Effect of Hierarchical Porosity on PMo12Adsorption and Capacitance in Hybrid Carbon-PMo12Electrodes for Supercapacitors

Eduardo Fuentes-Quezada, Diana Cristina Martínez-Casillas, Ana Karina Cuentas Gallegos, Ezequiel De La Llave

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

Here, we report an industrially scalable synthetic strategy to develop efficient hybrid supercapacitor electrodes with practical mass loading (∼10 mg·cm-2), combining hierarchical mesoporous carbons (HMC) and phosphomolybdic acid, H3PMo12O40(PMo12). A thoughtful analysis on the relationship between the carbon structure and PMo12incorporation over a family of HMC-PMo12hybrid materials prepared from carbons with different textures revealed a preferential absorption of PMo12on small mesopores (∼5 nm). These findings challenge the widespread idea that micropores are the optimal choice for PMo12incorporation; as we have proved, small mesopores maximized PMo12adsorption, and this later ensured the proper electrolyte diffusion due to bigger interconnected mesopores (∼25 nm). Thus, on account of PMo12incorporation and improved electrolyte diffusion, the hybrid electrode capacitance exhibited a significant increase (up to 119%), observing an enhanced electron transport and improved rate capability performance. In terms of specific capacitance, our material outperforms all of the previously published carbon-polyoxometalate (POMs) systems with practical mass loading, reaching a value up to 326 F·g-1. Therefore, in this paper, we proposed the use of small carbon mesopores for optimal PMo12adsorption as a novel conceptual approach to develop a hierarchical mesoporous carbon-POM hybrid material, which proved to be an excellent candidate for electrodes in supercapacitors.

Original languageEnglish
Pages (from-to)3987-3996
Number of pages10
JournalEnergy and Fuels
Volume36
Issue number7
DOIs
StatePublished - 7 Apr 2022
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2022 American Chemical Society. All rights reserved.

Funding

The authors acknowledge the Laboratorio Nacional de Conversión y Almacenamiento de Energía (LNCAE) through project 279953 for the use of their facilities. E.d.l.L. acknowledges the financial support from ANPCyT (PICT 2017-2414) and CONICET (PIP 2021-2023 GI). E.F.-Q. thanks a Doctoral fellowship from CONICET. A.K.C.G. acknowledges CONACYT through project A1-S-13294 and DGAPA through project IA102820.

FundersFunder number
Agencia Nacional de Promoción Científica y Tecnológica

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