颗粒粒径对激光喷涂镍涂层碱水电解催化性能的影响  

Effects of Particle Sizes on Alkaline Water Electrolytic Catalytic Properties of Laser Sprayed Nickel Coatings

作　　者：齐昊添 葛成杰 叶鑫宇 桂雄辉 张勤号 任潞 陈秀勇 所新坤 QI Haotian;GE Chengjie;YE Xinyu;GUI Xionghui;ZHANG Qinhao;REN Lu;CHEN Xiuyong;SUO Xinkun(Multidimensional Additive Manufacturing Institute,Faculty of Mechanical Engineering and Mechanics,Ningbo University,Ningbo 315211,China)

机构地区：[1]宁波大学机械工程与力学学院多维增材制造研究所,浙江宁波315211

出　　处：《材料保护》2024年第9期1-9,共9页Materials Protection

基　　金：国家自然科学基金(52171072)。

摘　　要：激光喷涂技术是一种新型热喷涂技术,其原理是利用激光作为热源加热粉末,使颗粒达到熔化或半熔化状态,并在基体表面形成涂层。采用激光喷涂技术在镍网表面制备镍涂层,采用扫描电子显微镜(SEM)表征所制备涂层的表面形貌,通过电化学方法表征电极的析氢反应(HER)和析氧反应(OER)催化活性,研究了镍的颗粒粒径对涂层电解催化性能的影响。结果表明:颗粒粒径会影响颗粒在通过激光时的熔化程度。随着颗粒粒径的减小,所制备的电极表面沉积的颗粒数量增加,在电极表面发现孔洞结构颗粒,同时电极的析氢和析氧过电位下降,双层电容值增加,阻抗降低,表明制备的电极的HER和OER活性提升。平均粒径为45μm粉末所制备的电极在HER和OER中展现出最佳催化活性,当电流密度为10 mA/cm^(2)时,其过电位分别为416 mV和371 mV。本研究为高效率低成本绿色制备碱水电解制氢催化电极提供了一种新方法。Laser spraying technology is a new type of thermal spraying technology,which is based on the principle of using laser as a heat source to heat the powder so that the particles reach a molten or semi-molten state and form a coating on the surface of the substrate.In this work,the nickel coatings were fabricated on the surface of nickel mesh through laser spraying.The surface morphology of the coatings was characterized by scanning electron microscopy(SEM).The catalytic activity of hydrogen evolution reaction(HER)and oxygen evolution reaction(OER)of electrodes was characterized by electrochemical methods,and the effect of nickel particle size on the electrolytic catalytic performance of coatings was studied.The results showed that the particle size affected the degree of melting of the particles when passing through the laser.The number of particles deposited on the surface of the prepared electrodes increased as the particle size decreased,and pore structure particles were found on the electrode surface,while the HER and OER overpotentials of the electrodes decreased,the double-layer capacitance value increased,and the impedance decreased,indicating that the HER and OER activities of the prepared electrodes were enhanced.The electrode prepared with an average particle size of 45μm powder showed the best catalytic activity in HER and OER,with overpotentials of 416 mV and 371 mV,respectively,at a current density of 10 mA/cm ^(2).This study provided a new method for the efficient and low-cost green preparation of catalytic electrodes for hydrogen production by alkaline water electrolysis.

关 键 词：碱水电解制氢 激光喷涂 镍涂层 颗粒粒径 析氢反应 析氧反应 组织结构 

分 类 号：TG174.4[金属学及工艺—金属表面处理]