Origin of Electrocatalytic Activity in Amorphous Nickel-Metalloid Electrodeposits
[ X ]
Tarih
2021
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
American Chemical Society
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
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 ? = 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 ? 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. © 2021 American Chemical Society.
Açıklama
Anahtar Kelimeler
amorphous alloys, Butler-Volmer equation, electrodeposition, energy-dispersive X-ray analysis, linear sweep voltammetry, morphology, nickel phosphide, Raman spectroscopy
Kaynak
ACS Applied Materials and Interfaces
WoS Q Değeri
Scopus Q Değeri
Q1
Cilt
13
Sayı
20
