Abstract In this work, effect of processing temperature in electrochemical capacitors was investigated for g-C3N4. The g-C3N4 materials (CN) were synthesized by thermal condensation of melamine precursor at different temperature (450, 550 and 650 °C). Then, the g-C3N4 materials were deposited on electrochemically reduced TiO2 nanowires/nanotubes arrays (rTWTA)/Ti substrate. The g-C3N4/rTWTA/Ti electrodes were used as supercapacitor electrodes. Morphology, crystal structure and chemical composition of the g-C3N4/rTWTA/Ti electrodes were studied by FESEM, XRD, FTIR and elemental analysis. Based on galvanostatic charge/discharge measurements, the CN(450)/rTWTA/Ti electrode exhibited the highest specific capacitance up to 22 mF/cm2 at 0.3 mA/cm2 with long cyclic durability at 96.8% capacitance retention after 500 cycle. This effect was attributed to the existence of higher nitrogen content, more active sites, the improved hydrophilicity and three-dimensional morphology of the CN(450)/rTWTA/Ti electrode as compared to the other electrodes. This research introduces the optimum thermal condensation temperature of the melamine for synthesis of the g-C3N4 with great potentials in supercapacitors.

中文翻译：

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冷凝温度对还原 TiO2 纳米线/纳米管阵列负载 g-C3N4 电化学电容性能的影响

摘要 在这项工作中，研究了电化学电容器中加工温度对 g-C3N4 的影响。g-C3N4 材料 (CN) 是通过三聚氰胺前体在不同温度 (450、550 和 650 °C) 下热缩合合成的。然后，将 g-C3N4 材料沉积在电化学还原的 TiO2 纳米线/纳米管阵列 (rTWTA)/Ti 基板上。g-C3N4/rTWTA/Ti 电极用作超级电容器电极。通过FESEM、XRD、FTIR和元素分析研究了g-C3N4/rTWTA/Ti电极的形貌、晶体结构和化学成分。基于恒电流充电/放电测量，CN(450)/rTWTA/Ti 电极在 0.3 mA/cm2 下表现出高达 22 mF/cm2 的最高比电容，并且在 500 次循环后具有 96.8% 的电容保持率的长循环耐久性。这种效应归因于与其他电极相比，CN(450)/rTWTA/Ti 电极具有更高的氮含量、更多的活性位点、改进的亲水性和三维形貌。本研究介绍了三聚氰胺的最佳热缩合温度，用于合成在超级电容器中具有巨大潜力的 g-C3N4。