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Antibuoyancy and Unidirectional Gas Evolution by Janus Electrodes with Asymmetric Wettability.
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2020-05-08 , DOI: 10.1021/acsami.0c04796
Siyu Sheng 1 , Bairu Shi 2 , Cheng Wang 3 , Liang Luo 1 , Xiao Lin 4 , Pengsong Li 1 , Fanhong Chen 1 , Zhicheng Shang 1 , Hong Meng 1 , Yun Kuang 1 , Wen-Feng Lin 5 , Xiaoming Sun 1
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2020-05-08 , DOI: 10.1021/acsami.0c04796
Siyu Sheng 1 , Bairu Shi 2 , Cheng Wang 3 , Liang Luo 1 , Xiao Lin 4 , Pengsong Li 1 , Fanhong Chen 1 , Zhicheng Shang 1 , Hong Meng 1 , Yun Kuang 1 , Wen-Feng Lin 5 , Xiaoming Sun 1
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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 while "floating" the Janus electrode on the electrolyte. Antibuoyancy through-mesh bubble transportation was observed while immersing the electrode with the 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-fold higher current density than submerged states.
中文翻译：
具有不对称润湿性的Janus电极产生的浮力和单向气体逸出。
由气体逸出反应电化学生成的气泡通常通过浮力从电极上驱除，该浮力是用于克服气泡粘附障碍的弱力，导致气体传输效率低。在此，通过用具有良好平衡的疏水性的超疏水聚四氟乙烯（PTFE）和Pt / C（或Ir / C）催化剂改性多孔不锈钢网状电极的两侧，制备了具有不对称润湿性的Janus电极，在水分解过程中，生成的气态氢和氧从催化剂侧单向输送到集气侧。在将Janus电极“悬浮”在电解质上的同时，实现了“无气泡”电解。将电极浸入PTFE的一面朝下时，观察到了反渗透网状气泡的输送。电极内的可湿性梯度赋予了催化剂一侧气泡的粘性状态，从而实现了有效的无气泡气体传输，其电流密度比浸没状态高15倍。
更新日期：2020-04-29
中文翻译：
具有不对称润湿性的Janus电极产生的浮力和单向气体逸出。
由气体逸出反应电化学生成的气泡通常通过浮力从电极上驱除，该浮力是用于克服气泡粘附障碍的弱力，导致气体传输效率低。在此，通过用具有良好平衡的疏水性的超疏水聚四氟乙烯（PTFE）和Pt / C（或Ir / C）催化剂改性多孔不锈钢网状电极的两侧，制备了具有不对称润湿性的Janus电极，在水分解过程中，生成的气态氢和氧从催化剂侧单向输送到集气侧。在将Janus电极“悬浮”在电解质上的同时，实现了“无气泡”电解。将电极浸入PTFE的一面朝下时，观察到了反渗透网状气泡的输送。电极内的可湿性梯度赋予了催化剂一侧气泡的粘性状态，从而实现了有效的无气泡气体传输，其电流密度比浸没状态高15倍。
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