Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 56, Issue 42, Pages 13001-13005Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201707238
Keywords
cobalt; composite materials; electrocatalysis; hydrogen evolution reaction; MOFs
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Funding
- NSF of China [21673127, 21373122, 21671119, 51572152, 51502155]
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Reported herein are two new polymorphic Co-MOFs (CTGU-5 and -6) that can be selectively crystallized into the pure 2D or 3D net using an anionic or neutral surfactant, respectively. Each polymorph contains a H2O molecule, but differs dramatically in its bonding to the framework, which in turn affects the crystal structure and electrocatalytic performance for hydrogen evolution reaction (HER). Both experimental and computational studies find that 2D CTGU-5 which has coordinates water and more open access to the cobalt site has higher electrocatalytic activity than CTGU-6 with the lattice water. The integration with co-catalysts, such as acetylene black (AB) leads to a composite material, AB&CTGU-5 (1:4) with very efficient HER catalytic properties among reported MOFs. It exhibits superior HER properties including a very positive onset potential of 18mV, low Tafel slope of 45mVdec(-1), higher exchange current density of 8.6x10(-4)Acm(-2), and long-term stability.
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