Oxygen reduction reaction catalysts of manganese oxide decorated by silver nanoparticles for aluminum-air batteries

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• 作者：Shanshan Sun ; He Miao ; ^{miaohe@nimte.ac.cn" class="auth_mail" title="E-mail the corresponding author} ; Yejian Xue ; Qin Wang ; Shihua Li ; Zhaoping Liu ; ^{liuzp@nimte.ac.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Oxygen reduction reaction (ORR) ; Silver-manganese oxide ; Composite catalyst ; Aluminum-air batteries
• 刊名：Electrochimica Acta
• 出版年：2016
• 出版时间：1 October 2016
• 年：2016
• 卷：214
• 期：Complete
• 页码：49-55
• 全文大小：2782 K

文摘

In this paper, the hybrid catalysts of manganese oxide decorated by silver nanoparticles (Ag-MnO_x) are fully investigated and show the excellent oxygen reduction reaction (ORR) activity. The Ag-MnO₂ is synthesized by a facile strategy of the electroless plating of silver on the manganese oxide. The catalysts are characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). Then, the ORR activities of the catalysts are systematically investigated by the rotating disk electrode (RDE) and aluminum-air battery technologies. The Ag nanoparticles with the diameters at about 10 nm are anchored on the surface of α-MnO₂ and a strong interaction between Ag and MnO₂ components in the hybrid catalyst are confirmed. The electrochemical tests show that the activity and stability of the 50%Ag-MnO₂ composite catalyst (the mass ratio of Ag/MnO₂ is 1:1) toward ORR are greatly enhanced comparing with single Ag or MnO₂ catalyst. Moreover, the peak power density of the aluminum-air battery with 50%Ag-MnO₂ can reach 204 mW cm⁻².