Mesoporous Hybrid Shells of Carbonized Polyaniline/Mn2O3 as Non-Precious Efficient Oxygen Reduction Reaction Catalyst

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• 作者：Shiyi Cao ; Na Han ; Jie Han ; Yimin Hu ; Lei Fan ; Chuanqiang Zhou ; Rong Guo
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：March 9, 2016
• 年：2016
• 卷：8
• 期：9
• 页码：6040-6050
• 全文大小：781K
• ISSN：1944-8252

文摘

Mesoporous hybrid shells of carbonized polyaniline (C_PANI)/Mn₂O₃ with well-controlled diameter and high surface area have been synthesized through surface protected calcination processes. Originating from polystyrene template, PANI, MnO₂, and SiO₂ were sequentially loaded, followed by template removal and calcination, resulting in the desired C_PANI/Mn₂O₃ hybrid shells. The introduction of SiO₂ shell was established to play the determining role in maintaining the configuration during calcination process under high temperature. The C_PANI/Mn₂O₃ hybrid shells showed outstanding electrocatalytic activity toward oxygen reduction reaction (ORR), with the onset potential at +0.974 V (versus RHE), the specific current at 60.8 mA/mg, and an overall quasi 4-electron transfer, which are comparable to those of the benchmark Pt/C. The remarkable ORR performance was attributed to the high specific surface area, the surface oxidation state of Mn, and composition-codependent behavior.