Origin of Electrocatalytic Activity in Amorphous Nickel-Metalloid Electrodeposits
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In: ACS Applied Materials and Interfaces, Vol. 13.2021, No. 20, 26.05.2021, p. 23689-23701.
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TY - JOUR
T1 - Origin of Electrocatalytic Activity in Amorphous Nickel-Metalloid Electrodeposits
AU - Sarac, Baran
AU - Karazehir, Tolga
AU - Micusik, Matej
AU - Halkali, Celine
AU - Gutnik, Dominik
AU - Omastova, Maria
AU - Sarac, A. Sezai
AU - Eckert, Jürgen
N1 - Publisher Copyright: © 2021 American Chemical Society.
PY - 2021/5/26
Y1 - 2021/5/26
N2 - In transition metal-based alloys, the nonlinearity of the current at large cathodic potentials reduces the credibility of the linear Tafel slopes for the evaluation of electrocatalytic hydrogen activity. High-precision nonlinear fitting at low current densities describing the kinetics of electrochemical reactions due to charge transfer can overcome this challenge. To show its effectiveness, we introduce a glassy alloy with a highly asymmetric energy barrier: amorphous NiP electrocoatings (with different C and O inclusions) via changing the applied DC and pulsed current and NaH2PO2 content. The highest hydrogen evolution reaction (HER) activity with the lowest cathodic transfer coefficient α = 0.130 with high J0 = −1.07 mA cm–2 and the largest surface areas without any porosity are observed for the pulsed current deposition. The calculated α has a direct relation with morphology, composition, chemical state and coating thickness defined by the electrodeposition conditions. Here, a general evaluation criterion with practicality in assessment and high accuracy for electrocatalytic reactions applicable to different metallic alloy systems is presented.
AB - In transition metal-based alloys, the nonlinearity of the current at large cathodic potentials reduces the credibility of the linear Tafel slopes for the evaluation of electrocatalytic hydrogen activity. High-precision nonlinear fitting at low current densities describing the kinetics of electrochemical reactions due to charge transfer can overcome this challenge. To show its effectiveness, we introduce a glassy alloy with a highly asymmetric energy barrier: amorphous NiP electrocoatings (with different C and O inclusions) via changing the applied DC and pulsed current and NaH2PO2 content. The highest hydrogen evolution reaction (HER) activity with the lowest cathodic transfer coefficient α = 0.130 with high J0 = −1.07 mA cm–2 and the largest surface areas without any porosity are observed for the pulsed current deposition. The calculated α has a direct relation with morphology, composition, chemical state and coating thickness defined by the electrodeposition conditions. Here, a general evaluation criterion with practicality in assessment and high accuracy for electrocatalytic reactions applicable to different metallic alloy systems is presented.
KW - amorphous alloys
KW - Butler-Volmer equation
KW - electrodeposition
KW - energy-dispersive X-ray analysis
KW - linear sweep voltammetry
KW - morphology
KW - nickel phosphide
KW - Raman spectroscopy
UR - http://www.scopus.com/inward/record.url?scp=85106365122&partnerID=8YFLogxK
U2 - 10.1021/acsami.1c03007
DO - 10.1021/acsami.1c03007
M3 - Article
C2 - 33982559
AN - SCOPUS:85106365122
VL - 13.2021
SP - 23689
EP - 23701
JO - ACS Applied Materials and Interfaces
JF - ACS Applied Materials and Interfaces
SN - 1944-8244
IS - 20
ER -
