Electrosynthesis of dendritic palladium supported on Ti/TiO2NTs/Ni/CeO2 as high-performing and stable anode electrocatalyst for methanol electrooxidation |
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Affiliation: | 1. CAS Key Laboratory of Soft Matter Chemistry, Collaborative Innovation Center of Chemistry for Energy Materials, School of Chemistry and Material Science, University of Science and Technology of China, Hefei, 230026, PR China;2. School of Chemistry and Material Engineering, Huainan Normal University, Huainan, 232038, PR China |
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Abstract: | Liquid-fueled direct methanol fuel cell (DMFC) is highly promising for low-carbon transportation, but is hindered by high cost and short lifespan of conventional Pt-based electrocatalysts. Herein, we propose a new Pt-free catalyst strategy to exploit high-performing and stable electrocatalyst of DMFC, achieving enhanced electrocatalytic activity and high stability for methanol oxidation reaction (MOR) in alkaline media. A new Pt-free anode catalysts consisting of titanium/reduced-titanium dioxide nanotubes/nickel/cerium dioxide (Ti/r-TiO2NTs/Ni/CeO2) nanosupport and uniformly-dispersed Pd dendrites is successfully prepared by a facile three-step electrodeposition route without applying any template or surfactant. Noticeably, the as-prepared Ti/r-TiO2NTs/Ni/CeO2–Pd as an anode electrode exhibits superior activity than commercial Pd/C and other electrodes. The obtained large mass activity for Ti/r-TiO2NTs/Ni/CeO2–Pd electrode is 1752 mA mgPd?1 for MOR. After successive CV tests of 1000 cycles, Ti/r-TiO2NTs/Ni/CeO2–Pd electrode still retained 88.9% of its initial current. The superior performance of Ti/r-TiO2NTs/Ni/CeO2–Pd attributes to the large surface area and excellent conductivity, as well as the synergistic effects among nanosupport and Pd dendrites. Therefore, this study will open a new door for high-performance fuel cell applications. |
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Keywords: | Dendritic palladium Electrocatalyst Electrocatalytic activity Methanol electrooxidation |
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