Hierarchical porous NiCo2O4/CeO2 hybrid materials for high performance supercapacitors†,Inorganic Chemistry Frontiers

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Hierarchical porous NiCo2O4/CeO2 hybrid materials for high performance supercapacitors†
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2018-10-22 00:00:00 , DOI: 10.1039/c8qi01010b
Chengzhen Wei _{1,

2,

3,

4,

5} , Rui Zhang _{1,

2,

3,

4,

5} , Xuan Zheng _{1,

2,

3,

4,

5} , Qinglong Ru _{1,

2,

3,

4,

5} , Qingyun Chen _{1,

2,

3,

4,

5} , Can Cui _{1,

2,

3,

4,

5} , Gang Li _{1,

2,

3,

4,

5} , Daojun Zhang _{1,

2,

3,

4,

5}

Affiliation

In this work, hierarchical porous NiCo₂O₄/CeO₂ hybrid materials are successfully designed via a facile solvothermal method and subsequent heat treatment, and possess a large specific surface area (113.02 m² g⁻¹). The hierarchical porous structure and large specific surface area can effectively increase the contact area between the electrode and electrolyte, and also provide rich channels for ion and electron transport. Therefore, when explored as an electrode material in a supercapacitor with KOH and K₄[Fe(CN)₆] electrolytes, the NiCo₂O₄/CeO₂ hybrid materials show a high specific capacitance of 2659.1 F g⁻¹ at 5.0 A g⁻¹ and excellent cycling performances with 99.6% initial capacity retention after 5000 continuous charge–discharge cycles. Moreover, an asymmetric supercapacitor device was assembled by employing NiCo₂O₄/CeO₂ and activated carbon as a positive and negative electrode, respectively. The device delivers a high energy density of 43.3 W h kg⁻¹ at a power density of 1550 W kg⁻¹. Impressively, the energy density can still reach up to 36.9 W h kg⁻¹ at 4650 W kg⁻¹. These remarkable electrochemical performances demonstrate that the hierarchical porous NiCo₂O₄/CeO₂ hybrid materials are a promising candidate for supercapacitors.

中文翻译：

用于高性能超级电容器的多层多孔NiCo ₂ O ₄ / CeO ₂杂化材料†

在这项工作中，通过简便的溶剂热法和随后的热处理成功地设计了分层多孔NiCo ₂ O ₄ / CeO ₂杂化材料，并且具有大的比表面积（113.02 m ² g ^-1）。分层的多孔结构和大的比表面积可以有效地增加电极与电解质之间的接触面积，并提供丰富的离子和电子传输通道。因此，当在具有KOH和K ₄ [Fe（CN）₆ ]电解质的超级电容器中作为电极材料探索时，NiCo ₂ O ₄ / CeO ₂混合材料在5.0 A g ^-1时显示出2659.1 F g ^-1的高比电容，并具有出色的循环性能，经过5000次连续充放电循环后，初始容量保留率为99.6％。此外，通过分别使用NiCo ₂ O ₄ / CeO ₂和活性炭作为正极和负极来组装非对称超级电容器装置。该设备以1550 W kg ^-1的功率密度提供43.3 W h kg ^-1的高能量密度。令人印象深刻的，能量密度仍然可以达到36.9 W时千克^-1在4650公斤w ^ ^-1。这些出色的电化学性能表明，分层多孔NiCo ₂ O ₄ / CeO ₂杂化材料是超级电容器的有希望的候选者。

更新日期：2018-10-22

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