title: Electrodeposition of tantalum on carbon black in non-aqueous solution and its electrocatalytic properties.
abstract: In this work, we synthesized tantalum (Ta) nanoclusters on carbon black (Ta/CB) via simple electrodeposition in non-aqueous solvent, acetonitrile (ACN) at ambient temperature. Transmission electron microscopy (TEM) images showed that the electrodeposited Ta nanoclusters consisted of tiny Ta nanoparticles. X-ray photoelectron spectroscopy (XPS) result represented that the outermost Ta formed the native oxide on Ta/CB due to its ambient exposure to air. Electrochemical catalytic properties of prepared Ta/CB on glassy carbon electrode (Ta/CB/GC) were investigated toward reductions of oxygen and hydrogen peroxide, and oxidations of ascorbic acid and dopamine. For oxygen reduction reaction (ORR) in acid, Ta/CB/GC represented a decent electrocatalytic performance which was better or comparable to bare Pt. The operational stability in acidic condition was maintained up to 500 repetitive potential cycles presumably due to the protective native Ta oxide layer. Ta/CB/GC also showed high amperometric sensitivity (4.5 (±0.16) mA mM(-1) cm(-2), n = 5) for reduction of hydrogen peroxide in 0.1 M phosphate buffer solution (PBS, pH 7.4). In addition, Ta/CB/GC was demonstrated for the possibility of simultaneous detection of ascorbic acid and dopamine using differential pulse voltammetry (DPV).
authors: Department of Chemistry & Nano Science, Ewha Womans University, Seoul 03760, Republic of Korea.
authors: Ara
authors: A
authors: Jo
authors: Department of Chemistry & Nano Science, Ewha Womans University, Seoul 03760, Republic of Korea. Electronic address: youngmilee@ewha.ac.kr.
authors: Youngmi
authors: Y
authors: Lee
authors: Department of Chemistry & Nano Science, Ewha Womans University, Seoul 03760, Republic of Korea. Electronic address: cmlee@ewha.ac.kr.
authors: Chongmok
authors: C
authors: Lee
keywords: Electrochemical biosensing; Hydrogen peroxide reduction; Non-aqueous electrodeposition; Oxygen reduction; Tantalum (Ta)