Journal
CERAMICS INTERNATIONAL
Volume 47, Issue 5, Pages 6121-6129Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2020.10.191
Keywords
Manganese oxides; Hydrothermal; Supercapacitors; 3-Hydroxytyramine hydrochloride; 3, 4-dihydroxybenzenepropanoic acid
Categories
Funding
- National Natural Science Foundation of China [21601073]
- Natural Science Foundation of Jiangsu province [SBK2017021988]
- Applied Basic Research Project of Qinghai Province Science and Technology Department [2020-ZJ-737]
- Lanzhou University-Xi 'an Jiaotong University-Northwestern Polytechnical University-Jinchuan Group Chemical Co. LTD Industrial Joint Laboratory for Chemical and Environmental Engineering
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The crystal form, morphology, and size of manganese oxides were controlled by adjusting the concentration of two special catechol-structured short-chain surfactants. Amongst the synthesized materials, nanoflower-like delta-MnO2 exhibited the highest specific capacitance at a scan rate of 5 mV s(-1).
We successfully synthesized nanoflower-like delta-MnO2, rod-shaped MnOOH, nano-small granular Mn3O4, and the cuboidal and spindle shaped MnCO3 via a facile one-pot hydrothermal method by adjusting the concentration of two sorts of short-chain surfactants with special catechol structures (3-Hydroxytyramine hydrochloride (DA) and 3,4-dihydroxybenzenepropanoic acid (DHCA)) in KMnO4 solution. The XRD and FTIR data demonstrated that the crystal form, morphology and size of the crystal were controlled by small molecule ligands. Afterwards, the relationship between manganese oxides and electrochemical properties was further explored. The results illustrated that nanoflower-like delta-MnO2 with layer structures have the highest specific capacitance of 307.4 F g(-1) at a scan rate of 5 mV s(-1).
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