Facile Preparation of High-Performance Free-Standing Micro-Supercapacitors by Optimizing Oxygen Groups on Graphene,Small

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Facile Preparation of High-Performance Free-Standing Micro-Supercapacitors by Optimizing Oxygen Groups on Graphene
Small ( IF 13.0 ) Pub Date : 2024-09-06 , DOI: 10.1002/smll.202404307
Shiyu Chen _{1,

2} , Hui Sun ₁ , Yuewen Chen ₁ , Qihan Fang ₁ , Ziyuan Huang ₁ , Yuan Liu _{1,

2} , Jie Chen _{1,

3} , Mingming Chen ₁ , Dawei Cao _{1,

2}

Affiliation

Free-standing micro-supercapacitor (MSC) devices without substrate or current collectors are promising for practical applications. However, it is still difficult to prepare high-performance free-standing MSC devices because of the requirement of optimized active sites, conductivity, ion diffusion, controlled patterns, moisture susceptibility, etc. Here, it is proposed that the optimization of oxygen level on graphene is promising to solve these requirements because of the balance of sp² and sp³ hybridization. Using the medium-oxidized graphene, the flexible, conductive, hydro-stable, easy-processing film can be facilely obtained, which facilitates the preparation of free-standing MSC electrodes. After constructing with gel electrolyte, the free-standing MSC device shows a high capacitance of 898.4 mF cm⁻² using aqueous-gel electrolyte and 383.6 mF cm⁻² using ion-gel electrolyte with mass loading of ca. 10 mg cm⁻². Correspondingly, the MSC device can achieve a landmark energy density of 42.6 µWh cm⁻² at 0.85 mW cm⁻² (7.1 mWh cm⁻³ at 141.7 mW cm⁻³). The advantages of high performance, facile preparation, and low inactive components make the free-standing MSC device promising for practical applications.

中文翻译：

通过优化石墨烯上的氧基团轻松制备高性能独立式微型超级电容器

没有衬底或集流体的独立式微型超级电容器（MSC）器件在实际应用中前景广阔。然而，由于需要优化的活性位点、电导率、离子扩散、受控模式、湿气敏感性等，制备高性能的独立式 MSC 装置仍然很困难。在这里，由于 sp² 和 sp³ 杂化的平衡，石墨烯上氧含量的优化有望解决这些要求。使用中等氧化石墨烯，可以很容易地获得柔性、导电、水稳定、易于加工的薄膜，这有助于制备独立的 MSC 电极。使用凝胶电解质构建后，独立式 MSC 器件在使用水性凝胶电解质时显示出 898.4 mF ^cm-2 的高电容，使用离子凝胶电解质时显示出 383.6 mF ^cm-2 的高电容，质量负荷约为 10 mg ^cm-2。相应地，MSC 器件可以在 0.85 mW ^cm-2 时达到 42.6 μWh ^cm-2 的标志性能量密度（在 141.7 mW ^cm-3 时达到 7.1 mWh ^cm-3）。高性能、简单的制备和低非活性成分等优点使独立式 MSC 装置有望用于实际应用。

更新日期：2024-09-06

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