In situ formation of a renewable cellulose hydrogel electrolyte for high-performance flexible all-solid-state asymmetric supercapacitors†,Sustainable Energy & Fuels

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In situ formation of a renewable cellulose hydrogel electrolyte for high-performance flexible all-solid-state asymmetric supercapacitors†
Sustainable Energy & Fuels ( IF 5.0 ) Pub Date : 2019-08-28 , DOI: 10.1039/c9se00339h
Hongfei Wang _{1,

2,

3,

4,

5} , Juan Wu _{1,

2,

3,

4,

5} , Jun Qiu _{1,

2,

3,

4,

5} , Kefu Zhang _{1,

2,

3,

4,

5} , Jingwen Shao _{1,

2,

3,

4,

5} , Lifeng Yan _{1,

2,

3,

4,

5}

Affiliation

All-solid-state supercapacitors using renewable and biodegradable hydrogel-based electrolytes are attractive where the close contact of the electrode and electrolyte will promote electron transfer. Here, we report an in situ low temperature cross-linking approach to prepare a new type of cellulose-based hydrogel electrolyte for application in flexible all-solid-state hydrogel supercapacitors where the as-prepared N-doped graphene (NG) hydrogel works as the electrode. When crosslinked using 3 mL epichlorohydrin, the optimized symmetric supercapacitor exhibited a high specific capacitance of 98.8 F g⁻¹ at 1 A g⁻¹, good rate capability of 89.5% at 16 A g⁻¹ and excellent capacitance retention of 93.9% after 5000 charges/discharge cycles. The interconnected cellulose chains acted as a framework that provided mechanical stability for supercapacitors to work normally in the bending state without electrochemical performance reduction. Then an asymmetric supercapacitor was fabricated using the cellulose hydrogel as the electrolyte, NG and cobalt carbonate hydroxide (CCH)/NG hydrogels as electrodes, and achieved a maximum energy density of 45.3 W h kg⁻¹ at a power density of 742.0 W kg⁻¹. These results confirm that the newly developed cellulose hydrogel electrolyte has great potential for use in various energy storage devices.

中文翻译：

用于高性能柔性全固态不对称超级电容器的可再生纤维素水凝胶电解质的原位形成†

使用可再生和可生物降解的基于水凝胶的电解质的全固态超级电容器具有吸引力，因为电极和电解质的紧密接触将促进电子转移。在这里，我们报告了一种原位低温交联方法，以制备一种新型的基于纤维素的水凝胶电解质，该电解质可用于柔性全固态水凝胶超级电容器，其中制备的N掺杂石墨烯（NG）水凝胶的工作原理如下：电极。当使用3 mL表氯醇交联时，优化的对称超级电容器在1 A g ^-1时显示98.8 F g ^-1的高比电容，在16 A g ^-1时显示89.5％的良好倍率能力在5000次充电/放电循环后，出色的电容保持率为93.9％。互连的纤维素链充当框架，为超级电容器提供机械稳定性，使其在弯曲状态下正常工作，而不会降低电化学性能。然后不对称超级电容器是使用纤维素的水凝胶作为电解质制成，NG和氢氧化碳酸钴（CCH）/ NG水凝胶作为电极，并取得了45.3 W时公斤的最大能量密度^-1在742.0千克w ^的功率密度^{- 1}。这些结果证实了新开发的纤维素水凝胶电解质具有用于各种能量存储装置中的巨大潜力。

更新日期：2019-10-24

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