Gonçalves Roger, Lima Thiago M, Paixão Márcio W, Pereira Ernesto C
Center for the Development of Functional Materials (CDMF), Department of Chemistry, Federal University of São Carlos Mail Box 676, CEP 13565-905 São Carlos SP Brazil
Inorganic Chemistry Department, Federal Fluminense University CEP 24020-150 Niterói RJ Brazil.
RSC Adv. 2018 Oct 15;8(61):35327-35336. doi: 10.1039/c8ra06656f. eCollection 2018 Oct 10.
Understanding the basic properties of pristine carbon nitride electrodes is of great importance for their further applications as supercapacitor materials. To this end, a comparative study of unmodified carbon nitride is crucial to understand the difference between the bare material and its composite counterparts described in the literature. Therefore, the aim of this paper is to explore the electrochemical behaviour of casting-produced CN electrodes using cyclic voltammetry, charge/discharge curves and impedance spectroscopy. The results from this study show a capacitance value of 113.7 F g at 0.2 A g with an impressive retention of 89.2% after 5000 charge and discharge cycles at 3.0 A g. In addition, this material shows a large amount of specific energy (76.5 W h kg) at an operation power of 11.9 W kg, decreasing only 10.7% due to the electrochemical aging process. Hence, CN constitutes a long-life pristine material with a large amount of energy and a moderate operation power with better performance than other CN-based composites found in the literature. These results are important to gain a better understanding of the inherent properties of carbon nitride - to further design composites with higher specific capacitance, longer lifetime, and specific energy.
了解原始氮化碳电极的基本特性对于其作为超级电容器材料的进一步应用至关重要。为此，对未改性氮化碳进行对比研究对于理解裸材料与其文献中所述的复合对应物之间的差异至关重要。因此，本文的目的是使用循环伏安法、充放电曲线和阻抗谱来探索铸造生产的CN电极的电化学行为。该研究结果表明，在0.2 A g下电容值为113.7 F g，在3.0 A g下进行5000次充放电循环后，令人印象深刻地保留了89.2%。此外，这种材料在11.9 W kg的运行功率下显示出大量的比能量（76.5 W h kg），由于电化学老化过程仅降低了10.7%。因此，CN构成了一种长寿命的原始材料，具有大量能量和适度的运行功率，性能优于文献中发现的其他基于CN的复合材料。这些结果对于更好地理解氮化碳的固有特性非常重要，以便进一步设计具有更高比电容、更长寿命和比能量的复合材料。
