title: Single-Atom Catalyst of Platinum Supported on Titanium Nitride for Selective Electrochemical Reactions.
abstract: As a catalyst, single-atom platinum may provide an ideal structure for platinum minimization. Herein, a single-atom catalyst of platinum supported on titanium nitride nanoparticles were successfully prepared with the aid of chlorine ligands. Unlike platinum nanoparticles, the single-atom active sites predominantly produced hydrogen peroxide in the electrochemical oxygen reduction with the highest mass activity reported so far. The electrocatalytic oxidation of small organic molecules, such as formic acid and methanol, also exhibited unique selectivity on the single-atom platinum catalyst. A lack of platinum ensemble sites changed the reaction pathway for the oxygen-reduction reaction toward a two-electron pathway and formic acid oxidation toward direct dehydrogenation, and also induced no activity for the methanol oxidation. This work demonstrates that single-atom platinum can be an efficient electrocatalyst with high mass activity and unique selectivity.
authors.affiliation: Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology, 291, Daehak-ro, Yuseong-gu, Daejeon, 34141, Republic of Korea.
authors.forename: Sungeun
authors.initials: S
authors.lastname: Yang
authors.affiliation: Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology, 291, Daehak-ro, Yuseong-gu, Daejeon, 34141, Republic of Korea.
authors.forename: Jiwhan
authors.initials: J
authors.lastname: Kim
authors.affiliation: Department of Material Science and Engineering, Yonsei University, 50, Yonsei-ro, Seodaemun-gu, Seoul, 03722, Republic of Korea.
authors.forename: Young Joo
authors.initials: YJ
authors.lastname: Tak
authors.affiliation: Department of Material Science and Engineering, Yonsei University, 50, Yonsei-ro, Seodaemun-gu, Seoul, 03722, Republic of Korea.
authors.forename: Aloysius
authors.initials: A
authors.lastname: Soon
authors.affiliation: Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology, 291, Daehak-ro, Yuseong-gu, Daejeon, 34141, Republic of Korea. azhyun@kaist.ac.kr.
authors.forename: Hyunjoo
authors.initials: H
authors.lastname: Lee
keywords: electrocatalysis; platinum; selectivity; single-atom catalysts; titanium nitride