NDLI: The Formation of Surface Oxides on Nickel in Oxalate-Containing Alkaline Media

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The Formation of Surface Oxides on Nickel in Oxalate-Containing Alkaline Media

Content Provider	Springer Nature Link
Author	van Drunen, Julia Barbosa, Amaury F. B. Tremiliosi Filho, Germano
Copyright Year	2015
Abstract	The electrochemical formation of α-Ni(OH)$_{2}$ and NiOOH in the presence of adsorbed oxalate in alkaline media is studied under well-controlled experimental conditions that include the variation of the system temperature (T = −10 to 20 °C), the scan rate (v = 20, 150, and 200 mV s$^{−1}$), and the concentration of supporting electrolyte (0.10 and 0.50 M KOH). The studies are carried out using cyclic voltammetry (CV) with polycrystalline bulk nickel and nickel foams. In situ infrared spectroscopy with voltammetry confirms the adsorption of oxalate to the surface of nickel in the 0.10 to 0.30 V potential window, concurrent with the formation of the α-Ni(OH)$_{2}$ species. The presence of oxalate in the system increases the charge density (Q) for the formation of both the α-Ni(OH)$_{2}$ and NiOOH surface oxides. The Q values calculated under various conditions indicate that the presence of oxalate in the system encourages the formation of a full single monolayer (ML) of NiOOH in the first CV scan. Measurements carried out at room temperature demonstrate that an increase in v decreases the Q values for NiOOH in the presence of oxalate to minimum values achieved at v ≥150 mV s$^{−1}$. An increase of KOH concentration results in the formation of a thicker layer of NiOOH both in the presence and absence of oxalate. The Q values of NiOOH reduction in conditions that favor the formation of one complete monolayer of NiOOH are used to calculate the specific surface areas of open-cell nickel foams. The calculation of electrochemical surface area using this method is discussed and evaluated with respect to calculations based on the charge of α-Ni(OH)$_{2}$ formation.
Starting Page	481
Ending Page	491
Page Count	11
File Format	PDF
ISSN	18682529
Journal	Electrocatalysis
Volume Number	6
Issue Number	5
e-ISSN	18685994
Language	English
Publisher	Springer US
Publisher Date	2015-07-30
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Nickel hydroxide Nickel oxyhydroxide Nickel foam Electrochemical surface area Oxalate adsorption Oxide surface coverage Electrochemistry Physical Chemistry Catalysis Energy Technology
Content Type	Text
Resource Type	Article
Subject	Electrochemistry

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