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| Structure-Activity Relationship of Three-Dimensional Urchin-like MnO2 Microspheres with Different Crystalline Phases for Oxygen Reduction Reaction |
| Author Name | Affiliation | E-mail | | CHEN Li-Ya | School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, China | | | CHENG Gao | School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, China | | | LIU Guan-Liang | School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, China | | | HAN Jia-Xi | School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, China | | | FU Shu-Chai | School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, China | | | HAN Sheng-Bo | School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, China | | | SUN Ming | School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, China | | | LAN Bang | School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, China | | | YU Lin | School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, China | gych@gdut.edu.cn |
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| Abstract: Urchin-like MnO2 microspheres with three different crystalline phases (α, γ and β) were prepared by hydrothermal and calcination methods, and the oxygen reduction reaction (ORR) properties were systematically studied. The results of electrocatalytic tests indicated that the ORR activities of these three MnO2 microspheres followed a sequence:α-MnO2 > γ-MnO2 > β-MnO2. The α-MnO2 sample exhibited the best electrocatalytic performance towards ORR with an onset potential of 0.92 V (vs RHE) and a potential of 0.77 V (vs RHE) at -3 mA·cm-2. The superior ORR activity of urchin-like α-MnO2 microspheres was mainly related to the larger amount of Mn3+, more surface oxygen vacancies and better conductivity. Specially, the Mn3+ could promote the dissociation of O-O bond and conduce to one-electron transfer to adsorbed oxygen, thereby accelerating the exchange of O22-/OH- that regarded as the rate-limiting step of the ORR. |
| Keywords: oxygen reduction reaction urchin-like MnO2 microspheres structure-activity relationships electrochemistry |
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| CHEN Li-Ya,CHENG Gao,LIU Guan-Liang,HAN Jia-Xi,FU Shu-Chai,HAN Sheng-Bo,SUN Ming,LAN Bang,YU Lin.Structure-Activity Relationship of Three-Dimensional Urchin-like MnO2 Microspheres with Different Crystalline Phases for Oxygen Reduction Reaction[J].Chinese Journal of Inorganic Chemistry,2020,36(3):458-466. |
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