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Correspondence to Author: Yuda Afdhal, Anand Kumar, Ibrahim Abu Reesh, Christopher K. Russell, Jeffrey T. Miller,Mohammed Ali Saleh Saad, Mohammed J. Al-Marri. 

University of Mainz, Mainz, Germany.

Abstract: We synthesized silver-based electrocatalysts (Ag/C, AgCo/C, and AgNi/C) using solution combustion and evaluated their efficacy in the methanol oxidation reaction. Detailed structural and microscopic examination revealed the production of graphitic carbon and crystalline phases with substantial porosity in all three electrocatalysts. X-ray photoelectron spectroscopy (XPS) study revealed a high concentration of Ag2O (or Ag+) on AgNi/C, while AgCo/C had a high concentration of AgO (or Ag2+) on its surface. XPS study of C 1s revealed the largest concentrations of the sp2 hybridized C C bond on Ag/C, C O on AgNi/C, and O C O bond on AgCo/C, respectively. X-ray absorption spectroscopy (XAS) study of Ag edges revealed similar bond lengths between AgCo and this means there is no Ag-M alloying. However, there was a considerable variation in particle sizes between AgNi and AgCo, measuring 2.5 and 6 nm, respectively. In methanol electrooxidation trials, AgNi/C electrocatalysts outperformed AgCo/C and Ag/C. Linear sweep voltammetry (LSV) studies revealed that AgNi/C outperformed other materials with an onset potential of 0.41 V. A 20-hour chronoamperometry experiment verified the better performance of the AgNi/C catalyst. This might be attributed to reduced particle size and Ag+ stabilization on the catalytic surface.

Citation:

Yuda Afdhal.Electrooxidation Of Methanol On Ag, Agni, And Agco Catalysts Synthesized Using Combustion Method. Journal Of Energy Research 2025.