A new approach to the synthesis of molybdenum phosphide via internal oxidation and reduction route

Yao, Zhiwei; Wang, Li; Dong, Haitao

doi:10.1016/j.jallcom.2008.05.048

Cited by 15 publications

(4 citation statements)

References 20 publications

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“…On the other hand, the product obtained at 900 °C shows characteristic signature for MoP. The absence of any characteristic signature for the product obtained at lower temperature (700 °C) implies the growth of amorphous material or the temperature is not sufficient for the growth/phosphidation . The temperature-dependent study suggests that the growth of MoP requires a minimum temperature of 800 °C.…”

Section: Results and Discussionmentioning

confidence: 89%

“…The absence of any characteristic signature for the product obtained at lower temperature (700 °C) implies the growth of amorphous material or the temperature is not sufficient for the growth/phosphidation. 32 The temperature-dependent study suggests that the growth of MoP requires a minimum temperature of 800 °C. The XRD profile for the product obtained at different PMA concentrations (20 and 80 mg/mL) at an annealing temperature 800 °C shows a signature for MoP (Figure S5), confirming the growth of MoP though the diffraction intensity varies with the concentration of precursors.…”

Section: Resultsmentioning

confidence: 99%

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General Approach for the Synthesis of Nitrogen-Doped Carbon Encapsulated Mo and W Phosphide Nanostructures for Electrocatalytic Hydrogen Evolution

Chakrabartty

Sahu

Raj

2020

ACS Appl. Energy Mater.

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A general strategy for the synthesis of the core-shell nanostructure of nitrogen-doped carbon encapsulated MoP and WP (MoP@NC and WP@NC) and the electrochemical hydrogen evolution reaction (HER) are demonstrated. The synthetic procedure involves the self-assembling of polyoxometalate (M = Mo/W) and phytic acid on a polyetheleneimine backbone and the subsequent pyrolysis of the self-assembled supramolecular aggregates in an inert atmosphere without a traditional phosphidating agent. MoP@NC has a quasi-spherical shape with a MoP core (57 nm) and nitrogen doped porous carbon shell, whereas WP@ NC has a nitrogen-doped carbon coated rodlike nanostructure. MoP@NC has a large amount of pyridinic (∼59%) and Mo-bonded (∼33%) nitrogen. MoP@NC is highly active toward hydrogen evolution reaction (HER) and delivers the benchmark current density 10 mA/cm 2 at an overpotential of 52, 106, and 171 mV in acidic, alkaline and neutral pH, respectively. It shows a Tafel slope of 49 mV/dec, high turnover frequency (0.28 s −1 at η = 100 mV), and faradaic efficiency (96%) in acidic electrolyte. MoP@NC has remarkable durability in acidic and alkaline pH with a negligible increase in overpotential after 1000 extensive repeated potential cycles. The encapsulating nitrogen-doped carbon shell protects the active catalyst from corrosion and the catalyst retains its phase purity and structural integrity even after 10 h of long-time hydrogen evolution at constant potential. The outstanding HER activity of MoP@NC is accounted for by the small particle size, large surface area, and strong chemical coupling between MoP and nitrogendoped carbon.

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Section: Results and Discussionmentioning

confidence: 89%

Section: Resultsmentioning

confidence: 99%

General Approach for the Synthesis of Nitrogen-Doped Carbon Encapsulated Mo and W Phosphide Nanostructures for Electrocatalytic Hydrogen Evolution

Chakrabartty

Sahu

Raj

2020

ACS Appl. Energy Mater.

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“…The TMP can be synthesized following different methods and a plethora of their modifications. Methods, such as solution-phase reactions [89,90], gas-solid reactions [91], and solvothermal reactions [92], have been applied for the preparation of unsupported and supported TMPs.…”

Section: Tmps Preparation Strategiesmentioning

confidence: 99%

Transition Metal Phosphides (TMP) as a Versatile Class of Catalysts for the Hydrodeoxygenation Reaction (HDO) of Oil-Derived Compounds

et al. 2022

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Hydrodeoxygenation (HDO) reaction is a route with much to offer in the conversion and upgrading of bio-oils into fuels; the latter can potentially replace fossil fuels. The catalyst’s design and the feedstock play a critical role in the process metrics (activity, selectivity). Among the different classes of catalysts for the HDO reaction, the transition metal phosphides (TMP), e.g., binary (Ni2P, CoP, WP, MoP) and ternary Fe-Co-P, Fe-Ru-P, are chosen to be discussed in the present review article due to their chameleon type of structural and electronic features giving them superiority compared to the pure metals, apart from their cost advantage. Their active catalytic sites for the HDO reaction are discussed, while particular aspects of their structural, morphological, electronic, and bonding features are presented along with the corresponding characterization technique/tool. The HDO reaction is critically discussed for representative compounds on the TMP surfaces; model compounds from the lignin-derivatives, cellulose derivatives, and fatty acids, such as phenols and furans, are presented, and their reaction mechanisms are explained in terms of TMPs structure, stoichiometry, and reaction conditions. The deactivation of the TMP’s catalysts under HDO conditions is discussed. Insights of the HDO reaction from computational aspects over the TMPs are also presented. Future challenges and directions are proposed to understand the TMP-probe molecule interaction under HDO process conditions and advance the process to a mature level.

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“…and carbon-containing materials. [36][37][38][39][40] It should be noted that despite the successful use of the carbothermal approach to prepare heterogeneous catalysts based on TMPs for various processes, its use for phosphide-containing electrocatalysts (HER, ORR, OER), for example, 34,41,42 is relatively little studied.…”

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confidence: 99%

Facile Carbothermal Synthesis of Metal Phosphides-Based Multifunctional Electrocatalysts via Polyaniline Doped with Phosphoric Acid

Mazur,

Pariiska,

Kurys

et al. 2024

J. Electrochem. Soc.

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Transition metal phosphides (TMPs) and their composites are promising non-platinum electrocatalysts for hydrogen evolution (HER), oxygen evolution (OER), and oxygen reduction (ORR) reactions. But traditional methods to obtain these electrocatalysts are usually multi-step and include the participation of hazardous phosphorus compounds during phosphidation. Here, the possibility of using a polyaniline doped with phosphoric acid (PANI∙H3PO4) – as a source of C, N and P simultaneously - to obtain composites based on N,P-doped carbon and nano- and/or submicron TMP particles as HER, OER and ORR electrocatalysts is demonstrated. The pyrolysis of PANI∙H3PO4 together with Co, Ni, Mo, or Fe salt allows the formation of such composite electrocatalysts by the carbon thermal reduction route. Regardless of the pH of the electrolyte, the MoP-based electrocatalyst is characterized in HER by the smallest Tafel slope and overpotential of hydrogen evolution and also exhibits high stability during long-term operation. At the same time, other composites are multifunctional electrocatalysts possessing activity not only in HER, but also in OER and ORR. The proposed approach can be a starting point for a simple, universal in choice of d-metal, and environmentally attractive preparation of multifunctional TMP-based electrocatalysts with further improvement of their performance.

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A new approach to the synthesis of molybdenum phosphide via internal oxidation and reduction route

Cited by 15 publications

References 20 publications

General Approach for the Synthesis of Nitrogen-Doped Carbon Encapsulated Mo and W Phosphide Nanostructures for Electrocatalytic Hydrogen Evolution

General Approach for the Synthesis of Nitrogen-Doped Carbon Encapsulated Mo and W Phosphide Nanostructures for Electrocatalytic Hydrogen Evolution

Transition Metal Phosphides (TMP) as a Versatile Class of Catalysts for the Hydrodeoxygenation Reaction (HDO) of Oil-Derived Compounds

Facile Carbothermal Synthesis of Metal Phosphides-Based Multifunctional Electrocatalysts via Polyaniline Doped with Phosphoric Acid

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