Vitamin B12‐Immobilized Graphene Oxide for Efficient Electrocatalytic Carbon Dioxide Reduction Reaction. Issue 21 (14th October 2020)

• Record Type: Journal Article
• Authors: Saravanan, Natarajan; Balamurugan, Mani; Shalini Devi, K. S.; Nam, Ki Tae; Senthil Kumar, Annamalai
• Is Part Of: ChemSusChem. Volume 13:Issue 21(2020)
• Page Start: 5620
• Page End: 5624
• Publication Date: 2020-10-14
• Subjects: aqueous medium -- CO2 reduction reaction -- electrocatalytic -- environmentally friendly -- vitamin B12; Green chemistry -- Periodicals; Sustainable engineering -- Periodicals; Chemistry -- Periodicals; Chemical engineering -- Periodicals; 660
• DOI: 10.1002/cssc.202001378
• Languages: English
• ISSNs: 1864-5631

Abstract

Abstract: A naturally occurring water‐soluble cobalt‐complex cyanocobalamin (Vitamin B12) has been identified as a new and efficient electrocatalyst for the CO2 ‐to‐CO reduction reaction in aqueous solution. Heterogeneous B12‐electrocatalysts prepared by a simple electrochemical immobilization technique on graphene‐oxide (GO)‐modified glassy carbon and carbon paper (CP) electrodes, without any non‐degradable polymer‐binders, showed a highly stable and well‐defined surface‐confined redox peak at E '=−0.138 V vs. RHE with a surface‐excess value, Γ B12 =4.28 nmol cm −2 . This new electrocatalyst exhibits 93 % Faradaic efficiency for CO2 ‐to‐CO conversion at an electrolysis potential, −0.882 V vs. RHE (an optimal condition) with a high current density, 29.4 mA cm −2 and turn‐over‐frequency value, 5.2 s −1, without any surface‐fouling problem, in 0.5 m KHCO3 . In further, it follows an eco‐friendly, sustainable and water‐based approach with the involvement of biodegradable and non‐toxic chemicals/materials like B12, GO and CP. Abstract : Nature‐for‐nature : A naturally occurring and eco‐friendly cobalt complex, cyanocobalamin (vitamin B12)‐modified graphene oxide has been identified for the first time as an efficient electrocatalyst for CO2 ‐to‐CO conversion in aqueous solution.