Cerium tetraboride synthesized by a molten salt method and its Congo red adsorption performance

Wang, Chenyang; Li, Yangjuan; Shen, Rongfang; Liu, Xiyan

doi:10.1016/j.apt.2021.04.029

Cited by 7 publications

(6 citation statements)

References 41 publications

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“…As a simple and versatile route, molten salt synthesis allows for the synthesis of metal boride nanoparticles with controllable phases and morphologies. − Recently, a class of nanoscale transition metal diborides, including α-MoB 2 , have been synthesized through the metal oxide and boron reactions in the NaCl/KCl molten salt . However, the α-MoB 2 synthesized in molten salt exhibited a lower HER activity in acidic electrolyte than the α-MoB 2 nanoparticles prepared by the SSM method .…”

Section: Introductionmentioning

confidence: 99%

α-MoB₂ Nanosheets for Hydrogen Evolution in Alkaline and Acidic Media

Liu

Gong

2022

ACS Appl. Nano Mater.

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α-MoB2 is recognized as the most efficient molybdenum boride for electrocatalytic hydrogen evolution reaction (HER). However, the convenient synthesis of single phase α-MoB2 is still challenging, and its HER activity in alkaline electrolytes remains unclear. Herein, we report the first successful synthesis of the α-MoB2 nanosheets by a simple and facile molten salt method through the MoCl5 and NaBH4 reaction at 850 °C. The α-MoB2 nanosheets exhibit a remarkable HER performance in alkaline electrolytes, delivering a low overpotential of 124 mV at a current density of 10 mA/cm2. In acidic electrolytes, an improved performance was found in comparison to that of the bulk and nano α-MoB2 with an overpotential as low as 141 mV at 10 mA/cm2. Such HER performance arises from the nanosheet structure that allows more active planes to be exposed. In addition, the α-MoB2 nanosheets possess an outstanding stability in both acidic and alkaline media, showing negligible current density drop even after 3000 cycles and more than 24 h of potentiostatic operation.

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Section: Introductionmentioning

confidence: 99%

α-MoB₂ Nanosheets for Hydrogen Evolution in Alkaline and Acidic Media

Liu

Gong

2022

ACS Appl. Nano Mater.

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“…186 Instead of metal chloride, a metal floride was also occasionally used for MSM-ABRS of a metal boride. Wang et al synthesised approximately 50 nm CeB 4 particles in a LiCl-KCl eutectic salt at 750 °C for 3 h, using CeF 3 as the Ce source, 187 and Liu et al synthesised 15-30 nm CeB 6 particles at 900 °C for 4 h, using the same raw materials and salt. 188 In the former, the CeF 3 /NaHB 4 molar ratio (1:3.2) used was much lower than that (1:6 to 1:10) in the latter, demonstrating again the effect of metal/B ratio on the boride's stoichiometry, as mentioned above.…”

Section: Conventional and Molten Salt Mediated Alkaline Borohydride R...mentioning

confidence: 99%

“…[187][188][189] 50 nm CeB 4 and 15-30 nm CeB 6 particles formed via MSM-ABRS (Section 'Conventional and molten salt mediated alkaline borohydride reduction synthesis') showed remarkable performance in the removal of azo-dyes such as Congo red (CR), PS, and MO from their aqueous solutions. 187,188 For example, in the case of using CeB 4 for CR removal, the adsorption ratio reached 94.1-97.8% for solutions with initial concentrations of 100-500 mg L −1 , and the maximum removal capacity reached 491.8 mg g −1 . 187 And in the case of using CeB 6 , the maximum removal capacity reached as high as 775.6 mg g −1 .…”

Section: Waste-water Treatmentmentioning

confidence: 99%

“…187,188 For example, in the case of using CeB 4 for CR removal, the adsorption ratio reached 94.1–97.8% for solutions with initial concentrations of 100–500 mg L −1 , and the maximum removal capacity reached 491.8 mg g −1 . 187 And in the case of using CeB 6 , the maximum removal capacity reached as high as 775.6 mg g −1 . Such a good performance was attributed to its high adsorption ability, and additional high photocatalytic activity in the CR degradation.…”

Section: Preliminary Applications Of Molten Salt Synthesised Boride P...mentioning

confidence: 99%

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Low temperature controllable synthesis of transition metal and rare earth borides mediated by molten salt

Liu,

Jia,

Zhang

et al. 2024

International Materials Reviews

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Transition meal and rare earth borides have been subjected to extensive investigations because of their unique structures, superior properties and diverse applications. Conventional methods for their syntheses suffer from various drawbacks. So several alternative approaches have been explored. Among them, the so-called ‘molten salt synthesis (MSS)’ technique has proved promising. Over the past 10–15 years, it has been used to prepare a range of transition metal and rare earth borides. In this paper, the main results from these studies are reviewed. Initially, the relevant background on metal borides and their conventional synthesis methods are introduced, followed by the main principles/mechanisms of MSS. The following three sections provide an overview of the main work on MSS of binary and ternary borides, boride solid solutions, and boride-based composite powders. Then, two newly modified MSS approaches are presented. Finally, the main issues covered in this paper are summarised, and future prospects considered.

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“…It has been reported that molten salt synthesis is a simple and versatile route that favors the phase and size controllable preparation of metal boride nanoparticles. − This method has been used to prepare nanoscale electrocatalysts, including oxides and borides. − For β-MoB 2 , although it is intrinsically less active than α-MoB 2 as an electrocatalyst for the HER due to the presence of both flat graphene-like and puckered phosphorene-like B layers, it is possible to significantly improve its electrocatalytic performance via nanostructuring, which favors a larger surface area . Herein, single-crystalline phase β-MoB 2 nanosheets were synthesized for the first time via the reaction of MoCl 3 and B powders in molten LiCl-KCl for 4 h at 850 °C.…”

Section: Introductionmentioning

confidence: 99%

A Simple Molten Salt Route to Crystalline β-MoB₂ Nanosheets with High Activity for the Hydrogen Evolution Reaction

Liu

Gong

2021

Inorg. Chem.

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Molybdenum borides have been of interest due to their potential applications as electrocatalysts for the hydrogen evolution reaction (HER). As one of the common molybdenum borides, β-MoB 2 is deemed to exhibit low electrocatalytic activity due to the presence of puckered B layers, and improvement of its behavior is hindered by the lack of convenient synthetic methods. Herein, we report the synthesis of crystalline β-MoB 2 for the first time via the simple reaction of MoCl 3 and B at 850 °C in LiCl-KCl. The as-prepared β-MoB 2 sample was shown to exhibit a nanosheet structure with a large Brunauer−Emmett−Teller surface area of 48 m 2 /g. Such β-MoB 2 nanosheets exhibit promising HER activity in acidic medium with an overpotential of 187 mV at a current density of 10 mA/cm 2 and a Tafel slope of 49.3 mV/decade, which is much better than that of the known bulk β-MoB 2 and even close to the results of α-MoB 2 that is commonly recognized as the best molybdenum boride electrocatalyst for HER. The high HER activity of β-MoB 2 nanosheets results from the large surface area that allows more active sites to be exposed, which compensates for the disadvantage arising from the intrinsic structure of β-MoB 2 .

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Cerium tetraboride synthesized by a molten salt method and its Congo red adsorption performance

Cited by 7 publications

References 41 publications

α-MoB₂ Nanosheets for Hydrogen Evolution in Alkaline and Acidic Media

α-MoB₂ Nanosheets for Hydrogen Evolution in Alkaline and Acidic Media

Low temperature controllable synthesis of transition metal and rare earth borides mediated by molten salt

A Simple Molten Salt Route to Crystalline β-MoB₂ Nanosheets with High Activity for the Hydrogen Evolution Reaction

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Cerium tetraboride synthesized by a molten salt method and its Congo red adsorption performance

Cited by 7 publications

References 41 publications

α-MoB2 Nanosheets for Hydrogen Evolution in Alkaline and Acidic Media

α-MoB2 Nanosheets for Hydrogen Evolution in Alkaline and Acidic Media

Low temperature controllable synthesis of transition metal and rare earth borides mediated by molten salt

A Simple Molten Salt Route to Crystalline β-MoB2 Nanosheets with High Activity for the Hydrogen Evolution Reaction

Contact Info

Product

Resources

About

α-MoB₂ Nanosheets for Hydrogen Evolution in Alkaline and Acidic Media

α-MoB₂ Nanosheets for Hydrogen Evolution in Alkaline and Acidic Media

A Simple Molten Salt Route to Crystalline β-MoB₂ Nanosheets with High Activity for the Hydrogen Evolution Reaction