acsami.0c04796just accepted manuscript 2020 4 29.pdf (1.57 MB)
Anti-buoyancy and unidirectional gas evolution by Janus electrodes with asymmetric wettability
journal contribution
posted on 2020-05-05, 09:25 authored by Siyu Sheng, Bairu Shi, Cheng Wang, Liang Luo, Xiao Lin, Pengsong Li, Fanhong Chen, Zhicheng Shang, Hong Meng, Yun Kuang, Wen-Feng LinWen-Feng Lin, Xiaoming SunThe 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 & InterfacesVolume
12Issue
20Pages
23627 - 23634Publisher
American Chemical Society (ACS)Version
- AM (Accepted Manuscript)
Rights holder
© American Chemical SocietyPublisher 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.0c04796Publication date
2020-04-29Copyright date
2020ISSN
1944-8244eISSN
1944-8252Publisher version
Language
- en
Depositor
Prof Wen Feng Lin Deposit date: 4 May 2020Article number
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