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Dual-defect site regulation on MOF-derived P-Co3O4@NC@Ov-NiMnLDH carbon arrays for high-performance supercapacitors
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2022-09-13 , DOI: 10.1039/d2ta05146j
Fangfang Zhu 1 , Lin Sun 1 , Yu Liu 1 , Weidong Shi 1
Affiliation  

Introducing oxygen vacancies into hydrotalcite-like materials is considered to have positive effects on improving their electrochemical properties. However, there are still huge challenges to fully utilize the effect of exposed surface defects due to the instability in the electron transfer process. Herein, a dual-defect modulated MOF-derived P-Co3O4@NC@Ov-NiMnLDH heterostructure synthesized via the strategy of P doping and vacancy engineering is proposed in this paper, which can take advantage of synergistic defects to realize high-performance features of supercapacitors and avoid the possible deficiencies caused by single defects. A remarkable specific capacity of the optimized electrode at 1 A g−1 is 285.56 mA h g−1. Moreover, the assembled ASC MOF-derived P-Co3O4@NC@Ov-NiMnLDH//CNT@ZIF-8 derived C delivers an excellent specific capacitance of 61.33 mA h g−1 (1 A g−1), a superior capacity retention rate of 91.92% after 12 000 cycles and additionally, an energy density of up to 49.06 W h kg−1 at a power density of 800 W kg−1. The dual-defect modulated electrode can provide new design ideas for superior-performance energy storage materials.

中文翻译:

MOF衍生的P-Co3O4@NC@Ov-NiMnLDH碳阵列的双缺陷位点调控用于高性能超级电容器

将氧空位引入类水滑石材料被认为对改善其电化学性能具有积极作用。然而,由于电子转移过程的不稳定性,充分利用暴露表面缺陷的影响仍然存在巨大挑战。在此,本文提出了一种通过P掺杂和空位工程合成的双缺陷调制MOF衍生的P-Co 3 O 4 @NC@O v -NiMnLDH异质结构,可以利用协同缺陷实现高- 超级电容器的性能特点,避免了单个缺陷可能导致的缺陷。优化电极在 1 A g -1时具有显着的比容量为 285.56 mA hg -1。此外,组装的 ASC MOF 衍生 P-Co 3 O 4 @NC@O v -NiMnLDH//CNT@ZIF-8 衍生 C 提供了 61.33 mA hg -1 (1 A g -1 ) 的优异比电容,在 12000 次循环后,容量保持率高达 91.92%,此外,在 800 W kg -1 的功率密度下,能量密度高达 49.06 Wh kg -1。双缺陷调制电极可为高性能储能材料提供新的设计思路。
更新日期:2022-09-16
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