From understanding the formation mechanism to enhanced supercapacitor performance of VSB-5 with a hierarchical structure

Yue Zhang; Rudan Hu; Feng Wen; Jianli Zhang; Yining Wang; Richao Niu; Xin Wang; Junwu Zhu

doi:10.1039/c7ta04857b

From understanding the formation mechanism to enhanced supercapacitor performance of VSB-5 with a hierarchical structure

Yue Zhang
, Rudan Hu
, Feng Wen
, Jianli Zhang
, Yining Wang
, Richao Niu
, Xin Wang
, Junwu Zhu

Nanjing University of Science and Technology

Research output: Contribution to journal › Article › peer-review

14 Scopus citations

Abstract

Understanding the formation mechanism of electrode materials is critical to control their structure and optimize the electrochemical performance for supercapacitors. However, few reports have focused on the formation mechanism of nickel phosphate VSB-5 (Ni₂₀[(OH)₁₂(H₂O)₆][(HPO₄)₈(PO₄)₄]·12H₂O) and its application in the electrochemical field. Here, by controlling the addition amount of aqueous ammonia, rod-like VSB-5 with a hierarchical structure was obtained via a simple hydrothermal method without any structure-directing agents. Importantly, we propose that VSB-5 can be obtained by the transformation of Ni₃(PO₄)₂·8H₂O, and well confirm this by re-adding NH₄H₂PO₄ to a mixture containing rod-like VSB-5 and Ni₃(PO₄)₂·8H₂O with different structures. Benefitting from the understanding of the formation mechanism, hierarchical rod-like VSB-5 with small particle sizes can be obtained which delivers a high capacitance of 1542.0 F g^-1 at a current density of 0.5 A g^-1. To further verify its practical application, a hybrid supercapacitor device with a wide potential window of 1.6 V by using VSB-5 as the positive electrode and the 3D reduced graphene oxide hydrogel as the negative electrode was assembled, which exhibits a remarkable energy density of 42.4 W h kg^-1 with excellent cycling stability (98.3%, 10 000 cycles).

Original language	English
Pages (from-to)	16898-16906
Number of pages	9
Journal	Journal of Materials Chemistry A
Volume	5
Issue number	32
DOIs	https://doi.org/10.1039/c7ta04857b
State	Published - 2017
Externally published	Yes

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SDG 7 Affordable and Clean Energy

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10.1039/c7ta04857b

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@article{5c4bc22d4b5d4b23ae1e4a9de6ad5ed1,

title = "From understanding the formation mechanism to enhanced supercapacitor performance of VSB-5 with a hierarchical structure",

abstract = "Understanding the formation mechanism of electrode materials is critical to control their structure and optimize the electrochemical performance for supercapacitors. However, few reports have focused on the formation mechanism of nickel phosphate VSB-5 (Ni20[(OH)12(H2O)6][(HPO4)8(PO4)4]·12H2O) and its application in the electrochemical field. Here, by controlling the addition amount of aqueous ammonia, rod-like VSB-5 with a hierarchical structure was obtained via a simple hydrothermal method without any structure-directing agents. Importantly, we propose that VSB-5 can be obtained by the transformation of Ni3(PO4)2·8H2O, and well confirm this by re-adding NH4H2PO4 to a mixture containing rod-like VSB-5 and Ni3(PO4)2·8H2O with different structures. Benefitting from the understanding of the formation mechanism, hierarchical rod-like VSB-5 with small particle sizes can be obtained which delivers a high capacitance of 1542.0 F g-1 at a current density of 0.5 A g-1. To further verify its practical application, a hybrid supercapacitor device with a wide potential window of 1.6 V by using VSB-5 as the positive electrode and the 3D reduced graphene oxide hydrogel as the negative electrode was assembled, which exhibits a remarkable energy density of 42.4 W h kg-1 with excellent cycling stability (98.3\%, 10 000 cycles).",

author = "Yue Zhang and Rudan Hu and Feng Wen and Jianli Zhang and Yining Wang and Richao Niu and Xin Wang and Junwu Zhu",

note = "Publisher Copyright: {\textcopyright} 2017 The Royal Society of Chemistry.",

year = "2017",

doi = "10.1039/c7ta04857b",

language = "英语",

volume = "5",

pages = "16898--16906",

journal = "Journal of Materials Chemistry A",

issn = "2050-7488",

publisher = "Royal Society of Chemistry",

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}

TY - JOUR

T1 - From understanding the formation mechanism to enhanced supercapacitor performance of VSB-5 with a hierarchical structure

AU - Zhang, Yue

AU - Hu, Rudan

AU - Wen, Feng

AU - Zhang, Jianli

AU - Wang, Yining

AU - Niu, Richao

AU - Wang, Xin

AU - Zhu, Junwu

PY - 2017

Y1 - 2017

N2 - Understanding the formation mechanism of electrode materials is critical to control their structure and optimize the electrochemical performance for supercapacitors. However, few reports have focused on the formation mechanism of nickel phosphate VSB-5 (Ni20[(OH)12(H2O)6][(HPO4)8(PO4)4]·12H2O) and its application in the electrochemical field. Here, by controlling the addition amount of aqueous ammonia, rod-like VSB-5 with a hierarchical structure was obtained via a simple hydrothermal method without any structure-directing agents. Importantly, we propose that VSB-5 can be obtained by the transformation of Ni3(PO4)2·8H2O, and well confirm this by re-adding NH4H2PO4 to a mixture containing rod-like VSB-5 and Ni3(PO4)2·8H2O with different structures. Benefitting from the understanding of the formation mechanism, hierarchical rod-like VSB-5 with small particle sizes can be obtained which delivers a high capacitance of 1542.0 F g-1 at a current density of 0.5 A g-1. To further verify its practical application, a hybrid supercapacitor device with a wide potential window of 1.6 V by using VSB-5 as the positive electrode and the 3D reduced graphene oxide hydrogel as the negative electrode was assembled, which exhibits a remarkable energy density of 42.4 W h kg-1 with excellent cycling stability (98.3%, 10 000 cycles).

AB - Understanding the formation mechanism of electrode materials is critical to control their structure and optimize the electrochemical performance for supercapacitors. However, few reports have focused on the formation mechanism of nickel phosphate VSB-5 (Ni20[(OH)12(H2O)6][(HPO4)8(PO4)4]·12H2O) and its application in the electrochemical field. Here, by controlling the addition amount of aqueous ammonia, rod-like VSB-5 with a hierarchical structure was obtained via a simple hydrothermal method without any structure-directing agents. Importantly, we propose that VSB-5 can be obtained by the transformation of Ni3(PO4)2·8H2O, and well confirm this by re-adding NH4H2PO4 to a mixture containing rod-like VSB-5 and Ni3(PO4)2·8H2O with different structures. Benefitting from the understanding of the formation mechanism, hierarchical rod-like VSB-5 with small particle sizes can be obtained which delivers a high capacitance of 1542.0 F g-1 at a current density of 0.5 A g-1. To further verify its practical application, a hybrid supercapacitor device with a wide potential window of 1.6 V by using VSB-5 as the positive electrode and the 3D reduced graphene oxide hydrogel as the negative electrode was assembled, which exhibits a remarkable energy density of 42.4 W h kg-1 with excellent cycling stability (98.3%, 10 000 cycles).

UR - https://www.scopus.com/pages/publications/85027509055

U2 - 10.1039/c7ta04857b

DO - 10.1039/c7ta04857b

M3 - 文章

AN - SCOPUS:85027509055

SN - 2050-7488

VL - 5

SP - 16898

EP - 16906

JO - Journal of Materials Chemistry A

JF - Journal of Materials Chemistry A

IS - 32

ER -

From understanding the formation mechanism to enhanced supercapacitor performance of VSB-5 with a hierarchical structure

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