Impact of oxidation state of metal on electro-catalyzed hydrogen production by cobalt complexes of N-phenylpyridin-2-ylmethanimine
| Autor: | Nan-Shu Wang, Chun-Li Wang, Shu-Zhong Zhan, Qian-Qian Cao, Jun-Zheng Zhan, Ze-Quan Liu |
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| Rok vydání: | 2021 |
| Předmět: |
Diffraction
Inorganic chemistry chemistry.chemical_element 010402 general chemistry 010403 inorganic & nuclear chemistry Electrochemistry 01 natural sciences 0104 chemical sciences Catalysis Metal Water soluble chemistry Oxidation state visual_art Materials Chemistry visual_art.visual_art_medium Physical and Theoretical Chemistry Cobalt Hydrogen production |
| Zdroj: | Journal of Coordination Chemistry. 74:864-876 |
| ISSN: | 1029-0389 0095-8972 |
| DOI: | 10.1080/00958972.2021.1884234 |
| Popis: | N-phenylpyridin-2-ylmethanimine, L, reacts with CoCl2·6H2O to form a water soluble complex, [CoIII(L)2Cl2]Cl, which has been determined by X-ray diffraction analysis. Electrochemical studies show that [CoIII(L)2Cl2]Cl can serve as an electrocatalyst for water or proton reduction to hydrogen from neutral water (pH 7.0) or acetic acid with a turnover frequency (TOF) of 1032.4 and 70.3 moles of hydrogen per mole of catalyst per hour (mol H2/mol catalyst/h) at an overpotential (OP) of 837.6 mV and 941.6 mV, respectively. Compared with the previously described cobalt(II) complex, [CoII(L)2Br2] (TOF: 875.17 mol H2/mol catalyst/h at an OP of 837.6 mV), the cobalt(III) complex, [CoIII(L)2Cl2]Cl exhibits more efficient activity for hydrogen evolution. This can be attributed to CoIII/CoII and CoII/CoI couples of [CoIII(L)2Cl2]Cl are responsible for hydrogen production. |
| Databáze: | OpenAIRE |
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