Surfactant-Assisted Phase-Selective Synthesis of New Cobalt MOFs and Their Efficient Electrocatalytic Hydrogen Evolution Reaction
Autor: | Ya-Qian Lan, Chenghua Sun, Dongsheng Li, Ya-Pan Wu, Xianhui Bu, Wen-Wen Dong, Jun Zhao, Wei Zhou |
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Rok vydání: | 2017 |
Předmět: |
Tafel equation
Materials science Inorganic chemistry Exchange current density chemistry.chemical_element General Medicine 02 engineering and technology General Chemistry Carbon black Crystal structure 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Catalysis 0104 chemical sciences Chemical engineering chemistry Pulmonary surfactant Molecule 0210 nano-technology Cobalt |
Zdroj: | Angewandte Chemie (International ed. in English). 56(42) |
ISSN: | 1521-3773 |
Popis: | 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 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. |
Databáze: | OpenAIRE |
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