Plasma-Engineered N-CoO<em><sub>x</sub></em> Nanowire Array as a Bifunctional Electrode for Supercapacitor and Electrocatalysis
Surface engineering has achieved great success in enhancing the electrochemical activity of Co<sub>3</sub>O<sub>4</sub>. However, the previously reported methods always involve high-temperature calcination processes which are prone to induce agglomeration of the nanostructure...
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MDPI AG
2022-08-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/12/17/2984 |
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| author | Qi Wang Tongtong Zhong Zhou Wang |
| author_facet | Qi Wang Tongtong Zhong Zhou Wang |
| author_sort | Qi Wang |
| collection | DOAJ |
| description | Surface engineering has achieved great success in enhancing the electrochemical activity of Co<sub>3</sub>O<sub>4</sub>. However, the previously reported methods always involve high-temperature calcination processes which are prone to induce agglomeration of the nanostructure, leading to the attenuation of performance. In this work, Co<sub>3</sub>O<sub>4</sub> nanowires were successfully modified by a low-temperature NH<sub>3</sub>/Ar plasma treatment, which simultaneously generated a porous structure and efficient nitrogen doping with no agglomeration. The modified N-CoO<i><sub>x</sub></i> electrode exhibited remarkable performance due to the synergistic effect of the porous structure and nitrogen doping, which provided additional active sites for faradic transitions and improved charge transfer characteristics. The electrode achieved excellent supercapacitive performance with a maximum specific capacitance of 2862 mF/cm<sup>2</sup> and superior cycling retention. Furthermore, the assembled asymmetric supercapacitor (N-CoO<i><sub>x</sub></i>//AC) device exhibited an extended potential window of 1.5 V, a maximum specific energy of 80.5 Wh/kg, and a maximum specific power of 25.4 kW/kg with 91% capacity retention after 5000 charge–discharge cycles. Moreover, boosted hydrogen evolution reaction performance was also confirmed by the low overpotential (126 mV) and long-term stability. This work enlightens prospective research on the plasma-enhanced surface engineering strategies. |
| first_indexed | 2024-03-10T01:26:36Z |
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| id | doaj.art-3804c6d7086745e2abe8daac89ce3784 |
| institution | Directory Open Access Journal |
| issn | 2079-4991 |
| language | English |
| last_indexed | 2024-03-10T01:26:36Z |
| publishDate | 2022-08-01 |
| publisher | MDPI AG |
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| series | Nanomaterials |
| spelling | doaj.art-3804c6d7086745e2abe8daac89ce37842023-11-23T13:48:55ZengMDPI AGNanomaterials2079-49912022-08-011217298410.3390/nano12172984Plasma-Engineered N-CoO<em><sub>x</sub></em> Nanowire Array as a Bifunctional Electrode for Supercapacitor and ElectrocatalysisQi Wang0Tongtong Zhong1Zhou Wang2Key Laboratory of Liquid-Solid Structural Evolution and Processing of Materials of Ministry of Education, School of Materials Science and Engineering, Shandong University, Jinan 250061, ChinaKey Laboratory of Liquid-Solid Structural Evolution and Processing of Materials of Ministry of Education, School of Materials Science and Engineering, Shandong University, Jinan 250061, ChinaKey Laboratory of Liquid-Solid Structural Evolution and Processing of Materials of Ministry of Education, School of Materials Science and Engineering, Shandong University, Jinan 250061, ChinaSurface engineering has achieved great success in enhancing the electrochemical activity of Co<sub>3</sub>O<sub>4</sub>. However, the previously reported methods always involve high-temperature calcination processes which are prone to induce agglomeration of the nanostructure, leading to the attenuation of performance. In this work, Co<sub>3</sub>O<sub>4</sub> nanowires were successfully modified by a low-temperature NH<sub>3</sub>/Ar plasma treatment, which simultaneously generated a porous structure and efficient nitrogen doping with no agglomeration. The modified N-CoO<i><sub>x</sub></i> electrode exhibited remarkable performance due to the synergistic effect of the porous structure and nitrogen doping, which provided additional active sites for faradic transitions and improved charge transfer characteristics. The electrode achieved excellent supercapacitive performance with a maximum specific capacitance of 2862 mF/cm<sup>2</sup> and superior cycling retention. Furthermore, the assembled asymmetric supercapacitor (N-CoO<i><sub>x</sub></i>//AC) device exhibited an extended potential window of 1.5 V, a maximum specific energy of 80.5 Wh/kg, and a maximum specific power of 25.4 kW/kg with 91% capacity retention after 5000 charge–discharge cycles. Moreover, boosted hydrogen evolution reaction performance was also confirmed by the low overpotential (126 mV) and long-term stability. This work enlightens prospective research on the plasma-enhanced surface engineering strategies.https://www.mdpi.com/2079-4991/12/17/2984plasmanitrogen dopingCo<sub>3</sub>O<sub>4</sub>supercapacitorelectrocatalysis |
| spellingShingle | Qi Wang Tongtong Zhong Zhou Wang Plasma-Engineered N-CoO<em><sub>x</sub></em> Nanowire Array as a Bifunctional Electrode for Supercapacitor and Electrocatalysis Nanomaterials plasma nitrogen doping Co<sub>3</sub>O<sub>4</sub> supercapacitor electrocatalysis |
| title | Plasma-Engineered N-CoO<em><sub>x</sub></em> Nanowire Array as a Bifunctional Electrode for Supercapacitor and Electrocatalysis |
| title_full | Plasma-Engineered N-CoO<em><sub>x</sub></em> Nanowire Array as a Bifunctional Electrode for Supercapacitor and Electrocatalysis |
| title_fullStr | Plasma-Engineered N-CoO<em><sub>x</sub></em> Nanowire Array as a Bifunctional Electrode for Supercapacitor and Electrocatalysis |
| title_full_unstemmed | Plasma-Engineered N-CoO<em><sub>x</sub></em> Nanowire Array as a Bifunctional Electrode for Supercapacitor and Electrocatalysis |
| title_short | Plasma-Engineered N-CoO<em><sub>x</sub></em> Nanowire Array as a Bifunctional Electrode for Supercapacitor and Electrocatalysis |
| title_sort | plasma engineered n coo em sub x sub em nanowire array as a bifunctional electrode for supercapacitor and electrocatalysis |
| topic | plasma nitrogen doping Co<sub>3</sub>O<sub>4</sub> supercapacitor electrocatalysis |
| url | https://www.mdpi.com/2079-4991/12/17/2984 |
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