High yield synthesis of transition metal fluorides (CoF2, NiF2, and NH4MnF3) nanoparticles with excellent electrochemical performance

Khan, Jamshid; Ullah, Hameed; Sajjad, Muhammad; Bahadar, Ali; Bhatti, Zubeda; Soomro, Faheeda; Memon, Fida Hussain; Iqbal, Muzaffar; Rehman, Faisal; Thebo, Khalid Hussain

doi:10.1016/j.inoche.2021.108751

Cited by 31 publications

(13 citation statements)

References 31 publications

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“…Among many catalysts, noble metal-based catalysts (e.g., IrO 2 /RuO 2 for OER; Pt-based materials for HER) usually serve as the benchmarking electrocatalysts and exhibit desirable performance with low HER and OER overpotential in alkaline solution. , However, high cost and scarcity of these metal-based catalysts largely restrict their widespread applications. , To address these problems, the design and fabrication of earth-abundant, stable, and highly efficient electrocatalysts with compatible activity and low overpotentials are needed. − Thus, it is urgent to prepare the catalysts from earth-abundant transition metals with high-performance and low-price for bifunctional OER and HER …”

Section: Introductionmentioning

confidence: 99%

Morphology Modulation and Phase Transformation of Manganese–Cobalt Carbonate Hydroxide Caused by Fluoride Doping and Its Effect on Boosting the Overall Water Electrolysis

Shamloofard

Shahrokhian

2023

Inorg. Chem.

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Increasing demands for pollution-free energy resources have stimulated intense research on the design and fabrication of highly efficient, inexpensive, and stable non-noble earth-abundant metal catalysts with remarkable catalytic activity for the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER). Morphology control of the catalysts is widely implemented as an effective strategy to change the surface atomic coordination and increase the catalytic behavior of the catalysts. In this study, we have designed a series of Mn–Co catalyts with different morphologies on the graphite paper substrate to enhance OER and HER activities in alkaline media. The prepared catalysts with different morphologies were successfully obtained by adjusting the amount of ammonium fluoride (NH4F) in the hydrothermal process. The electrochemical tests display that the cubic-like Mn–Co catalyst with pyramids on the faces at a concentration of 0.21 M NH4F exhibits the best activity toward both OER and HER. The cubic-like Mn–Co catalyst with pyramids on the faces showed overpotentials of 240 and 82 mV at a current density of 10 mA cm–2 for OER and HER, respectively. Also, the cubic-like Mn–Co catalyst with pyramids on the faces required overpotentials of 319 and 216 mV to reach the current density of 100 mA cm–2 for OER and HER, respectively. The current density of this catalyst at η = 0.32 V was 701.05 mA cm–2 for OER, and for HER, the current density of the catalyst was 422.89 mA cm–2 at η = 0.23 V. The Tafel slopes of the Mn–Co catalyst with cubic-like structures with pyramids on the faces were 78 and 121 mV dec–1 for OER and HER, respectively. A two-electrode overall water electrolysis system using this bifunctional Mn–Co catalyst exhibited low cell voltages of 1.60 in the alkaline electrolyte at the standard current density of 10 mA cm–2 with appropriate stability. These electrochemical merits exhibit the considerable potential of the cubic-like Mn–Co catalyst with pyramids on the faces for bifunctional OER and HER applications.

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Section: Introductionmentioning

confidence: 99%

Morphology Modulation and Phase Transformation of Manganese–Cobalt Carbonate Hydroxide Caused by Fluoride Doping and Its Effect on Boosting the Overall Water Electrolysis

Shamloofard

Shahrokhian

2023

Inorg. Chem.

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“…The storage of lithium ions in the conversion reaction is achieved through a replacement redox reaction between Li + and transition metal cations. At present, conversion‐type materials have been widely studied, such as metal oxides, [23] sulfides, [24–26] selenides, [27,28] phosphides, [29,30] and fluorides [31,32] . Among them, metal fluorides have been less studied in lithium‐ion batteries, but they have shown excellent electrochemical performance in the available studies.…”

Section: Introductionmentioning

confidence: 99%

YF₃ with Nanostructure: A Rare Earth Metal Fluoride Anode for Lithium‐Ion Batteries

Jiao,

Duan,

et al. 2023

ChemistrySelect

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The emergence of Li‐ion batteries provides a new path and scheme for carbon neutrality and carbon peak. The performance of lithium‐ion batteries is mainly determined by the electrode material. Among them, transition metal compounds have been widely studied in the anode and cathode materials of lithium‐ion batteries. Here, pure rare earth metal fluoride YF3 was synthesized by solvothermal method and subsequent calcination. The specific capacity of YF3 as a Li‐ion battery anode can increase from 29.3 mAh g−1 to 148.5 mAh g−1 after 1000 cycles at 0.1 A g−1, with a growth rate of up to 407 %. XPS and XRD tests confirmed that the lithium storage process was a typical conversion reaction. The successful application of YF3 in Li‐ion batteries provides a wider range for the selection of Li‐ion electrode materials and also provides a new idea for the exploration of new materials for lithium‐ion batteries.

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“…Thermal grease is often used for thermal interface materials, but it is associated with the 'pump-out' problem; furthermore, the thickness constraint in phase change materials limits its use for heat dissipation applications. Recently, polymer-based thermally conductive composites are typically made by directly combining a polymer matrix with extremely thermally conductive fillers such as carbon black [13], graphene [14,15], boron niride [16], and alumina [17]; however, the random distribution of fillers in bulk composites typically results in high interfacial thermal resistance and limits the through-plane thermal conductivity in between 1-5 Wm −1 K −1 . Modification of filler is one of the probable ways to augment the distribution and interconnective networks among matrix and fillers, thus improving thermal attributes of the composites.…”

Section: Introductionmentioning

confidence: 99%

Silicone Elastomer Composites Fabricated with MgO and MgO-Multi-Wall Carbon Nanotubes with Improved Thermal Conductivity

et al. 2021

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The effect of multiwall carbon nanotubes (MWCNTs) and magnesium oxide (MgO) on the thermal conductivity of MWCNTs and MgO-reinforced silicone rubber was studied. The increment of thermal conductivity was found to be linear with respect to increased loading of MgO. In order to improve the thermal transportation of phonons 0.3 wt % and 0.5 wt % of MWCNTs were added as filler to MgO-reinforced silicone rubber. The MWCNTs were functionalized by hydrogen peroxide (H2O2) to activate organic groups onto the surface of MWCNTs. These functional groups improved the compatibility and adhesion and act as bridging agents between MWCNTs and silicone elastomer, resulting in the formation of active conductive pathways between MgO and MWCNTs in the silicone elastomer. The surface functionalization was confirmed with XRD and FTIR spectroscopy. Raman spectroscopy confirms the pristine structure of MWCNTs after oxidation with H2O2. The thermal conductivity is improved to 1 W/m·K with the addition of 20 vol% with 0.5 wt % of MWCNTs, which is an ~8-fold increment in comparison to neat elastomer. Improved thermal conductive properties of MgO-MWCNTs elastomer composite will be a potential replacement for conventional thermal interface materials.

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High yield synthesis of transition metal fluorides (CoF2, NiF2, and NH4MnF3) nanoparticles with excellent electrochemical performance

Cited by 31 publications

References 31 publications

Morphology Modulation and Phase Transformation of Manganese–Cobalt Carbonate Hydroxide Caused by Fluoride Doping and Its Effect on Boosting the Overall Water Electrolysis

Morphology Modulation and Phase Transformation of Manganese–Cobalt Carbonate Hydroxide Caused by Fluoride Doping and Its Effect on Boosting the Overall Water Electrolysis

YF₃ with Nanostructure: A Rare Earth Metal Fluoride Anode for Lithium‐Ion Batteries

Silicone Elastomer Composites Fabricated with MgO and MgO-Multi-Wall Carbon Nanotubes with Improved Thermal Conductivity

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High yield synthesis of transition metal fluorides (CoF2, NiF2, and NH4MnF3) nanoparticles with excellent electrochemical performance

Cited by 31 publications

References 31 publications

Morphology Modulation and Phase Transformation of Manganese–Cobalt Carbonate Hydroxide Caused by Fluoride Doping and Its Effect on Boosting the Overall Water Electrolysis

Morphology Modulation and Phase Transformation of Manganese–Cobalt Carbonate Hydroxide Caused by Fluoride Doping and Its Effect on Boosting the Overall Water Electrolysis

YF3 with Nanostructure: A Rare Earth Metal Fluoride Anode for Lithium‐Ion Batteries

Silicone Elastomer Composites Fabricated with MgO and MgO-Multi-Wall Carbon Nanotubes with Improved Thermal Conductivity

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Product

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YF₃ with Nanostructure: A Rare Earth Metal Fluoride Anode for Lithium‐Ion Batteries