1D Pd-Based Nanomaterials as Efficient Electrocatalysts for Fuel Cells - Low-cost Nanomaterials: Toward Greener and More Efficient Energy Applications - page 334

Fig. 16 TEM (a, b) and HRTEM (c) images of the obtained Pd 80 Pt 20 nanowires. HAADF-
STEM-EDS mapping images (d-g)ofPd 80 Pt 20 nanowires. The cross-sectional compositional line
profiles of individual Pd 80 Pt 20 nanowire (h). e Pd-K; f Pt-L; g Pd-K + Pt-L. Reprinted from
Ref. [ 64 ] with permission by Wiley-VCH

PdPt ANWs exhibit significantly enhanced activity and stability toward ethanol
oxidation in alkaline medium. Figure 16 a and b show the TEM images of the
Pd 80 Pt 20 ANWs templated from pre-synthesized Te NWs under different magni-
fications, clearly indicating the formation of uniform nanowires with high aspect
ratios, an average diameter of 10.8 nm, and lengths up to tens of micrometers.
HRTEM and elemental mapping measurements (Fig. 16 c-h) revealed that both Pd
and Pt elements are homogeneously distributed without significant segregation of
each component. Electrochemical experiments are then performed to evaluate the
catalytic activity of the PdPt ANWs toward alcohol oxidation. As shown in
Fig. 17 a, for the PdPt ANWs with different compositions, the Pd 45 Pt 55 ANWs
displays the highest activity toward ethanol oxidation in terms of onset potential
and peak current. Based on the CV comparison in Fig. 17 b, the mass activities on
the Pd 45 Pt 55 ANWs modified electrode is about 1.2 and 1.8 times of those on the
Pd NWs and Pt nanotubes electrodes for ethanol oxidation. Moreover, the Pd 45 Pt 55
ANWs also show a higher activity than commercial Pd/C electrocatalyst for eth-
anol oxidation. From the current-time curves recorded at -0.2 V shown in
Fig. 17 c, the Pd 45 Pt 55 ANWs exhibit the highest catalytic stability among the
studied electrocatalysts. On the other hand, the as-prepared 1D Pd 45 Pt 55 catalyst
also

shows higher electrocatalytic activity and stability compared to the