Rational design of MXene/activated carbon/polyoxometalate triple hybrid electrodes with enhanced capacitance for organic-electrolyte supercapacitors
Zhu, Jun-Jie (Institut Català de Nanociència i Nanotecnologia)
Hemesh, Avireddy (Institut de Recerca en Energia de Catalunya)
Jacas Biendicho, Jordi (Institut de Recerca en Energia de Catalunya)
Martinez-Soria, Luis (Institut Català de Nanociència i Nanotecnologia)
Rueda García, Daniel (Institut Català de Nanociència i Nanotecnologia)
Morante, Joan Ramon (Universitat de Barcelona. Facultat de Física)
Ballesteros, Belén (Institut Català de Nanociència i Nanotecnologia)
Gómez-Romero, Pedro 1959- (Institut Català de Nanociència i Nanotecnologia)

Date:	2022
Abstract:	We report a triple hybrid electrode (MXene/activated carbon (AC)/polyoxometalates (POMs)) combining the merits of three materials: MXene (high volumetric capacitance), AC (high gravimetric capacitance) and Phosphotungstate (fast redox). Phosphotungstic acid (HPW12) and tetraethylammonium phosphotungstate (TEAPW12) were the two POMs used to prepare MXene/AC/POMs triple hybrids. MXene/AC/TEAPW12 outperformed MXene/AC/HPW12 in 1 M tetraethylammonium tetrafluoroborate (TEABF4)/acetonitrile. Nano-dispersion of POMs facilitates charge storage through surface capacitive processes (91% at 2 mV s). MXene/AC/TEAPW12 delivered significantly higher gravimetric capacitance (87F g at 1 mV s) than MXene (40F g at 1 mV s) in the same organic electrolyte, without sacrificing much volumetric capacitance (less than 10%). The gravimetric capacitance of the triple hybrid was similar to that of MXene/AC, whereas its volumetric capacitance was 1. 5 times higher. Replacing TEA cations with 1-ethyl-3-methylimidazolium cations (EMIM), the capacitance improved by 21%. Coupled with AC positive electrodes in an asymmetric cell, MXene/AC/TEAPW12 delivered 4. 6 times higher gravimetric energy density and 3. 5 times higher volumetric energy density than a similar MXene asymmetric cell at relatively high-power densities. This study proves that MXene/AC/TEAPW12 combines the merits and compensates for the demerits of each component and is a promising electrode material for organic-electrolyte supercapacitors.
Grants:	Agencia Estatal de Investigación RTI2018-099826-B-I00 Agencia Estatal de Investigación SEV-2017-0706 Agència de Gestió d'Ajuts Universitaris i de Recerca 2017/SGR-1246 Agència de Gestió d'Ajuts Universitaris i de Recerca 2017/SGR-00870
Note:	Altres ajuts: ICN2 and IREC are funded by the CERCA programme / Generalitat de Catalunya, and ICN2. This work has been carried out within the framework of doctoral program (PhD) of Material Science (Department of Physics) of Universitat Autònoma de Barcelona (UAB).
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, i la comunicació pública de l'obra, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original. No es permet la creació d'obres derivades.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Subject:	Hybrid electroactive materials ; MXene ; Polyoxometalates ; Organic ; Supercapacitors
Published in:	Journal of colloid and interface science, Vol. 623 (Oct. 2022) , p. 947-961, ISSN 1095-7103

DOI: 10.1016/j.jcis.2022.04.170

15 p, 4.9 MB

The record appears in these collections:
Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > Catalan Institute of Nanoscience and Nanotechnology (ICN2)
Articles > Research articles
Articles > Published articles