摘要
利用循环伏安法,研究了CO2-H2O体系在Pt电极上的析氢反应,与单纯析氢反应相比,还原峰电位发生负偏移,还原峰电位为-0.5,V.并通过计算,得出在pH=4附近CO2扩散系数DC O2=3.02×10-10,m2/s,H+扩散系数DH+=4.93×10-9,m2/s,电极表面的反应层厚度+30bH HCOμ=D/(k c-)及H+的浓度分布函数0c+=c+1ΗΗ[-30b HCO Hexp x k c/D+{-}]-.为电流法测定CO2气体浓度的方法提供了基础参考数据.
Abstract： The research used cyclic voltammetry to obtain stable voltammograms of HER in CO2-H20 system on Pt elec- trode. Compared with the voltammograms of HER in HCI-H20 system, the reductive potential （Epc = -0.5）shows negative shift. The diffusion coefficient of H＋ , CO2, the width of reaction layer and the function of concentration distribution of CO2were calculated. The values are Dco2 =3.02 Х 10^-10 m^2/s, DH＋ =4.93 Х 10^-9 m^2/s,μ=√DH＋/（kbc°HCO-3） ,CH＋=C°H＋[1-exp{-x√kbc°-HCO2/DH＋}],respectively. These parameters are of fundamental significance in using electrochemicaltechnology to detect CO2.
出处
《天津科技大学学报》
CAS
2012年第4期44-47,56,共5页
Journal of Tianjin University of Science & Technology
关键词
二氧化碳
循环伏安法
前置化学反应
析氢反应
反应层
carbon dioxide
cyclic voltammetry
prior chemical reaction
hydrogen evolution
reaction layer
