Single-layer MnO2 nanosheets: From controllable synthesis to free-standing film for flexible supercapacitors
Single-layer MnO2 nanosheets: From controllable synthesis to free-standing film for flexible supercapacitors
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DOI：
10.1016/j.matlet.2016.04.060
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发表时间：
2016-08
影响因子：
3
通讯作者：
Ying Yu;Yunyun Zhai;Haiqing Liu;Lei-ming Li
中科院分区：
文献类型：
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作者：
Ying Yu;Yunyun Zhai;Haiqing Liu;Lei-ming Li
超级电容器作为一种重要的电源和储能单元，越来越受到人们的关注。然而，设计良好组织的电极结构以赋予柔性超级电容器优异的性能仍然是一个挑战。在这里，制备了厚度为0.9 nm的MnO2纳米片，并将其用于2D架构的理想构建块。通过真空辅助过滤和随后的温和热处理制备自支撑膜，其直接用作柔性超级电容器的无粘合剂电极。这种独特的层状结构有利于MnO2向rGO的电子转移。因此，在50 A g− 1下实现了98 F g− 1的高比电容。值得注意的是，6000次循环后的电容保持率大于95%。
Supercapacitors, as one type of significant power source and energy storage unit, have attracted more and more attention. However, designing well-organized electrode structures to endow the flexible supercapacitors with excellent performances still remains a challenge. Here, the ultrathin MnO2nanosheets with a thickness of 0.9 nm were produced and used for ideal building blocks of 2D architectures. The free-standing film were prepared by vacuum-assisted filtration and the following mild thermal treatment, which were used directly as a binder-free electrode for flexible supercapacitors. Such unique lamellar structure were favorable for electron transfer from MnO2to rGO. As a consequence, a high specific capacitance of 98 F g−1at 50 A g−1is achieved. Remarkably, the capacitance retention after 6000 cycles is more than 95%.