TY - JOUR
T1 - Yolk–Shell-Structured Cu/Fe@γ-Fe2O3 Nanoparticles Loaded Graphitic Porous Carbon for the Oxygen Reduction Reaction
AU - Wang, Meiwen
AU - Su, Chao
AU - Saunders, Martin
AU - Liang, Ji
AU - Shao, Zongping
AU - Wang, Shaobin
AU - Liu, Jian
PY - 2017/10/1
Y1 - 2017/10/1
N2 - Core–shell Cu/γ-Fe2O3@C and yolk–shell-structured Cu/Fe@γ-Fe2O3@C particles are prepared by a facile synthesis method using copper oxide as template particles, resorcinol-formaldehyde as the carbon precursor, and iron nitrate solution as the iron source via pyrolysis. With increasing carbonization temperature and time, solid γ-Fe2O3 cores are formed and then transformed into Fe@γ-Fe2O3 yolk–shell-structured particles via Ostwald ripening under nitrogen gas flow. The composition variations are studied, and the formation mechanism is proposed for the generation of the hollow and yolk–shell-structured metal and metal oxides. Moreover, highly graphitic carbons can be obtained by etching the metal and metal oxide nanoparticles through an acid treatment. The electrocatalytic activity for oxygen reduction reaction is investigated on Cu/γ-Fe2O3@C, Cu/Fe@γ-Fe2O3@C, and graphitic carbons, indicating comparable or even superior performance to other Fe-based nanocatalysts.
AB - Core–shell Cu/γ-Fe2O3@C and yolk–shell-structured Cu/Fe@γ-Fe2O3@C particles are prepared by a facile synthesis method using copper oxide as template particles, resorcinol-formaldehyde as the carbon precursor, and iron nitrate solution as the iron source via pyrolysis. With increasing carbonization temperature and time, solid γ-Fe2O3 cores are formed and then transformed into Fe@γ-Fe2O3 yolk–shell-structured particles via Ostwald ripening under nitrogen gas flow. The composition variations are studied, and the formation mechanism is proposed for the generation of the hollow and yolk–shell-structured metal and metal oxides. Moreover, highly graphitic carbons can be obtained by etching the metal and metal oxide nanoparticles through an acid treatment. The electrocatalytic activity for oxygen reduction reaction is investigated on Cu/γ-Fe2O3@C, Cu/Fe@γ-Fe2O3@C, and graphitic carbons, indicating comparable or even superior performance to other Fe-based nanocatalysts.
KW - graphitic porous carbon
KW - nanocatalysts
KW - oxygen reduction reaction (ORR)
KW - yolk–shell particles
KW - γ-FeO
UR - http://www.scopus.com/inward/record.url?scp=85026637574&partnerID=8YFLogxK
U2 - 10.1002/ppsc.201700158
DO - 10.1002/ppsc.201700158
M3 - Article
AN - SCOPUS:85026637574
SN - 0934-0866
VL - 34
JO - Particle and Particle Systems Characterization
JF - Particle and Particle Systems Characterization
IS - 10
M1 - 1700158
ER -