| Title: | Controlled synthesis of nickel phosphides in hollow N, P co-doped carbon : In situ transition to (oxy)hydroxide phases during oxygen evolution reaction |
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| Authors: | ID Rios-Ruiz, David (Author)
ID Arevalo-Cid, Pablo (Author)
ID Cebollada, Jesus (Author)
ID Celorrio, Verónica (Author)
ID Čeh, Milan, Institut "Jožef Stefan" (Author)
ID Drev, Sandra, Institut "Jožef Stefan" (Author)
ID Martinez-Huerta, Maria V. (Author) |
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| Files: |  URL - Source URL, visit https://www.mdpi.com/2073-4344/15/3/292
 PDF - Presentation file, download (8,58 MB)
MD5: 50E4154356B9D95B7C6D6EE7D3C6EC0E
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| Language: | English |
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| Typology: | 1.01 - Original Scientific Article |
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| Organization: |  IJS - Jožef Stefan Institute
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| Abstract: | Developing sustainable and efficient electrocatalysts for the oxygen evolution reaction (OER) is crucial for advancing energy storage technologies. This study explored the dual role of phosphorus as a dopant in carbon matrices and a key component in nickel phosphides (Ni2P and Ni12P5), synthesized using dopamine (PDA) and ammonium phosphate as eco-friendly precursors. The phase formation of nickel phosphides was found to be highly dependent on the P/PDA ratio (0.15, 0.3, 0.6, and 0.9), allowing for the selective synthesis of Ni2P or Ni12P5. Operando Raman spectroscopy revealed that both phases undergo surface transformation into nickel (oxy)hydroxide species under OER conditions, yet Ni2P-based catalysts demonstrated superior activity and long-term stability. This enhancement is attributed to efficient electron transfer at the dynamic Ni2P/NiOOH interface. Additionally, hollow nanostructures formed at intermediate P/PDA ratios (≤0.3) via the Kirkendall effect and Ostwald ripening contributed to an increased specific surface area and micropore volume, further improving the catalytic performance. Electrochemical impedance spectroscopy confirmed reduced interfacial resistance and enhanced charge transport. These findings offer new insights into the rational design of high-performance electrocatalysts and propose a green, tunable synthesis approach for advanced energy conversion applications. |
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| Publication status: | Published |
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| Publication version: | Version of Record |
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| Submitted for review: | 05.03.2025 |
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| Article acceptance date: | 14.03.2025 |
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| Publication date: | 20.03.2025 |
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| Publisher: | MDPI |
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| Year of publishing: | 2025 |
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| Number of pages: | 14 str. |
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| Numbering: | Vol. 15, Iss. 3 |
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| Source: | Švica |
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| PID: | 20.500.12556/DiRROS-22543  |
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| UDC: | 544 |
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| ISSN on article: | 2073-4344 |
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| DOI: | 10.3390/catal15030292 |
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| COBISS.SI-ID: | 231445251 |
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| Copyright: | © 2025 by the authors. |
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| Publication date in DiRROS: | 03.06.2025 |
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| Views: | 510 |
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| Downloads: | 254 |
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