用于超级电容器的分层聚吡咯涂层 VS4 的生物催化合成†...

IF 2.6 3区 化学 Q2 CHEMISTRY, MULTIDISCIPLINARY
CrystEngComm Pub Date : 2024-11-12 DOI:10.1039/D4CE01010H
Yao Ding, Zhong Yi Shi, Kailin Li, Jinsong Rao, Xiaobin Gong, Shupei Liu, Bo Yang and Yu Xin Zhang
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引用次数: 0

摘要

四硫化钒(VS4)由于其独特的一维结构特征和较高的硫含量,越来越被认为是超级电容器的潜在电极材料。然而,其固有的低电导率和钒在电解液中的溶解倾向严重阻碍了其循环性能,导致实际应用条件下比容量有限。先进储能材料的实现主要取决于多种氧化态的开发、合理的纳米结构设计和高导电性的实现。因此,我们报道了利用两步水热和氧化聚合技术在生物模板硅藻土(De@VS4@PPy)表面成功构建了VS4和聚吡咯(PPy)交叉排列的纳米结构,这导致了显著的电化学性能(在电流密度为1 ag−1时的比电容为243.33 F g−1)和出色的储能能力(3000次循环后电容保持率为97.7%)。高导电性和交叉排列的纳米结构有助于有效的电解质离子扩散,同时最小化电荷转移阻力。值得注意的是,De@VS4@PPy纳米结构电极材料具有显著的比电容、宽的电位窗口和出色的循环稳定性。此外,该策略可以很容易地扩展到实际应用中,例如采用De@VS4@PPy纳米电极材料组装的不对称超级电容器,其潜在窗口和最大能量密度分别高达1.8 V和21.75 W h kg - 1 (899.94 W kg - 1)。该工作为今后的研究提供了有价值的参考,重点是筛选和优化优质电极材料。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Bio-templated synthesis of hierarchical polypyrrole-coated VS4 for supercapacitors†

Bio-templated synthesis of hierarchical polypyrrole-coated VS4 for supercapacitors†

Vanadium tetrasulfide (VS4) is increasingly acknowledged as a potential electrode material for supercapacitors, attributed to its unique one-dimensional structural characteristics and elevated sulfur content. However, its intrinsic low conductivity and the tendency of vanadium to dissolve in the electrolyte have severely hindered its cycling performance, resulting in limited specific capacity under practical application conditions. The realization of advanced energy storage materials predominantly hinges on the exploitation of multiple oxidation states, the design of rational nanostructures, and the achievement of high electrical conductivity. Consequently, we report the successful construction of VS4 and polypyrrole (PPy) cross-aligned nanostructures on the surface of bio-templated diatomite (De@VS4@PPy) using a two-step hydrothermal and oxidative polymerization technique, which has led to remarkable electrochemical performance (specific capacitance of 243.33 F g−1 at a current density of 1 A g−1) and outstanding energy storage capabilities (97.7% capacitance retention after 3000 cycles). The highly conductive and cross-aligned nanostructures facilitate efficient electrolyte ion diffusion and concurrently minimize charge transfer resistance. Notably, the De@VS4@PPy nanostructured electrode materials demonstrate significant specific capacitance, a broad potential window, and outstanding cycling stability. Furthermore, this strategy can be readily extended to practical applications, exemplified by the asymmetric supercapacitors assembled employing De@VS4@PPy nano-electrode materials, which can achieve potential windows and maximum energy densities up to 1.8 V and 21.75 W h kg−1 (at 899.94 W kg−1), respectively. This work serves as a valuable reference for future studies focused on the screening and optimization of superior electrode materials.

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来源期刊
CrystEngComm
CrystEngComm 化学-化学综合
CiteScore
5.50
自引率
9.70%
发文量
747
审稿时长
1.7 months
期刊介绍: Design and understanding of solid-state and crystalline materials
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