Co-doped Ni3S2@CNT arrays anchored on graphite foam with a hierarchical conductive network for high-performance supercapacitors and hydrogen evolution electrodes†,Journal of Materials Chemistry A

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Co-doped Ni3S2@CNT arrays anchored on graphite foam with a hierarchical conductive network for high-performance supercapacitors and hydrogen evolution electrodes†
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2018-05-03 00:00:00 , DOI: 10.1039/c8ta03131b
Feifei Wang _{1,

2,

3,

4} , Yanfang Zhu _{1,

2,

3,

4} , Wen Tian _{1,

2,

3,

4} , Xingbin Lv _{1,

2,

3,

4} , Hualian Zhang _{1,

2,

3,

4} , Zhufeng Hu _{1,

2,

3,

4} , Yuxin Zhang _{4,

5,

6,

7} , Junyi Ji _{1,

2,

3,

4,

8} , Wei Jiang _{1,

2,

3,

4}

Affiliation

Engineering the surface structure and constructing a suitable internal conductive network is essential for the electron transfer rate and the active material utilization efficiency of an electrode. Here, high-porosity carbon nanotube (CNT) arrays grown on graphite foam (GNF) are synthesized via the self-sacrificial ZnO nanorod template. Then three-dimensional Co-doped Ni₃S₂ nanostructures (Co–Ni₃S₂) are coated on the CNT surface via a simple hydrothermal process. The CNTs/GNF hybrid with a hierarchical conductive network exhibits good electrical conductivity, while the tectorum-like Co–Ni₃S₂ nanosheet structure may facilitate both the ion and electron transfer in the redox process. Therefore, the Co–Ni₃S₂@CNTs/GNF composite shows a highest specific capacitance of 4.1 F cm⁻², good rate performance (57.8% capacitance retention from 1 to 40 mA cm⁻²) and cycling stability (89.8% capacitance retention after 1000 cycles). Moreover, the Co–Ni₃S₂@CNT/GNF electrode also reveals good hydrogen evolution reaction activity in alkaline solution (an overpotential of 155 mV at 10 mA cm⁻²).

中文翻译：

用于高性能超级电容器和析氢电极的共掺杂Ni ₃ S ₂ @CNT阵列锚固在石墨泡沫上，具有分层的导电网络†

设计表面结构并构建合适的内部导电网络对于电子传输速率和电极活性材料利用效率至关重要。在这里，通过自牺牲ZnO纳米棒模板合成了在石墨泡沫（GNF）上生长的高孔隙率碳纳米管（CNT）阵列。然后，通过简单的水热工艺将三维共掺杂的Ni ₃ S ₂纳米结构（Co–Ni ₃ S ₂）涂覆在CNT表面。具有分层导电网络的CNT / GNF杂化物表现出良好的导电性，而类似于胸膜的Co–Ni ₃ S ₂纳米片结构可以促进氧化还原过程中的离子和电子转移。因此，Co-Ni ₃ S ₂ @ CNTs / GNF复合材料显示出最高的比电容为4.1 F cm ^-2，良好的倍率性能（从1到40 mA cm ^-2的电容保持率为57.8％）和循环稳定性（电容为89.8％） 1000次循环后的保留时间）。此外，Co-Ni ₃ S ₂ @ CNT / GNF电极在碱性溶液中也显示出良好的氢释放反应活性（在10 mA cm ^-2时超电势为155 mV ）。

更新日期：2018-05-03

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