Ni 2 Mn-layered double oxide electrodes in organic electrolyte based supercapacitors.

Autor: Hong J; Chemistry Research Laboratory, Department of Chemistry, University of Oxford 12 Mansfield Road Oxford OX1 3TA UK dermot.ohare@chem.ox.ac.uk., Chen C; Chemistry Research Laboratory, Department of Chemistry, University of Oxford 12 Mansfield Road Oxford OX1 3TA UK dermot.ohare@chem.ox.ac.uk., Siriviriyanun A; SCG Chemicals Co., Ltd. 1 Siam Cement Rd, Bangsue Bangkok 10800 Thailand., Crivoi DG; Chemistry Research Laboratory, Department of Chemistry, University of Oxford 12 Mansfield Road Oxford OX1 3TA UK dermot.ohare@chem.ox.ac.uk., Holdway P; Department of Materials, University of Oxford Parks Road Oxford OX1 3PH UK., Buffet JC; Chemistry Research Laboratory, Department of Chemistry, University of Oxford 12 Mansfield Road Oxford OX1 3TA UK dermot.ohare@chem.ox.ac.uk., O'Hare D; Chemistry Research Laboratory, Department of Chemistry, University of Oxford 12 Mansfield Road Oxford OX1 3TA UK dermot.ohare@chem.ox.ac.uk.
Jazyk: angličtina
Zdroj: RSC advances [RSC Adv] 2021 Aug 10; Vol. 11 (44), pp. 27267-27275. Date of Electronic Publication: 2021 Aug 10 (Print Publication: 2021).
DOI: 10.1039/d1ra04681k
Abstrakt: The development of future mobility ( e.g. electric vehicles) requires supercapacitors with high voltage and high energy density. Conventional active carbon-based supercapacitors have almost reached their limit of energy density which is still far below the desired performance. Advanced materials, particularly metal hydroxides/oxides with tailored structure are promising supercapacitor electrodes to push the limit of energy density. To date, research has largely focused on evaluation of these materials in aqueous electrolyte, while this may enable high specific capacitance, it results in low working voltage window and poor cycle stability. Herein, we report the development of Ni 2 Mn-layered double oxides (Ni 2 Mn-LDOs) as mixed metal oxide-based supercapacitor electrodes for use in an organic electrolyte. Ni 2 Mn-LDO obtained by calcination of [Ni 0.66 Mn 0.33 (OH) 2 ](CO 3 ) 0.175 · n H 2 O at 400 °C produced the best performing Ni 2 Mn-LDOs with high working voltage of 2.5 V and a specific capacitance of 44 F g -1 (at 1 A g -1 ). We believe the performance of the Ni 2 Mn-LDOs is related to its unique porous structure, high surface area and the homogeneous mixed metal oxide network. Ni 2 Mn-LDO outperforms both the single metal oxides (NiO, MnO 2 ) and the equivalent physical mixture of the two oxides. We propose this performance boost arises from synergy between NiO and MnO x due to a more effective homogeneous network of NiO/MnO x domains in the Ni 2 Mn-LDO. This work clearly shows the advantage of an LDO over the single component metal oxides as well as the physical mixture of mixed metal oxides and highlights the possibilities of development of further mixed metal oxides-based supercapacitors in organic electrolyte using LDH precursors.
Competing Interests: There are no conflicts to declare.
(This journal is © The Royal Society of Chemistry.)
Databáze: MEDLINE
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