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Research Article

Kinetic study of electrochemically produced hydrogen bubbles on Pt electrodes with tailored geometries

Jingshan Qin1,§, Tianhui Xie1, Daojin Zhou1,§, Liang Luo1(), Zhengyi Zhang1, Zhicheng Shang1, Jiawei Li1,2, Lagnamayee Mohapatra1, Jinwen Yu1, Haijun Xu1(), Xiaoming Sun1 ()
State Key Laboratory of Chemical Resource Engineering, Beijing Advanced Innovation Centre for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China
Qingdao Institute of Nuokang-Xinqingyuan, Qingdao, Shandong 266700, China

§ Jingshan Qin and Daojin Zhou contributed equally to this work.

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Abstract

Understanding bubbles evolution kinetics on electrodes with varied geometries is of fundamental importance for advanced electrodes design in gas evolution reaction. In this work, the evolution kinetics of electro-generated hydrogen bubbles are recorded in situ on three (i.e. smooth, nanoporous, and nanoarray) Pt electrodes to identify the geometry dependence. The bubble radius shows a time-dependent growth kinetic, which is tightly-connected to the electrode geometry. Among the three electrodes, the smooth one shows a typical time coefficient of 0.5, in consistence with reported values; the nanoporous one shows a time coefficient of 0.47, less than the classic one (0.5); while the nanoarray one exhibits fastest bubble growth kinetics with a time coefficient higher than 0.5 (0.54). Moreover, the nanoarray electrode has the smallest bubble detachment size and the largest growth coefficient (23.3) of all three electrodes. Based on the experimental results, a growth model combined direct bottom- injection with micro-convection is proposed to illustrate the surface geometry dependent coefficients, i.e., the relationship between geometry and bubble evolution kinetics. The direct injection of generated gas molecules from the bottom of bubbles at the three phase boundaries are believed the key to tailor the bubble wetting states and thus determine the bubble evolution kinetics.

Keywords

hydrogen bubble evolutiongrowth kineticssurface geometrysolid surfacediffusion controlled

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Nano Research
Volume 14 Issue 7,
July 2021
Pages 2154-2159
DOI: 10.1007/s12274-020-3132-y
Cite this article:
Qin J, Xie T, Zhou D, et al. Kinetic study of electrochemically produced hydrogen bubbles on Pt electrodes with tailored geometries. Nano Research, 2021, 14(7): 2154-2159. https://doi.org/10.1007/s12274-020-3132-y
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ElectrodesEnergy storageGrowth kineticsHydrogenKinetics
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