煤焦油沥青层状硬模板结合预碳化活化法制备层状多级多孔碳用于超级电容器,ACS Applied Energy Materials

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煤焦油沥青层状硬模板结合预碳化活化法制备层状多级多孔碳用于超级电容器
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2022-12-03 , DOI: 10.1021/acsaem.2c02866
Yuchen Jiang ₁ , Zhifeng He ₁ , Xin Cui ₁ , Zeyi Liu ₁ , Jiafeng Wan ₁ , Yifu Liu ₁ , Fangwei Ma ₁

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层状多孔碳有利于电解质离子的扩散和渗透，作为储能电极材料具有极大的优势。在这项工作中，层状Mg ₅ (OH) ₄ (CO ₃ ) ₂ ·4H ₂ O模板是在低温水热条件下通过简单的沉淀法合成的。_{通过Mg 5} (OH) ₄ (CO ₃ ) ₂ ·4H ₂成功合成层状多级多孔碳(LHPC)O硬模板和以煤焦油沥青（CTP）为碳源的KOH活化法。详细研究了活化温度和活化剂用量对形貌、微观结构和超级电容器性能的影响。LHPCs-1–700 具有良好的层状结构和丰富的介孔结构，从而表现出优于其他碳电极的电容性能。LHPCs-1–700 的比电容在 1 A g –1 时达到 298 F g –1，^在⁵⁰ A g ^–1时仍保持 234 F g ^–1在三电极系统中具有 78.5% 的高电容保持率。^{还根据在不同扫描速率下获得的 CV 数据分析了 LHPCs-1–700 电极的动力学行为，发现在 200 mV s –1}时，快速动力学电容贡献高达 87% 。组装好的 LHPCs-1–700 对称超级电容器在 1 M Na ₂ SO ₄溶液中提供 16.73 W h kg ^–1的能量密度和 859.4 W kg ^{–1的功率密度。}此外，8000次循环后比电容保持率仍可达到95.8%。

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Lamellar Hierarchical Porous Carbon Prepared from Coal Tar Pitch through a Lamellar Hard Template Combined with the Precarbonization and Activation Method for Supercapacitors

The lamellar porous carbon favors the diffusion and penetration of electrolyte ions and presents a fantastic advantage as an energy storage electrode material. In this work, the lamellar Mg₅(OH)₄(CO₃)₂·4H₂O template is synthesized via a simple precipitation method in the low-temperature hydrothermal condition. Lamellar hierarchical porous carbon (LHPC) is successfully synthesized through the Mg₅(OH)₄(CO₃)₂·4H₂O hard template and the KOH activation method using coal tar pitch (CTP) as the carbon source. The effects of activation temperature and activator dosage on the morphology, microstructure, and supercapacitor performance are researched at length. LHPCs-1–700 displays a good lamellar structure and an abundant mesoporous structure, so as to exhibit superior capacitive performance compared with other carbon electrodes. The specific capacitance for LHPCs-1–700 reaches 298 F g^–1 at 1 A g^–1 and still maintains 234 F g^–1 at 50 A g^–1 with a high capacitance retention of 78.5% in the three-electrode system. The kinetic behavior of the LHPCs-1–700 electrode was also analyzed according to the CV data obtained at different scan rates, and it was found that the fast kinetic capacitance contribution was up to 87% at 200 mV s^–1. The assembled LHPCs-1–700 symmetric supercapacitor delivered an energy density of 16.73 W h kg^–1 with a power density of 859.4 W kg^–1 in 1 M Na₂SO₄ solution. Besides, the specific capacitance retention rate could still reach 95.8% after 8000 cycles.

更新日期：2022-12-03

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