Journal
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Volume 637, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.colsurfa.2021.128228
Keywords
Hierarchical hollow microsphere; beta-MnO2; Hydrothermal; Self-templated process; Oxygen reduction reaction
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Funding
- National Natural Science Foundation of China [21576054, 21905054]
- Guangdong Provincial Key Laboratory of Plant Resources Biorefinery [2021B121204011]
- Natural Science Foundation of Guangdong Province [2018A030310563, 2019B1515120087]
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In this study, hierarchical hollow beta-MnO2 microspheres assembled by nanorod subunits were successfully fabricated using a one-step hydrothermal approach. The reaction temperature and H2SO4 concentration were found to influence the crystalline phase and morphology of the products. The hollow beta-MnO2 microspheres were formed through a self-templated process by phase transformation. Compared with commercial beta-MnO2 particles, the hollow microspheres exhibited superior ORR performance.
Herein, hierarchical hollow beta-MnO2 microspheres assembled by nanorod subunits are facilely fabricated using a one-step hydrothermal approach, which serve as electrocatalyst for oxygen reduction reaction (ORR). The influences of the reaction temperature and H2SO4 concentration on the crystalline phase and morphology of products are studied. Impressively, detailed characterizations reveal that the hollow beta-MnO2 microspheres can be formed through a self-templated process by phase transformation, in which solid gamma-MnO2 microspheres are first generated and then convert to hollow beta-MnO2 microspheres. Owing to their unique hollow shape and robust O-2 adsorption ability, the hollow beta-MnO2 microspheres show superior ORR performance (a more positive half-wave potential of similar to 0.69 V, a larger limiting current density of 5.04 mA cm(-1), and better stability) compared with commercial beta-MnO2 particles. The insights afforded in this study offer positive guidance for the rational design of hollow Mn-based materials.
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