures of the Ni-MoxNy/NF electrodes were characterized by XRD, SEM, TEM and XPS methods, and the electro-catalytic HER activities of the electrodes were tested systematically. Results show that the crystal structure of the product was composed of Ni, Mo2N and Mo5N6, and the best phase composition is Ni and Mo2N, which showed the best electro-catalytic HER activity among all samples. The Ni and Mo2N could be acquired by controlling the temperature and duration during the thermo nitridation process, meanwhile the content increase of Mo5N6 could not increase the performance of the electrodes. The Ni-Mo2N/NF sample has the morphology of nanorods. The heterostructure interface between Ni (111) crystal and the Mo2N (200) gives the material excellent properties in HER. The Ni-Mo2N/NF reaches an overpotential of 20 mV at 10 mA/cm2, approximating 20% Pt/C electrode (18 mV), with a small tafel slope of 39.9 mV/dec in alkaline electrolytes. The excellent performance of the electrodes comes from both the abundant electrochemical activity area and its high intrinsical activity, making it one of the best non-precious metal catalytic materials. It provides a new idea for the research and development of non-precious metal alkaline hydrogen evolution electrocatalytic materials.