MOE of the Key Laboratory of Bioinorganic and Synthetic Chemistry, KLGHEI of Environment and Energy Chemistry, School of Chemistry, Sun Yat-Sen University, Guangzhou, 510275, P.R. China.
School of Applied Physics and Materials, Wuyi University, Jiangmen, Guangdong, 529020, P.R. China.
Angew Chem Int Ed Engl. 2017 May 8;56(20):5454-5459. doi: 10.1002/anie.201701737. Epub 2017 Mar 27.
The voltage of carbon-based aqueous supercapacitors is limited by the water splitting reaction occurring in one electrode, generally resulting in the promising but unused potential range of the other electrode. Exploiting this unused potential range provides the possibility for further boosting their energy density. An efficient surface charge control strategy was developed to remarkably enhance the energy density of multiscale porous carbon (MSPC) based aqueous symmetric supercapacitors (SSCs) by controllably tuning the operating potential range of MSPC electrodes. The operating voltage of the SSCs with neutral electrolyte was significantly expanded from 1.4 V to 1.8 V after simple adjustment, enabling the energy density of the optimized SSCs reached twice as much as the original. Such a facile strategy was also demonstrated for the aqueous SSCs with acidic and alkaline electrolytes, and is believed to bring insight in the design of aqueous supercapacitors.
碳基水系超级电容器的电压受到发生在一个电极中的水分解反应的限制，这通常导致另一个电极中具有很大潜力但未被利用的潜在范围。利用这个未被利用的潜在范围为进一步提高它们的能量密度提供了可能性。开发了一种有效的表面电荷控制策略，通过可控地调节多尺度多孔碳（MSPC）电极的工作电位范围，显著提高了基于 MSPC 的水系对称超级电容器（SSC）的能量密度。经过简单调整，中性电解质 SSC 的工作电压从 1.4 V 显著扩展到 1.8 V，使优化后的 SSC 的能量密度达到原来的两倍。这种简单的策略也被证明适用于酸性和碱性电解质的水系 SSC，并且有望为水系超级电容器的设计提供新的思路。
