|
| 高循环稳定性碳化钛/氧化石墨烯复合超级电容 |
| High cycle-stability supercapacitors with Ti3C2Tx MXene/graphene oxide composite electrodes |
| 投稿时间：2023-02-24 |
| DOI：10.3969/j.issn.1005-5630.2023.005.006 |
| 中文关键词: 碳化钛 氧化石墨烯 超级电容器 循环稳定性 |
| 英文关键词:titanium carbide graphene oxide supercapacitors cycle-stability |
| 基金项目:国家自然科学基金面上项目（11974247） |
|
| 摘要点击次数: 1590 |
| 全文下载次数: 1521 |
| 中文摘要: |
| 二维材料碳化钛（Ti3C2Tx）因具有高导电性和大比表面积的特点，在作为超级电容电极材料时，可以实现较高的能量密度。然而，Ti3C2Tx在储能过程中会出现不可逆的氧化失活反应，而且它与基底间的结合力较差，这将导致碳化钛超级电容的循环稳定性欠佳，极大地阻碍了其作为电极材料的广泛应用。将Ti3C2Tx作为活性层与氧化石墨烯（GO）分层复合制作成超级电容电极，覆盖在Ti3C2Tx薄膜之上的GO层可以削弱氧化失活反应。同时，对电极的热处理可提升Ti3C2Tx对基底的附着力。这使得Ti3C2Tx/GO复合电极的充放电循环稳定性明显改善，在5 000次循环之后其容量仍高于初始容量。该设计可为制备高循环稳定性超级电容提供参考。 |
| 英文摘要: |
| Due to high conductivity and large specific surface area, 2D titanium carbide (Ti3C2Tx) can be used as an electrode material for supercapacitors with high energy density. However, the deactivation of Ti3C2Tx through irreversible oxidation in energy storage and the poor surface interaction between Ti3C2Tx and substrates result in poor cycle stabilities of Ti3C2Tx supercapacitors, thereby greatly hindering wide applications of energy storage materials. In this paper, Ti3C2Tx is used as an active layer and covered by a graphene oxide (GO) film. The GO film weakens the oxidation deactivation of Ti3C2Tx. Meanwhile, a heat treatment procedure of the electrode is involved to improve the surface interaction. This makes the cycling stability of the Ti3C2Tx/GO composite electrodes significantly improved, and the capacitance is higher than the initial one after 5000 cycles. The results can provide an innovative pathway for the design and preparation of high cycle-stability supercapacitors. |
| HTML 查看全文 查看/发表评论 下载PDF阅读器 |
| 关闭 |
