title: Photoelectrochemical Reduction of Carbon Dioxide to Methanol through a Highly Efficient Enzyme Cascade.
abstract: Natural photosynthesis is an effective route for the clean and sustainable conversion of CO2into high-energy chemicals. Inspired by the natural process, a tandem photoelectrochemical (PEC) cell with an integrated enzyme-cascade (TPIEC) system was designed, which transfers photogenerated electrons to a multienzyme cascade for the biocatalyzed reduction of CO2to methanol. A hematite photoanode and a bismuth ferrite photocathode were applied to fabricate the iron oxide based tandem PEC cell for visible-light-assisted regeneration of the nicotinamide cofactor (NADH). The cell utilized water as an electron donor and spontaneously regenerated NADH. To complete the TPIEC system, a superior three-dehydrogenase cascade system was employed in the cathodic part of the PEC cell. Under applied bias, the TPIEC system achieved a high methanol conversion output of 220 μm h-1, 1280 μmol g-1h-1using readily available solar energy and water.
authors.affiliation: Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, 335 Science Road, Daejeon, 305-701, Republic of Korea.
authors.forename: Su Keun
authors.initials: SK
authors.lastname: Kuk
authors.affiliation: Department of Chemical Engineering, Konkuk University, 120 Neungdong-ro, Seoul, 143-701, Republic of Korea.
authors.forename: Raushan K
authors.initials: RK
authors.lastname: Singh
authors.affiliation: Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, 335 Science Road, Daejeon, 305-701, Republic of Korea.
authors.forename: Dong Heon
authors.initials: DH
authors.lastname: Nam
authors.affiliation: Department of Chemical Engineering, Konkuk University, 120 Neungdong-ro, Seoul, 143-701, Republic of Korea.
authors.forename: Ranjitha
authors.initials: R
authors.lastname: Singh
authors.affiliation: Department of Chemical Engineering, Konkuk University, 120 Neungdong-ro, Seoul, 143-701, Republic of Korea.
authors.forename: Jung-Kul
authors.initials: JK
authors.lastname: Lee
authors.affiliation: Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, 335 Science Road, Daejeon, 305-701, Republic of Korea.
authors.forename: Chan Beum
authors.identifier: 0000-0002-0767-8629
authors.initials: CB
authors.lastname: Park
mesh_terms: D002245:Carbon Dioxide / Q000737:chemistry / Q000378:metabolism*; D055664:Electrochemical Techniques; D000432:Methanol / Q000737:chemistry / Q000378:metabolism*; D008958:Models, Molecular; D010084:Oxidation-Reduction; D010088:Oxidoreductases / Q000737:chemistry / Q000378:metabolism*; D055668:Photochemical Processes
chemical_list: D002245:Carbon Dioxide; D010088:Oxidoreductases; D000432:Methanol
keywords: CO2 reduction; biocatalysis; enzymes; methanol production; photosynthesis