Aqueous microsupercapacitors (AMSCs) with safe and low-cost are anticipated as a leading choice for micro energy storage devices. Nevertheless, the current issue with AMSCs is their extremely low area energy density and power density, which is caused by a strong interaction between metal ions as well as the stacking properties of thick electrodes. Herein, we develop AMSCs based on the tailoring mechanism of NH₄⁺/H⁺ co-adsorption into hydroxylated Ti₃C₂ MXene (h-Ti₃C₂ MXene). This co-adsorption mechanism enhances the adsorption kinetics of electrode materials. The ultra-high-load h-Ti₃C₂ MXene with a carpet shape and more oxygen-containing functional groups further improves the low performance of the thick electrode. As a result, the reported AMSCs exhibit impressive power density (16.50 mW cm^–2 at 110.91 μWh cm^–2), energy density (394.59 μWh cm^–2 at 0.825 mW cm^–2), and cycle life (20 000 GCD cycles retain 92.45%). This work provides an entirely new tailoring NH₄⁺/H⁺ co-adsorption mechanism for building advanced AMSCs.

中文翻译：

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将 NH4+/H+ 共吸附化学调整到 h-Ti3C2 MXene 中，用于高负载水系微型超级电容器

安全且低成本的水性微型超级电容器（AMSC）有望成为微型储能设备的首选。然而，AMSC目前的问题是其极低的面积能量密度和功率密度，这是由金属离子之间的强烈相互作用以及厚电极的堆叠特性引起的。在此，我们基于NH ₄ ⁺ /H ⁺共吸附羟基化Ti ₃ C ₂ MXene（h-Ti ₃ C ₂ MXene）的定制机制开发了AMSC。这种共吸附机制增强了电极材料的吸附动力学。地毯状和更多含氧官能团的超高负载h-Ti ₃ C ₂ MXene进一步改善了厚电极的低性能。因此，所报道的 AMSC 表现出令人印象深刻的功率密度（110.91 μWh cm ^–2时为 16.50 mW cm ^–2）、能量密度（0.825 mW cm ^–2时为 394.59 μWh cm ^–2）和循环寿命（20 000 个 GCD 循环保留92.45%）。这项工作为构建先进的AMSCs提供了一种全新的定制NH ₄ ⁺ /H ⁺共吸附机制。