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Operando Raman interrogation of the synthesis and activation of a CoSe HER catalyst

Rinaldi, Katherine Z. and Carim, Azhar I. and Lewis, Nathan S. (2018) Operando Raman interrogation of the synthesis and activation of a CoSe HER catalyst. In: 255th American Chemical Society National Meeting & Exposition, 18-22 March 2018, New Orleans, LA.

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A highly active cobalt selenide electrocatalyst for the hydrogen-evolution reaction (HER) in acidic media was electrochem. synthesized using a two-step process consisting of potentiostatic electrodeposition from aq. soln. followed by galvanostatic conditioning in the HER potential regime. Ex-situ Raman spectroscopy and energy-dispersive X-Ray spectroscopy indicated that the initial deposition step generated a material contg. CoSe as well as Se in multiple phases. Operando Raman anal. during the initial galvanostatic operation indicated a structural evolution of the Se phases including the partial elimination of one phase. Despite operating in the HER regime, the faradaic efficiency towards hydrogen evolution was low until this structural change was complete, demonstrating the in situ realization of the active catalytic material. This resulting catalyst required an overpotential (η) < 150 mV to drive the benchmark c.d. of -10 mA cm^(-2) in 0.5 M H_2SO_4. Stability anal. including continuous galvnostatic operation as well as simulated intermittent operation indicated significant electrochem. robustness in the acidic operating environment.

Item Type:Conference or Workshop Item (Paper)
Related URLs:
URLURL TypeDescription Website
Rinaldi, Katherine Z.0000-0002-0746-2852
Carim, Azhar I.0000-0003-3630-6872
Lewis, Nathan S.0000-0001-5245-0538
Additional Information:© 2018 American Chemical Society.
Record Number:CaltechAUTHORS:20180413-160048649
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:85857
Deposited By: Tony Diaz
Deposited On:13 Apr 2018 23:15
Last Modified:24 Nov 2020 22:20

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