Platinum-complexed phosphorous-doped carbon nitride for electrocatalytic hydrogen evolution
| Autor: | Shaowei Chen, Frank Bridges, Rene Mercado, Jasleen Sandhu, Zahra Azhar, Rafael Cazares, Qiming Liu, Forrest Nichols |
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| Rok vydání: | 2022 |
| Předmět: |
Materials science
Hydrogen Renewable Energy Sustainability and the Environment Inorganic chemistry Ammonium hexafluorophosphate chemistry.chemical_element General Chemistry Overpotential Nitride Electrocatalyst chemistry.chemical_compound chemistry Reversible hydrogen electrode General Materials Science Platinum Carbon nitride |
| Zdroj: | Journal of Materials Chemistry A. 10:5962-5970 |
| ISSN: | 2050-7496 2050-7488 |
| Popis: | Sustainable hydrogen gas production is critical for future fuel infrastructure. Here, a series of phosphorous-doped carbon nitride materials were synthesized by thermal annealing of urea and ammonium hexafluorophosphate, and platinum was atomically dispersed within the structural scaffold by thermal refluxing with Zeise's salt forming Pt–N/P/Cl coordination interactions, as manifested in X-ray photoelectron and absorption spectroscopic measurements. The resulting materials were found to exhibit markedly enhanced electrocatalytic activity towards the hydrogen evolution reaction (HER) in acidic media, as compared to the P-free counterpart. This was accounted for by P doping that led to a significantly improved charge carrier density within C3N4, and the sample with the optimal P content showed an overpotential of only −22 mV to reach the current density of 10 mA cm−2, lower than that of commercial Pt/C (−26 mV), and a mass activity (7.1 mA μg−1Pt at −70 mV vs. reversible hydrogen electrode) nearly triple that of the latter. Results from the present study highlight the significance of P doping in the manipulation of the electronic structures of metal/carbon nitride nanocomposites for high-performance HER electrocatalysis. |
| Databáze: | OpenAIRE |
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