Arenas Esteban, DanielGarcía Chamocho, ElenaCarretero González, JavierUrones Garrote, EstebanOtero Díaz, Luis CarlosÁvila Brande, David2025-10-202025-10-202024-03-17D. 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.20240010110.1002/batt.202400101https://hdl.handle.net/20.500.14352/125093Activated 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.engjournal articlehttps://doi.org/10.1002/batt.202400101https://chemistry-europe.onlinelibrary.wiley.com/doi/epdf/10.1002/batt.202400101open access54Química23 Química