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Boosting the supercapacitive behavior of CoAl-layered double hydroxides via tuning the metal composition and interlayer space

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Boosting the supercapacitive behavior of CoAl-layered double hydroxides via tuning the metal composition and interlayer space

dc.contributor.author	Seijas-Da Silva, Alvaro
dc.contributor.author	Sanchis Gual, Roger
dc.contributor.author	Carrasco Andrés, José Alberto
dc.contributor.author	Oestreicher, Víctor
dc.contributor.author	Abellán Sáez, Gonzalo
dc.contributor.author	Coronado Miralles, Eugenio
dc.date.accessioned	2021-04-28T13:19:25Z
dc.date.available	2021-04-28T13:19:25Z
dc.date.issued	2020
dc.identifier.citation	Seijas-Da Silva, Alvaro Sanchis Gual, Roger Carrasco Andrés, Jose Alberto Oestreicher, Víctor Abellán Sáez, Gonzalo Coronado Miralles, Eugenio 2020 Boosting the supercapacitive behavior of CoAl-layered double hydroxides via tuning the metal composition and interlayer space Batteries & Supercaps 3 6 499 509
dc.identifier.uri	https://hdl.handle.net/10550/78961
dc.description.abstract	Layered double hydroxides (LDHs) are promising supercapacitor materials due to their wide chemical versatility, earth abundant metals and high specific capacitances. Many parameters influencing the supercapacitive performance have been studied such as the chemical composition, the synthetic approaches, and the interlayer anion. However, no systematic studies about the effect of the basal space have been carried out. Here, two-dimensional (2D) CoAl-LDHs were synthesized through anion exchange reactions using surfactant molecules in order to increase the interlayer space (ranging from 7.5 to 32.0 Å). These compounds exhibit similar size and dimensions but different basal space to explore exclusively the interlayer distance influence in the supercapacitive performance. In this line, Co:Al ratios of 2:1, 3:1 and 4:1 were explored. In all cases, an enhancement of the specific capacitance was observed by increasing the basal space, reaching ca. 50 % more than the value obtained from the less-spaced 2:1 CoAl-LDH (up to ca. 750 - 1100 F.g-1 at 1 A.g-1). This increment mainly occurs because of the increase in the electrochemical surface area (up to ca. 260 %) and the higher electrolyte diffusion. Interestingly, best performance is achieved for the lowest Co:Al ratio (i. e. the highest Al content) revealing the important role of the electrochemically inert Al in the structure.
dc.language.iso	eng
dc.relation.ispartof	Batteries & Supercaps, 2020, vol. 3, num. 6, p. 499-509
dc.subject	Materials
dc.subject	Energia
dc.title	Boosting the supercapacitive behavior of CoAl-layered double hydroxides via tuning the metal composition and interlayer space
dc.type	journal article	es_ES
dc.date.updated	2021-04-28T13:19:26Z
dc.identifier.doi	10.1002/batt.201900223
dc.identifier.idgrec	136227
dc.rights.accessRights	open access	es_ES