Highly Dispersed Ag-Functionalized Graphene Electrocatalyst for Oxygen Reduction Reaction in Energy-Saving Electrolysis of Sodium Carbonate

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• 作者：Bao Men ; Yanzhi Sun ; Yang Tang ; Linying Zhang ; Yongmei Chen ; Pingyu Wan ; Junqing Pan
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2015
• 出版时间：August 5, 2015
• 年：2015
• 卷：54
• 期：30
• 页码：7415-7422
• 全文大小：582K
• ISSN：1520-5045

文摘

In this paper, Ag-Functionalized graphene electrocatalyst was prepared by simultaneous reduction of Ag[(NH₃)₂]⁺ and graphene oxide (GO) under the protection of Poly Diallyldimethylammonium Chloride. The as-prepared catalyst was utilized to enhance the catalytic activity toward oxygen reduction reaction (ORR) in energy-saving electrolysis of Na₂CO₃. The morphology characterization indicates that Ag nanoparticles uniformly disperse on the surface of reduced graphene oxide (RGO), and their average size is only about 5.7 nm. The electrochemical tests show that the as-prepared catalyst exhibits high electrocatlytic activity for ORR in alkaline media. Furthermore, when the catalyst is used for the oxygen reduction cathode (ORC) in the galvanostatic electrolysis of Na₂CO₃, the cell voltage can be reduced by 1.05 V, as compared with the conventional hydrogen evolution cathode (HEC) electrolysis. Correspondingly, up to 41.5% electrical energy consumption is saved at the same current density of 100 mA cm^鈥?.