| Title: | Materials for sustainable electrochemical energy conversion |
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| Authors: | ID Emin, Saim (Author)
ID Chouki, Takwa (Author)
ID Machreki, Manel (Author) |
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| Files: |  https://sites.google.com/view/mpsd2023/home
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| Language: | English |
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| Work type: | Unknown |
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| Typology: | 1.10 - Published Scientific Conference Contribution Abstract (invited lecture) |
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| Organization: | UNG - University of Nova Gorica
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| Abstract: | The process of hydrogen evolution reaction (HER) through water electrolysis is an important technology for
establishing the so called "hydrogen economy". Here we will cover different systems for electrocatalytic HER.
Transition metal carbides and metal phosphides are alternative to platinum (Pt) and offer excellent electrocatalytic
activity for HER. Pyrolysis of hexacarbonyl tungsten, W(CO)6, in 1-octadecene has been used to prepare colloidal
tungsten, W, nanoparticles (NPs) [1]. The obtained W NPs has been spin-coated on graphite (C) electrodes. Heat
treatment of the W/C electrodes at elevated temperatures (≥ 900°C) allows the preparation of metallic W and
tungsten carbide (W2C@WC) thin films. The obtained W2C@WC electrodes were used for hydrogen evolution
studies (HER) in 0.5M H2SO4. Cyclic voltammetry tests for 1000 cycles showed that W2C@WC exhibit long term
stability without significant drop in current density. The overpotential defined at 10 mA/cm2
is 310 mV vs. RHE
giving an excellent catalytic activity for HER. Iron phosphide electrocatalysts were synthesized using a
triphenylphosphine (TPP) precursor. Different iron phosphide phases were synthesized at 300°C (Fe2P) and at
350°C ( FeP ) [2]. To enhance the catalytic activities of obtained iron phosphide particles heat-treatments were
carried out at elevated temperatures. Annealing at 500°C under reductive atmosphere induced structural changes
in the samples: (i) Fe2P provided a pure Fe3P phase (Fe3P−500°C) and (ii) FeP transformed into a mixture of iron
phosphide phases (Fe2P/FeP−500°C). The lowest electrode potential of 110 mV vs. a reversible hydrogen electrode
(RHE) at 10 mA cm−2 was achieved with Fe2P/FeP−500°C catalyst |
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| Keywords: | Fe2P, electrocatalysis, hydrogen, ammonia |
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| Year of publishing: | 2023 |
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| Number of pages: | Str. 7-8 |
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| PID: | 20.500.12556/RUNG-8693-5a740471-2bea-60b9-ae6d-1d14936222f8  |
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| COBISS.SI-ID: | 177328899 |
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| UDC: | 53 |
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| NUK URN: | URN:SI:UNG:REP:YMGVAFGQ |
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| Publication date in RUNG: | 13.12.2023 |
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| Views: | 1684 |
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| Downloads: | 4 |
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