Trace phosphorus−doping significantly improving S-content of binary−doped mesoporous carbon network with enhancing electrochemical performance
Trace phosphorus−doping significantly improving S-content of binary−doped mesoporous carbon network with enhancing electrochemical performance
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DOI：
10.1016/j.micromeso.2017.07.054
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发表时间：
2018-01
影响因子：
5.2
通讯作者：
G. Zhuang;Jiaqi Bai;X. Tao;Jianmin Luo;Xiang Zhou;Wen-xian Chen;Xing Zhong;Xiaonian Li;Jianguo Wang
中科院分区：
文献类型：
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作者：
G. Zhuang;Jiaqi Bai;X. Tao;Jianmin Luo;Xiang Zhou;Wen-xian Chen;Xing Zhong;Xiaonian Li;Jianguo Wang
硫氮共掺杂多孔碳由于硫氮原子的协同作用，在燃料电池、超级电容器和锂离子电池等方面具有潜在的应用前景。然而，一锅法制备的SNPC通常具有硫含量低的缺点，从而削弱了几何和电子上的协同效应。本文报道了一种制备高硫含量SNPC的简便方法。在含硫、氮前驱体的热解过程中引入NaH 2 PO 4有利于将硫原子限制在碳骨架中。结果表明，SNPPC-700和SNPPC-800的硫含量分别为25.05%和12.58%，高于文献报道的硫含量。结构表征表明NaH 2 PO 4盐起着重要作用。此外，LIB测试显示，高硫含量SNPPC-800在100 mA g−1下50次循环后的容量为977.68 mAh g− 1，高于低硫含量SNPC-800。此外，ORR活性测量显示出比低S含量SNPC稍好的性能和循环耐久性。此外，SNPPC-800还显示出出色的超级电容器性能，在0.5 A g−1下的比电容为227.5 F g−1，并在10 A g−1下测量6000次循环后保持160.29 F g− 1。
S, N-co-doped porous carbon (SNPC) exhibit potential application in fuel cell, supercapacitors and lithium-ion batteries (LIBs) because of synergistic effect of S and N atom. However, SNPC prepared by one-pot method usually features the drawback of low S-content and thereby weakens the synergistic effect both geometrically and electronically. Herein, we reported one facile synthetic approach to prepare high S-content SNPC. In this regard, the introduction of NaH2PO4into the pyrolysis of S, N-containing precursor is beneficial to confine S atoms in carbon framework. It is found that S-content is 25.05% for SNPPC-700, 12.58% for SNPPC-800, higher than previously reported results. Structural characterizations indicate that NaH2PO4salt plays an important role. Furthermore, LIBs test shows high S-content SNPPC-800 features the higher capacities of 977.68 mAh g−1after 50 cycles than those of low S-content SNPC-800 at 100 mA g−1. Moreover, ORR activity measurements show a slight better performance and cycling durability than low S-content SNPC. In addition, the SNPPC-800 also reveals excellent supercapacitor performance with an specific capacitance of 227.5 F g−1at 0.5 A g−1, and kept 160.29 F g−1via the measurement of 6000 cycles at 10 A g−1.