电催化剂
催化作用
介孔材料
电解
分解水
纳米尺度
材料科学
纳米技术
钌
电解水
纳米
化学物理
化学工程
氢
工作(物理)
扩散
纳米结构
大规模运输
化学
电极
电化学
热力学
物理化学
物理
工程物理
工程类
复合材料
电解质
光催化
有机化学
生物化学
作者
Zhenhui Liu,Yue Du,Ruohan Yu,Mingbo Zheng,Rui Hu,Jingsong Wu,Yongyao Xia,Zechao Zhuang,Dingsheng Wang
标识
DOI:10.1002/anie.202212653
摘要
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.
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