Facile Synthesis of Microsphere-like Co<sub>0.85</sub>Se Structures on Nickel Foam for a Highly Efficient Hydrogen Evolution Reaction
Microsphere-shaped cobalt selenide (Co<sub>0.85</sub>Se) structures were efficiently synthesized via a two-step hydrothermal process. Initially, cobalt hydroxide fluoride (Co(OH)F) microcrystals were prepared using a hydrothermal method. Subsequently, Co<sub>0.85</sub>Se micr...
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MDPI AG
2023-10-01
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| Series: | Micromachines |
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| Online Access: | https://www.mdpi.com/2072-666X/14/10/1905 |
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| author | John Anthuvan Rajesh Jae-Young Kim Soon-Hyung Kang Kwang-Soon Ahn |
| author_facet | John Anthuvan Rajesh Jae-Young Kim Soon-Hyung Kang Kwang-Soon Ahn |
| author_sort | John Anthuvan Rajesh |
| collection | DOAJ |
| description | Microsphere-shaped cobalt selenide (Co<sub>0.85</sub>Se) structures were efficiently synthesized via a two-step hydrothermal process. Initially, cobalt hydroxide fluoride (Co(OH)F) microcrystals were prepared using a hydrothermal method. Subsequently, Co<sub>0.85</sub>Se microsphere-like structures were obtained through selenization. Compared to Co(OH)F, the microsphere-like Co<sub>0.85</sub>Se structure exhibited outstanding catalytic activity for the hydrogen evolution reaction (HER) in a 1.0 M KOH solution. Electrocatalytic experiments demonstrated an exceptional HER performance by the Co<sub>0.85</sub>Se microspheres, characterized by a low overpotential of 148 mV and a Tafel slope of 55.7 mV dec<sup>−1</sup>. Furthermore, the Co<sub>0.85</sub>Se electrocatalyst displayed remarkable long-term stability, maintaining its activity for over 24 h. This remarkable performance is attributed to the excellent electrical conductivity of selenides and the highly electroactive sites present in the Co<sub>0.85</sub>Se structure compared to Co(OH)F, emphasizing its promise for advanced electrocatalytic applications. |
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| id | doaj.art-826e579fad7f40758a32dc903e9c3e55 |
| institution | Directory Open Access Journal |
| issn | 2072-666X |
| language | English |
| last_indexed | 2024-03-10T21:02:40Z |
| publishDate | 2023-10-01 |
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| series | Micromachines |
| spelling | doaj.art-826e579fad7f40758a32dc903e9c3e552023-11-19T17:24:36ZengMDPI AGMicromachines2072-666X2023-10-011410190510.3390/mi14101905Facile Synthesis of Microsphere-like Co<sub>0.85</sub>Se Structures on Nickel Foam for a Highly Efficient Hydrogen Evolution ReactionJohn Anthuvan Rajesh0Jae-Young Kim1Soon-Hyung Kang2Kwang-Soon Ahn3School of Chemical Engineering, Yeungnam University, Gyeongsan 712-749, Republic of KoreaSchool of Chemical Engineering, Yeungnam University, Gyeongsan 712-749, Republic of KoreaDepartment of Chemistry Education, Chonnam National University, Gwangju 500-757, Republic of KoreaSchool of Chemical Engineering, Yeungnam University, Gyeongsan 712-749, Republic of KoreaMicrosphere-shaped cobalt selenide (Co<sub>0.85</sub>Se) structures were efficiently synthesized via a two-step hydrothermal process. Initially, cobalt hydroxide fluoride (Co(OH)F) microcrystals were prepared using a hydrothermal method. Subsequently, Co<sub>0.85</sub>Se microsphere-like structures were obtained through selenization. Compared to Co(OH)F, the microsphere-like Co<sub>0.85</sub>Se structure exhibited outstanding catalytic activity for the hydrogen evolution reaction (HER) in a 1.0 M KOH solution. Electrocatalytic experiments demonstrated an exceptional HER performance by the Co<sub>0.85</sub>Se microspheres, characterized by a low overpotential of 148 mV and a Tafel slope of 55.7 mV dec<sup>−1</sup>. Furthermore, the Co<sub>0.85</sub>Se electrocatalyst displayed remarkable long-term stability, maintaining its activity for over 24 h. This remarkable performance is attributed to the excellent electrical conductivity of selenides and the highly electroactive sites present in the Co<sub>0.85</sub>Se structure compared to Co(OH)F, emphasizing its promise for advanced electrocatalytic applications.https://www.mdpi.com/2072-666X/14/10/1905Co<sub>0.85</sub>Sehydrothermalselenizationhydrogen evolution reactionelectrocatalytic activity |
| spellingShingle | John Anthuvan Rajesh Jae-Young Kim Soon-Hyung Kang Kwang-Soon Ahn Facile Synthesis of Microsphere-like Co<sub>0.85</sub>Se Structures on Nickel Foam for a Highly Efficient Hydrogen Evolution Reaction Micromachines Co<sub>0.85</sub>Se hydrothermal selenization hydrogen evolution reaction electrocatalytic activity |
| title | Facile Synthesis of Microsphere-like Co<sub>0.85</sub>Se Structures on Nickel Foam for a Highly Efficient Hydrogen Evolution Reaction |
| title_full | Facile Synthesis of Microsphere-like Co<sub>0.85</sub>Se Structures on Nickel Foam for a Highly Efficient Hydrogen Evolution Reaction |
| title_fullStr | Facile Synthesis of Microsphere-like Co<sub>0.85</sub>Se Structures on Nickel Foam for a Highly Efficient Hydrogen Evolution Reaction |
| title_full_unstemmed | Facile Synthesis of Microsphere-like Co<sub>0.85</sub>Se Structures on Nickel Foam for a Highly Efficient Hydrogen Evolution Reaction |
| title_short | Facile Synthesis of Microsphere-like Co<sub>0.85</sub>Se Structures on Nickel Foam for a Highly Efficient Hydrogen Evolution Reaction |
| title_sort | facile synthesis of microsphere like co sub 0 85 sub se structures on nickel foam for a highly efficient hydrogen evolution reaction |
| topic | Co<sub>0.85</sub>Se hydrothermal selenization hydrogen evolution reaction electrocatalytic activity |
| url | https://www.mdpi.com/2072-666X/14/10/1905 |
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