Chemical bath synthesis of NiCo2O4 nanoflowers with nanorods like thin film for flexible supercapacitor application-effect of urea concentration on structural conversion

Waghmode, R.B.; Maile, Nagesh; Lee, D.S.; Torane, A. P.

doi:10.1016/j.electacta.2020.136413

Cited by 43 publications

(19 citation statements)

References 42 publications

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“…MnCo(OH) X due to van der Waals or electrostatic force gets adsorbed at the FTO substrate to form the MnCo(OH) X thin film. The hydroxides in MnCo(OH) X decomposed upon calcination to form cuboidal MnCo 2 O 4 . , …”

Section: Methodsmentioning

confidence: 99%

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In Situ Grown Cuboidal MnCo₂O₄/h Boron Nitride Heterojunction: A Noble Metal-Free Approach Based on Efficient Hole Extraction for Electrochemical Oxygen Evolution Reaction

Shah

Qureshi

2022

ACS Appl. Energy Mater.

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Rational design of complex spinel oxides directly onto the substrate as a highly stable electrocatalytic anode material for oxygen evolution reaction (OER) is a crucial step to replace a noble metal-based electrocatalyst. Herein, surfactant-free cuboidal MnCo2O4 (C-MCO) was synthesized in situ over FTO by a green and simple synthetic protocol. Stable and good ohmic contact between C-MCO and the substrate ensures efficient transfer of the charge carrier at their interface. Hexagonal boron nitride (h-BN) nanosheets coupled with C-MCO provides a surface for easy deposition of the co-catalyst, making active sites easily available and accessible for enhanced OER activity. The surface-modified C-MCO/h-BN electrode shows a Tafel slope value of 66 mV/dec with an overpotential of 240 mV at a current density of 10 mA/cm2. C-MCO/h-BN displays ∼2.8-fold enhancement in turnover frequency compared to its pristine counterpart, with a faradaic yield of 97%. This study can be used for large-scale clean energy production owing to its low-cost, efficient, eco-friendly, and long-term stability of the C-MCO/h-BN electrocatalyst.

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Section: Methodsmentioning

confidence: 99%

“…The hydroxides in MnCo(OH) X decomposed upon calcination to form cuboidal MnCo 2 O 4 . 20,21 Materials Characterization. A Rigaku Smartlab X-ray diffractometer with Cu K α (λ = 1.5405 Å) and 9 kW power output was used to carry out X-ray diffraction measurements.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

In Situ Grown Cuboidal MnCo₂O₄/h Boron Nitride Heterojunction: A Noble Metal-Free Approach Based on Efficient Hole Extraction for Electrochemical Oxygen Evolution Reaction

Shah

Qureshi

2022

ACS Appl. Energy Mater.

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“…An electrode fabricated using the NiCo 2 O 4 thin film synthesized using an optimized urea concentration (2 M) exhibited a specific capacitance of 702 F g −1 . Additionally, the fabricated flexible solid-state SC device exhibited a specific capacitance of 132 F g −1 and an energy density of 18.52 W h kg −1 at a power density of 3.13 kW kg −1 [ 157 ]. Anitha et al used CBD to prepare a binder-free PbMoO 4 /CdMoO 4 -based composite electrode material on Ni foam and evaluated the electrode’s electrochemical performance.…”

Section: Chemical-bath Depositionmentioning

confidence: 99%

Critical Aspects of Various Techniques for Synthesizing Metal Oxides and Fabricating Their Composite-Based Supercapacitor Electrodes: A Review

et al. 2022

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Supercapacitors (SCs) have attracted attention as an important energy source for various applications owing to their high power outputs and outstanding energy densities. The electrochemical performance of an SC device is predominantly determined by electrode materials, and thus, the selection and synthesis of the materials are crucial. Metal oxides (MOs) and their composites are the most widely used pseudocapacitive SC electrode materials. The basic requirements for fabricating high-performance SC electrodes include synthesizing and/or chemically modifying unique conducting nanostructures, optimizing a heterostructure morphology, and generating large-surface-area electroactive sites, all of which predominantly rely on various techniques used for synthesizing MO materials and fabricating MO- and MO-composite-based SC electrodes. Therefore, an SC’s background and critical aspects, the challenges associated with the predominant synthesis techniques (including hydrothermal and microwave-assisted syntheses and chemical-bath and atomic-layer depositions), and resulting electrode electrochemical performances should be summarized in a convenient, accessible report to accelerate the development of materials for industrial SC applications. Therefore, we reviewed the most pertinent studies on these synthesis techniques to provide insight into the most recent advances in synthesizing MOs and fabricating their composite-based SC electrodes as well as to propose research directions for developing MO-based electrodes for applications to next-generation SCs.

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“…7,8 In the operations of SCs, one of the critical components is the electrode material as it drives the performance and energy of SCs. 9 Electrode materials can be classified into three main categories which include carbonaceous materials, transition metal oxides, and conducting polymers. Transition metal oxides (TMOs) consisting of NiO, RuO 2 , Co 3 O 4 , V 2 O 5 , etc.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, in electrodeposition, factors such as the composition of the electrolyte, type of electrodeposition mode, and duration of the process can be regulated to achieve the desired morphology and texture, including nanoplates, nanoflowers, nanosheets, and nanotubes. 9,28,29,33,34 Subsequently, previous studies have reported a variation in morphological features, microstructure, and corresponding electrochemical performance of Co 3 O 4 materials when different types of cobalt precursor salts, namely, cobalt chloride, cobalt acetate, cobalt sulfate, and cobalt nitrate, are used. 26,35,36 The growth rate of Co 3 O 4 was observed to be higher when chloride was used as compared to acetate.…”

Section: Introductionmentioning

confidence: 99%

Effect of Molar Ratio Modulation of Cobalt Precursors on Supercapacitor Behavior of Engineered Co–Co₃O₄ Nanocomposite Electrodes

Nuamah

Noormohammed

Sarkar

2022

ACS Appl. Eng. Mater.

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Nanostructured Co−Co 3 O 4 composite thin films deposited on nickel foam (NF) using combined cyclic voltammetry (CV) and pulse reverse potential (CV PRP) modes of electrodeposition from an electrolyte composed of CoCl 2 and Co(CH 3 COO) 2 precursor salt solutions with varied molar ratios demonstrated a dependency of the supercapacitance performance over the precursor components' molar ratios. The specific capacity and its retention were found to increase with increasing CoCl 2 in the electrolyte with a starting value of 474.6 C/g (791 F/g) at an applied current load of 1 A/g for a molar ratio of Co(CH 3 COO) 2 :CoCl 2 of 100:0. High specific capacity of 1548 C/g (2580 F/g) and large retention (90.5%) were obtained at a critical molar ratio of Co(CH 3 COO) 2 :CoCl 2 of 20:80. However, with 100% CoCl 2 in the electrolyte, the specific capacity lowered to 276 C/g (460 F/g) with poor retention of only 60%. Crystallinity and morphological features, driven by the electrolyte concentration with molar variations of the deposited films, have been found to influence the specific capacitance performance. The degree of crystallinity, and the presence of Co and Co 3 O 4 phases for the different molar ratios have been revealed by X-ray diffraction (XRD) studies. The diverse morphological features obtained by scanning electron microscopy (SEM) and the varying quantities of Co and O in the Co−Co 3 O 4 nanocomposite thin films as confirmed by energy-dispersive X-ray spectroscopy (EDX) spectra correlate well with the electrochemical performance. The phase composition was further confirmed by the presence of Co−O bonds via the attenuated total reflection−Fourier transform infrared (ATR-FTIR) spectra obtained on these films.

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Chemical bath synthesis of NiCo2O4 nanoflowers with nanorods like thin film for flexible supercapacitor application-effect of urea concentration on structural conversion

Cited by 43 publications

References 42 publications

In Situ Grown Cuboidal MnCo₂O₄/h Boron Nitride Heterojunction: A Noble Metal-Free Approach Based on Efficient Hole Extraction for Electrochemical Oxygen Evolution Reaction

In Situ Grown Cuboidal MnCo₂O₄/h Boron Nitride Heterojunction: A Noble Metal-Free Approach Based on Efficient Hole Extraction for Electrochemical Oxygen Evolution Reaction

Critical Aspects of Various Techniques for Synthesizing Metal Oxides and Fabricating Their Composite-Based Supercapacitor Electrodes: A Review

Effect of Molar Ratio Modulation of Cobalt Precursors on Supercapacitor Behavior of Engineered Co–Co₃O₄ Nanocomposite Electrodes

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Chemical bath synthesis of NiCo2O4 nanoflowers with nanorods like thin film for flexible supercapacitor application-effect of urea concentration on structural conversion

Cited by 43 publications

References 42 publications

In Situ Grown Cuboidal MnCo2O4/h Boron Nitride Heterojunction: A Noble Metal-Free Approach Based on Efficient Hole Extraction for Electrochemical Oxygen Evolution Reaction

In Situ Grown Cuboidal MnCo2O4/h Boron Nitride Heterojunction: A Noble Metal-Free Approach Based on Efficient Hole Extraction for Electrochemical Oxygen Evolution Reaction

Critical Aspects of Various Techniques for Synthesizing Metal Oxides and Fabricating Their Composite-Based Supercapacitor Electrodes: A Review

Effect of Molar Ratio Modulation of Cobalt Precursors on Supercapacitor Behavior of Engineered Co–Co3O4 Nanocomposite Electrodes

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In Situ Grown Cuboidal MnCo₂O₄/h Boron Nitride Heterojunction: A Noble Metal-Free Approach Based on Efficient Hole Extraction for Electrochemical Oxygen Evolution Reaction

In Situ Grown Cuboidal MnCo₂O₄/h Boron Nitride Heterojunction: A Noble Metal-Free Approach Based on Efficient Hole Extraction for Electrochemical Oxygen Evolution Reaction

Effect of Molar Ratio Modulation of Cobalt Precursors on Supercapacitor Behavior of Engineered Co–Co₃O₄ Nanocomposite Electrodes