MnCoOx-multi-walled carbon nanotubes composite with ultra-high specific capacitance for supercapacitors

Peng, Wenhao; Su, Zilong; Wang, Jiajun; Li, Shuji; Chen, Kaixuan; Song, Ningning; Luo, Shiping

doi:10.1016/j.est.2022.104519

Cited by 8 publications

(8 citation statements)

References 74 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The length of the discharge time in the same current density and potential range indicates the height of the specific capacitance value. Because the specific capacitance values obtained from the GCD curves are calculated according to the equation below [72–74]

$\vcenter{\openup.5em\halign{$\displaystyle{#}$\cr \ Cs={{{\rm I}.

…”

Section: Resultsmentioning

confidence: 99%

“…Because the specific capacitance values obtained from the GCD curves are calculated according to the equation below. [72][73][74] [76] Manohar et al found a specific capacitance value of 200 F/g at a current density of 1.1 A/g for Mg 2 + substituted MnFe 2 O 4 in 1 M KOH solution.. [77] Chaudhary et al determined the specific capacitance value of the nanocomposite consisting of ZnO and reduced graphene oxide in 3 M KOH solution as 365 F/g. [78] Liu et al stated that the specific capacitance value in 1 M NaOH solution for Fesubstituted SrCoO 3 perovskite reached 526 F/g at a current density of 1 A/g.…”

Section: Electrochemical Measurementmentioning

confidence: 99%

See 1 more Smart Citation

The Use of NiFe₂O₄ and CoFe₂O₄ Nanoparticles Produced by Green Synthesis as Electrode Material for Supercapacitors

Baytar,

Ekinci,

Şahin

et al. 2024

ChemistrySelect

View full text Add to dashboard Cite

In this report, for the first time, we have applied green synthesized NiFe2O4 and CoFe2O4 nanoparticles as electrode materials for supercapacitors (SCs). Bean pods extracts were used for the green synthesis of NiFe2O4 and CoFe2O4 nanoparticles. The structure and morphology of the samples were characterized by fourier transform infrared spectroscopy (FTIR), X‐ray diffraction (XRD), energy dispersive X‐ray (EDX), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). From XRD analysis, it was determined that NiFe2O4 and CoFe2O4 nanoparticles had a crystalline structure. EDX analysis confirms the presence of carbon and the stoichiometries of NiFe2O4 and CoFe2O4. In TEM analyses, it was determined that the sizes of nanoparticles varied in the range of 5–20 nm. The FTIR spectra supported the presence of Fe−O, Ni−O, and Co−O bonds. Electrochemical measurements of active materials were performed using cyclic voltammetry, galvanostatic charge‐discharge, and electrochemical impedance spectroscopy techniques in a 1 M H2SO4 solution. It was determined that the specific capacitance value of NiFe2O4 (129 F/g) was higher than that of CoFe2O4 (106 F/g). The cyclic stability of CoFe2O4 and NiFe2O4 was found to be 59 and 106 % retention at the end of 10000 cycles, respectively. The specific capacitance value and very good cyclic stability of NiFe2O4 showed that it is a good active substance that can be used in supercapacitor applications.

show abstract

$\vcenter{\openup.5em\halign{$\displaystyle{#}$\cr \ Cs={{{\rm I}.

…”

Section: Resultsmentioning

confidence: 99%

Section: Electrochemical Measurementmentioning

confidence: 99%

The Use of NiFe₂O₄ and CoFe₂O₄ Nanoparticles Produced by Green Synthesis as Electrode Material for Supercapacitors

Baytar,

Ekinci,

Şahin

et al. 2024

ChemistrySelect

View full text Add to dashboard Cite

show abstract

“…However, popular electrochemical sensors are limited to the use of noble metals such as Pt, Pd, Au, and Ag, which encourages researchers to develop low-cost alternatives while maintaining a remarkable electrocatalytic performance. , Recently, nonprecious transition-metal-based nanoarchitectures have emerged as effective chemically modified electrodes in nitrite sensing. Among them, spinel-structured metal oxides (AB 2 O 4 ) with differently coordinated multimetal cations have become a focal point of research due to the complex chemical composition, high stability of the structure, higher conductivity, mixed valency of the cations, synergistic effects, and rich surface chemistry. − Furthermore, a simple one-pot synthesis can prepare and scale these spinels in various combinations.…”

Section: Introductionmentioning

confidence: 99%

“…Mn 3+ occurs at 654.5 eV (2p 1/2 ) and 643.96 eV (2p 3/2 ), and Mn 2+ states are present at 653.53 eV (2p 1/2 ) and 641.84 eV (2p 3/2 ), with the Mn 2+ /Mn 3+ ratio of 1.24 indicating the high propensity of Mn 2+ . 26 Likewise, Co 2p exhibits a set of asymmetric twin peaks, which can be attributed to the spin− orbital splitting components of Co 2p 1/2 and Co 2p 3/2 at ∼795.5 and ∼780.4 eV, respectively, with a separation of 15.1 eV (Figure 5c). Each of these peaks can be divided into subpeaks arising from Co 2+ , Co 3+ , and satellite peaks.…”

mentioning

confidence: 98%

MnCo₂O₄ Spinel Nanorods for Highly Sensitive Electrochemical Detection of Nitrite

Ramesh,

Sahu,

Duvvuri

et al. 2024

Inorg. Chem.

View full text Add to dashboard Cite

The rational design of nitrite sensors has attracted significant research interest due to their widespread use and the associated risks of methemoglobinemia and carcinogenicity. The undisclosed nitrite-sensing performance of the spinel cobaltite MnCo2O4 (MCO) prepared by an oxalate-assisted coprecipitation method is reported in this study. Spectroscopy and microscopy investigations revealed the formation of uniform MCO nanorods with a high aspect ratio. The electrocatalytic nitrite oxidation at the MCO-coated glassy carbon electrode (MCO/GCE) indicated the promising performance of the synthesized material for nitrite sensing. MCO/GCE detects nitrite in a concentration range of 5 μM to 3 mM and has a limit of detection of 0.95 μM with a higher sensitivity of 857 μA mM–1 cm–2 in a response time of 4 s. In MCO, the mixed-valence states of Co2+/Co3+ confer a high electrical conductivity, and higher valent redox couples of Mn and Co impart remarkable electrocatalytic activity toward nitrite oxidation. MCO spinel undergoes facile and ultrafast faradaic reactions to mediate nitrite oxidation. Additionally, the mesopores of MCO nanorods facilitate the rapid diffusion of electrolyte and nitrite ions. Employing the electrode in sensing nitrite in milk, lake, and tap water samples further validates its potential application in real-life testing. MCO spinel nanorods showcase promising scope for utilization in the electrochemical sensing of nitrite and inspire further exploration of transition-metal oxide-based mixed-spinel materials.

show abstract

“…Composite electrode materials such as ZnMn 2 O 4 /MWCNTs, Mn 3 O 4 /MWCNTs, V 2 O 5 /CNT and MnCoO x /MWCNTs [23][24][25][26][27][28] have also been reported. Fabricating metal oxides with MWCNTs promotes a dual charge storage mechanism comprised of an electrochemical double layer capacitor (EDLC) mechanism from MWCNTs and the Faradaic redox reaction mechanism.…”

Section: Introductionmentioning

confidence: 99%

Pseudocapacitive Effects of Multi-Walled Carbon Nanotubes-Functionalised Spinel Copper Manganese Oxide

et al. 2022

View full text Add to dashboard Cite

Spinel copper manganese oxide nanoparticles combined with acid-treated multi-walled carbon nanotubes (CuMn2O4/MWCNTs) were used in the development of electrodes for pseudocapacitor applications. The CuMn2O4/MWCNTs preparation involved initial synthesis of Mn3O4 and CuMn2O4 precursors followed by an energy efficient reflux growth method for the CuMn2O4/MWCNTs. The CuMn2O4/MWCNTs in a three-electrode cell assembly and in 3 M LiOH aqueous electrolyte exhibited a specific capacitance of 1652.91 F g−1 at 0.5 A g−1 current load. Similar investigation in 3 M KOH aqueous electrolyte delivered a specific capacitance of 653.41 F g−1 at 0.5 A g−1 current load. Stability studies showed that after 6000 cycles, the CuMn2O4/MWCNTs electrode exhibited a higher capacitance retention (88%) in LiOH than in KOH (64%). The higher capacitance retention and cycling stability with a Coulombic efficiency of 99.6% observed in the LiOH is an indication of a better charge storage behaviour in this electrolyte than in the KOH electrolyte with a Coulombic efficiency of 97.3%. This superior performance in the LiOH electrolyte than in the KOH electrolyte is attributed to an intercalation/de-intercalation mechanism which occurs more easily in the LiOH electrolyte than in the KOH electrolyte.

show abstract

MnCoOx-multi-walled carbon nanotubes composite with ultra-high specific capacitance for supercapacitors

Cited by 8 publications

References 74 publications

The Use of NiFe₂O₄ and CoFe₂O₄ Nanoparticles Produced by Green Synthesis as Electrode Material for Supercapacitors

The Use of NiFe₂O₄ and CoFe₂O₄ Nanoparticles Produced by Green Synthesis as Electrode Material for Supercapacitors

MnCo₂O₄ Spinel Nanorods for Highly Sensitive Electrochemical Detection of Nitrite

Pseudocapacitive Effects of Multi-Walled Carbon Nanotubes-Functionalised Spinel Copper Manganese Oxide

Contact Info

Product

Resources

About

MnCoOx-multi-walled carbon nanotubes composite with ultra-high specific capacitance for supercapacitors

Cited by 8 publications

References 74 publications

The Use of NiFe2O4 and CoFe2O4 Nanoparticles Produced by Green Synthesis as Electrode Material for Supercapacitors

The Use of NiFe2O4 and CoFe2O4 Nanoparticles Produced by Green Synthesis as Electrode Material for Supercapacitors

MnCo2O4 Spinel Nanorods for Highly Sensitive Electrochemical Detection of Nitrite

Pseudocapacitive Effects of Multi-Walled Carbon Nanotubes-Functionalised Spinel Copper Manganese Oxide

Contact Info

Product

Resources

About

The Use of NiFe₂O₄ and CoFe₂O₄ Nanoparticles Produced by Green Synthesis as Electrode Material for Supercapacitors

The Use of NiFe₂O₄ and CoFe₂O₄ Nanoparticles Produced by Green Synthesis as Electrode Material for Supercapacitors

MnCo₂O₄ Spinel Nanorods for Highly Sensitive Electrochemical Detection of Nitrite