Frontiers in Energy
>> 2018,
Volume 12,
Issue 4
doi:
10.1007/s11708-018-0586-7
RESEARCH ARTICLE
A perspective on the promoting effect of Ir and Au on Pd toward the ethanol oxidation reaction in alkaline media
1. Institute of Fuel Cells, School of Mechanical Engineering, MOE Key Laboratory of Power & Machinery Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
2. SJTU-Paris Tech Elite Institute of Technology, Shanghai Jiao Tong University, Shanghai 200240, China |
Accepted: 2018-09-13
Available online: 2018-12-21
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Abstract
There remain great challenges in developing highly efficient electrocatalysts with both high activity and good stability for the ethanol oxidation reaction in alkaline media. Herein, two architectures of tri-metallic PdIrAu/C electrocatalysts are designed and the promoting effect of Au and Ir on Pd toward the ethanol oxidation reaction (EOR) in alkaline media is investigated in detail. On the one hand, the tri-metallic Pd Au Ir/C electrocatalyst with a solid solution alloy architecture is less active relative to Pd Ir/C and Pd/C while the stabilizing effect of Au leads to both a higher activity and a lower degradation percentage after 3000 cycles of the accelerated degradation test (ADT) on Pd Au Ir/C than those on Pd Ir/C. On the other hand, the tri-metallic Pd Ir@(1/3Au)/C electrocatalyst with a near surface alloy architecture delivers a much higher activity with an improvement up to 50.4% compared to Pd Ir/C. It is speculated that for the tri-metallic Pd Ir@(1/3Au)/C electrocatalyst, certain Au atoms are well designed on surfaces to introduce an electronic modification, thus leading to an anti-poisoning effect and improving the EOR activity.
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