摘要
分别采用玻碳(GC)、铂(Pt)和金(Au)电极研究了在Brnsted酸性离子液体[HMIm]HSO_4中电解水制氢的催化活性,活性大小为Pt>Au>>GC。水中离子液体的含量对析氢电流影响很大,当[HMIm]HSO_4含量为30%(V/V)时,Pt电极催化电解水产氢的阈值电位高达-0.3 V(Ag丝为准参比电极,Ag QRE),在-0.5 V(Ag QRE)处电流密度高达110.52 m A/cm2,为相同条件下Au电极的15倍,GC电极的650倍。计算结果表明,Pt电极在该电解液中的反应活化能为5.68 kJ/mol。电极的高催化活性与[HMIm]HSO_4电离产生的质子有关,使水以H3O+的形式捕集电子,效率更高。
The water electrolysis for production of hydrogen in the Bronsted acid ionic liquid [ HMIm] HSO4 aqueous solutions was investigated using glassy carbon ( GC ) , platinum ( Pt ) , and gold ( Au ) electrodes, respectively. It was found that the catalytic activity of the electrodes in the acid ionic liquid electrolytes ranked in sequence as Pt 〉 Au 〉〉 GC. The optimal concentration of [ HMIm] HSO4 in aqueous solutions was 30%( V/V ) , and the catalytic current density on Pt electrode for hydrogen evolution reaction ( HER ) at-0. 5 V (Ag QRE) reached 110. 52 mA/cm^2. This was 15 and 650-fold larger than the current on the Au and GC electrode, respectively. The Arrhenius activation energy of the Pt electrode in the electrolyte solution was 5. 68 kJ/mol. The high catalytic activity of the electrode was attributed to the [ HMIm] HSO4 that would release protons enabling H2 O molecules ionization, and facilitating the capture of electrons from the electrode.
作者
陈佳志
孟玲祎
王雅静
孟晋磊
江峰
楚哲
刘洪涛
CHEN Jia-Zhi MENG Ling-Yi WANG Ya-Jing MENG Jin-Lei JIANG Feng CHU Zhe LIU Hong-Tao(College of Chemistry & Chemical Engineering, Central South University, Changsha 410083, China)
出处
《分析化学》
SCIE
EI
CAS
CSCD
北大核心
2016年第12期1907-1911,共5页
Chinese Journal of Analytical Chemistry
基金
国家自然科学基金(No.21071153)
湖南省科技计划(No.2014FJ2007)资助项目~~
关键词
电解水
制氢
酸性离子液体
催化活性
活化能
Water electrolysis
Production of hydrogen
Acid ionic liquid
Catalytic activity
Activation energy