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New PtMg Alloy with Durable Electrocatalytic Performance for Oxygen Reduction Reaction in Proton Exchange Membrane Fuel Cell
- New PtMg Alloy with Durable Electrocatalytic Performance for Oxygen Reduction Reaction in Proton Exchange Membrane Fuel Cell
- Tetteh, Emmanuel Batsa; Lee, Ha-Young; Shin, Cheol-Hwan; Kim, Seung-hoon; Ham, Hyung Chul; Tran, Thanh Nhan; Jang, Jue-Hyuk; Yoo, Sung Jong; Yu, Jong-Sung
- DGIST Authors
- Yu, Jong-Sung
- Issue Date
- ACS Energy Letters, 5(5), 1601-1609
- Article Type
- PLATINUM; CATALYSTS; NANOPARTICLES; STABILITY; SURFACE; ELECTROREDUCTION; ADSORPTION; PARAMETERS; MAGNESIUM; ALKALINE
- Polycrystalline alloy electrodes of Pt with alkaline earth metals (Ca, Sr, and Ba) have been shown to exhibit enhanced electrocatalytic performance for oxygen reduction reaction (ORR) relative to Pt electrodes. The large oxophilicity of the alkaline earth metals makes it challenging to synthesize such alloys. Here, we synthesize a carbon-supported platinum-magnesium (PtMg) alloy with enhanced catalytic activity and durability for the ORR in both a half-cell and single cell when compared to the state-of-the-art Pt/C catalyst. Employing metallic Mg powder as a precursor can overcome the large oxophilicity of Mg and induce alloying of Mg with Pt, whereas conventional Mg salts do not form an alloy. Density functional theory calculations elucidate the origin of the enhanced catalytic activity and durability. Complementary physical and electrochemical analyses also evidence them in this work. This material holds great application potential and will contribute to elucidation of the effects of alloying Pt with electropositive metals.
- American Chemical Society
- Related Researcher
Light, Salts and Water Research Group
Materials chemistry; nanomaterials; electrochemistry; carbon and porous materials; fuel cell; battery; supercapacitor; sensor and photochemical catalyst
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- Department of Energy Science and EngineeringLight, Salts and Water Research Group1. Journal Articles
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