Co-sputtered Pt_xPd_yAl_z thin film electrocatalysts for the production of hydrogen via SO₂(aq) electro-oxidation

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• 作者：A. Falch ; V. A. Badets ; C. Labrugère ; R. J. Kriek
• 关键词：SO2 electro ; oxidation ; Hydrogen production ; Electrocatalyst ; High ; throughput screening
• 刊名：Electrocatalysis
• 出版年：2016
• 出版时间：September 2016
• 年：2016
• 卷：7
• 期：5
• 页码：376-390
• 全文大小：10,795 KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Catalysis
  Electrochemistry
  Physical Chemistry
  Energy Technology
  
• 出版者：Springer New York
• ISSN：1868-5994
• 卷排序：7

文摘

A co-sputtered Pt_xPd_yAl_z ternary system was investigated for potential use as anode catalyst for the electro-oxidation of aqueous sulphur dioxide (SO₂), a key reaction in the hybrid sulphur (HyS) process for splitting water into hydrogen and oxygen. Combining the noble metals Pt and Pd with Al resulted in no significant improvement in onset potential; however, current output was improved for the majority of the electrocatalysts evaluated. Of these electrocatalysts, only a single ternary composition exhibited improved stability when compared to pure Pt. It was found that a combination of Pt₄₀Pd₅₇Al₃ (annealed at 900 °C) exhibited superior performance when compared to pure Pt and the previously determined best binary electrocatalyst, i.e. Pt₃Pd₂. Current density (mA.mg Pt−1) increased from 108.11 to 181.21 and finally to 396.73 for Pt, Pt₃Pd₂ and Pt₄₀Pd₅₇Al₃, respectively, indicating an increase in activity that correlates with a decrease in Pt content. Atomic force microscopy (AFM) revealed an increase in surface roughness for Pt, Pt₃Pd₂ and Pt₄₀Pd₅₇Al₃, while the occurrence of metal interaction and certain degrees of Al migration (a result of annealing) was confirmed for Pt₄₀Pd₅₇Al₃ by X-ray photoelectron spectroscopy (XPS) and X-ray diffraction analysis (XRD).