2024-03-29T12:34:18Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/1116052021-06-14T10:00:58Zcom_10261_84com_10261_5col_10261_337
Lobato Ortega, Belén
Wendelbo, Rune
Barranco, Violeta
Álvarez Centeno, Teresa
2015-03-02T12:01:14Z
2015-03-02T12:01:14Z
2014-10
Electrochimica Acta 149: 245-251 (2014)
0013-4686
http://hdl.handle.net/10261/111605
10.1016/j.electacta.2014.10.095
A graphite oxide, obtained on a large scale at low cost as an intermediate in the graphene production, achieves specific capacitances (159 Fg−1 in H2SO4 and 82 Fg−1 in (C2H5)4NBF4 in acetonitrile) that compete with those of activated carbons and largely surpass the values obtained with graphene nanoplatelets. More promising, the high electrode density leads to volumetric capacitances of 177 and 59 F cm−3 in the aqueous and the organic electrolytes, respectively, which are above most data reported for carbons. In the aqueous electrolyte, the graphite oxide stands out on energy density when compared to graphene nanoplatelets and on power capability if compared to an activated carbon commercialized for supercapacitors, whereas in the organic electrolyte, the limited interlayer spacing restricts the mobility of the larger ions into the expanded graphitic structure. This study also illustrates that the specific surface of carbons measured by standard gas adsorption may not be a relevant parameter as it does not always match the electrochemically active area involved in the energy storage.
eng
openAccess
Graphite oxide
Surface area
Electrochemical double-layer
Supercapacitor
Graphite Oxide: An Interesting Candidate for Aqueous Supercapacitors
artículo