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Structural dependence of hydrogen evolution reaction on transition metal catalysts sputtered at different temperatures in alkaline media

Journal Article · · International Journal of Hydrogen Energy
 [1];  [1];  [1];  [2];  [1];  [3];  [1]
  1. P. J. Safarik University, Kosice (Slovakia)
  2. P. J. Safarik University, Kosice (Slovakia); Slovak Academy of Sciences, Kosice (Slovakia)
  3. Argonne National Lab. (ANL), Argonne, IL (United States)
In the present article, we studied the catalytic activity of magnetron sputtered Mo, V, Ni, and Co thin films for hydrogen evolution reaction (HER) in the alkaline electrolyte. Here, we find that the HER potentials (η10) of the Mo and V thin film catalysts sputtered at 800 °C shift positive with respect to those of the film catalysts sputtered at 25°C. For Mo metal the observed shift of η10 was 280 mV and for V metal observed shift of η10 was 390 mV. On the other hand, minimal effect of sputtering temperature on both Ni and Co thin film catalyst activity for HER was observed. Structural analysis reveals that Mo and V prepared at 800 °C have uncommon face centered cubic (fcc, 0.74 packing density) structure as opposed to room-temperature sputtered Mo and V thin films which have common body centered cubic (bcc, 0.68 packing density) structure, resulting in significant increases of the packing densities when they are prepared at 800 °C. On the other hand, the high-temperature prepared thin films of Ni and Co retained fcc structures, resulting in no density changes compared to the room-temperature prepared fcc Ni and hexagonal close packed (hcp, 0.74 packing density) Co. Impedance spectroscopy shows that fcc Mo is a better catalyst than fcc Ni, which is considered an industry standard for non-noble pure metal-based catalysts in alkaline media. Stability tests also suggest that fcc Mo thin film catalysts prepared at 800 °C are more durable than fcc Ni thin films. Our study points out that structure phases of catalysts can be a key factor governing the activities of transition metals for HER in alkaline media.
Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; Slovak Research and Development Agency (SRDA)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1902295
Alternate ID(s):
OSTI ID: 1960875
Journal Information:
International Journal of Hydrogen Energy, Journal Name: International Journal of Hydrogen Energy Journal Issue: 63 Vol. 47; ISSN 0360-3199
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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