Self-terminated electrodeposition of platinum on titanium nitride for methanol oxidation reaction in acidic electrolyte |
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| Affiliation: | 1. School of Chemical and Biological Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Republic of Korea;2. School of Chemical Engineering and Material Science, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 06974, Republic of Korea;3. School of Chemical and Biological Engineering, Institute of Chemical Process, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Republic of Korea;1. School of Integrative Engineering, Chung-Ang University, 84 Heukseokno, Dongjak-gu, Seoul 06974, Republic of Korea;2. Department of Chemical Engineering, Hankyong National University, Anseong-si, Gyeonggi-do 17579, Republic of Korea;1. Department of Chemical Technology, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand;2. The Polytechnic School, Ira A. Fulton Schools of Engineering, Arizona State University, Mesa, AZ 85212, USA;3. Center of Excellence on Petrochemical and Materials Technology, Chulalongkorn University, Bangkok 10330, Thailand;4. Research Unit of Advanced Materials for Energy Storage, Chulalongkorn University, Bangkok 10330, Thailand;1. School of Integrative Engineering, Chung-Ang University, 84 Heukseokno, Dongjak-gu, Seoul 06974, Republic of Korea;2. Electrochemistry Department, Korea Institute of Materials Science, 797 Changwondaero, Seongsangu, Changwon, Gyeongnam 51508, Republic of Korea;3. Fuel Cell Research Center, Korea Institute of Science and Technology (KIST), 14-gil 5 Hwarangno, Seongbuk-gu, Seoul 02792, Republic of Korea;4. School of Chemical Engineering and Materials Science, Chung-Ang University, 84 Heukseokno, Dongjak-gu, Seoul 06974, Republic of Korea;1. Shandong Peninsula Engineering Research Center of Comprehensive Brine Utilization, Weifang University of Science and Technology, Shouguang, Weifang, 262700, China;2. School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, Guangdong, 510006, China;3. Key Laboratory of Fuel Cell Technology of Guangdong Province, Guangzhou 510640, China;4. Key Laboratory of Material Chemistry for Energy Conversion and Storage (Ministry of Education), Hubei Key Laboratory of Material Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology (HUST), 1037 Luoyu Road, Wuhan 430074, China;1. School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, China;2. School of Pharmacy, Guilin Medical University, Guilin, Guangxi, 541199, China;3. State Key Laboratory of Marine Resource Utilization in South China Sea, School of Chemical Engineering and Technology, Hainan University, Haikou 570228, PR China;4. Department of Chemical Systems Engineering, Graduate School of Engineering, Nagoya University, Nagoya, 464-8603, Japan |
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| 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 deposition 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 μg/cm2) 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 μg/cm2, 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. |
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