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Anti-buoyancy and unidirectional gas evolution by Janus electrodes with asymmetric wettability

journal contribution
posted on 05.05.2020, 09:25 by Siyu Sheng, Bairu Shi, Cheng Wang, Liang Luo, Xiao Lin, Pengsong Li, Fanhong Chen, Zhicheng Shang, Hong Meng, Yun Kuang, Wen-Feng Lin, Xiaoming Sun
The bubbles electrochemically generated by gas evolution reactions are commonly driven off the electrode by buoyancy, a weak force used to overcome bubble adhesion barriers, leading to low gas transporting efficiency. Herein, a Janus electrode with asymmetric wettability has been prepared by modifying two sides of a porous stainless-steel mesh electrode, with superhydrophobic polytetrafluoroethylene (PTFE) and Pt/C (or Ir/C) catalyst with well-balanced hydrophobicity, respectively; affording unidirectional transportation of as-formed gaseous hydrogen and oxygen from the catalyst side to the gas-collecting side during water splitting. “Bubble-free” electrolysis was realized when “floating” the Janus electrode on the electrolyte. Anti-buoyancy through-mesh bubble transportation was observed when immersing the electrode with PTFE side downward. The wettability gradient within the electrode endowed sticky states of bubbles on the catalyst side, resulting in efficient “bubble-free” gas transportation with 15 folds higher current density than submerged states.

Funding

National Natural Science Foundation of China (NSFC)

National Key Research and Development Project (No. 2018YFB1502401, 2018YFA0702002)

Royal Society and the Newton Fund through the Newton Advanced Fellowship award (NAF\R1\191294)

Program for Changjiang Scholars and Innovation Research Team in the University (No. IRT1205)

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Chemical Engineering

Published in

ACS Applied Materials & Interfaces

Volume

12

Issue

20

Pages

23627 - 23634

Publisher

American Chemical Society (ACS)

Version

AM (Accepted Manuscript)

Rights holder

© American Chemical Society

Publisher statement

This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Applied Materials & Interfaces, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acsami.0c04796

Publication date

2020-04-29

Copyright date

2020

ISSN

1944-8244

eISSN

1944-8252

Language

en

Depositor

Prof Wen Feng Lin Deposit date: 4 May 2020

Article number

acsami.0c04796

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