原位生长（NH 4）2 V 10 O 25 ·8H 2 O像海胆一样的分层阵列，作为全固态超级电容器的优越电极<a href="#fn1" title="提供电子补充信息（ESI）。参见DOI：10.1039 / c8ta05706k">†</a>,Journal of Materials Chemistry A

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原位生长（NH ₄）₂ V ₁₀ O ₂₅ ·8H ₂ O像海胆一样的分层阵列，作为全固态超级电容器的优越电极 †
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2018-07-27 00:00:00 , DOI: 10.1039/c8ta05706k
Yingchang Jiang _{1,

2,

3,

4} , Le Jiang _{1,

2,

3,

4} , Zeyi Wu _{1,

2,

3,

4} , Peiyu Yang _{1,

2,

3,

4} , Haitao Zhang _{4,

5,

6,

7,

8} , Zhichang Pan _{1,

2,

3,

4} , Linfeng Hu _{1,

2,

3,

4}

Affiliation

用于高性能伪电容器的具有高度暴露的有源表面的分层纳米结构引起了人们的极大关注。本文中，我们开发了一种用于在高导电性镍泡沫基材上原位生长（NH ₄）₂ V ₁₀ O ₂₅ ·8H ₂ O urchin状分层结构的一步法，该方法可用作全固态先进电极不对称超级电容器。在原位生长的（NH ₄）₂ V ₁₀ ø ₂₅ ·8H ₂ ö海胆状层次结构提供了一个特定的1530 F G电容^-1电流密度为1.5 A g ^-1时，并且由于urchin式分层结构的优点（例如，电化学反应的活性位点更多，扩散时间更短），因此在10 000次循环后仍保留了95.1％的初始电容。由于无粘结剂作用，电荷载流子的长度超过了最近报道的钒酸盐和聚钒酸盐的长度。组装后的全固态（NH ₄）₂ V ₁₀ O ₂₅ ·8H ₂ O @ Ni // PVA / KOH // RGO @ Ni器件在电流密度为92.2 F g ^-1时具有可比的容量。 0.4 A g ^-1在5000次循环后仍具有出色的循环性能。我们的研究为固态超级电容器的新型钒钒多层纳米结构的设计提供了合理的指导，该固态超级电容器在长期循环稳定性和高能量密度方面具有优异的电化学性能。

"点击查看英文标题和摘要"

In situ growth of (NH4)2V10O25·8H2O urchin-like hierarchical arrays as superior electrodes for all-solid-state supercapacitors†

Hierarchical nanostructures with highly exposed active surfaces for use in high-performance pseudocapacitors have attracted considerable attention. Herein, we developed a one-step method for the in situ growth of (NH₄)₂V₁₀O₂₅·8H₂O urchin-like hierarchical structures on highly conductive nickel foam substrates for use as advanced electrodes for all-solid-state asymmetric supercapacitors. The in situ growth of (NH₄)₂V₁₀O₂₅·8H₂O urchin-like hierarchical structures delivers a specific capacitance of 1530 F g⁻¹ at a current density of 1.5 A g⁻¹, and retains 95.1% of the initial capacitance after 10 000 cycles, owing to the advantages of the urchin-like hierarchical structure such as more active sites for electrochemical reactions, as well as a shortened diffusion length for the charge carriers due to a binder-free effect, which exceeds that of most recently reported vanadates and polyvanadates. The as-assembled all-solid-state (NH₄)₂V₁₀O₂₅·8H₂O@Ni//PVA/KOH//RGO@Ni device exhibits a comparable capacity of 92.2 F g⁻¹ at a current density of 0.4 A g⁻¹ and excellent cycling performance through 5000 cycles. Our study provides rational guidance toward the design of novel hierarchical nanostructures of polyvanadate for solid-state supercapacitors with superior electrochemical performances in long-term cycling stability and high energy density.

更新日期：2018-07-27

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