Abundant Size-Controlled Cu-Ni(Fe) Alloy Nanoparticles Decorated Reduced Graphene with Enhanced Electrocatalytic Activities for Chloramphenicol. Issue 12 (29th August 2017)

• Record Type: Journal Article
• Authors: Song, Xiaozhe; Xu, Dandan; Shi, Qin; Wang, Fan; Wang, Hui; Bian, Zhaoyong
• Is Part Of: Journal of the Electrochemical Society. Volume 164:Issue 12(2017)
• Page Start: H779
• Page End: H787
• Publication Date: 2017-08-29
• Subjects: chloramphenicol -- Cu-Ni(Fe) alloy -- graphene; Electrochemistry -- Periodicals; 541.3705
• DOI: 10.1149/2.1211712jes
• Languages: English
• ISSNs: 0013-4651

Abstract

Abstract : A graphene series decorated with Cu-Ni(Fe) nanoparticles (NPs) (Cux Ni(Fe)y /G) catalysts with controlled component ratios were fabricated and applied to the electrocatalytic degradation of chloramphenicol (CAP). Cu-Ni(Fe) NPs were decorated on graphene in the sequence that the Cu was added prior to the Ni(Fe) to achieve specialized and stable structures. Cu-Ni(Fe) NPs in Cu0.5 Ni0.5 /G and Cu0.5 Fe0.5 /G had diameters of 4.29 ± 0.03 nm and 4.63 ± 0.04 nm, respectively. Higher peak currents (0.242 mA and 0.221 mA) for H-adsorption, a lower onset potential and higher peak current were achieved in Cu0.5 Ni0.5 /G (−0.045 mA at −0.136 V) and Cu0.5 Fe0.5 /G (−0.035 mA at −0.197 V) for the oxygen reduction reaction (ORR) than the other Cu-Ni(Fe)/G. The number of electrons transferred calculated in the ORR using Koutecky-Levich plots was 1.92, which indicated a two-electron pathway for producing H2 O2 . Compared with Cu1.0 /G, Ni1.0 /G and Fe1.0 /G, Cu0.5 Ni(Fe)0.5 /G had a lower onset potential, higher selectivity (%H2 O2 > 80%), which could be applied to further generate HO·. In conclusion, attributed to the alloy effect and the stronger synergistic effect between the G and the alloy NPs, the optimal Cu0.5 Ni0.5 /G catalyst with smallest size of alloy NPs and the best catalytic activities exhibited the efficient properties for further degradation of CAP.