Volfkovich Yury M, Rychagov Alexey Y, Sosenkin Valentin E, Baskakov Sergey A, Kabachkov Eugene N, Shulga Yury M
A.N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninsky pr. 31, 119071 Moscow, Russia.
Federal Research Center of Problem of Chemical Physics and Medicinal Chemistry, Russian Academy of Sciences, 142432 Chernogolovka, Russia.
Materials (Basel). 2022 Nov 7;15(21):7856. doi: 10.3390/ma15217856.
The electrochemical properties of the highly porous reduced graphene oxide/titanium dioxide (rGO/TiO) nanocomposite were studied to estimate the possibility of using it as a supercapacitor electrode. Granular aerogel rGO/TiO was used as an initial material for the first time of manufacturing the electrode. For the aerogel synthesis, industrial TiO Hombikat UV100 with a high specific surface area and anatase structure was used, and the aerogel was carried out with hydrazine vapor. Porous structure and hydrophilic-hydrophobic properties of the nanocomposite were studied with a method of standard contact porosimetry. This is important for a supercapacitor containing an aqueous electrolyte. It was found that the hydrophilic specific surface area of the nanocomposite was approximately half of the total surface area. As a result of electrochemical hydrogenation in the region of zero potential according to the scale of a standard hydrogen electrode, a reversible Faraday reaction with high recharge rate (exchange currents) was observed. The characteristic charging time of the indicated Faraday reaction does not exceed several tens of seconds, which makes it possible to consider the use of this pseudocapacitance in the systems of fast energy storage such as hybrid supercapacitors. Sufficiently high limiting pseudo-capacitance (about 1200 C/g TiO) of the reaction was obtained.
研究了高度多孔的还原氧化石墨烯/二氧化钛（rGO/TiO）纳米复合材料的电化学性质，以评估将其用作超级电容器电极的可能性。颗粒状气凝胶rGO/TiO首次被用作制造电极的初始材料。对于气凝胶合成，使用了具有高比表面积和锐钛矿结构的工业TiO Hombikat UV100，并通过肼蒸气进行气凝胶制备。采用标准接触孔隙率测定法研究了纳米复合材料的多孔结构和亲水-疏水性质。这对于含有水性电解质的超级电容器很重要。发现纳米复合材料的亲水性比表面积约为总表面积的一半。根据标准氢电极的标度，在零电位区域进行电化学氢化时，观察到具有高充电速率（交换电流）的可逆法拉第反应。所示法拉第反应的特征充电时间不超过几十秒，这使得可以考虑在诸如混合超级电容器等快速能量存储系统中使用这种赝电容。该反应获得了足够高的极限赝电容（约1200 C/g TiO）。
