室温固相法制备硼化铁及电催化分解水产氢性能  

Preparation of iron boride by room-temperature solid-phase reaction method and the electrocatalytic hydrogen evolution performance for water splitting

作　　者：刘紫城 童瑞杰 李越湘[1] 彭绍琴[1] LIU Zicheng;TONG Ruijie;LI Yuexiang;PENG Shaoqin(School of Chemistry and Chemical Engineering,Nanchang University,Nanchang 330031,China)

机构地区：[1]南昌大学化学化工学院,江西南昌330031

出　　处：《南昌大学学报（理科版）》2023年第2期134-140,147,共8页Journal of Nanchang University(Natural Science)

基　　金：国家自然科学基金资助项目(21962010)。

摘　　要：采用室温固相反应和煅烧后处理相结合的方法,成功合成了高活性的硼化铁析氢催化剂。通过扫描电子显微镜(SEM)、X射线衍射仪(XRD)、X射线光电子能谱仪(XPS)、电感耦合等离子发射光谱仪(ICP)等技术表征了硼化铁催化剂的组成、结构和形貌。和传统的溶液法制备的硼化铁相比,室温固相法制备出的硼化铁表现出更加优异的析氢性能,在碱性电解质溶液中,在100 mA·cm^(-2)的电流密度下,固相法制备的硼化铁的HER过电位为303 mV,塔菲尔斜率为65 mV·dec^(-1),分别低于溶液法制备的硼化铁的402 mV和80 mV·dec^(-1)。其原因是固相法制备的硼化铁含有比溶液法制备的硼化铁更高的硼含量、更好的导电性。室温固相法制备硼化铁消耗的硼氢化钠要远小于溶液法,且大大减少废水排放,有利于降低制备成本和环境保护,有良好的应用前景。A highly active iron boride electrocatalyst for hydrogen evolution was successfully synthesized by a room-temperature solid-phase reaction(RTSR)followed by calcination post-treatment.The composition,structure and morphology of the catalyst were characterized via scanning electron microscopy(SEM),X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS)and Inductive Coupled Plasma Emission Spectrometer(ICP)techniques.Compared with the iron boride prepared by a traditional solution reaction(SR)method,the iron boride synthesized by RTSR showed much better hydrogen evolution performance.In alkaline electrolyte solution at a current density of 100 mA·cm^(-2),the iron boride prepared by RTSR possessed lower HER overpotential(303 mV)and tafel scope(65 mV dec^(-1))than the iron boride prepared by SR(402 mV,and 80 mV dec^(-1),respectively).The excellent electrocatalytic HER performance was attributed to the higher B content and the electrical conductivity for iron boride prepared by RTSR than those for prepared by SR.RTSR not only consumed much less sodium borohydride than SR,but also reduced the waste water to discharge,which protected the environment and reduced the production cost.RTSR is expected to have a good application prospect.

关 键 词：电催化分解水 析氢反应 过渡金属硼化物 硼化铁 室温固相反应 

分 类 号：O643[理学—物理化学]