With the ever-increasing use of supercapcitors, there is a need for exploring more environment friendly active material-electrolyte combinations. Herein, we report an environmentally benign supercapacitor employing reduced graphite oxide obtained by hydrazine reduction of graphite oxide as active material and pure water (HPLC grade) as ‘electrolyte’. We could achieve a specific capacitance of 333 Fg^-1 at a galvanostatic charge-discharge current of 0.3 Ag^-1. Maximum energy and power density values are 29.6 Whrkg⁻¹ and 266.2 Wkg^-1 respectively. Energy storage mechanism is the diffusion of hydronium ions within the interlayer region of the active material. Hydronium ions are produced by the hydrolysis of hydroxyl groups at the active material - water interface. This supercapacitor exhibits good cycle stability. Concentration of hydroxyl groups is found to be crucial in determining the electrochemical performance. This supercapacitor is thermally self-chargeable with a thermoelectric coefficient of 4.07 mV°C⁻¹ which makes it even more futuristic and environment friendly.

随着超级电容器的不断增加，需要探索更环境友好的活性材料-电解质组合。在此，我们报道了一种环境友好的超级电容器，该超级电容器采用的是通过肼还原氧化石墨作为活性材料，并通过纯水（HPLC级）作为“电解质”而获得的还原氧化石墨。在恒电流为0.3 Ag ^-1的恒流充放电电流下，我们可以实现333 Fg ^-1的比电容。最大能量和功率密度值为29.6 Whrkg ^-1和266.2 Wkg ^-1分别。能量存储机制是水合氢离子在活性材料夹层区域内的扩散。氢氧根离子是由活性物质-水界面处的羟基水解产生的。该超级电容器表现出良好的循环稳定性。发现羟基的浓度对于确定电化学性能至关重要。该超级电容器可热自充电，具有4.07 mV°C ^-1的热电系数，这使其具有更高的未来性和环境友好性。