Tabti Zakaria, Ruiz-Rosas Ramiro, Quijada César, Cazorla-Amorós Diego, Morallón Emilia
Departamento de Química Física e Instituto Universitario de Materiales, Universidad de Alicante , Apartado 99, E-03080 Alicante, Spain.
ACS Appl Mater Interfaces. 2014 Jul 23;6(14):11682-91. doi: 10.1021/am502475v. Epub 2014 Jul 3.
This paper presents a systematic study of the effect of the electrochemical treatment (galvanostatic electrolysis in a filter-press electrochemical cell) on the surface chemistry and porous texture of commercial activated carbon cloth. The same treatments have been conducted over a granular activated carbon in order to clarify the effect of morphology. The influence of different electrochemical variables, such as the electrode polarity (anodic or cathodic), the applied current (between 0.2 and 1.0 A) and the type of electrolyte (HNO3 and NaCl) have also been analyzed. The anodic treatment of both activated carbons causes an increase in the amount of surface oxygen groups, whereas the cathodic treatment does not produce any relevant modification of the surface chemistry. The HNO3 electrolyte produced a lower generation of oxygen groups than the NaCl one, but differences in the achieved distribution of surface groups can be benefitial to selectively tune the surface chemistry. The porous texture seems to be unaltered after the electro-oxidation treatment. The validity of this method to introduce surface oxygen groups with a pseudocapacitive behavior has been corroborated by cyclic voltammetry. As a conclusion, the electrochemical treatment can be easily implemented to selectively and quantitatively modify the surface chemistry of activated carbons with different shapes and morphologies.
本文对电化学处理（在压滤式电化学池中进行恒电流电解）对商用活性炭布表面化学性质和多孔结构的影响进行了系统研究。为了阐明形态的影响，对粒状活性炭进行了相同的处理。还分析了不同电化学变量的影响，如电极极性（阳极或阴极）、施加电流（0.2至1.0 A之间）和电解质类型（HNO3和NaCl）。两种活性炭的阳极处理都会导致表面含氧基团数量增加，而阴极处理不会对表面化学性质产生任何相关改变。HNO3电解质产生的含氧基团比NaCl电解质少，但表面基团分布的差异可能有利于选择性地调节表面化学性质。电氧化处理后多孔结构似乎未发生变化。循环伏安法证实了该方法引入具有赝电容行为的表面含氧基团的有效性。总之，电化学处理可以很容易地实施，以选择性地和定量地改变不同形状和形态的活性炭的表面化学性质。
