Abstract
Layered double hydroxide (LDH) has been regarded as one of ideal electrode for supercapacitors due to layered structure, multiple redox active centers, and synergistic effects between metal ions. However, low capacitance and poor cycling stability greatly limit their large-scale application. Herein, nickel-aluminum layered double hydroxide (NiAl-LDH) onto nickel foam has been prepared by a simple one-step hydrothermal method, with the charge storage capability controlled by using different reactant concentration. It is found that the reactant concentration can regulate the morphology, crystallinity and loading density of NiAl-LDH. The optimized NiAl-LDH (Ni1Al1-LDH) shows a porous nanosheet structure with oxygen defects, which tightly covers on the nickel foam to facilitate ion and electron transfers, improving the redox activity of Ni ions and thus energy storage. As a supercapacitor electrode, the Ni1Al1-LDH achieves a specific capacitance of 1958.1 F/g at a current density of 1 A/g. The capacitance retention rate can reach as high as 108.7% up to 1000 cycles of continuous charge and discharge at a scan rate of 100 mV/s.
摘要
层状双金属氢氧化物(LDH)由于具有层状结构、丰富的氧化还原活性中心和金属离子间的协同作用被认为是超级电容器的理想电极之一。然而, 低的比电容和较差的循环稳定性极大地限制了它们的规模化应用。本文采用简单的一步水热法在泡沫镍上制备层状镍铝双金属氢氧化物(NiAl-LDH), 并通过不同的反应物浓度控制其电荷存储能力。研究发现反应物浓度对NiAl-LDH 的形貌、结晶度和负载密度有明显调节作用。优化后的NiAl-LDH(Ni1Al1-LDH)具有丰富氧缺陷的多孔纳米片结构, 该结构紧密包覆在高导电性泡沫镍表面, 促进了离子和电子的转移, 有效提高了Ni 离子的氧化还原活性, 从而提高了能量储存能力。作为超级电容器电极, Ni1Al1-LDH 在电流密度为1 A/g 时的比电容为1958.1 F/g。在100 mV/s 的扫速下, 经过1000 次持续充放电循环, 电容保持率高达108.7%。
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LIU Shao-bo and ZHAO Yong-feng conducted the literature review, provided the concept and edited the draft of manuscript. They contributed this work equally. LI Heng-yue and YANG Jun-liang reviewed, designed the work and guided the writing.
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LIU Shao-bo, ZHAO Yong-feng, LI Heng-yue and YANG Jun-liang declare that they have no conflict of interest.
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Foundation item: Project(2022YFB3803300) supported by the National Key Research and Development Program of China; Project (52173192) supported by the National Natural Science Foundation of China; Project(2023JJ40040) supported by the Natural Science Foundation of Hunan Province, China
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Liu, Sb., Zhao, Yf., Li, Hy. et al. One-step synthesis of porous nickel-aluminum layered double hydroxide with oxygen defects for high-performance supercapacitor electrode. J. Cent. South Univ. 30, 4138–4148 (2023). https://doi.org/10.1007/s11771-023-5501-7
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DOI: https://doi.org/10.1007/s11771-023-5501-7