Cation distribution: a descriptor for hydrogen evolution electrocatalysis on transition-metal spinels

Gomaa, Aya K.; Zonkol, Maram G.; Khedr, Ghada E.; Allam, Nageh K.

doi:10.1039/d4ey00121d

EES. Catal.

2024

DOI: 10.1039/d4ey00121d

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Cation distribution: a descriptor for hydrogen evolution electrocatalysis on transition-metal spinels

Aya K. Gomaa,

Maram G. Zonkol,

Ghada E. Khedr

et al.

Abstract: Exploring cost-effective and efficient electrocatalysts for the hydrogen evolution reaction (HER) is essential for realizing green energy technologies such as water electrolyzers and fuel cells. To this end, identifying descriptors...

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Cited by 2 publications

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Surface Engineering of Stainless-Steel 316L and 304L Electrodes for Hydrogen Production in Alkaline and Saline Water

Heiba,

Omran,

Abd El Hamid

et al. 2024

Energy Fuels

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Although green hydrogen is a promising future energy carrier, mass production of green hydrogen via water electrolysis is still contingent upon identifying cost-effective, scalable, and durable electrocatalysts. This study demonstrates a facile, controllable, and scalable process to modify stainless steel's morphology and chemical composition (SS) via anodic oxidation (anodization). Anodization was performed in an ethylene glycol/H 2 SO 4 /NH 4 F/MeOH-based bath to enhance the surface roughness, while the presence and absence of Cr, Fe, and Ni metal ions in the anodization bath were used to engineer the surface chemical composition. An effective cyclic voltammetry (CV)-based electrochemical activation step was implemented to enhance the electrocatalytic activity of the SS electrodes. The X-ray photoelectron spectroscopy (XPS) analysis confirmed the successful surface oxide reduction and Cr 6+ removal. The anodization bath containing Ni and Fe nitrates resulted in highly rough surfaces with electrochemical active surface areas (ECSA) of 8.4 and 9.8 cm −2 with a high degree of homogeneity for both SS 316L and SS 304L alloys, respectively. Upon their use as hydrogen evolution catalysts in both alkaline (1 M KOH) and neutral (0.5 M NaCl) aqueous electrolytes, the anodized SS 316L electrode, at the best conditions, exhibited an overpotential of 256 mV at 10 mA/cm 2 with a decrease in the overpotential and Tafel slope values of 112 and 32 mV/ dec, respectively, compared to that of the as-received SS 316L in alkaline water. The hydrogen evolution reaction (HER) was found to follow the Volmer−Heyrovsky mechanism in both alkaline and neutral water, with a difference in the adsorbed hydrogen binding energy, causing a dramatic increase in the overpotential in neutral water compared to the alkaline water.

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Surface Engineering of Stainless-Steel 316L and 304L Electrodes for Hydrogen Production in Alkaline and Saline Water

Heiba,

Omran,

Abd El Hamid

et al. 2024

Energy Fuels

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Effect of solvothermal synthesis parameters on the crystallite size and atomic structure of cobalt iron oxide nanoparticles

Aalling-Frederiksen,

Pittkowski,

Anker

et al. 2024

Nanoscale Adv.

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Cation distribution: a descriptor for hydrogen evolution electrocatalysis on transition-metal spinels

Abstract: Exploring cost-effective and efficient electrocatalysts for the hydrogen evolution reaction (HER) is essential for realizing green energy technologies such as water electrolyzers and fuel cells. To this end, identifying descriptors...

Cited by 2 publications

References 79 publications

Surface Engineering of Stainless-Steel 316L and 304L Electrodes for Hydrogen Production in Alkaline and Saline Water

Surface Engineering of Stainless-Steel 316L and 304L Electrodes for Hydrogen Production in Alkaline and Saline Water

Effect of solvothermal synthesis parameters on the crystallite size and atomic structure of cobalt iron oxide nanoparticles

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