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Surfactant‐Assisted Phase‐Selective Synthesis of New Cobalt MOFs and Their Efficient Electrocatalytic Hydrogen Evolution Reaction
Author(s) -
Wu YaPan,
Zhou Wei,
Zhao Jun,
Dong WenWen,
Lan YaQian,
Li DongSheng,
Sun Chenghua,
Bu Xianhui
Publication year - 2017
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201707238
Subject(s) - tafel equation , cobalt , catalysis , chemistry , electrocatalyst , inorganic chemistry , pulmonary surfactant , molecule , chemical engineering , electrochemistry , electrode , organic chemistry , biochemistry , engineering
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 H 2 O 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 18 mV, low Tafel slope of 45 mV dec −1 , higher exchange current density of 8.6×10 −4 A cm −2 , and long‐term stability.