Manganese oxide with hollow rambutan-like morphology as highly efficient electrocatalyst for oxygen evolution reaction

• Published in: Journal of solid state electrochemistry Vol. 22; no. 10; pp. 2999 - 3007
• Main Authors: Liu, Ping-Ping, Li, Ting-Ting, Zhu, Hong-Lin, Zheng, Yue-Qing
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.10.2018; Springer Nature B.V
• Subjects: Analytical Chemistry; Carbon; Characterization and Evaluation of Materials; Chemistry; Chemistry and Materials Science; Condensed Matter Physics; Electrochemistry; Electrolysis; Energy Storage; Manganese dioxide; Manganese oxides; Morphology; Nanowires; Original Paper; Oxygen evolution reactions; Physical Chemistry; Reaction time; Hollow three-dimensional; Oxygen evolution reaction; Rambutan-like; Manganese oxide
• ISSN: 1432-8488; 1433-0768
• DOI: 10.1007/s10008-018-4014-z

The research about oxygen evolution reaction (OER) has attracted extensive attention. In this work, different manganese oxides with different shell thickness were firstly grown on the surface of carbon ball template, and then the carbon ball was removed by high-temperature calcination in air to obtain hollow rambutan-like Mn 2 O 3 and MnO 2 –Mn 2 O 3 with long nanowires. The concentration of inorganic manganese salt and the reaction time has a determining influence on the morphologies of manganese oxide. The as-prepared MnO 2 –Mn 2 O 3 exhibits a lower overpotential than the Mn 2 O 3 to achieve a current density of 10 mA cm −2 . The Faradic efficiency of MnO 2 –Mn 2 O 3 reaches to 94.1% during the bulk electrolysis, and the morphology of MnO 2 –Mn 2 O 3 remains virtually unchanged after electrolysis, indicating the outstanding stability of the as-obtained MnO 2 –Mn 2 O 3 .