Synthesis of C/Co3O4 composite mesoporous hollow sphere sandwich graphene films for high-performance supercapacitors†,Inorganic Chemistry Frontiers

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Synthesis of C/Co3O4 composite mesoporous hollow sphere sandwich graphene films for high-performance supercapacitors†
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2018-08-28 00:00:00 , DOI: 10.1039/c8qi00559a
Lin Sun _{1,

2,

3,

4} , Ming Yan _{1,

2,

3,

5,

6} , Lisong Xiao _{1,

2,

3,

4} , Yu Liu _{1,

2,

3,

4} , Hongye Bai _{1,

2,

3,

4} , Li Xie _{1,

2,

3,

4} , Weidong Shi _{1,

2,

3,

4}

Affiliation

Carbon/Co₃O₄ composite mesoporous hollow spheres (C/Co₃O₄ MHSs) and graphene oxide were successfully synthesized to fabricate hybrid films. Unique sandwich and mesoporous structures can provide more pathways for electrolyte transmission and achieve excellent electrochemical performance. After combining with C/Co₃O₄ MHSs, the hybrid films can achieve a specific capacity of 1266.0 F g⁻¹ at a current density of 1 A g⁻¹, which is much higher than that of the C/Co₃O₄ MHSs (153.9 F g⁻¹) and reduced graphene oxide (rGO) films (213.5 F g⁻¹). Moreover, a rGO/C/Co₃O₄//rGO asymmetric supercapacitor (ASC) device was fabricated. The ASC exhibits a high energy density of 32.7 Wh kg⁻¹ (power density of 800 W kg⁻¹) and an excellent cycling stability with 85.9% capacitance retention after 5000 cycles. Besides, white LED bulbs (3.2 V) can be lit by two ASCs in series.

中文翻译：

高性能超级电容器用C / Co ₃ O ₄复合中孔空心球夹心石墨烯薄膜的合成†

成功地合成了碳/ Co ₃ O ₄复合介孔空心球（C / Co ₃ O ₄ MHSs）和氧化石墨烯，以制备杂化膜。独特的夹层结构和中孔结构可以提供更多的电解质传输途径，并实现出色的电化学性能。与C / Co ₃ O ₄ MHS结合后，杂化膜在1 A g ^-1的电流密度下可以达到1266.0 F g ^-1的比电容，这比C / Co ₃ O _4的比密度高得多。MHS（153.9 F g ^-1）和还原氧化石墨烯（rGO）膜（213.5 F g ^-1）。此外，制造了rGO / C / Co ₃ O ₄ // rGO不对称超级电容器（ASC）器件。ASC表现出32.7 Wh kg ^-1的高能量密度（800 W kg ^-1的功率密度）和出色的循环稳定性，在5000次循环后电容保持率为85.9％。此外，白色LED灯泡（3.2 V）可以由两个串联的ASC点亮。

更新日期：2018-08-28

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