Self-terminated electrodeposition of platinum on titanium nitride for methanol oxidation reaction in acidic electrolyte Jinuk Byun a , Sang Hyun Ahn b,* , Jae Jeong Kim a,c,** a School of Chemical and Biological Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Republic of Korea b School of Chemical Engineering and Material Science, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 06974, Republic of Korea c School of Chemical and Biological Engineering, Institute of Chemical Process, Seoul National University, 1 Gwanak- ro, Gwanak-gu, Seoul, 08826, Republic of Korea highlights  Pt clusters was prepared on TiN using Pt self-terminated electrodeposition.  Pt loading mass was precisely controlled by repeating deposition potential pulse.  Pt/TiN demonstrated catalytic performance for methanol oxidation reaction.  The catalytic activities were maximized with a Pt loading mass of 55.0 mg/cm 2 . article info Article history: Received 10 December 2019 Received in revised form 22 January 2020 Accepted 25 January 2020 Available online xxx abstract The development of high-performance electrocatalysts for methanol oxidation is an urgent task to enhance the efficiency of direct methanol fuel cells. We report a simple and controllable method to fabricate Pt-decorated TiN electrocatalysts using self-terminated electrodeposition at room temperature and ambient pressure. Under optimized deposi- tion parameters such as electrolyte pH, TiN substrate pretreatment, and pulsed deposition potential, quenching of the Pt electrodeposition facilitates obtaining an extremely low Pt mass loading (0.93 mg/cm 2 ) on the TiN substrate. Repeated deposition potential pulses enable a gradual increase in Pt loading, with a precise control of the loaded Pt mass. Maximum intrinsic and mass activities for the methanol oxidation reaction are achieved for the catalyst with a Pt loading mass of 55.0 mg/cm 2 , prepared by 20 deposition pulses. The maximum intrinsic activity achieved with the Pt-decorated TiN electrocatalyst is five times higher than that obtained with bulk Pt. The present results thus provide a facile method for the fabrication of cost-effective electrocatalysts. © 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved. * Corresponding author. ** Corresponding author. School of Chemical and Biological Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Republic of Korea. E-mail addresses: shahn@cau.ac.kr (S.H. Ahn), jjkimm@snu.ac.kr (J.J. Kim). Available online at www.sciencedirect.com ScienceDirect journal homepage: www.elsevier.com/locate/he international journal of hydrogen energy xxx (xxxx) xxx https://doi.org/10.1016/j.ijhydene.2020.01.204 0360-3199/© 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved. Please cite this article as: Byun J et al., Self-terminated electrodeposition of platinum on titanium nitride for methanol oxidation re- action in acidic electrolyte, International Journal of Hydrogen Energy, https://doi.org/10.1016/j.ijhydene.2020.01.204