Chemical Engineering Journal ( IF 13.3 ) Pub Date : 2019-11-11 00:00:00 , DOI: 10.1016/j.cej.2019.123454
Jialin Gu , Li Sun , Yuanxing Zhang , Qiuyu Zhang , Xiaowei Li , Haochen Si , Yan Shi , Chao Sun , Yi Gong , Yihe Zhang
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A Ni-CoP@C@CNT nanocomposite was synthesized, in which Ni-doped CoP (Ni-CoP) were embedded in amorphous carbon matrix and then anchored on the surface of CNTs. The ZIF-67 derived Ni-CoP@C combined with the CNT skeleton, which rendered the composite with high specific surface area, rich interior porosity and continuous conductive network. This allows effective charge transfer, efficient buffering of interior stress, and therefore full exertion of the phosphide’s pseudocapacitive performance. The Ni-doping was achieved by a facile solution-based ion exchange process of ZIF-67 at room temperature, which, according to the first principle calculations, was helpful to increase the ratio of free electrons in Ni-CoP to contribute to higher charge transmission behavior in electrochemical reactions. Due to the above characteristics, the Ni-CoP@C@CNT electrode exhibited a high specific capacitance of 708.1 F g−1 at 1 A g−1, which is almost fourfold compare to CoP@C (349.2 F g−1 at 1 A g−1). The ASC advice based on Ni-CoP@C@CNT can achieve a high energy density of 17.4 Wh kg−1 at the power density of 699.1 W kg−1 and excellent electrochemical cycling stability with a high capacitance retention of 117%. The Ni-CoP@C@CNT have great potential for the advanced energy storage devices.
中文翻译:
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MOF衍生的Ni掺杂的CoP @ C在CNT上生长,用于高性能超级电容器
合成了一种Ni-CoP @ C @ CNT纳米复合材料,其中将Ni掺杂的CoP(Ni-CoP)嵌入无定形碳基质中,然后锚固在CNT的表面上。ZIF-67衍生的Ni-CoP @ C与CNT骨架相结合,使复合材料具有较高的比表面积,丰富的内部孔隙率和连续的导电网络。这样可以进行有效的电荷转移,有效地缓冲内部应力,从而充分发挥磷化物的假电容性能。通过室温下基于溶液的ZIF-67离子交换过程实现Ni掺杂,根据第一原理计算,这有助于增加Ni-CoP中自由电子的比例,从而有助于更高的电荷电化学反应中的传输行为。由于上述特征,-1 1 A G -1,这几乎是四倍比较扶贫@ C(349.2 F G -1 1 A G -1)。基于Ni-CoP @ C @ CNT的ASC建议可在699.1 W kg -1的功率密度下实现17.4 Wh kg -1的高能量密度,并具有出色的电化学循环稳定性和117%的高电容量保持率。Ni-CoP @ C @ CNT对于先进的储能设备具有巨大的潜力。