TY - JOUR
T1 - One-pot electrodeposition of cobalt flower-decorated silver nanotrees for oxygen reduction reaction
AU - Cho, Yun Bin
AU - Moon, Sinyoung
AU - Lee, Chongmok
AU - Lee, Youngmi
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 ( 2014R1A2A2A05003769 for YL) and ( 2014R1A2A2A01005479 for CL).
Publisher Copyright:
© 2016 Elsevier B.V.
PY - 2017/2/1
Y1 - 2017/2/1
N2 - In this paper, we demonstrate a simple fabrication of bimetallic silver (Ag) and cobalt (Co) nanostructures (AgCo) with various Ag to Co relative contents via electrochemical co-deposition. A series of AgCo catalysts was electrodeposited on glassy carbon (GC) electrodes at −0.57 V vs. SCE in the deposition solutions, containing Ag precursor, Co precursor, Triton X-100, and 0.3 M KNO 3 aqueous solution, with various Ag to Co precursor concentration ratios (1:x, x was varied from 3 to 11). The films, deposited with the total deposition charge of 0.042C, were denoted as Ag 1 Co x . SEM and TEM analyses showed that Ag 1 Co x formed a structure consisted of flower-like Co grown on tree-like Ag backbones while it had more Co flowers with a greater x. The ORR activities were examined in 0.1 M NaOH solution with rotating disk electrode (RDE) voltammetry and Ag 1 Co 7 showed the best catalytic activity. The co-deposition mechanism was further investigated by varying the deposition time of Ag 1 Co 7 . At the early stage of deposition, Ag-tree branches were formed predominantly, followed by the growth of flower-like Co nanostructures on the Ag nanotrees: More Co flowers were produced on Ag backbones with longer deposition time, being attributed to both a less negative reduction potential of Ag + to Ag than Co 2+ to Co and promoted Co 2+ reduction on the initially formed Ag surface. Ag 1 Co 7 electrodeposited for 200 s, consisted of ∼14% Co, showed the greatest ORR catalytic activity which was better or comparable to noble metal Pt.
AB - In this paper, we demonstrate a simple fabrication of bimetallic silver (Ag) and cobalt (Co) nanostructures (AgCo) with various Ag to Co relative contents via electrochemical co-deposition. A series of AgCo catalysts was electrodeposited on glassy carbon (GC) electrodes at −0.57 V vs. SCE in the deposition solutions, containing Ag precursor, Co precursor, Triton X-100, and 0.3 M KNO 3 aqueous solution, with various Ag to Co precursor concentration ratios (1:x, x was varied from 3 to 11). The films, deposited with the total deposition charge of 0.042C, were denoted as Ag 1 Co x . SEM and TEM analyses showed that Ag 1 Co x formed a structure consisted of flower-like Co grown on tree-like Ag backbones while it had more Co flowers with a greater x. The ORR activities were examined in 0.1 M NaOH solution with rotating disk electrode (RDE) voltammetry and Ag 1 Co 7 showed the best catalytic activity. The co-deposition mechanism was further investigated by varying the deposition time of Ag 1 Co 7 . At the early stage of deposition, Ag-tree branches were formed predominantly, followed by the growth of flower-like Co nanostructures on the Ag nanotrees: More Co flowers were produced on Ag backbones with longer deposition time, being attributed to both a less negative reduction potential of Ag + to Ag than Co 2+ to Co and promoted Co 2+ reduction on the initially formed Ag surface. Ag 1 Co 7 electrodeposited for 200 s, consisted of ∼14% Co, showed the greatest ORR catalytic activity which was better or comparable to noble metal Pt.
KW - Bimetallic electrocatalyst
KW - Cobalt
KW - Nanotree
KW - Oxygen reduction reaction
KW - Silver
UR - http://www.scopus.com/inward/record.url?scp=84993989933&partnerID=8YFLogxK
U2 - 10.1016/j.apsusc.2016.10.068
DO - 10.1016/j.apsusc.2016.10.068
M3 - Article
AN - SCOPUS:84993989933
SN - 0169-4332
VL - 394
SP - 267
EP - 274
JO - Applied Surface Science
JF - Applied Surface Science
ER -