Electrochemical Behavior of Hydrazine Borane in Methanol Solution

Date

2014-01-01

Author

Ozhava, Derya
Önal, Ahmet Muhtar
Özkar, Saim

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Electrochemical behavior of hydrazine borane (HB) was investigated on gold electrode in 0.5 M LiClO4 solution in methanol using cyclic voltammetry, electrochemical impedance spectroscopy (EIS) and chronoamperometry. Two irreversible peaks at 164 and 530 mV are attributed to direct electro-oxidation of HB on gold electrode in methanol. Both EIS results and CV data at different scan rates indicate a diffusion controlled electron transfer reaction. Furthermore, the Tafel slope (b = 0.191 V) and charge transfer coefficient (alpha = 0.69) were obtained for the HB oxidation at the gold/solution interface. A possible ECE (electrochemical-chemical-electrochemical) mechanism is proposed for the irreversible two electron transfer reaction. This mechanism was also confirmed by the results of Nicholson-Shain test. Additionally, diffusion coefficient of HB was found to be 1.6 x 10(-5) cm(2).s(-1) using chronoamperometry. First oxidation peak of HB appears at a lower potential than that of ammonia borane (AB), clearly indicating that HB is a stronger reducing agent as compared to AB in methanol solution. (C) 2014 The Electrochemical Society. All rights reserved.

Subject Keywords

Renewable Energy, Sustainability and the Environment, Electrochemistry, Materials Chemistry, Electronic, Optical and Magnetic Materials, Surfaces, Coatings and Films, Condensed Matter Physics

URI

https://hdl.handle.net/11511/40009

Collections

Department of Chemistry, Article