title: Hydrogen Oxidation-Selective Electrocatalysis by Fine Tuning of Pt Ensemble Sites to Enhance the Durability of Automotive Fuel Cells.
abstract: A simple, inexpensive approach is proposed for enhancing the durability of automotive proton exchange membrane fuel cells by selective promotion of the hydrogen oxidation reaction (HOR) and suppression of the oxygen reduction reaction (ORR) at the anode in startup/shutdown events. Dodecanethiol forms a self-assembled monolayer (SAM) on the surface of Pt particles, thus decreasing the number of Pt ensemble sites. Interestingly, by controlling the dodecanethiol concentration during SAM formation, the number of ensemble sites can be precisely optimized such that it is sufficient for the HOR but insufficient for the ORR. Thus, a Pt surface with an SAM of dodecanethiol clearly effects HOR-selective electrocatalysis. Clear HOR selectivity is demonstrated in unit cell tests with the actual membrane electrode assembly, as well as in an electrochemical three-electrode setup with a thin-film rotating disk electrode configuration.
authors.affiliation: School of Mechanical Engineering, Pusan National University, 2, Busandaehak-ro 63beon-gil, Geumjeong-gu, Busan, 46241, Korea.
authors.forename: Su-Won
authors.initials: SW
authors.lastname: Yun
authors.affiliation: School of Mechanical Engineering, Pusan National University, 2, Busandaehak-ro 63beon-gil, Geumjeong-gu, Busan, 46241, Korea.
authors.forename: Shin-Ae
authors.initials: SA
authors.lastname: Park
authors.affiliation: School of Mechanical Engineering, Pusan National University, 2, Busandaehak-ro 63beon-gil, Geumjeong-gu, Busan, 46241, Korea.|Defense Agency for Technology and Quality, Department of Busan, 3rdTeam, 3370, Geoje-daero, Geoje-si, Gyeongsangna-do, 53302, Korea.
authors.forename: Tae-June
authors.initials: TJ
authors.lastname: Kim
authors.affiliation: School of Mechanical Engineering, Pusan National University, 2, Busandaehak-ro 63beon-gil, Geumjeong-gu, Busan, 46241, Korea.|National Core Research Center for Hybrid Materials Solution, Pusan National University, 2, Busandaehak-ro 63beon-gil, Geumjeong-gu, Busan, 46241, Korea.
authors.forename: Jun-Hyuk
authors.initials: JH
authors.lastname: Kim
authors.affiliation: School of Mechanical Engineering, Pusan National University, 2, Busandaehak-ro 63beon-gil, Geumjeong-gu, Busan, 46241, Korea.
authors.forename: Gi-Woong
authors.initials: GW
authors.lastname: Pak
authors.affiliation: School of Mechanical Engineering, Pusan National University, 2, Busandaehak-ro 63beon-gil, Geumjeong-gu, Busan, 46241, Korea.
authors.forename: Yong-Tae
authors.identifier: 0000-0001-9232-6558
authors.initials: YT
authors.lastname: Kim
mesh_terms: D002384:Catalysis; D011211:Electric Power Supplies; D004563:Electrochemistry; D004566:Electrodes; D006859:Hydrogen / Q000737:chemistry*; D008958:Models, Molecular; D008968:Molecular Conformation; D010084:Oxidation-Reduction; D013438:Sulfhydryl Compounds / Q000737:chemistry
chemical_list: D013438:Sulfhydryl Compounds; C013976:dodecylmercaptan; D006859:Hydrogen
keywords: electrocatalysis; fuel cells; hydrogen oxidation; platinum; thiols