Bimetallic Ag–Cu nanosheets assembled flower-like structure for oxygen reduction reaction

Chen，Jianan1; Wang，Zhenyu1,2; Mao，Jianjun1; Liu，Chang1; Chen，Yue1; Lu，Zhouguang2; Feng，Shien Ping1

2020

10.1016/j.jallcom.2020.157379

JOURNAL OF ALLOYS AND COMPOUNDS   影响因子和分区

0925-8388

Fabricating low-cost and Pt-free fuel cell catalysts towards highly active and durable oxygen-reduction reaction catalysis remains a great challenge. Herein, we synthesize a bimetallic Ag–Cu nanosheets assembled flower-like structure by our developed cyclic scanning electrodeposition (CSE) method. The formation mechanism of this structure is investigated systematically, where Cu can affect oxidative etching during the formation process. The prepared bimetallic nanostructure is studied for kinetics towards oxygen reduction reaction (ORR) in alkaline media. The electrochemical test results indicate that the ORR catalytic ability of bimetallic Ag–Cu nanostructure is competitive with Pt/C-20%, better than Pt disk, and far superior to the pure Ag nanostructure. The electrons transfer number (n) is close to four, which is further proved by scanning electrochemical microscope (SECM) experiments. Density functional theory (DFT) calculations reveal that the high ORR activity is attributable to the widely distributed Ag–Cu steps, which is formed by decorating Cu atoms on the Ag nanosheets.

Ag–Cu DFT Electrocatalyst Oxygen reduction reaction SECM

EI

英语

其他

20204209369139

Electrolytic reduction ; Design for testability ; Oxygen ; Reaction kinetics ; Density functional theory ; Etching ; Fuel cells ; Nanosheets

Ore Treatment:533.1 ; Fuel Cells:702.2 ; Nanotechnology:761 ; Chemical Reactions:802.2 ; Chemical Agents and Basic Industrial Chemicals:803 ; Chemical Products Generally:804 ; Probability Theory:922.1 ; Atomic and Molecular Physics:931.3 ; Quantum Theory; Quantum Mechanics:931.4 ; Solid State Physics:933

MATERIALS SCIENCE

2-s2.0-85092617373

Scopus

1.Department of Mechanical Engineering,The University of Hong Kong,Pokfulam,Pokfulam Rd.,999077,Hong Kong
2.Department of Materials Science and Engineering,Guangdong Provincial Key Laboratory of Energy Materials for Electric Power,Southern University of Science and Technology,Shenzhen,518055,China

Chen，Jianan,Wang，Zhenyu,Mao，Jianjun,等. Bimetallic Ag–Cu nanosheets assembled flower-like structure for oxygen reduction reaction[J]. JOURNAL OF ALLOYS AND COMPOUNDS,2020,856.

Chen，Jianan.,Wang，Zhenyu.,Mao，Jianjun.,Liu，Chang.,Chen，Yue.,...&Feng，Shien Ping.(2020).Bimetallic Ag–Cu nanosheets assembled flower-like structure for oxygen reduction reaction.JOURNAL OF ALLOYS AND COMPOUNDS,856.

Chen，Jianan,et al."Bimetallic Ag–Cu nanosheets assembled flower-like structure for oxygen reduction reaction".JOURNAL OF ALLOYS AND COMPOUNDS 856(2020).