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Water-soluble binuclear aquo Cu(ii) complex with an amide ligand as an electrocatalyst for the OER, HER and CO2RR
Md Adnan Khan1, Sonal Shruti1, Swaraj Sengupta2
1Department of Chemistry, Birla Institute of Technology-Mesra Ranchi India subhendu@bitmesra.ac.in.
Abstract:
A dinuclear copper complex (1) with the formula Cu2L2 (where L = [3-((pyridin-2-ylmethyl)carbamoyl)isonicotinic acid]) was synthesized and characterized by single-crystal XRD and mass spectrometry. The complex showed a high order of electrocatalytic hydrogen evolution reaction (HER) and carbon dioxide reduction reaction (CO2RR) activity in acidic media, along with a moderate oxygen evolution reaction (OER) activity in the pH range of 7 to 13.5. The efficiency of 1 for the HER was calculated as follows: TOF = 1679 s-1, TON = 586 and F.E. = 83% in 56 equivalents of perchloric acid. For the CO2RR, a TOF value of 4 h-1, a TON of 18 and an F.E. of 92% were observed, with a percentage selectivity of ∼99.99% for CO2 to (COOH)2. The best water oxidation activity was accomplished at pH 13.5 with the following electroanalytical efficacy parameters: TOF = 9 s-1 (peak current method), TOFFOWA = 31 s-1, TON = 66 and F.E. = 84%. The high stability of the molecular catalyst was analyzed through CV, FESEM, EDX and DLS.
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