Most recently, graphene-related composite-modified electrode surfaces are been widely employed to improve surface interactions and electron transfer kinetics. Hydrothermally prepared strontium pyro niobate (SPN) and reduced graphene oxide/strontium pyro niobate (RGOSPN) nanostructures reveal excellent morphology. X-ray diffraction analysis of SPN and RGOSPN agree with standard data. Thermogravimetry–differential scanning calorimetry analyses show that RGOSPN has higher thermal stability than SPN. In addition, from the polarization–electric field (P–E) loop measurements, the estimated value of remnant polarization (P_r) and coercive electric field (E_c) of SPN are 0.039 µC cm⁻² and − 2.90 kV cm⁻¹ and that of RGOSPN nanocomposite are 0.0139 µC cm⁻² and − 2.04 kV cm⁻¹. Cyclic voltammetry measurements show that RGOSPN nanocomposite manifests the possibility of electrochemical reversibility beyond long cycles without change in performance. The redox cycle reveal that RGOSPN can be used as part of a composite electrode for hybrid capacitors dynamic conditions. Moreover, the specific capacitance of SPN and RGOSPN was calculated using galvanostatic charge–discharge (GCD) technique. The observed energy density of 9.1 W h kg⁻¹ in RGOSPN is higher when compared with previous reported values.

最近，石墨烯相关的复合改性电极表面被广泛采用以改善表面相互作用和电子转移动力学。水热制备的焦铌酸锶（SPN）和还原的氧化石墨烯/焦铌酸锶（RGOSPN）纳米结构显示出优异的形态。SPN和RGOSPN的X射线衍射分析与标准数据一致。热重分析-差示扫描量热法分析表明，RGOSPN比SPN具有更高的热稳定性。另外，根据极化-电场（P - E）环路测量，SPN的剩余极化（P _r）和矫顽电场（E _c）的估计值为0.039 µC cm ^-2-2.90 kV cm ^-1和-2.90 kV cm ^-1和RGOSPN纳米复合材料的为0.0139 µC cm ^-2和-2.04 kV cm ^-1。循环伏安法测量表明，RGOSPN纳米复合材料显示出在长时间循环后电化学可逆性没有性能变化的可能性。氧化还原循环表明，RGOSPN可用作混合电容器动态条件下复合电极的一部分。此外，SPN和RGOSPN的比电容是使用恒电流充放电（GCD）技术计算的。与先前报道的值相比，在RGOSPN中观察到的9.1 W h kg ^-1的能量密度更高。