Rational design of defect-rich tungsten-molybdenum oxide modified carbon supported Pd as superior performances electrocatalyst for formic acid oxidation. (26th April 2022)

• Record Type: Journal Article
• Authors: Li, Jianding; Fu, Yang; Xie, Jianping; Jia, Xibei; Kang, Yao; Zhang, Linfeng
• Is Part Of: International journal of hydrogen energy. Volume 47:Number 35(2022)
• Page Start: 15742
• Page End: 15752
• Publication Date: 2022-04-26
• Subjects: Fuel cell -- Formic acid oxidation -- Pd-based electrocatalyst -- Tungsten-molybdenum oxide -- Defects; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2022.03.069
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: A novel defect-rich tungsten-molybdenum oxide modified carbon support (WMO x -C) is prepared by adsorption and calcination of mixed heteropolyacids on Vulcan XC-72 carbon. The Pd/WMO x -C and Pd/C catalysts are fabricated by the liquid reduction method. Results show that the Pd/WMO x -C exhibits a more even distribution and smaller particle size. Electrochemical measurements demonstrate that the Pd/WMO x -C presents superior electrocatalytic performances and stability than that of Pd/C. The mass activity and specific oxidation activity of Pd/WMO x -C are 3.04 and 1.89 times as those of Pd/C, respectively. In addition, the negatively shifted CO-stripping peak (59 mV than Pd/C), enhanced stability and lower charge transfer resistance value are observed for Pd/WMO x -C. The improvement of electrocatalytic performances of Pd/WMO x -C catalyst may be assigned to the uniformly dispersed Pd with smaller particle size, electronic tuning of Pd by WMO x, rapid change of the oxidation state of molybdenum with the redox couples Mo 5+ /Mo 6+ and resultant defects of Pd/WMO x -C. Highlights: The defective Pd/WMO x -C catalyst was fabricated for formic acid oxidation. The adding of WMO x greatly improves the electrocatalytic activity and stability. The mechanism of enhanced electrocatalytic performance for Pd/WMO x -C is discussed. The formation of redox couples of Mo 5+ /Mo 6+ is effective in removal of COads .