title: Biologically inspired pteridine redox centres for rechargeable batteries.
abstract: The use of biologically occurring redox centres holds a great potential in designing sustainable energy storage systems. Yet, to become practically feasible, it is critical to explore optimization strategies of biological redox compounds, along with in-depth studies regarding their underlying energy storage mechanisms. Here we report a molecular simplification strategy to tailor the redox unit of pteridine derivatives, which are essential components of ubiquitous electron transfer proteins in nature. We first apply pteridine systems of alloxazinic structure in lithium/sodium rechargeable batteries and unveil their reversible tautomerism during energy storage. Through the molecular tailoring, the pteridine electrodes can show outstanding performance, delivering 533 Wh kg(-1) within 1 h and 348 Wh kg(-1) within 1 min, as well as high cyclability retaining 96% of the initial capacity after 500 cycles at 10 A g(-1). Our strategy combined with experimental and theoretical studies suggests guidance for the rational design of organic redox centres.
authors.affiliation: Department of Materials Science and Engineering, Research Institute of Advanced Materials (RIAM), Seoul National University, 1 Gwanak Road, Seoul 151-742, Republic of Korea.
authors.forename: Jihyun
authors.initials: J
authors.lastname: Hong
authors.affiliation: Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), 335 Science Road, Daejeon 305-701, Republic of Korea.
authors.forename: Minah
authors.initials: M
authors.lastname: Lee
authors.affiliation: Department of Materials Science and Engineering, Research Institute of Advanced Materials (RIAM), Seoul National University, 1 Gwanak Road, Seoul 151-742, Republic of Korea.
authors.forename: Byungju
authors.initials: B
authors.lastname: Lee
authors.affiliation: Department of Materials Science and Engineering, Research Institute of Advanced Materials (RIAM), Seoul National University, 1 Gwanak Road, Seoul 151-742, Republic of Korea.
authors.forename: Dong-Hwa
authors.initials: DH
authors.lastname: Seo
authors.affiliation: Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), 335 Science Road, Daejeon 305-701, Republic of Korea.
authors.forename: Chan Beum
authors.initials: CB
authors.lastname: Park
authors.affiliation: 1] Department of Materials Science and Engineering, Research Institute of Advanced Materials (RIAM), Seoul National University, 1 Gwanak Road, Seoul 151-742, Republic of Korea [2] Center for Nanoparticle Research, Institute for Basic Science (IBS), Seoul National University, 1 Gwanak Road, Seoul 151-742, Republic of Korea.
authors.forename: Kisuk
authors.initials: K
authors.lastname: Kang
mesh_terms: D001674:Bioelectric Energy Sources; D004566:Electrodes; D005415:Flavins / Q000737:chemistry*; D008094:Lithium / Q000737:chemistry; D010084:Oxidation-Reduction; D011621:Pteridines / Q000737:chemistry; D012964:Sodium / Q000737:chemistry
chemical_list: D005415:Flavins; D011621:Pteridines; C001559:7,8-dimethylalloxazine; D008094:Lithium; D012964:Sodium