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          我所MXene基高比能超級電容器研究取得新進展

            近日,我所二維材料與能源器件研究組(DNL21T3)吳忠帥研究員與中科院金屬所王曉輝研究員團隊合作,采用二維金屬碳化物MXene為負極,碳納米管為正極,具有氧化還原活性的對苯二酚為正極電解液添加劑,構建了氫離子“搖椅”式高比能超級電容器,相關成果發表在《美國化學會·納米》(ACS Nano)上。

            MXene是一類二維金屬碳(氮)化物納米片,具有高體積比容量(1500F/cm3)和高質量比容量(380F/g),是一種非常有前景的超級電容器電極材料。然而,目前報道的大部分是水系對稱型超級電容器,存在工作電壓窗口較窄(一般為0.6 V)的問題,導致獲得的能量密度較低。因此,為充分發揮MXene的高比容量的特點,急需發展高電壓超級電容器,以獲得高的能量密度。

            最近,該研究團隊使用Ti3C2Tx MXene為負極,碳納米管為正極,硫酸溶液和硫酸-對苯二酚混合液分別為負極和正極電解液,質子選擇性透過的Nafion膜為隔膜,構建了氫離子“搖椅”式非對稱超級電容器。在充放電過程中,吸附在碳納米管上的對苯二酚發生可逆的去質子化和質子化過程,為正極提供高贗電容;同時,伴隨著負極氫離子的插入和脫出,Ti3C2Tx中的鈦元素發生可逆的氧化還原反應。獲得的MXene基非對稱超級電容器不僅實現了氫離子在正負極之間可逆快速移動,而且器件具有1.6V的高工作電壓和62Wh/kg的高能量密度,為目前已報道的水系MXene基超級電容器的最高值。該工作為MXene基非對稱、高比能超級電容器的構建提供了新的思路。

            上述工作得到了國家自然科學基金、國家重點研發計劃等項目的資助。(文/圖 師曉宇、侯曉城)

          版權所有 © 中國科學院大連化學物理研究所 本站內容如涉及知識產權問題請聯系我們 備案號:遼ICP備05000861號 遼公網安備21020402000367號
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