Role of Bridge-bonded Formate in Formic Acid Dehydration to CO at Pt Electrode： Electrochemial in-situ Infrared Spectroscopic Study  

电化学红外光谱研究铂电极上甲酸分解成C0的反应中桥式吸附甲酸根的作用

作　　者：张尊彪[1] 徐杰[1] 康婧[1] 陈艳霞[1] 

机构地区：[1]中国科学技术大学化学物理系,合肥微尺度物质科学国家实验室,合肥230026

出　　处：《Chinese Journal of Chemical Physics》2013年第4期471-476,J0002,共7页化学物理学报（英文）

摘　　要：Formic acid （HCOOH） decomposition at Pt film electrode has been studied by electrochem- ical in situ FTIR spectroscopy under attenuated-total-reflection configuration, in order to clarify whether bridge-bonded formate （HCOOD） is the reactive intermediate for COad for-mation from HCOOH molecules. When switching from HCOOH-free solution to HCOOH- containing solution at constant potential （E=0.4 V vs. RHE）, we found that immediately upon solution switch COad formation rate is the highest, while surface coverage of formate is zero, then after COad formation rate decreases, while formate coverage reaches a steady state coverage quickly within ca. 1 s. Potential step experiment from E=0.75 V to 0.35 V, reveals that formate band intensity drops immediately right after the potential step, while the COad signal develops slowly with time. Both facts indicate that formate is not the reactive intermediate for formic acid dehydration to CO.

关 键 词：Mechanism for formic acid dehydration Formate intermediate CO pathway Pt electrode Infrared spectroscopic studies under attenuated total reflection configuration 

分 类 号：O[理学]