用作超高能量密度和实用质量负载超级电容器电极的生物质衍生碳的界面工程,Advanced Functional Materials

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用作超高能量密度和实用质量负载超级电容器电极的生物质衍生碳的界面工程
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2022-12-16 , DOI: 10.1002/adfm.202212078
Ruwei Chen _{1,

2} , Hao Tang ₁ , Peng He ₁ , Wei Zhang ₂ , Yuhang Dai ₂ , Wei Zong ₂ , Fei Guo ₂ , Guanjie He ₂ , Xiaohui Wang ₁

Affiliation

开发具有高质量负载和高效电子/离子传输的柔性电极具有重要意义，但创新合适的电极结构以实现高能量密度应用仍然是一个挑战。在此，首次通过牺牲模板法在界面工程化的纤维素纺织品中原位形成木质素磺酸盐衍生的 N/S 共掺杂类石墨烯碳。实验和理论计算均表明，形成的具有连续导电通路和多孔特性的石榴状结构允许在整个结构中进行足够的离子/电子传输。结果，获得的柔性电极具有 6534 mF cm ^-2 (335.1 F g ^-1^{) 和在 19.5 mg cm -2}的工业适用质量负载下的优异稳定性。基于相同的电极结构工程，还可以获得具有7000 mF cm ^-2超高电容的赝电容性阴极。^{组装后的非对称超级电容器实现了 3625 mF cm -2}的高面电容和 1.06 mWh cm ^-2的最大能量密度，优于大多数其他报道的高负载超级电容器。这种合成方法和结构工程策略可以提供材料设计概念和在超级电容器以外的储能领域的广泛应用。

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Interface Engineering of Biomass-Derived Carbon used as Ultrahigh-Energy-Density and Practical Mass-Loading Supercapacitor Electrodes

The development of flexible electrodes with high mass loading and efficient electron/ion transport is of great significance but still remains the challenge of innovating suitable electrode structures for high energy density application. Herein, for the first time, lignosulfonate-derived N/S-co-doped graphene-like carbon is in situ formed within an interface engineered cellulose textile through a sacrificial template method. Both experimental and theoretical calculations disclose that the formed pomegranate-like structure with continuous conductive pathways and porous characteristics allows sufficient ion/electron transport throughout the entire structures. As a result, the obtained flexible electrode delivers a remarkable integrated capacitance of 6534 mF cm⁻² (335.1 F g⁻¹) and a superior stability at an industrially applicable mass loading of 19.5 mg cm⁻². A pseudocapacitive cathode with ultrahigh capacitance of 7000 mF cm⁻² can also be obtained based on the same electrode structure engineering. The as-assembled asymmetric supercapacitor achieves a high areal capacitance of 3625 mF cm⁻², and a maximum energy density of 1.06 mWh cm⁻², outperforms most of other reported high-loading supercapacitors. This synthesis method and structural engineering strategy can provide materials design concepts and a wide range of applications in the fields of energy storage beyond supercapacitors.

更新日期：2022-12-16

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