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Nitrogen-doped, FeNi alloy nanoparticle-decorated graphene as an efficient and stable electrode for electrochemical supercapacitors in acid medium.

El-Deen AG, El-Newehy M, Kim CS, Barakat NA - Nanoscale Res Lett (2015)

Bottom Line: Nitrogen-doped graphene decorated by iron-nickel alloy is introduced as a promising electrode material for supercapacitors.Compared to pristine and Ni-decorated graphene, in acid media, the introduced electrode revealed excellent specific capacitance as the corresponding specific capacitance was multiplied around ten times with capacity retention maintained at 94.9% for 1,000 cycles.The introduced N-doped FeNi@Gr exhibits remarkable electrochemical behavior with long-term stability.

View Article: PubMed Central - PubMed

Affiliation: Bionanosystem Engineering Department, Chonbuk National University, Jeonju, 561-756 Republic of Korea.

ABSTRACT
Nitrogen-doped graphene decorated by iron-nickel alloy is introduced as a promising electrode material for supercapacitors. Compared to pristine and Ni-decorated graphene, in acid media, the introduced electrode revealed excellent specific capacitance as the corresponding specific capacitance was multiplied around ten times with capacity retention maintained at 94.9% for 1,000 cycles. Briefly, iron acetate, nickel acetate, urea, and graphene oxide were ultrasonicated and subjected to MW heating and then sintered with melanin in Ar. The introduced N-doped FeNi@Gr exhibits remarkable electrochemical behavior with long-term stability.

No MeSH data available.


XRD pattern, XPS spectra, FE-SEM image, and EDX. XRD pattern (a), XPS spectra (b), FE-SEM image (c), and the corresponding EDX (d) for the N-doped FeNi@Gr after the calcination process.
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Fig1: XRD pattern, XPS spectra, FE-SEM image, and EDX. XRD pattern (a), XPS spectra (b), FE-SEM image (c), and the corresponding EDX (d) for the N-doped FeNi@Gr after the calcination process.

Mentions: Figure 1a displays the XRD spectra of the anchoring FeNi alloy nanoparticles (NPs) on graphene sheets after the calcination process. The broad diffraction peak observed at 2θ = 22.2° to 26.8° indicates the disordered stacking of graphene sheets; however, three distinctive diffraction peaks at 2θ values of 43.8°, 51.1°, and 75.6° corresponding to (111), (200), and (220) crystal planes, respectively, indicate the formation of FeNi alloy [34]. XPS spectra presented in Figure 1b confirm the successful doping with nitrogen contents up to 10.1%. Furthermore, the inset showing the high-resolution N1s spectra reveals the presence of nitrogen atoms with three different binding energies, indicating that there are at least three typical nitrogen states: pyridinic (ca. 398 eV), amino (ca. 399.05 eV), and pyrrolic (ca. 399.63 eV) [35]. Figure 1c shows FE-SEM images of the synthesized modified graphene. As shown in the figure, the intercalated FeNi NPs into graphene have a small size and a very good uniform distribution on the graphene sheets. Moreover, the EDX pattern in Figure 1d elucidates the presence of C, Fe, and Ni elements in the investigated area. Figure 2a describes the TEM image of the ultrathin wrinkled graphene few layers. As shown in the inset, the average diameter of the metallic NPs distributed on graphene sheets is approximately 15 nm. The HRTEM image (Figure 2b) indicates that the bimetallic NPs have good crystallinity. Moreover, as shown in the elemental mapping results (Figure 2c,d,e), Fe and Ni have the same distribution that verifies the aforementioned hypothesis about formation of FeNi alloy NPs attached with graphene nanosheets.Figure 1


Nitrogen-doped, FeNi alloy nanoparticle-decorated graphene as an efficient and stable electrode for electrochemical supercapacitors in acid medium.

El-Deen AG, El-Newehy M, Kim CS, Barakat NA - Nanoscale Res Lett (2015)

XRD pattern, XPS spectra, FE-SEM image, and EDX. XRD pattern (a), XPS spectra (b), FE-SEM image (c), and the corresponding EDX (d) for the N-doped FeNi@Gr after the calcination process.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
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getmorefigures.php?uid=PMC4385200&req=5

Fig1: XRD pattern, XPS spectra, FE-SEM image, and EDX. XRD pattern (a), XPS spectra (b), FE-SEM image (c), and the corresponding EDX (d) for the N-doped FeNi@Gr after the calcination process.
Mentions: Figure 1a displays the XRD spectra of the anchoring FeNi alloy nanoparticles (NPs) on graphene sheets after the calcination process. The broad diffraction peak observed at 2θ = 22.2° to 26.8° indicates the disordered stacking of graphene sheets; however, three distinctive diffraction peaks at 2θ values of 43.8°, 51.1°, and 75.6° corresponding to (111), (200), and (220) crystal planes, respectively, indicate the formation of FeNi alloy [34]. XPS spectra presented in Figure 1b confirm the successful doping with nitrogen contents up to 10.1%. Furthermore, the inset showing the high-resolution N1s spectra reveals the presence of nitrogen atoms with three different binding energies, indicating that there are at least three typical nitrogen states: pyridinic (ca. 398 eV), amino (ca. 399.05 eV), and pyrrolic (ca. 399.63 eV) [35]. Figure 1c shows FE-SEM images of the synthesized modified graphene. As shown in the figure, the intercalated FeNi NPs into graphene have a small size and a very good uniform distribution on the graphene sheets. Moreover, the EDX pattern in Figure 1d elucidates the presence of C, Fe, and Ni elements in the investigated area. Figure 2a describes the TEM image of the ultrathin wrinkled graphene few layers. As shown in the inset, the average diameter of the metallic NPs distributed on graphene sheets is approximately 15 nm. The HRTEM image (Figure 2b) indicates that the bimetallic NPs have good crystallinity. Moreover, as shown in the elemental mapping results (Figure 2c,d,e), Fe and Ni have the same distribution that verifies the aforementioned hypothesis about formation of FeNi alloy NPs attached with graphene nanosheets.Figure 1

Bottom Line: Nitrogen-doped graphene decorated by iron-nickel alloy is introduced as a promising electrode material for supercapacitors.Compared to pristine and Ni-decorated graphene, in acid media, the introduced electrode revealed excellent specific capacitance as the corresponding specific capacitance was multiplied around ten times with capacity retention maintained at 94.9% for 1,000 cycles.The introduced N-doped FeNi@Gr exhibits remarkable electrochemical behavior with long-term stability.

View Article: PubMed Central - PubMed

Affiliation: Bionanosystem Engineering Department, Chonbuk National University, Jeonju, 561-756 Republic of Korea.

ABSTRACT
Nitrogen-doped graphene decorated by iron-nickel alloy is introduced as a promising electrode material for supercapacitors. Compared to pristine and Ni-decorated graphene, in acid media, the introduced electrode revealed excellent specific capacitance as the corresponding specific capacitance was multiplied around ten times with capacity retention maintained at 94.9% for 1,000 cycles. Briefly, iron acetate, nickel acetate, urea, and graphene oxide were ultrasonicated and subjected to MW heating and then sintered with melanin in Ar. The introduced N-doped FeNi@Gr exhibits remarkable electrochemical behavior with long-term stability.

No MeSH data available.