TY - GEN A1 - Gutic, Sanjin J. A1 - Kozlica, Dzevad K. A1 - Bajuk-Bogdanovic, Danica A1 - Mitric, Miodrag A1 - Mirsky, Vladimir M. A1 - Mentus, Slavko V. A1 - Pasti, Igor A. T1 - Electrochemical tuning of capacitive response of graphene oxide T2 - Physical Chemistry, Chemical Physics N2 - The increasing energy demands of modern society require a deep understanding of the properties of energy storage materials, as well as the tuning of their performance. We show that the capacitance of graphene oxide (GO) can be precisely tuned using a simple electrochemical reduction route. In situ resistance measurements, in combination with cyclic voltammetry measurements and Raman spectroscopy, have shown that upon reduction GO is irreversibly deoxygenated, which is further accompanied by structural ordering and an increase in electrical conductivity. The capacitance is maximized when the concentration of oxygen functional groups is properly balanced with the conductivity. Any further reduction and deoxygenation leads to a gradual loss of capacitance. The observed trend is independent of the preparation route and the exact chemical and structural properties of GO. It is proposed that an improvement in the capacitive properties of any GO can be achieved by optimization of its reduction conditions. Y1 - 2018 U6 - https://doi.org/10.1039/C8CP03631D SN - 1463-9084 SN - 1463-9076 VL - 35 IS - 20 SP - 22698 EP - 22709 ER -