Chang Jiuli, Zang Shiqi, Liang Wenfang, Wu Dapeng, Lian Zhaoxun, Xu Fang, Jiang Kai, Gao Zhiyong
School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, Henan Normal University, Xinxiang 453007, Henan, PR China.
Key Laboratory of Yellow River and Huai River Water Environment and Pollution Control, Ministry of Education, Henan Key Laboratory for Environment Pollution Control, International Joint Laboratory on Key Techniques in Water Treatment, Henan Province, School of Environment, Henan Normal University, Xinxiang 453007, Henan, PR China.
J Colloid Interface Sci. 2021 May 15;590:114-124. doi: 10.1016/j.jcis.2021.01.035. Epub 2021 Jan 15.
The intrinsic faradic reactivity is the uppermost factor determining the charge storage capability of battery material, the construction of p-n junction composing of different faradic components is a rational tactics to enhance the faradic activity. Herein, a reduced graphene oxide@cobalt nickle sulfide@nickle cobalt layered double hydroxide composite (rGO@CoNiS@NiCo LDH) with p-n junction structure is designed by deposition of n-type nickle cobalt layered double hydroxide (NiCo LDH) around p-type reduced graphene oxide@cobalt nickle sulfide (rGO@CoNiS), the charge redistribution across the p-n junction enables enhanced faradic activities of both components and further the overall charge storage capacity of the resultant rGO@CoNiS@NiCo LDH battery electrode. As expected, the rGO@CoNiS@NiCo LDH electrode can deliver high specific capacity (C, 1310 ± 26 C g at 1 A g) and good cycleability (77% C maintaining ratio undergoes 5000 charge-discharge cycles). Furthermore, the hybrid supercapacitor (HSC) based on the rGO@CoNiS@NiCo LDH p-n junction battery electrode exports high energy density (E, 57.4 Wh kg at 323 W kg) and good durability, showing the prospect of faradic p-n junction composite in battery typed energy storage.
本征法拉第反应活性是决定电池材料电荷存储能力的最关键因素，构建由不同法拉第组分组成的p-n结是提高法拉第活性的合理策略。在此，通过在p型还原氧化石墨烯@钴镍硫化物（rGO@CoNiS）周围沉积n型镍钴层状双氢氧化物（NiCo LDH），设计了一种具有p-n结结构的还原氧化石墨烯@钴镍硫化物@镍钴层状双氢氧化物复合材料（rGO@CoNiS@NiCo LDH），p-n结处的电荷重新分布使两种组分的法拉第活性增强，进而提高了所得rGO@CoNiS@NiCo LDH电池电极的整体电荷存储容量。正如预期的那样，rGO@CoNiS@NiCo LDH电极能够提供高比容量（在1 A g时为1310±26 C g）和良好的循环稳定性（在5000次充放电循环后保持率为77%）。此外，基于rGO@CoNiS@NiCo LDH p-n结电池电极的混合超级电容器（HSC）具有高能量密度（在323 W kg时为57.4 Wh kg）和良好的耐久性，显示出法拉第p-n结复合材料在电池型储能方面的应用前景。
