title: Boron-doped diamond semiconductor electrodes: Efficient photoelectrochemical CO2reduction through surface modification.
abstract: Competitive hydrogen evolution and multiple proton-coupled electron transfer reactions limit photoelectrochemical CO2reduction in aqueous electrolyte. Here, oxygen-terminated lightly boron-doped diamond (BDDL) thin films were synthesized as a semiconductor electron source to accelerate CO2reduction. However, BDDLalone could not stabilize the intermediates of CO2reduction, yielding a negligible amount of reduction products. Silver nanoparticles were then deposited on BDDLbecause of their selective electrochemical CO2reduction ability. Excellent selectivity (estimated CO:H2mass ratio of 318:1) and recyclability (stable for five cycles of 3 h each) for photoelectrochemical CO2reduction were obtained for the optimum silver nanoparticle-modified BDDLelectrode at -1.1 V vs. RHE under 222-nm irradiation. The high efficiency and stability of this catalyst are ascribed to the in situ photoactivation of the BDDLsurface during the photoelectrochemical reaction. The present work reveals the potential of BDDLas a high-energy electron source for use with co-catalysts in photochemical conversion.
authors.affiliation: Photocatalysis International Research Center, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan.
authors.forename: Nitish
authors.initials: N
authors.lastname: Roy
authors.affiliation: Photocatalysis International Research Center, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan.|Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan.
authors.forename: Yuiri
authors.initials: Y
authors.lastname: Hirano
authors.affiliation: ORC Manufacturing Co., Ltd, 4896 Tamagawa, Chino, Nagano 391-0011, Japan.
authors.forename: Haruo
authors.initials: H
authors.lastname: Kuriyama
authors.affiliation: Environmental and Sustainability Institute, University of Exeter, Penryn, Cornwall TR10 9EZ, UK.
authors.forename: Pitchaimuthu
authors.initials: P
authors.lastname: Sudhagar
authors.affiliation: Photocatalysis International Research Center, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan.
authors.forename: Norihiro
authors.initials: N
authors.lastname: Suzuki
authors.affiliation: Photocatalysis International Research Center, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan.
authors.forename: Ken-Ichi
authors.initials: KI
authors.lastname: Katsumata
authors.affiliation: Photocatalysis International Research Center, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan.|Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan.
authors.forename: Kazuya
authors.initials: K
authors.lastname: Nakata
authors.affiliation: Photocatalysis International Research Center, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan.|Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan.
authors.forename: Takeshi
authors.initials: T
authors.lastname: Kondo
authors.affiliation: Photocatalysis International Research Center, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan.|Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan.
authors.forename: Makoto
authors.initials: M
authors.lastname: Yuasa
authors.affiliation: ORC Manufacturing Co., Ltd, 4896 Tamagawa, Chino, Nagano 391-0011, Japan.
authors.forename: Izumi
authors.initials: I
authors.lastname: Serizawa
authors.affiliation: Faculty of Science, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku, Tokyo 162-8601, Japan.
authors.forename: Tomoaki
authors.initials: T
authors.lastname: Takayama
authors.affiliation: Photocatalysis International Research Center, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan.|Faculty of Science, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku, Tokyo 162-8601, Japan.
authors.forename: Akihiko
authors.initials: A
authors.lastname: Kudo
authors.affiliation: Photocatalysis International Research Center, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan.
authors.forename: Akira
authors.initials: A
authors.lastname: Fujishima
authors.affiliation: Photocatalysis International Research Center, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan.
authors.forename: Chiaki
authors.initials: C
authors.lastname: Terashima