Nanoporous Pt−Co Alloy Nanowires: Fabrication, Characterization, and Electrocatalytic Properties

Abstract

Nanoporous Pt-Co alloy nanowires were synthesized by electrodeposition of Co-rich Pt(1)Co(99) alloy into anodic aluminum oxide (AAO) membranes, followed by a dealloying treatment in a mild acidic medium. These nanowires consist of porous skeletons with tiny pores of 1-5 nm and crystalline ligaments of 2-8 nm. Morphological and compositional evolutions of the porous Pt-Co nanowires upon dealloying were investigated, and their formation mechanism is discussed. The nanoporous Pt-Co alloy nanowires are found to exhibit distinctly enhanced electrocatalytic activities toward methanol oxidation as compared to the current state-of-the-art Pt/C and PtCo/C catalysts, thus showing substantial promise as efficient anode electrocatalysts in direct methanol fuel cells.

Synthesis and Applications of One-Dimensional Porous Nanowire Arrays: A Review

“…In the¯eld of electrocatalysis, Liu et al 30 well characterized the nanoporous Pt-Co alloy nanowires and found that this kind of as-dealloyed nanoporous Pt-Co alloy nanowires exhibited distinctly enhanced electrocatalytic activities toward methanol oxidation as compared to the current state-of-the-art Pt/C and Pt-Co/C catalysts, showing substantial promise as e±cient anode electrocatalysts in direct methanol fuel cells. Shui et al 45 claimed that the speci¯c activity of porous Pt-Fe alloy nanowire catalyst toward oxygen reduction reaction (ORR) is 0.383 mA cm showed only 9% loss of speci¯c activity and 4% loss of mass activity at 0.9 V after 13 500 cycles while the Pt/C showed a 24% loss of speci¯c activity and a 38% loss of mass activity.…”

“…[24][25][26][27][28][29] The extremely high surface-to-volume ratios contribute to large quantities of reactive interfaces, which make this kind of materials extremely sensitive to species adsorbed on the inner and outer surfaces, resulting in excellent sensitivity and selectivity. Meanwhile, 1D porous nanowires have shown desired functions in catalysis, [30][31][32][33][34][35][36] photocatalyst, 35,37 sensors, 36,[38][39][40] fuel cells, 41 Li-ion batteries, 37,[42][43][44][45][46][47] super-capacitors, 48,49 water treatment [50][51][52] and so forth. As far as the literature is concerned, there is no special review focusing on the typical 1D porous nanowires (arrays) referring to synthesis and applications till now.…”

Electrochemical Synthesis of Mesoporous Pt Nanowires with Highly Electrocatalytic Activity toward Methanol Oxidation Reaction

“…Among several morphologies of Pt catalysts, self-supported 1D architecture has the advantage of long-term stability [17][18][19][20]. It is generally known that Pt catalysts lose their activities through oxidation/dissolution process, especially for supported materials (e.g., carbon-supported Pt catalysts) [21,22].…”

Contact Behavior among Vertically Aligned Carbon Nanotube Bumps under Compression for Flexible Multilayer Substrates

“…To achieve multilayer assembly of flexible substrates, interlayer connections are required for electrical contact between each layer and mechanical robustness. Metal nanoporous structures like adhesive silver paste 1 or structures produced by de-alloying and extracting one component from an alloy [2][3][4][5][6][7] possess the properties of electrical contact and robustness against mechanical deformation.On the other hand, carbon nanotubes (CNTs) are a popular solution for flexible interconnects. CNTs are expected to be a substitutional wiring material for copper because of their high maximum allowable current density of 10 9 A/cm 2 estimated from ion beam irradiation.…”