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Driving electrochemical membrane processes with coupled ionic diodes

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Autor(es):
Li, Zhongkai ; Mathwig, Klaus ; Arotiba, Omotayo A. ; Tshwenya, Luthando ; Neto, Evaldo Batista Carneiro ; Pereira, Ernesto Chaves ; Marken, Frank
Número total de Autores: 7
Tipo de documento: Artigo Científico
Fonte: CURRENT OPINION IN ELECTROCHEMISTRY; v. 39, p. 8-pg., 2023-04-11.
Resumo

Ionic diodes have emerged repeatedly in the literature for gel interfaces, for nanopores and channels, for nano-/micro-fluidic systems, and for asymmetrically ionomer-covered microholes. Concentration polarisation is likely to be the key to under-standing the diode function and the diode time constant tdiode, i.e. the time for approaching steady state following a potential/ polarity switch. For frequencies higher than udiode = 2pf = (tdiode)-1, the polarization mechanism is too slow for ion cur-rent rectification. Below the frequency associated with the diode time constant, irreversibility in ion flow is induced and the diode switches between two resistive states at opposite po-tentials ("open" and "closed"). The irreversible flow of ions allows energy conversion from electrical to electrochemical. For energy conversion, two coupled ionic diodes are neces-sary driven by alternating current (AC) electricity to minimise driver electrode electrolysis and energy losses. Opportunities for AC-desalination and for electroosmotic water harvesting with coupled ionic diodes are discussed. (AU)

Processo FAPESP: 21/03592-2 - Modelagem e simulação de dispositivos eletroquímicos por elementos finitos
Beneficiário:Evaldo Batista Carneiro Neto
Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
Processo FAPESP: 13/07296-2 - CDMF - Centro de Desenvolvimento de Materiais Funcionais
Beneficiário:Elson Longo da Silva
Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs
Processo FAPESP: 22/06229-9 - Transporte eletroosmótico retificado de fármacos
Beneficiário:Evaldo Batista Carneiro Neto
Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Pós-Doutorado