纳米笼
材料科学
多孔性
合并(版本控制)
化学工程
原位
纳米尺度
催化作用
纳米技术
相(物质)
扩散
化学
复合材料
热力学
有机化学
工程类
物理
计算机科学
情报检索
作者
Liangping Xiao,Guanghua Wang,Xingchen Huang,Shiyuan Zhou,Rusen Zhou,Youhong Jiang,Sangui Liu,Gen Li,Haimei Zheng,Shi‐Gang Sun,Hong‐Gang Liao
标识
DOI:10.1016/j.apcatb.2022.121164
摘要
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 ℃ under inhibited diffusion conditions, which exhibits excellent catalytic performance on CO2 reduction reaction.
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