2026-08-22T00:39:43Zhttps://docta.ucm.es/rest/oai/request

oai:docta.ucm.es:20.500.14352/1250932025-10-21T00:07:53Zcom_20.500.14352_14col_20.500.14352_15

Enhancing Electrochemical Properties of Walnut ShellActivated Carbon with Embedded MnO Clusters forSupercapacitor Applications Arenas Esteban, Daniel García Chamocho, Elena Carretero González, Javier Urones Garrote, Esteban Otero Díaz, Luis Carlos Ávila Brande, David 54 Química 23 Química Activated carbon (AC) materials from renewable sources arewidely used in electrochemical applications due to their well-known high surface area. However, their application aselectrode material in double-layer electrochemical devices maybe limited due to their relatively low electrical conductivity andlightweight. To overcome these limitations, the incorporation ofpseudocapacitance metal oxide nanoparticles is an optimumapproach. These nanoparticles can provide a second energystorage mechanism to the composite, mitigating the loss ofsurface area associated with their incorporation. As a result, thecomposite material is endowed with increased conductivity andhigher density, making it more suitable for practical implemen-tation in real devices. In this study, we have incorporated a finedispersion of 1 % of MnO clusters into a highly porous activatedcarbon synthesized from walnut shells (WAC). The high-resolution electron microscopy studies, combined with theirrelated analytical techniques, allow us to determine thepresence of the cluster within the matrix carbon precisely. Theresulting MnO@WAC composite demonstrated significantlyimproved capacitive behavior compared with the WAC material,with increased volumetric capacitance and higher chargeretention at higher current densities. The composite‘s electro-chemical performance suggests its potential as a promisingelectrode material for supercapacitors, addressing drawbacksassociated with traditional AC materials. Agencia Estatal de Investigación Plan de Recuperación, Transformación y Resiliencia (PRTR) Ministerio de Ciencia, Innovación y Universidades Depto. de Química Inorgánica Fac. de Ciencias Químicas TRUE pub 2025-10-20T08:45:46Z 2025-10-20T08:45:46Z 2024-03-17 journal article VoR https://hdl.handle.net/20.500.14352/125093 XXXX-XXXX 10.1002/batt.202400101 eng PID2020-112848RB−C21 D. A. Esteban, E. G. Chamocho, J. Carretero González, E. Urones Garrote, L. C. Otero Díaz, D. Á. Brande, Batteries & Supercaps 2024, 7, e202400101. https://doi.org/10.1002/batt.202400101 open access application/pdf Wiley