Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 60, Issue 9, Pages 4747-4755Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202010618
Keywords
anisotropic etching; electrocatalysis; hollow nanoframes; hydrogen evolution reaction; metal-organic frameworks
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Funding
- JST-CREST program [JPMJCR1524]
- KAKENHI [JP16H02293, JP17H06220]
- National Natural Science Foundation of China [22075201, 51972227]
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A facile anisotropic surface modification and etching strategy is proposed for the synthesis of hollow structured ZIF-67 nanoframes. The strategy utilizes structural and compositional distinctions between crystallographic facets to selectively etch the nanoframes, resulting in high catalytic activities and stabilities in the hydrogen evolution reaction.
A facile anisotropic surface modification and etching strategy is presented for the synthesis of hollow structured ZIF-67 nanoframes. The strategy uses structural and compositional distinctions between each crystallographic facet of truncated rhombic dodecahedrons ZIF-67 (tZIF-67 RDs) and the moderate coordinating and etching effects of cyanuric acid (CA). The CA can anisotropically modify and protect the {110} facets from etching, causing the six {100} facets be selectively etched via an inside-out manner, and finally forming the hollow nanoframes. The surface-modified hollow tZIF-67 RDs can be facet-selectively etched by metal salts in an outside-in manner to give metal-doped tZIF-67 nanoframes. After calcination, the metal-tZIF-67 hybrids are converted into metal-Co alloy/C composite catalysts with hollow nanoframed structures. The PtCo/C catalyst with only 5.9 wt % Pt exhibits high catalytic activities and stabilities in the hydrogen evolution reaction (HER) in acidic solutions.
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