Limits...
Influence of copper content on the electrocatalytic activity toward methanol oxidation of Co(χ)Cu(y) alloy nanoparticles-decorated CNFs.

Ghouri ZK, Barakat NA, Kim HY - Sci Rep (2015)

Bottom Line: The introduced electrocatalyst has been synthesized by simple and effective process; electrospinning.The nanofibrous morphology and alloy structure have been confirmed by SEM, TEM and XRD analyses.Overall, the introduced study revealed the veil about the distinct role of copper in enhancing the electrocatalytic activity of cobalt-based materials.

View Article: PubMed Central - PubMed

Affiliation: Advanced Materials Institute for BIN Convergence, Department of BIN Convergence Technology, Chonbuk National University, Jeonju 561-756, Republic of Korea.

ABSTRACT
In this study, CoCu alloy nanoparticles-incorporated carbon nanofibers are introduced as effective non precious electrocatalyst for methanol oxidation in alkaline medium. The introduced electrocatalyst has been synthesized by simple and effective process; electrospinning. Typically, calcination, in nitrogen atmosphere, of electrospun nanofibers composed of cobalt acetate, copper acetate and poly (vinyl alcohol) leads to form carbon nanofibers decorated by CoCu nanoparticles. The nanofibrous morphology and alloy structure have been confirmed by SEM, TEM and XRD analyses. Investigation of the electrocatalytic activity indicates that copper content has strong influence, the alloy nanoparticles having the composition Cu5%Co95% showed distinct high performance; 100 times higher than other formulations. Overall, the introduced study revealed the veil about the distinct role of copper in enhancing the electrocatalytic activity of cobalt-based materials.

No MeSH data available.


Related in: MedlinePlus

(A,B) TEM images (C) HRTEM image (D) SEAD image and (E) Line TEM EDX analysis of produced Cu5%Co95%-CNFs after calcination of produced nanofibers.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC4645225&req=5

f3: (A,B) TEM images (C) HRTEM image (D) SEAD image and (E) Line TEM EDX analysis of produced Cu5%Co95%-CNFs after calcination of produced nanofibers.

Mentions: To examine the hypothesis of formation of bimetallic nanoparticles decorating carbon nanofibers; TEM analysis was carried. Figure 3(A,B) displays TEM images of the obtained sintered nanofibers from the electrospun mats containing 0.05 g CuAC (Cu5%Co95% − CNFs). As shown, the nanofibers are ornamented by crystalline metallic nanoparticles distributed along with nanofibers which also supports the FESEM image (Fig. 1(B–D). Figure 3(C) displaying HR TEM image shows that the attached nanoparticles have good crystallinity (red arrow) which indicates that these nanoparticles compose of Co and/or Cu. Moreover the main nanofiber has an amorphous structure which refers to carbon. The selected area electron diffraction pattern (SEAD) demonstrated in panel D indicated good crystallinity for the metallic nanoparticles and simultaneously supports the XRD results.


Influence of copper content on the electrocatalytic activity toward methanol oxidation of Co(χ)Cu(y) alloy nanoparticles-decorated CNFs.

Ghouri ZK, Barakat NA, Kim HY - Sci Rep (2015)

(A,B) TEM images (C) HRTEM image (D) SEAD image and (E) Line TEM EDX analysis of produced Cu5%Co95%-CNFs after calcination of produced nanofibers.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4645225&req=5

f3: (A,B) TEM images (C) HRTEM image (D) SEAD image and (E) Line TEM EDX analysis of produced Cu5%Co95%-CNFs after calcination of produced nanofibers.
Mentions: To examine the hypothesis of formation of bimetallic nanoparticles decorating carbon nanofibers; TEM analysis was carried. Figure 3(A,B) displays TEM images of the obtained sintered nanofibers from the electrospun mats containing 0.05 g CuAC (Cu5%Co95% − CNFs). As shown, the nanofibers are ornamented by crystalline metallic nanoparticles distributed along with nanofibers which also supports the FESEM image (Fig. 1(B–D). Figure 3(C) displaying HR TEM image shows that the attached nanoparticles have good crystallinity (red arrow) which indicates that these nanoparticles compose of Co and/or Cu. Moreover the main nanofiber has an amorphous structure which refers to carbon. The selected area electron diffraction pattern (SEAD) demonstrated in panel D indicated good crystallinity for the metallic nanoparticles and simultaneously supports the XRD results.

Bottom Line: The introduced electrocatalyst has been synthesized by simple and effective process; electrospinning.The nanofibrous morphology and alloy structure have been confirmed by SEM, TEM and XRD analyses.Overall, the introduced study revealed the veil about the distinct role of copper in enhancing the electrocatalytic activity of cobalt-based materials.

View Article: PubMed Central - PubMed

Affiliation: Advanced Materials Institute for BIN Convergence, Department of BIN Convergence Technology, Chonbuk National University, Jeonju 561-756, Republic of Korea.

ABSTRACT
In this study, CoCu alloy nanoparticles-incorporated carbon nanofibers are introduced as effective non precious electrocatalyst for methanol oxidation in alkaline medium. The introduced electrocatalyst has been synthesized by simple and effective process; electrospinning. Typically, calcination, in nitrogen atmosphere, of electrospun nanofibers composed of cobalt acetate, copper acetate and poly (vinyl alcohol) leads to form carbon nanofibers decorated by CoCu nanoparticles. The nanofibrous morphology and alloy structure have been confirmed by SEM, TEM and XRD analyses. Investigation of the electrocatalytic activity indicates that copper content has strong influence, the alloy nanoparticles having the composition Cu5%Co95% showed distinct high performance; 100 times higher than other formulations. Overall, the introduced study revealed the veil about the distinct role of copper in enhancing the electrocatalytic activity of cobalt-based materials.

No MeSH data available.


Related in: MedlinePlus