Jump to main content
Jump to site search

Issue 26, 2018
Previous Article Next Article

A general and scalable approach to produce nanoporous alloy nanowires with rugged ligaments for enhanced electrocatalysis

Author affiliations

Abstract

Nanoporous metal nanowires with large surface areas, and a high density of defect sites play an important role in catalysis. Here, a general and scalable one-step dealloying strategy is developed to prepare nanoporous alloy nanowires with controllable compositions by manipulating the grain size, structure and composition of bulk Cu-based precursor alloys. We prepared PtCuAu nanoporous nanowires with a diameter of 200–500 nm and tunable composition by dealloying a diluted Pt1Au0.5Cu98.5 single-phase alloy with nanoscale column-like-structured grains. Material characterization suggests that the formation of separated nanowires is due to the large-scale shrinkage of the column-structured grains during dealloying of Cu, which also generates ultrafine nanopores and rugged alloy ligaments with a high density of defect sites in the nanowires. When used as a cathodic catalyst for the oxygen reduction reaction (ORR), the PtCuAu nanoporous nanowires exhibit a composition-dependent catalytic performance. The 8.0 M HNO3 dealloyed sample exhibits a specific activity of 4.12 mA cm−2 at 0.9 V, which is more than 14 times that of commercial Pt/C. With the advantages of being easy to scale up, highly reproducible and controllable, the fabrication strategy holds great promise to prepare nanocatalysts for fuel cells.

Graphical abstract: A general and scalable approach to produce nanoporous alloy nanowires with rugged ligaments for enhanced electrocatalysis

Back to tab navigation

Supplementary files

Publication details

The article was received on 18 Apr 2018, accepted on 05 Jun 2018 and first published on 07 Jun 2018


Article type: Paper
DOI: 10.1039/C8TA03544J
Citation: J. Mater. Chem. A, 2018,6, 12541-12550
  •   Request permissions

    A general and scalable approach to produce nanoporous alloy nanowires with rugged ligaments for enhanced electrocatalysis

    H.-J. Qiu, J. J. Gao, F.-K. Chiang, Y. R. Wen, A. Y. Yao, P. Du, G. Fang, J. Q. Wang and X. J. Liu, J. Mater. Chem. A, 2018, 6, 12541
    DOI: 10.1039/C8TA03544J

Search articles by author

Spotlight

Advertisements