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Electrocatalytic Hydrogen Evolution and Hydrogen Oxidation with a Ni(PS)2 Complex

Journal Article · · European Journal of Inorganic Chemistry
Tetra-coordinate NiII and ZnII complexes employing the PS chelates 2-(diphenylphosphanyl)benzenethiol (HL1) and 2-(diisopropylphosphanyl)benzenethiol (HL2) have been synthesized and characterized by spectroscopic, structural, and electrochemical methods. All complexes were screened for electrocatalytic activity for hydrogen evolution with acetic acid and hydrochloric acid and hydrogen oxidation in the presence of triethylamine. The nickel complex Ni(L1)2 (1) was found to reduce protons from external acids to generate hydrogen with a turnover frequency of 140 s–1 at an overpotential of 1.1 V and cleave dihydrogen using redox active base triethylamine (Et3N) with a turnover frequency of 23 s–1 at an overpotential of 0.33 V. Ni(L2)2 (3) was also found to be an active catalyst for dihydrogen oxidation, but inefficient for proton reduction due to inaccessible Ni (II/I) reduction in the potential window. Zn(L1)2 (2) and Zn(L2)2 (4) complexes were found to be inadequate for their electrocatalytic behaviour towards both the reactions.
Research Organization:
Univ. of Louisville, KY (United States)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC)
Grant/Contract Number:
FG02-08CH11538
OSTI ID:
1533163
Alternate ID(s):
OSTI ID: 1377932
Journal Information:
European Journal of Inorganic Chemistry, Journal Name: European Journal of Inorganic Chemistry Journal Issue: 31 Vol. 2017; ISSN 1434-1948
Publisher:
ChemPubSoc EuropeCopyright Statement
Country of Publication:
United States
Language:
English

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