title: Fabrication of a biofuel cell improved by the π-conjugated electron pathway effect induced from a new enzyme catalyst employing terephthalaldehyde.
abstract: A model explaining the π-conjugated electron pathway effect induced by a novel cross-linker adopted enzyme catalyst is suggested and the performance and stability of an enzymatic biofuel cell (EBC) adopting the new catalyst are evaluated. For this purpose, new terephthalaldehyde (TPA) and conventional glutaraldehyde (GA) cross-linkers are adopted on a glucose oxidase (GOx), polyethyleneimine (PEI) and carbon nanotube (CNT)(GOx/PEI/CNT) structure. GOx/PEI/CNT cross-linked by TPA (TPA/[GOx/PEI/CNT]) results in a superior EBC performance and stability to other catalysts. It is attributed to the π bonds conjugated between the aldehyde of TPA and amine of the GOx/PEI molecules. By π conjugation, electrons bonded with carbon and nitrogen are delocalized, promoting the electron transfer and catalytic activity with an excellent EBC performance. The maximum power density (MPD) of an EBC adopting TPA/[GOx/PEI/CNT] (0.66 mW cm(-2)) is far better than that of the other EBCs (the MPD of EBC adopting GOx/PEI/CNT is 0.40 mW cm(-2)). Regarding stability, the covalent bonding formed between TPA and GOx/PEI plays a critical role in preventing the denaturation of GOx molecules, leading to an excellent stability. By repeated measurements of the catalytic activity, TPA/[GOx/PEI/CNT] maintains its activity to 92% of its initial value even after five weeks.
authors.affiliation: Graduate school of Energy and Environment, Seoul National University of Science and Technology, 232 Gongneung-ro, Nowon-gu, Seoul, 139-743, Republic of Korea. kwony@seoultech.ac.kr.
authors.forename: Yongjin
authors.initials: Y
authors.lastname: Chung
authors.affiliation: Graduate school of Energy and Environment, Seoul National University of Science and Technology, 232 Gongneung-ro, Nowon-gu, Seoul, 139-743, Republic of Korea. kwony@seoultech.ac.kr.
authors.forename: Kyu Hwan
authors.initials: KH
authors.lastname: Hyun
authors.affiliation: Graduate school of Energy and Environment, Seoul National University of Science and Technology, 232 Gongneung-ro, Nowon-gu, Seoul, 139-743, Republic of Korea. kwony@seoultech.ac.kr.
authors.forename: Yongchai
authors.initials: Y
authors.lastname: Kwon
mesh_terms: D000327:Adsorption; D000447:Aldehydes / Q000737:chemistry*; D000588:Amines / Q000737:chemistry; D001547:Benzaldehydes / Q000737:chemistry*; D001674:Bioelectric Energy Sources; D002384:Catalysis; D003432:Cross-Linking Reagents / Q000737:chemistry; D004563:Electrochemistry / Q000379:methods; D004583:Electrons; D004798:Enzymes / Q000737:chemistry; D005947:Glucose / Q000737:chemistry; D005949:Glucose Oxidase / Q000737:chemistry; D005976:Glutaral / Q000737:chemistry; D008239:Lysine / Q000737:chemistry; D037742:Nanotubes, Carbon / Q000737:chemistry; D010084:Oxidation-Reduction; D011094:Polyethyleneimine / Q000737:chemistry; D017550:Spectroscopy, Fourier Transform Infrared
chemical_list: D000447:Aldehydes; D000588:Amines; D001547:Benzaldehydes; D003432:Cross-Linking Reagents; D004798:Enzymes; D037742:Nanotubes, Carbon; D011094:Polyethyleneimine; D005949:Glucose Oxidase; D005947:Glucose; D008239:Lysine; D005976:Glutaral