TY - JOUR
T1 - Electrodeposition of tantalum on carbon black in non-aqueous solution and its electrocatalytic properties
AU - Jo, Ara
AU - Lee, Youngmi
AU - Lee, Chongmok
N1 - Funding Information:
This work was financially supported by the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT and Future Planning ( 2014R1A2A2A01005479 for CL) and ( 2014R1A2A2A05003769 for YL). This study was also supported by the Ewha Womans University scholarship of 2014 for AJ.
Publisher Copyright:
© 2016 Elsevier B.V.
PY - 2016/8/24
Y1 - 2016/8/24
N2 - 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).
AB - 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).
KW - Electrochemical biosensing
KW - Hydrogen peroxide reduction
KW - Non-aqueous electrodeposition
KW - Oxygen reduction
KW - Tantalum (Ta)
UR - http://www.scopus.com/inward/record.url?scp=84973563443&partnerID=8YFLogxK
U2 - 10.1016/j.aca.2016.05.030
DO - 10.1016/j.aca.2016.05.030
M3 - Article
AN - SCOPUS:84973563443
SN - 0003-2670
VL - 933
SP - 59
EP - 65
JO - Analytica Chimica Acta
JF - Analytica Chimica Acta
ER -