A metastable hexagonal-IrSe2 with activated basal-plane selenium atoms for efficient hydrogen electrocatalysis
Developing novel layered transition metal dichalcogenides (TMDs) has gained tremendous interest due to their attractive physicochemical properties and promising applications. Herein, for the first, quasi-monolayered hexagonal-IrSe2 (h-IrSe2) nanosheets with metastable two-dimensional structure to th...
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Elsevier
2025-01-01
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| Series: | Next Materials |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2949822824003617 |
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| author | Luhong Fu Fulin Yang Yunbo Li Yuanmeng Zhao Pengyu Han Hongnan Jia Chaoyi Yang Wei Luo |
| author_facet | Luhong Fu Fulin Yang Yunbo Li Yuanmeng Zhao Pengyu Han Hongnan Jia Chaoyi Yang Wei Luo |
| author_sort | Luhong Fu |
| collection | DOAJ |
| description | Developing novel layered transition metal dichalcogenides (TMDs) has gained tremendous interest due to their attractive physicochemical properties and promising applications. Herein, for the first, quasi-monolayered hexagonal-IrSe2 (h-IrSe2) nanosheets with metastable two-dimensional structure to the thermodynamically stable orthorhombic counterpart (o-IrSe2) have been prepared via the colloidal synthesis. Atomic-resolution transmission electron microscopy and spectroscopic characterizations confirm the 1 T configuration of the as-synthesized h-IrSe2, constructed from Ir-Se octahedra units. The metastable h-IrSe2 exhibits significantly enhanced performance for hydrogen evolution/oxidation reactions in alkaline media compared to o-IrSe2, even surpassing the metallic Ir nanoparticles. In situ Raman spectra and theoretical calculations reveal that the Se sites on the basal-plane of h-IrSe2 are the actual active sites. The obtained quasi-monolayered lamellar morphology of h-IrSe2 provides abundant basal-planes, thereby leading to increased effective electrochemical active area and enhanced mass activity. The activation of the basal-plane Se atoms could be attributed to the reduced local interband energy separation between the lowest empty d-band on Ir and the occupied p-band on Se, which is responsible for the optimized binding strength of the key intermediates during hydrogen electrocatalysis. |
| format | Article |
| id | doaj-art-aeb80158341e48cbbc8a092ee63efbd6 |
| institution | DOAJ |
| issn | 2949-8228 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Elsevier |
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| series | Next Materials |
| spelling | doaj-art-aeb80158341e48cbbc8a092ee63efbd62025-08-20T03:02:07ZengElsevierNext Materials2949-82282025-01-01610046310.1016/j.nxmate.2024.100463A metastable hexagonal-IrSe2 with activated basal-plane selenium atoms for efficient hydrogen electrocatalysisLuhong Fu0Fulin Yang1Yunbo Li2Yuanmeng Zhao3Pengyu Han4Hongnan Jia5Chaoyi Yang6Wei Luo7Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, ChinaFaculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China; Corresponding authors.College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, ChinaCollege of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, ChinaCollege of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, ChinaCollege of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, ChinaCollege of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, ChinaCollege of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, China; Corresponding authors.Developing novel layered transition metal dichalcogenides (TMDs) has gained tremendous interest due to their attractive physicochemical properties and promising applications. Herein, for the first, quasi-monolayered hexagonal-IrSe2 (h-IrSe2) nanosheets with metastable two-dimensional structure to the thermodynamically stable orthorhombic counterpart (o-IrSe2) have been prepared via the colloidal synthesis. Atomic-resolution transmission electron microscopy and spectroscopic characterizations confirm the 1 T configuration of the as-synthesized h-IrSe2, constructed from Ir-Se octahedra units. The metastable h-IrSe2 exhibits significantly enhanced performance for hydrogen evolution/oxidation reactions in alkaline media compared to o-IrSe2, even surpassing the metallic Ir nanoparticles. In situ Raman spectra and theoretical calculations reveal that the Se sites on the basal-plane of h-IrSe2 are the actual active sites. The obtained quasi-monolayered lamellar morphology of h-IrSe2 provides abundant basal-planes, thereby leading to increased effective electrochemical active area and enhanced mass activity. The activation of the basal-plane Se atoms could be attributed to the reduced local interband energy separation between the lowest empty d-band on Ir and the occupied p-band on Se, which is responsible for the optimized binding strength of the key intermediates during hydrogen electrocatalysis.http://www.sciencedirect.com/science/article/pii/S2949822824003617hexagonal-IrSe2Transition metal dichalcogenideTwo-dimensionalMetastable phaseHydrogen electrocatalysis |
| spellingShingle | Luhong Fu Fulin Yang Yunbo Li Yuanmeng Zhao Pengyu Han Hongnan Jia Chaoyi Yang Wei Luo A metastable hexagonal-IrSe2 with activated basal-plane selenium atoms for efficient hydrogen electrocatalysis Next Materials hexagonal-IrSe2 Transition metal dichalcogenide Two-dimensional Metastable phase Hydrogen electrocatalysis |
| title | A metastable hexagonal-IrSe2 with activated basal-plane selenium atoms for efficient hydrogen electrocatalysis |
| title_full | A metastable hexagonal-IrSe2 with activated basal-plane selenium atoms for efficient hydrogen electrocatalysis |
| title_fullStr | A metastable hexagonal-IrSe2 with activated basal-plane selenium atoms for efficient hydrogen electrocatalysis |
| title_full_unstemmed | A metastable hexagonal-IrSe2 with activated basal-plane selenium atoms for efficient hydrogen electrocatalysis |
| title_short | A metastable hexagonal-IrSe2 with activated basal-plane selenium atoms for efficient hydrogen electrocatalysis |
| title_sort | metastable hexagonal irse2 with activated basal plane selenium atoms for efficient hydrogen electrocatalysis |
| topic | hexagonal-IrSe2 Transition metal dichalcogenide Two-dimensional Metastable phase Hydrogen electrocatalysis |
| url | http://www.sciencedirect.com/science/article/pii/S2949822824003617 |
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