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Effects of halogen ligands of complexes supported by bis(methylthioether)pyridine on catalytic activities for electrochemical and photochemical driven hydrogen evolution
Author(s) -
Wang ChunLi,
Yang Hao,
Du Juan,
Zhan ShuZhong
Publication year - 2021
Publication title -
applied organometallic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 71
eISSN - 1099-0739
pISSN - 0268-2605
DOI - 10.1002/aoc.6201
Subject(s) - chemistry , catalysis , electrochemistry , overpotential , photosensitizer , photochemistry , pyridine , quantum yield , disproportionation , aqueous solution , hydrogen production , ascorbic acid , photocatalysis , inorganic chemistry , medicinal chemistry , organic chemistry , electrode , fluorescence , physics , food science , quantum mechanics
Reactions of bis(methylthioether)pyridine (btep) with CuX 2 (X = Br and Cl) form two new complexes, [Cu(btep)Br 2 ] and [Cu(btep)Cl 2 ], respectively, which have been determined by X‐ray crystallography. Both of them can serve as catalysts for electrochemical and photochemical driven hydrogen evolution. Under an overpotential (OP) of 837.6 mV, [Cu(btep)Br 2 ] or [Cu(btep)Cl 2 ] can electrocatalyze hydrogen evolution from a neutral water with a turnover frequency (TOF) of 373 and 120 mol of hydrogen per mole of catalyst per hour (mol H 2 /mol catalyst/h), respectively. Under blue light, mixing with CdS nanorods (CdS NRs) as a photosensitizer, and ascorbic acid (H 2 A) as a sacrificial electron donor, the photolysis of an aqueous solution (pH 4.5) with [Cu(btep)Br 2 ] or [Cu(btep)Cl 2 ] can provide 6180 and 5120 mol of H 2 per mole of catalyst (mol of H 2 (mol of cat) −1 ) during 48‐h irradiation with an average apparent quantum yield of 16.7% and 11.0%, respectively. The results show that [Cu(btep)Br 2 ] shows a more efficient activity for H 2 generation than [Cu(btep)Cl 2 ]. Several electrochemical and photochemical measurements and analysis are carried out to study catalytic mechanism for H 2 production.