An anti-electrowetting carbon film electrode with self-sustained aeration for industrial H2O2 electrosynthesis

被引:37
作者
Cui, Lele [1 ,2 ]
Chen, Bin [3 ,4 ]
Zhang, Longshun [3 ]
He, Chen [3 ]
Shu, Chen [3 ]
Kang, Hongyu [1 ,2 ]
Qiu, Jian [3 ,4 ]
Jing, Wenheng [3 ]
Ostrikov, Kostya [5 ,6 ]
Zhang, Zhenghua [1 ,2 ,5 ,6 ]
机构
[1] Tsinghua Univ, Inst Environm & Ecol, Guangdong Prov Engn Res Ctr Urban Water Recycling, Tsinghua Shenzhen Int Grad Sch,Membrane & Nanotech, Shenzhen 518055, Peoples R China
[2] Tsinghua Univ, Sch Environm, Beijing 100084, Peoples R China
[3] Nanjing Tech Univ, State Key Lab Mat Oriented Chem Engn, 5 Xinmofan Rd, Nanjing 210009, Peoples R China
[4] Jiangsu ShuangLiang Environm Technol Co Ltd, Jiangyin 214400, Peoples R China
[5] Queensland Univ Technol QUT, Sch Chem & Phys, Brisbane, Qld 4000, Australia
[6] Queensland Univ Technol QUT, QUT Ctr Mat Sci, Brisbane, Qld 4000, Australia
基金
中国国家自然科学基金;
关键词
HYDROGEN-PEROXIDE; OXYGEN REDUCTION;
D O I
10.1039/d3ee03223j
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Electrochemical two-electron oxygen reduction represents a highly desirable and sustainable future strategy for the mass production of hydrogen peroxide (H2O2) for applications from large-scale chemical production to portable sanitation. However, the industrial translation of this process is challenged by poor selectivity and durability due to the damaging flooding of the reactive three-phase interface of air-diffusion electrodes by rapid electrowetting under high current density operation conditions. Here, we demonstrate a concept of an anti-electrowetting carbon film electrode with self-sustained aeration by structurally discontinuously fracturing conventional planar electrocatalyst films assembled using just commercially available carbon particles. The dense through-microcracks formed in the coating-fabricated carbon black-polytetrafluoroethylene active layer counterintuitively present robust underwater hydrophobicity. This allows self-driven diffusion of oxygen from open air to the active interface, while enabling electrodes to operate at industry-relevant current densities (100-300 mA cm(-2)) with unprecedented selectivity (>97%) and durability (>200 h) without failure. The demonstrated anti-electrowetting carbon film with self-sustained aeration is highly promising for developing next-generation cheap and scalable metal-free electrodes for industry-scale H2O2 electrosynthesis.
引用
收藏
页码:655 / 667
页数:13
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