Modification of the surface of activated carbon electrodes for capacitive mixing energy extraction from salinity differences

JOURNAL OF COLLOID AND INTERFACE SCIENCE

卷:436

Article

Marino, M.¹  Misuri, L.¹  Jimenez, M. L.²  Ahualli, S.^1,2  Kozynchenko, O.³  Tennison, S.³  Bryjak, M.⁴  Brogioli, D.¹ 

[1] Univ Milano Bicocca, Dipartimento Sci Salute, I-20900 Monza, MB, Italy

[2] Univ Granada, Sch Sci, Dept Appl Phys, E-18071 Granada, Spain

[3] MAST Carbon Int Ltd Jays Close, Basingstoke RG22 4BA, Hants, England

[4] Politechn Wrocklawska, PL-50370 Wroclaw, Poland

关键词: Energy from salinity difference;    Surface groups;    Capacitive mixing;    Electric double layer;    Gouy-Chapman-Stern model;   

DOI  :  10.1016/j.jcis.2014.08.070

来源: Elsevier

【 摘 要 】

The capacitive mixing (CAPMIX) is one of the techniques aimed at the extraction of energy from the salinity difference between sea and rivers. It is based on the rise of the voltage between two electrodes, taking place when the salt concentration of the solution in which they are dipped is changed. We study the rise of the potential of activated carbon electrodes in NaCl solutions, as a function of their charging state. We evaluate the effect of the modification of the materials obtained by adsorption of charged molecules. We observe a displacement of the potential at which the potential rise vanishes, as predicted by the electric double layer theories. Moreover, we observe a saturation of the potential rise at high charging states, to a value that is nearly independent of the analyzed material. This saturation represents the most relevant element that determines the performances of the CAPMIX cell under study; we attribute it to a kinetic effect. (C) 2014 Elsevier Inc. All rights reserved.

【 授权许可】

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