Volume 34 Issue 2
Apr.  2021
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Yan-li Tang, Wei Chen, Mian-le Xu, Zhen Wei, Jun Cai, Yan-xia Chen. Unravelling Hydrogen Adsorption Kinetics on Ir(111) Electrode in Acid Solutions by Impedance Spectroscopy[J]. Chinese Journal of Chemical Physics , 2021, 34(2): 179-187. doi: 10.1063/1674-0068/cjcp2006105
Citation: Yan-li Tang, Wei Chen, Mian-le Xu, Zhen Wei, Jun Cai, Yan-xia Chen. Unravelling Hydrogen Adsorption Kinetics on Ir(111) Electrode in Acid Solutions by Impedance Spectroscopy[J]. Chinese Journal of Chemical Physics , 2021, 34(2): 179-187. doi: 10.1063/1674-0068/cjcp2006105

Unravelling Hydrogen Adsorption Kinetics on Ir(111) Electrode in Acid Solutions by Impedance Spectroscopy

doi: 10.1063/1674-0068/cjcp2006105
More Information
  • Corresponding author: Cai Jun E-mail: juncai@ustc.edu.cn; Chen Yan-xia, E-mail: yachen@ustc.edu.cn
  • Received Date: 2020-06-19
  • Accepted Date: 2020-11-04
  • Available Online: 2020-11-25
  • Publish Date: 2021-04-27
  • The kinetics for hydrogen (H) adsorption on Ir(111) electrode has been studied in both HClO$ _4 $ and H$ _2 $SO$ _4 $ solutions by impedance spectroscopy. In HClO$ _4 $, the adsorption rate for H adsorption on Ir(111) increases from 1.74$ \times $10$ ^{-8} $ mol$ \cdot $cm$ ^{-2} $$ \cdot $s$ ^{-1} $ to 3.47$ \times $10$ ^{-7} $ mol$ \cdot $cm$ ^{-2} $$ \cdot $s$ ^{-1} $ with the decrease of the applied potential from 0.2 V to 0.1 V (vs. RHE), which is ca. one to two orders of magnitude slower than that on Pt(111) under otherwise identical condition. This is explained by the stronger binding of water to Ir(111), which needs a higher barrier to reorient during the under potential deposition of H from hydronium within the hydrogen bonded water network. In H$ _2 $SO$ _4 $, the adsorption potential is ca. 200 mV negatively shifted, accompanied by a decrease of adsorption rate by up to one order of magnitude, which is explained by the hindrance of the strongly adsorbed sulfate/bisulfate on Ir(111). Our results demonstrate that under electrochemical environment, H adsorption is strongly affected by the accompanying displacement and reorientation of water molecules that initially stay close to the electrode surface.

     

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