Energy harvesting in the course of acid solution neutralization
Tainá Ferreira, Bianca (Universidade de São Paulo. Departamento de Química)
Rueda García, Daniel (Institut Català de Nanociència i Nanotecnologia)
Gómez-Romero, Pedro 1959- (Institut Català de Nanociència i Nanotecnologia)
Huguenin, Fritz (Universidade de São Paulo. Departamento de Química)

Date:	2022
Abstract:	This work investigates electrodes consisting of phosphomolybdic acid/reduced graphene oxide (PMo/RGO) and copper hexacyanoferrate (CuHCF) for proton adsorption/desorption and alkali metal ion intercalation/deintercalation, respectively. These electrodes can be used to harvest the energy resulting from the difference in ion concentrations during acid solution neutralization. HPMoO clusters were uniformly anchored on RGO sheets to ensure large electrode surface area and to facilitate proton access to the polyoxometalate electroactive sites. On the other hand, compared to iron ions in Prussian Blue, copper ions in the hexacyanometalate structure provided higher potassium ion intercalation/deintercalation rate. The experiments were performed in the time and frequency domains, and thermodynamic and kinetic models were proposed to improve our understanding of how the electrochemical system behaves with respect to energy harvesting. The reactions presented low energy dissipation due to low charge transfer resistance and diffusion impedance. The predicted energy harvested by the electrochemical full cell was 13. 5 and 10. 7 kJ per mol of adsorbed proton at 0. 1 and 1. 0 mA cm in acidic (pH = 2) and slightly acidic (pH = 6) media, respectively, which included acetate buffer and the feedback of the saline solution resulting from neutralization. The electrodes used here provided increased energy harvesting and power density compared to other electrode materials employed for the same purposes. Indeed, energy harvesting from acidic wastewater treatment can be a profitable and sustainable practice mainly for industries that generate enormous amounts of wastewater.
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 sotmesa a revisió
Subject:	Acid solutions ; Acidic pH ; Adsorption/desorption ; Copper hexacyanoferrate ; Energy ; Intercalation/deintercalation ; Ion intercalation ; Neutralisation ; Phosphomolybdic acid ; Reduced graphene oxides
Published in:	Journal of Electroanalytical Chemistry, Vol. 927 (Dec. 2022) , art. 116957, ISSN 1572-6657

DOI: 10.1016/j.jelechem.2022.116957

Preprint 48 p, 3.9 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