Nanoneedles of Mixed Transition Metal Phosphides as Bifunctional Catalysts for Electrocatalytic Water Splitting in Alkaline Media
In this work, mixed Ni/Co and Ni/Fe metal phosphides with different metal ratios were synthesized through the phosphidization of high-surface-area hydroxides grown hydrothermally on carbon cloth. The materials were characterized by means of X-ray photoemission spectroscopy, X-ray diffraction, energy...
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-02-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/13/4/683 |
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| author | Davide Salvò Dario Mosconi Alevtina Neyman Maya Bar-Sadan Laura Calvillo Gaetano Granozzi Mattia Cattelan Stefano Agnoli |
| author_facet | Davide Salvò Dario Mosconi Alevtina Neyman Maya Bar-Sadan Laura Calvillo Gaetano Granozzi Mattia Cattelan Stefano Agnoli |
| author_sort | Davide Salvò |
| collection | DOAJ |
| description | In this work, mixed Ni/Co and Ni/Fe metal phosphides with different metal ratios were synthesized through the phosphidization of high-surface-area hydroxides grown hydrothermally on carbon cloth. The materials were characterized by means of X-ray photoemission spectroscopy, X-ray diffraction, energy dispersive X-ray analysis, and electron microscopies. The electrocatalytic performance in the electrochemical water splitting was tested in alkaline media. With the aim of determining the chemical stability of the mixed phosphides and the possible changes undergone under catalytic conditions, the materials were characterized before and after the electrochemical tests. The best performances in the hydrogen evolution reaction were achieved when synergic interactions are established among the metal centers, as suggested by the outstanding performances (50 mV to achieve 10 mA/cm<sup>2</sup>) of materials containing the highest amount of ternary compounds, i.e., NiCoP and NiFeP. The best performances in the oxygen evolution reaction were reached by the Ni-Fe materials. Under these conditions, it was demonstrated that a strong oxidation of the surface and the dissolution of the phosphide/phosphate component takes place, with the consequent formation of the corresponding metal oxides and hydroxides. |
| first_indexed | 2024-03-11T08:20:15Z |
| format | Article |
| id | doaj.art-d5399b1a717545e1b7e52b3f71156fa1 |
| institution | Directory Open Access Journal |
| issn | 2079-4991 |
| language | English |
| last_indexed | 2024-03-11T08:20:15Z |
| publishDate | 2023-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Nanomaterials |
| spelling | doaj.art-d5399b1a717545e1b7e52b3f71156fa12023-11-16T22:27:31ZengMDPI AGNanomaterials2079-49912023-02-0113468310.3390/nano13040683Nanoneedles of Mixed Transition Metal Phosphides as Bifunctional Catalysts for Electrocatalytic Water Splitting in Alkaline MediaDavide Salvò0Dario Mosconi1Alevtina Neyman2Maya Bar-Sadan3Laura Calvillo4Gaetano Granozzi5Mattia Cattelan6Stefano Agnoli7Department of Chemical Sciences, University of Padova, Via Marzolo 1, 35131 Padova, ItalyDepartment of Chemical Sciences, University of Padova, Via Marzolo 1, 35131 Padova, ItalyDepartment of Chemistry, Ben Gurion University, Beer Sheva 84105, IsraelDepartment of Chemistry, Ben Gurion University, Beer Sheva 84105, IsraelDepartment of Chemical Sciences, University of Padova, Via Marzolo 1, 35131 Padova, ItalyDepartment of Chemical Sciences, University of Padova, Via Marzolo 1, 35131 Padova, ItalyDepartment of Chemical Sciences, University of Padova, Via Marzolo 1, 35131 Padova, ItalyDepartment of Chemical Sciences, University of Padova, Via Marzolo 1, 35131 Padova, ItalyIn this work, mixed Ni/Co and Ni/Fe metal phosphides with different metal ratios were synthesized through the phosphidization of high-surface-area hydroxides grown hydrothermally on carbon cloth. The materials were characterized by means of X-ray photoemission spectroscopy, X-ray diffraction, energy dispersive X-ray analysis, and electron microscopies. The electrocatalytic performance in the electrochemical water splitting was tested in alkaline media. With the aim of determining the chemical stability of the mixed phosphides and the possible changes undergone under catalytic conditions, the materials were characterized before and after the electrochemical tests. The best performances in the hydrogen evolution reaction were achieved when synergic interactions are established among the metal centers, as suggested by the outstanding performances (50 mV to achieve 10 mA/cm<sup>2</sup>) of materials containing the highest amount of ternary compounds, i.e., NiCoP and NiFeP. The best performances in the oxygen evolution reaction were reached by the Ni-Fe materials. Under these conditions, it was demonstrated that a strong oxidation of the surface and the dissolution of the phosphide/phosphate component takes place, with the consequent formation of the corresponding metal oxides and hydroxides.https://www.mdpi.com/2079-4991/13/4/683water splittingHEROERphosphide |
| spellingShingle | Davide Salvò Dario Mosconi Alevtina Neyman Maya Bar-Sadan Laura Calvillo Gaetano Granozzi Mattia Cattelan Stefano Agnoli Nanoneedles of Mixed Transition Metal Phosphides as Bifunctional Catalysts for Electrocatalytic Water Splitting in Alkaline Media Nanomaterials water splitting HER OER phosphide |
| title | Nanoneedles of Mixed Transition Metal Phosphides as Bifunctional Catalysts for Electrocatalytic Water Splitting in Alkaline Media |
| title_full | Nanoneedles of Mixed Transition Metal Phosphides as Bifunctional Catalysts for Electrocatalytic Water Splitting in Alkaline Media |
| title_fullStr | Nanoneedles of Mixed Transition Metal Phosphides as Bifunctional Catalysts for Electrocatalytic Water Splitting in Alkaline Media |
| title_full_unstemmed | Nanoneedles of Mixed Transition Metal Phosphides as Bifunctional Catalysts for Electrocatalytic Water Splitting in Alkaline Media |
| title_short | Nanoneedles of Mixed Transition Metal Phosphides as Bifunctional Catalysts for Electrocatalytic Water Splitting in Alkaline Media |
| title_sort | nanoneedles of mixed transition metal phosphides as bifunctional catalysts for electrocatalytic water splitting in alkaline media |
| topic | water splitting HER OER phosphide |
| url | https://www.mdpi.com/2079-4991/13/4/683 |
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