Porous Fe2O3 Modified by Nitrogen-Doped Carbon Quantum Dots/ Reduced Graphene Oxide Composite Aerogel as a High-Capacity and High-Rate Anode Material for Alkaline Aqueous Batteries
Porous Fe2O3 Modified by Nitrogen-Doped Carbon Quantum Dots/ Reduced Graphene Oxide Composite Aerogel as a High-Capacity and High-Rate Anode Material for Alkaline Aqueous Batteries
复制标题
氮掺杂碳量子点/还原氧化石墨烯复合气凝胶改性多孔Fe2O3作为碱性水系电池高容量高倍率负极材料
DOI：
10.1021/acsami.9b12827
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发表时间：
2019
影响因子：
9.5
通讯作者：
Yirong Zhu
中科院分区：
文献类型：
--
作者：
Xiaoru Yun;Jingying Li;Xianhong Chen;Han Chen;Li Xiao;Kaixiong Xiang;Wenhao Chen;Haiyang Liao;Yirong Zhu
碳量子点作为一种新型的新兴材料，近年来引起了人们的极大关注。在此，我们首次报道了三维CQD基复合气凝胶作为碱性水电池优良电极材料的新应用。以高收率（>40%）制备了可规模化的石墨CQD，并进一步用于制备具有不同Fe 2 O3含量的新型氮掺杂CQD/还原氧化石墨烯/多孔Fe 2 O3（N-CQD/rGO/Fe 2 O3）复合气凝胶。该复合气凝胶具有独特的三维网络结构，具有高比表面积和分级多孔结构，同时具有高容量Fe 2 O3和高导电性和稳定性的N-CQD/rGO的协同效应，具有优异的比容量、倍率性能和上级循环性能。N-CQDs/rGO/Fe_2O_3 -1电极的电化学性能较好，（Fe 2 O3，34.9wt%）表现出最佳倍率性能（在5、50和100 A g-1时，容量保持率分别为72.1、58.9和46.2%）和循环性能（在3A g-1下，5000次循环的容量保持率为80.4%），而N-CQD/rGO/Fe 2 O3 -3电极（Fe 2 O3，62.3wt%）显示出最高的比容量（在1A g-1下，274.1mA h g-1）。本研究为开发高性能三维CQD基复合气凝胶在储能系统中的应用提供了有价值的指导。
Carbon quantum dots (CQDs) as novel types of emerging materials have aroused tremendous attention in recent years. Herein, we report for the first time a new application of 3D CQD-based composite aerogels as excellent electrode materials for alkaline aqueous batteries. The scalable graphitic CQDs are prepared with high yields (>40%) and further utilized to fabricate the novel nitrogen-doped CQDs/reduced graphene oxide/porous Fe2O3(N-CQDs/rGO/Fe2O3) composite aerogels with different contents of Fe2O3. Benefiting from the unique 3D network composite aerogel structure with a high surface area and hierarchical porous structure as well as the synergistic effect of high-capacity Fe2O3and highly conductive and stable N-CQDs/rGO, the composite aerogels achieve enhanced electrochemical properties with ultrahigh specific capacity, admirable rate property, and superior cycling performance. Furthermore, theN-CQDs/rGO/Fe2O3-1 electrode (Fe2O3, 34.9 wt %) exhibits the best rate capability (72.1, 58.9, and 46.2% capacity retention at 5, 50, and 100 A g–1, respectively) and cycle performance (80.4% capacity retention at 3 A g–1over 5000 cycles), while the N-CQDs/rGO/Fe2O3-3 electrode (Fe2O3, 62.3 wt %) displays the highest specific capacity (274.1 mA h g–1at 1 A g–1). The current research provides a valuable guidance for developing high-performance 3D CQD-based composite aerogels for application in energy storage systems.