Facile Synthesis of Sandwich-Type Porous Structured Ni(OH)<sub>2</sub>/NCNWs/rGO Composite for High Performance Supercapacitor
Nickel hydroxide has ultra-high energy storage capacity in supercapacitors, but poor electrical conductivity limits their further application. The use of graphene to improve its conductivity is an effective measure, but how to suppress the stacking of graphene and improve the overall performance of...
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MDPI AG
2025-02-01
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| Series: | Molecules |
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| Online Access: | https://www.mdpi.com/1420-3049/30/5/1119 |
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| author | Xiaosen Duan Mingyu Dou Lingyang Liu Long Zhang Xianrui Bai Ruixin Yang Hengyi Wang Jianmin Dou |
| author_facet | Xiaosen Duan Mingyu Dou Lingyang Liu Long Zhang Xianrui Bai Ruixin Yang Hengyi Wang Jianmin Dou |
| author_sort | Xiaosen Duan |
| collection | DOAJ |
| description | Nickel hydroxide has ultra-high energy storage capacity in supercapacitors, but poor electrical conductivity limits their further application. The use of graphene to improve its conductivity is an effective measure, but how to suppress the stacking of graphene and improve the overall performance of composite materials has become a new challenge. In this work, a well-designed substrate of N-doped carbon nanowires with reduced graphene oxide (NCNWs/rGO) was fabricated by growing polypyrrole (PPy) nanowires between GO nanosheets layers and then calcining them at high temperatures. This NCNWs/rGO substrate can effectively avoid the stacking of rGO nanosheets, and provides sufficient sites for the subsequent in situ growth of Ni(OH)<sub>2</sub>, forming a uniform and stable Ni(OH)<sub>2</sub>/NCNWs/rGO composite material. Benefiting from the abundant pores, high specific surface area (107.2 m<sup>2</sup> g<sup>−1</sup>), and conductive network throughout the NCNWs/rGO substrate, the deposited Ni(OH)<sub>2</sub> can not only realize an ultra-high loading ratio, but also exposes more active surfaces (221.3 m<sup>2</sup> g<sup>−1</sup>). After a comprehensive electrochemical test, it was found that the Ni(OH)<sub>2</sub>/NCNWs/rGO positive materials have a high specific capacitance of 2016.6 F g<sup>−1</sup> at a scan rate of 1 mV s<sup>−1</sup>, and exhibit significantly better stability. The assembled Ni(OH)<sub>2</sub>/NCNWs/rGO//AC asymmetric supercapacitor could achieve a high energy density of 85.2 Wh kg<sup>−1</sup> at power densities of 381 W kg<sup>−1</sup>. In addition, the asymmetric supercapacitor has excellent stability and could retain 70.1% of initial capacitance after 10,000 cycles. These results demonstrate the feasibility of using NCNWs/rGO substrate to construct high-performance supercapacitor electrode materials, and it is also expected to be promoted in other active composite materials. |
| format | Article |
| id | doaj-art-f5cb047a8d644b1a902f45d17c68ef19 |
| institution | OA Journals |
| issn | 1420-3049 |
| language | English |
| publishDate | 2025-02-01 |
| publisher | MDPI AG |
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| series | Molecules |
| spelling | doaj-art-f5cb047a8d644b1a902f45d17c68ef192025-08-20T02:06:12ZengMDPI AGMolecules1420-30492025-02-01305111910.3390/molecules30051119Facile Synthesis of Sandwich-Type Porous Structured Ni(OH)<sub>2</sub>/NCNWs/rGO Composite for High Performance SupercapacitorXiaosen Duan0Mingyu Dou1Lingyang Liu2Long Zhang3Xianrui Bai4Ruixin Yang5Hengyi Wang6Jianmin Dou7Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology, School of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng 252059, ChinaShandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology, School of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng 252059, ChinaShandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology, School of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng 252059, ChinaShandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology, School of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng 252059, ChinaShandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology, School of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng 252059, ChinaShandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology, School of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng 252059, ChinaShandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology, School of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng 252059, ChinaShandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology, School of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng 252059, ChinaNickel hydroxide has ultra-high energy storage capacity in supercapacitors, but poor electrical conductivity limits their further application. The use of graphene to improve its conductivity is an effective measure, but how to suppress the stacking of graphene and improve the overall performance of composite materials has become a new challenge. In this work, a well-designed substrate of N-doped carbon nanowires with reduced graphene oxide (NCNWs/rGO) was fabricated by growing polypyrrole (PPy) nanowires between GO nanosheets layers and then calcining them at high temperatures. This NCNWs/rGO substrate can effectively avoid the stacking of rGO nanosheets, and provides sufficient sites for the subsequent in situ growth of Ni(OH)<sub>2</sub>, forming a uniform and stable Ni(OH)<sub>2</sub>/NCNWs/rGO composite material. Benefiting from the abundant pores, high specific surface area (107.2 m<sup>2</sup> g<sup>−1</sup>), and conductive network throughout the NCNWs/rGO substrate, the deposited Ni(OH)<sub>2</sub> can not only realize an ultra-high loading ratio, but also exposes more active surfaces (221.3 m<sup>2</sup> g<sup>−1</sup>). After a comprehensive electrochemical test, it was found that the Ni(OH)<sub>2</sub>/NCNWs/rGO positive materials have a high specific capacitance of 2016.6 F g<sup>−1</sup> at a scan rate of 1 mV s<sup>−1</sup>, and exhibit significantly better stability. The assembled Ni(OH)<sub>2</sub>/NCNWs/rGO//AC asymmetric supercapacitor could achieve a high energy density of 85.2 Wh kg<sup>−1</sup> at power densities of 381 W kg<sup>−1</sup>. In addition, the asymmetric supercapacitor has excellent stability and could retain 70.1% of initial capacitance after 10,000 cycles. These results demonstrate the feasibility of using NCNWs/rGO substrate to construct high-performance supercapacitor electrode materials, and it is also expected to be promoted in other active composite materials.https://www.mdpi.com/1420-3049/30/5/1119supercapacitorNi(OH)<sub>2</sub>reduced graphene oxidepositive electrodeN-doped porous carbon |
| spellingShingle | Xiaosen Duan Mingyu Dou Lingyang Liu Long Zhang Xianrui Bai Ruixin Yang Hengyi Wang Jianmin Dou Facile Synthesis of Sandwich-Type Porous Structured Ni(OH)<sub>2</sub>/NCNWs/rGO Composite for High Performance Supercapacitor Molecules supercapacitor Ni(OH)<sub>2</sub> reduced graphene oxide positive electrode N-doped porous carbon |
| title | Facile Synthesis of Sandwich-Type Porous Structured Ni(OH)<sub>2</sub>/NCNWs/rGO Composite for High Performance Supercapacitor |
| title_full | Facile Synthesis of Sandwich-Type Porous Structured Ni(OH)<sub>2</sub>/NCNWs/rGO Composite for High Performance Supercapacitor |
| title_fullStr | Facile Synthesis of Sandwich-Type Porous Structured Ni(OH)<sub>2</sub>/NCNWs/rGO Composite for High Performance Supercapacitor |
| title_full_unstemmed | Facile Synthesis of Sandwich-Type Porous Structured Ni(OH)<sub>2</sub>/NCNWs/rGO Composite for High Performance Supercapacitor |
| title_short | Facile Synthesis of Sandwich-Type Porous Structured Ni(OH)<sub>2</sub>/NCNWs/rGO Composite for High Performance Supercapacitor |
| title_sort | facile synthesis of sandwich type porous structured ni oh sub 2 sub ncnws rgo composite for high performance supercapacitor |
| topic | supercapacitor Ni(OH)<sub>2</sub> reduced graphene oxide positive electrode N-doped porous carbon |
| url | https://www.mdpi.com/1420-3049/30/5/1119 |
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