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| Type |
Poster Presentation |
| Area |
Inorganic Chemistry |
| Room No. |
Exhibition Hall 2+3 |
| Time |
10월 19일 (목요일) 11:00~12:30 |
| Code |
INOR.P-35 |
| Subject |
Electrochemical Hydrogen Production with New Cyclopentadienyl Rhodium(III) Complexes |
| Authors |
Jinheung Kim*, Soojin Kim, Yu Jeong Jeon1, Yun Jin Leem1
Chemistry Department of Nano-Science, Ewha Womans University, Korea
1Department of Chemistry and Nano Science, Ewha Womans University, Korea
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| Abstract |
Two new molecular rhodium(III) catalysts was investigated in the electrocatalytic activity for a hydrogen evolution system in the presence of a proton source using glassy carbon electrodes in acetonitrile and water. Rhodium complexes supported by pbi and pbt ligands, i.e., [Cp*Rh(pbt)Cl](PF6) (1) and [Cp*Rh(pbi)Cl] (2) (where Cp* is pentamethylcyclopentadienyl, pbt is 2-(2’-pyridyl)benzothiazole, and pbi is 2-(2’-pyridyl)benzimidazole), were observed to electrocatalytically evolve H2 at potential of -0.90 V vs Ag/AgCl in CH3CN and CH3CN/H2O. Cyclic voltammetry of 1 and 2 in the presence of acid revealed redox waves consistent with the Rh(III)/Rh(I) couple. Bulk electrolysis were used to confirm the catalytic nature of the process for complexes 1 and 2, with turnover numbers in excess of 100 and essentially quantitative faradaic yields for H2 production. The potentials at which these Rh complexes catalyzed H2 evolution were close to the thermodynamic potentials for the production of H2 from protons in CH3CN and CH3CN/H2O, with the small overpotential being 50 mV for 1 as determined by electrochemistry. The complex 1 with more positive Rh(III/I) redox potentials exhibited higher activity for H2 production. |
| E-mail |
jinheung@ewha.ac.kr |
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120th General Meeting of the KCS