Iron, cobalt and nickel boride as precursor of heterogeneous oxazaborolidine catalysts

Molvinger, Karine; Lopez, Monique; Court, J.; Chavant, Pierre Y.

doi:10.1016/s0926-860x(01)00998-x

Cited by 12 publications

(16 citation statements)

References 21 publications

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“…The nature of the coordinating organic solvent has a direct influence on the reactivity of borohydride and product composition. For instance, reduction of the transition metal M(II) is much faster in tetrahydrofuran (THF) than in diglyme because the lifetime of the M(BH 4 ) 2 (THF) n is much shorter than that of M(BH 4 ) 2 (diglyme) n . Notably, Molvinger et al have synthesized transition‐metal‐rich boride complexes (CoB 2 , NiB 2 , FeB 1.8 ) by using M(II) and BH 4 − in THF at room temperature or under reflux conditions, which paves the way to prepare MB x with x > 1, and possibly investigate the relationship between alloy composition and catalytic activity …”

Section: Introductionmentioning

confidence: 99%

Retracted: Earth‐Abundant Iron Diboride (FeB₂) Nanoparticles as Highly Active Bifunctional Electrocatalysts for Overall Water Splitting

Wen

et al. 2017

Advanced Energy Materials

355

227

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energy conversion and storage. [1,2] Developing efficient electrocatalysts that can effectively enhance the sluggish kinetic processes are particularly important to the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER) at low overpotentials. [3,4] Platinum group metals and noble metal oxides (e.g., IrO 2 , RuO 2 ) are considered as pioneering HER and OER catalysts, respectively. However, the large-scale applications are limited by the scarcity and high cost of these materials. [5,6] Recently, a great deal of effort and progress has been made toward the development of earth-abundant, highly efficient, and durable HER and OER catalysts, such as transition metal chalcogenides, [7][8][9] phosphides, [10][11][12] nitrides, [13][14][15] and carbides [16][17][18] (for HER), and transition metal oxide, [19][20][21] hydroxide/oxyhydroxide, [22][23][24] phosphate, [25][26][27] and carbon materials [28][29][30] (for OER). Due to the thermodynamic convenience and practical application in proton-exchange membrane or alkaline electrolyzers, these HER and OER catalysts generally exhibit high activity in strongly acidic and basic conditions, separately; thus pairing the two type catalysts in an integrated electrolyzer with high efficiency and stability for overall water splitting is difficult due to the mismatch of electrolyte pH. [31,32] There is Developing efficient, durable, and earth-abundant electrocatalysts for both hydrogen and oxygen evolution reactions is important for realizing largescale water splitting. The authors report that FeB 2 nanoparticles, prepared by a facile chemical reduction of Fe 2+ using LiBH 4 in an organic solvent, are a superb bifunctional electrocatalyst for overall water splitting. The FeB 2 electrode delivers a current density of 10 mA cm −2 at overpotentials of 61 mV for hydrogen evolution reaction (HER) and 296 mV for oxygen evolution reaction (OER) in alkaline electrolyte with Tafel slopes of 87.5 and 52.4 mV dec −1 , respectively. The electrode can sustain the HER at an overpotential of 100 mV for 24 h and OER for 1000 cyclic voltammetry cycles with negligible degradation. Density function theory calculations demonstrate that the boron-rich surface possesses appropriate binding energy for chemisorption and desorption of hydrogen-containing intermediates, thus favoring the HER process. The excellent OER activity of FeB 2 is ascribed to the formation of a FeOOH/ FeB 2 heterojunction during water oxidation. An alkaline electrolyzer is constructed using two identical FeB 2 -NF electrodes as both anode and cathode, which can achieve a current density of 10 mA cm −2 at 1.57 V for overall water splitting with a faradaic efficiency of nearly 100%, rivalling the integrated state-of-the-art Pt/C and RuO 2 /C.

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Section: Introductionmentioning

confidence: 99%

Retracted: Earth‐Abundant Iron Diboride (FeB₂) Nanoparticles as Highly Active Bifunctional Electrocatalysts for Overall Water Splitting

Wen

et al. 2017

Advanced Energy Materials

355

227

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“…Prior to analysis, the samples were degassed at 373 K for 2.0 h. The nickel surface area was determined by the hydrodesulfurization of 3-methylthiophene in the liquid phase. [27][28][29] Experimental Setup. The sulfolene hydrogenation experiments were performed in a 100-mL high-pressure stainless autoclave.…”

Section: Methodsmentioning

confidence: 99%

Sulfolene Hydrogenation over an Amorphous Ni−B Alloy Catalyst on MgO

Zhang

et al. 2006

Ind. Eng. Chem. Res.

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The catalytic hydrogenations of sulfolene to sulfolane over different supported amorphous Ni-B alloy catalysts and Raney nickel catalysts were performed in a batch reactor under pressurized conditions. The deposition of amorphous Ni-B particles (average Ni-B particle size ) 40.5 nm) on MgO was carried out by a silvercatalyzed electroless plating technique. The influence of significant variables, such as the plating temperature and content of potassium borohydride, was investigated in the preparation. The silver and Ni-B loadings in the catalyst were varied as well. The catalysts were characterized by X-ray powder diffraction (XRD), inductively coupled plasma (ICP) spectrometry, high-resolution transmission electron microscopy (HRTEM), scanning electron microscopy (SEM), and N 2 physisorption. The load of nickel on MgO increases with the plating temperature, use of potassium borohydride, and loading of silver. The best Ni-B/MgO catalyst showed a remarkably superior catalytic activity to that of the Ni-B/TiO 2 or Raney nickel catalyst, and the difference is ascribed to the nature of amorphous structure and the characteristics of amorphous Ni-B particles on MgO.

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“…Nickel boride (Ni 2 B) is well known owing to its effective catalysis [1][2][3][4][5][6], high microhardness [7], high chemical and thermal stability, excellent selectivity and activity for liquid phase reaction [8]. Several routes have been proposed to synthesize Ni 2 B, i.e., boronizng of pure nickel by the powder-pack method [9,10] and ball milling of element components [11].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of nanocrystalline Ni2B via a solvo-thermal route

Feng

Bai

Lü

et al. 2004

Inorganic Chemistry Communications

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Iron, cobalt and nickel boride as precursor of heterogeneous oxazaborolidine catalysts

Cited by 12 publications

References 21 publications

Retracted: Earth‐Abundant Iron Diboride (FeB₂) Nanoparticles as Highly Active Bifunctional Electrocatalysts for Overall Water Splitting

Retracted: Earth‐Abundant Iron Diboride (FeB₂) Nanoparticles as Highly Active Bifunctional Electrocatalysts for Overall Water Splitting

Sulfolene Hydrogenation over an Amorphous Ni−B Alloy Catalyst on MgO

Synthesis of nanocrystalline Ni2B via a solvo-thermal route

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Iron, cobalt and nickel boride as precursor of heterogeneous oxazaborolidine catalysts

Cited by 12 publications

References 21 publications

Retracted: Earth‐Abundant Iron Diboride (FeB2) Nanoparticles as Highly Active Bifunctional Electrocatalysts for Overall Water Splitting

Retracted: Earth‐Abundant Iron Diboride (FeB2) Nanoparticles as Highly Active Bifunctional Electrocatalysts for Overall Water Splitting

Sulfolene Hydrogenation over an Amorphous Ni−B Alloy Catalyst on MgO

Synthesis of nanocrystalline Ni2B via a solvo-thermal route

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Product

Resources

About

Retracted: Earth‐Abundant Iron Diboride (FeB₂) Nanoparticles as Highly Active Bifunctional Electrocatalysts for Overall Water Splitting

Retracted: Earth‐Abundant Iron Diboride (FeB₂) Nanoparticles as Highly Active Bifunctional Electrocatalysts for Overall Water Splitting