一种高效稳定的珊瑚状 CoFeS2，用于可穿戴柔性全固态非对称超级电容器应用,New Journal of Chemistry

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一种高效稳定的珊瑚状 CoFeS2，用于可穿戴柔性全固态非对称超级电容器应用
New Journal of Chemistry ( IF 2.7 ) Pub Date : 2021-07-31 , DOI: 10.1039/d1nj02561a
Yongxiao Tuo ₁ , Xiaomeng Chen ₂ , Wanli Liu ₁ , Qian Di ₂ , Chen Chen ₂ , Yan Zhou ₁ , Jun Zhang _{1,

2}

Affiliation

探索高效廉价的超级电容器材料已成为研究热点。在这项工作中，珊瑚状CoFeS ₂纳米材料通过有机溶剂热法合成并应用于超级电容器。由于其大的比表面积和独特的珊瑚结构，CoFeS ₂电极材料在2M KOH水性电解质中表现出高比容量（1457.1 F g ^-1在2 A g ^-1）和倍率性能。不对称 CoFeS ₂ ‖AC 超级电容器在 790 W kg ^-1的功率密度下提供 66.4 W h kg ^-1的高能量密度，在10 A g ^-1的电流密度下循环10 000次后比电容保持率为97.6% ，显示出良好的循环稳定性。CoFeS ₂的电极材料组装成纽扣电池，可以点亮LED或打开电机风扇。为了评估可穿戴柔性非对称储能设备的可行性，研究了柔性全固态非对称超级电容器，其在 525 W kg ^-1的功率密度下显示出 47.2 W h kg ^-1的高能量密度，并且在5 A g ^-1的电流密度下，8000次循环后比电容保持率为87.8%. 该研究为它们在未来的实际应用中应用提供了可能性，并且该合成策略可以扩展到合成其他具有优异超级电容器性能的过渡金属硫化物材料。

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An efficient and stable coral-like CoFeS2 for wearable flexible all-solid-state asymmetric supercapacitor applications

Exploring efficient and inexpensive materials for supercapacitors has become a research highlight. In this work, coral-like CoFeS₂ nanomaterials were synthesized by an organic solvothermal method and applied to supercapacitors. Due to their large specific surface area and unique coral structure, the CoFeS₂ electrode materials exhibited high specific capacity (1457.1 F g⁻¹ at 2 A g⁻¹) and rate performance in a 2M KOH aqueous electrolyte. An asymmetric CoFeS₂‖AC supercapacitor delivers a high energy density of 66.4 W h kg⁻¹ at a power density of 790 W kg⁻¹, and the retention rate of specific capacitance is 97.6% after 10 000 cycles at a current density of 10 A g⁻¹, showing good cycling stability. The electrode material of CoFeS₂ was assembled into a button battery that can light up an LED or turn on a motor fan. In order to evaluate the feasibility of wearable flexible asymmetric energy storage devices, flexible all-solid-state asymmetric supercapacitors were investigated, which showed a high energy density of 47.2 W h kg⁻¹ at a power density of 525 W kg⁻¹, and the retention rate of specific capacitance was 87.8% after 8000 cycles at a current density of 5 A g⁻¹. This study provides the possibility of applying them in future practical applications, and the synthesis strategy can be extended to synthesize other transition metal sulfide materials with excellent supercapacitor performance.

更新日期：2021-08-19

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