Ferroelectric benzimidazole additive-induced interfacial water confinement for stable 2.2 V supercapacitor electrolytes exposed to air,Chemical Communications

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Ferroelectric benzimidazole additive-induced interfacial water confinement for stable 2.2 V supercapacitor electrolytes exposed to air
Chemical Communications ( IF 4.3 ) Pub Date : 2022-07-27 , DOI: 10.1039/d2cc03732g
Hongyu Liang ₁ , Renxing Shi ₁ , Yan Zhou ₁ , Wenya Jiang ₂ , Qin Kang ₂ , Hongyu Zhang ₂ , Kuanguan Liu ₃ , Jiabiao Lian ₂ , Yongfeng Bu ₂

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Deep eutectic solvents (DESs) are known as low-cost and environmentally friendly electrolytes for supercapacitors. However, because DESs are particularly vulnerable to moisture adsorption in the air, the voltage window (<1.2 V) is significantly lower than expected. Herein, we report a new ferroelectric benzimidazole (BI) additive that, by restricting water electrochemical activity at the DES/carbon electrode interface, allows air-exposed DESs to reach a high voltage of 2.2 V. The optimized DES with 0.5 wt% BI addition not only increases the voltage but also the capacitance and energy density while maintaining excellent cycling stability. This study addresses the voltage drop of DESs in air, providing insights into the design of additives that inhibit interfacial water splitting.

中文翻译：

铁电苯并咪唑添加剂诱导的界面水限制用于稳定的暴露于空气中的 2.2 V 超级电容器电解质

深共晶溶剂（DESs）被称为超级电容器的低成本和环保电解质。然而，由于 DES 特别容易吸收空气中的水分，因此电压窗口 (<1.2 V) 明显低于预期。在此，我们报告了一种新的铁电苯并咪唑 (BI) 添加剂，它通过限制 DES/碳电极界面处的水电化学活性，使暴露在空气中的 DES 达到 2.2 V 的高电压。添加 0.5 wt% BI 的优化 DES不仅增加了电压，还增加了电容和能量密度，同时保持了出色的循环稳定性。本研究解决了空气中 DES 的电压降，为抑制界面水分解的添加剂设计提供了见解。

更新日期：2022-07-27

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