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- Title
Tuning Mass Transport in Electrocatalysis Down to Sub‐5 nm through Nanoscale Grade Separation.
- Authors
Liu, Zhenhui; Du, Yue; Yu, Ruohan; Zheng, Mingbo; Hu, Rui; Wu, Jingsong; Xia, Yongyao; Zhuang, Zechao; Wang, Dingsheng
- Abstract
Nano and single‐atom catalysis open new possibilities of producing green hydrogen (H2) by water electrolysis. However, for the hydrogen evolution reaction (HER) which occurs at a characteristic reaction rate proportional to the potential, the fast generation of H2 nanobubbles at atomic‐scale interfaces often leads to the blockage of active sites. Herein, a nanoscale grade‐separation strategy is proposed to tackle mass‐transport problem by utilizing ordered three‐dimensional (3d) interconnected sub‐5 nm pores. The results reveal that 3d criss‐crossing mesopores with grade separation allow efficient diffusion of H2 bubbles along the interconnected channels. After the support of ultrafine ruthenium (Ru), the 3d mesopores are on a superior level to two‐dimensional system at maximizing the catalyst performance and the obtained Ru catalyst outperforms most of the other HER catalysts. This work provides a potential route to fine‐tuning few‐nanometer mass transport during water electrolysis.
- Subjects
WATER electrolysis; HYDROGEN evolution reactions; MESOPORES; RUTHENIUM catalysts; CATALYSIS; ELECTROCATALYSIS
- Publication
Angewandte Chemie, 2023, Vol 135, Issue 3, p1
- ISSN
0044-8249
- Publication type
Article
- DOI
10.1002/ange.202212653