Ultramicroelectrode Studies of Self-Terminated Nickel Electrodeposition and Nickel Hydroxide Formation upon Water Reduction.

ABSTRACT: The interaction between electrodeposition of Ni and electrolyte breakdown, namely the hydrogen evolution reaction (HER) via H₃O⁺ and H₂O reduction, was investigated under well-defined mass transport conditions using ultramicroelectrodes (UME's) coupled with optical imaging, generation/collection scanning electrochemical microscopy (G/C-SECM), and preliminary microscale pH measurements. For 5 mmol/L NiCl₂ + 0.1 mol/L NaCl, pH 3.0, electrolytes, the voltammetric current at modest overpotentials, i.e., between -0.6 V and -1.4 V vs. Ag/AgCl, was distributed between metal deposition and H₃O⁺ reduction, with both reactions reaching mass transport limited current values. At more negative potentials, an unusual sharp c

SUBMITTER: Ritzert NL 

PROVIDER: S-EPMC5312800 | biostudies-literature | 2016 Dec

REPOSITORIES: biostudies-literature