Chemically Deposited Cobalt‐Based Oxygen‐Evolution Electrocatalysts on DOPA‐Displaying Viruses. Issue 1 (23rd November 2017)

• Record Type: Journal Article
• Authors: Rho, Jihun; Lim, Sung Yul; Hwang, Inseong; Yun, Jeongse; Chung, Taek Dong
• Is Part Of: ChemCatChem. Volume 10:Issue 1(2018)
• Page Start: 165
• Page End: 169
• Publication Date: 2017-11-23
• Subjects: cobalt -- dopamines -- electrochemistry -- oxygen -- water splitting; Catalysis -- Periodicals; 541.39505
• DOI: 10.1002/cctc.201701111
• Languages: English
• ISSNs: 1867-3880

Abstract

Abstract: Filamentous bacteriophages were engineered to display 3, 4‐dihydroxy‐l ‐phenylalanine (DOPA) onto which a cobalt oxide based oxygen‐evolution catalyst (Co‐OEC) spontaneously deposited at room temperature. Relative to the electrodeposited Co‐OEC, the catalyst formed on the virus exhibited improved durability and current density in a small overpotential region, as well as decreased oxidation states for the formation of Co(OH)2, as confirmed by electrochemical and X‐ray photoelectron spectroscopy analysis. Chemically deposited Co(OH)2 on the virus was oxidized to CoOOH during the water‐oxidation process. Thus, the DOPA‐displaying virus illustrates the affordability of a genetically engineered bacteriophage as a molecular support that can improve the catalytic performance of inorganic materials without any additional electrical energy. Abstract : Time to split : Filamentous bacteriophages are genetically engineered to express DOPA on the surface of the major coat protein. A cobalt oxide based oxygen evolution catalyst (Co‐OEC) is deposited onto the DOPA‐displaying phages by simply immersing the phages in precursor solutions that contain Co 2+ . The oxygen evolution reaction activity of the Co‐OEC‐deposited phages is investigated by drop casting on the electrode.