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Anti-buoyancy and unidirectional gas evolution by Janus electrodes with asymmetric wettability
journal contributionposted on 05.05.2020 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
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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.
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)
- Aeronautical, Automotive, Chemical and Materials Engineering
- Chemical Engineering