Efficient CO2 reduction MOFs derivatives transformation mechanism revealed by in-situ liquid phase TEM

Wang, Guanghua ¹Huang, Xingchen ¹Zhou, Shiyuan ¹Zhou, Rusen ¹Jiang, Youhong ¹Liu, Sangui ¹Li, Gen ¹Xiao, Liangping ¹Zheng, Haimei ²Sun, Shi-Gang ¹Liao, Hong-Gang¹

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作者信息

1. Xiamen Univ
2. Lawrence Berkeley Natl Lab
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Abstract

Materials derived from MOFs have great potentials in energy conversion. However, the nanoscale transformation processes of MOFs derivatives remain unknown. Herein, by using in-situ liquid phase TEM, we directly visualize the MOFs etching processes. For the first time, unexpected nanobubble stability controlled transformation mechanism of ZIF-67 to porous or layered cobalt transition metal hydroxide (Co-TMH) is identified. Voids in MOFs migrate and merge to form nanobubbles due to structural collapse. Under slow diffusion conditions, nanobubbles move slowly and Co-TMH clusters generate on the nanobubble interface, further favoring the formation of internal nanocages and porous structures. On the other hand, a fast diffusion leads to rapid nanobubbles generation, aggregation and reshaping, inducing layered structure formation. Inspired by in-situ observation, we further synthesize porous Co-TMH at -80 degrees C under inhibited diffusion conditions, which exhibits excellent catalytic performance on CO2 reduction reaction.

Key words

in-situ liquid phase TEM/Transformation mechanism/MOFs-based derivative/CO2 reduction reaction/METAL-ORGANIC FRAMEWORKS/LAYERED DOUBLE HYDROXIDE/HIGH-PERFORMANCE/CONVERSION/DIFFUSION/GROWTH/ELECTROCATALYSTS/TRANSITION/NANOCAGES/STORAGE

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出版年

2022

Applied Catalysis

ISSN：0926-3373

被引量5

参考文献量59

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