Issue 18, 2018

Robust graphene-wrapped PtNi nanosponge for enhanced oxygen reduction reaction performance

Abstract

We synthesize a graphene-wrapped 3D-PtNi nanosponge (G-PtNi NS) using formic acid as a reducing agent and carbon dots as a structure-directing agent at room temperature. Reduced Ni and Pt atoms initiate the exfoliation of carbon dots into graphene dots, which eventually encapsulate the PtNi nanocrystals. The strong Pt–carbon interaction propels the formation of the G-PtNi NS with large specific surface area and good long-term stability. The G-PtNi NS shows high reactivity for an oxygen reduction reaction (ORR). The ORR activity is maintained even after 3000 cycles. We confirm that the graphene layers physically stabilize the PtNi NS and chemically adjust the oxygen affinity of the PtNi NS, which both positively contribute to the ORR performance.

Graphical abstract: Robust graphene-wrapped PtNi nanosponge for enhanced oxygen reduction reaction performance

Supplementary files

Article information

Article type
Communication
Submitted
26 2月 2018
Accepted
18 4月 2018
First published
19 4月 2018

J. Mater. Chem. A, 2018,6, 8259-8264

Robust graphene-wrapped PtNi nanosponge for enhanced oxygen reduction reaction performance

Q. C. Tran, H. An, H. Ha, V. T. Nguyen, N. D. Quang, H. Y. Kim and H. Choi, J. Mater. Chem. A, 2018, 6, 8259 DOI: 10.1039/C8TA01847B

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