Ultrahigh rate capability supercapacitors based on tremella-like nitrogen and phosphorus co-doped graphene,Materials Chemistry Frontiers

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Ultrahigh rate capability supercapacitors based on tremella-like nitrogen and phosphorus co-doped graphene
Materials Chemistry Frontiers ( IF 6.0 ) Pub Date : 2020-07-10 , DOI: 10.1039/d0qm00392a
Guifang Li _{1,

2,

3} , Yawen Li _{1,

2,

3} , Jingxia Deng _{1,

2,

3} , Huiting Lin _{1,

2,

3} , Xinyi Hou _{1,

2,

3} , Lishan Jia _{1,

2,

3}

Affiliation

The incorporation of heteroatomic atoms into the graphene crystal lattice not only effectively introduces the bandgap but also increases the defects and the localized reactivity of the graphene, and thereby the remarkable electrochemical properties of graphene are imparted. The phosphorus (P) and nitrogen (N) co-doped graphene (PNG) electrode materials are prepared by a one-step hydrothermal method and look like tremella with bent and wrinkled structures, which facilitates the construction of a multiple thin-wall electrolytic cell. The amount of ammonium dihydrogen phosphate is controlled to adjust the PNG morphology. The 20PNG electrode material exhibits a high specific capacitance of 348 F g⁻¹ at a current density of 1 A g⁻¹. When the current density is increased to 50 times, the specific capacitance value is still 83% of the initial value, which indicates that 20PNG has an extremely high rate performance. Additionally, the symmetric supercapacitor 20PNG//20PNG shows a high energy density of 34.7 W h kg⁻¹ at a power density of 500 W kg⁻¹ in a 2 M Li₂SO₄ aqueous electrolyte and maintains an initial specific capacitance of 91.4% after 20 000 cycles. Therefore, this simple strategy for synthesizing carbon-based materials will provide a broad opportunity for supercapacitor energy storage applications.

中文翻译：

基于银耳状氮磷共掺杂石墨烯的超高倍率超级电容器

将杂原子引入石墨烯晶格中不仅有效地引入了带隙，而且增加了石墨烯的缺陷和局部反应性，从而赋予了石墨烯显着的电化学性能。磷（P）和氮（N）共掺杂石墨烯（PNG）电极材料是通过一步水热法制备的，看起来像银耳，具有弯曲和起皱的结构，这有利于构造多个薄壁电解槽。控制磷酸二氢铵的量以调节PNG形态。20PNG电极材料在1 A g ^-1的电流密度下表现出348 F g ^-1的高比电容。当电流密度增加到50倍时，比电容值仍为初始值的83％，这表明20PNG具有极高的倍率性能。此外，对称超级电容器20PNG // 20PNG在2 M Li ₂ SO ₄水溶液中的功率密度为500 W kg ^-1时显示34.7 W h kg ^-1的高能量密度，并保持91.4％的初始比电容在2万次循环之后。因此，这种简单的合成碳基材料的策略将为超级电容器储能应用提供广阔的机会。

更新日期：2020-08-27

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