Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 45, Issue 11, Pages 6447-6460Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2019.12.176
Keywords
PtxIr/MWCNT; MOR intrinsic activity; Bi-functional effect; Lattice strain; CO poisoning tolerance
Categories
Funding
- National Key Research and Development Program of China [2018YFE0121200]
- National Natural Science Foundation of China [21676126]
- Natural Science Foundation of Jiangsu Province [BK20171296]
- Key RD project [GY2018024]
- High-tech Research Key Laboratory of Zhenjiang City [SS2018002]
- China Postdoctoral Science Foundation [2019M661751]
- Jiangsu Province Postdoctoral Fund [2019K187]
- Priority Academic Program Development (PAPD) of Jiangsu Higher Education Institutions
- Research Fund Program of Key Laboratory of Fuel Cell Technology of Guangdong Province
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Development of highly active and durable Pt based anode materials with higher utilization of Pt is quite crucial towards the commercial viability of direct methanol fuel cells (DMFCs). Herein, multi-walled carbon nanotube supported PtxIr nanostructures (PtxIr/MWCNT) are successfully prepared by one-pot wet chemical reduction without any surfactants. The role of Ir content and its bi-functional mechanism on kinetics of methanol oxidation reaction (MOR) was studied. The MOR on PtxIr/MWCNT follows Langmuir-Hinshelwood mechanism by successive oxidative removal of CO. The co-existence of IrO2 plays a vital role as catalytic promotor. Amongst, Pt2Ir/MWCNT shows enhanced electrocatalytic activity (mass activity (MA), 933.3 mA/mg(pt)) and durability (13.8% loss of MA after 5000 potential cycles) thru the well-balanced electronic and bi-functional effects. This study implies that the optimized composition of Pt2Ir/MWCNT exhibits efficient methanol oxidation and could be a potential catalyst for direct methanol fuel cells. (C) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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