Single-source-precursor synthesis of porous W-containing SiC-based nanocomposites as hydrogen evolution reaction electrocatalysts

Yu, Zhaoju; Mao, Kangwei; Feng, Yao

doi:10.1007/s40145-021-0508-8

Cited by 43 publications

(31 citation statements)

References 43 publications

(41 reference statements)

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“…For instance, tungsten carbide (WC) is a promising candidate for transition metal‐based HER electrocatalysts due to the low cost, the Pt‐like electronic properties, and the stable catalytic performance. [ 1 , 5 , 8 ] Nevertheless, typical WC catalyst synthesis methods, such as carbonization of tungsten (W) or W‐based precursors, result in bulk materials or nanoparticles with poor crystallinity and impurities, which negatively affect HER performance. Moreover, the intermediate product will also cause pollution and create harsh experimental conditions.…”

Section: Introductionmentioning

confidence: 99%

Robust Porous WC‐Based Self‐Supported Ceramic Electrodes for High Current Density Hydrogen Evolution Reaction

Wang

Dong

et al. 2022

Advanced Science

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Developing an economical, durable, and efficient electrode that performs well at high current densities and is capable of satisfying large-scale electrochemical hydrogen production is highly demanded. A self-supported electrocatalytic "Pt-like" WC porous electrode with open finger-like holes is produced through industrial processes, and a tightly bonded nitrogen-doped WC/W (WC-N/W) heterostructure is formed in situ on the WC grains. The obtained WC-N/W electrode manifests excellent durability and stability under multi-step current density in the range of 30-1000 mA cm −2 for more than 220 h in both acidic and alkaline media. Although WC is three orders of magnitude cheaper than Pt, the produced electrode demonstrates comparable hydrogen evolution reaction performance to the Pt electrode at high current density. Density functional theory calculations attribute its superior performance to the electrode structure and the modulated electronic structure at the WC-N/W interface.

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Section: Introductionmentioning

confidence: 99%

Robust Porous WC‐Based Self‐Supported Ceramic Electrodes for High Current Density Hydrogen Evolution Reaction

Wang

Dong

et al. 2022

Advanced Science

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“…For the synthesis of Mo 2 C-xNi(NO 3 ) 2 /CFP (x = 0.5-4 M), nickel nitrate solution with different concentrations were first prepared by weighing Ni(NO 3 ) 2 •6H 2 O in different amounts (5,10,15,20,25,30,35, and 40 mmol), which were dissolved in 10 mL distilled water. In a typical synthesis process, CFP (15 mm × 10 mm, with a thickness of ca.…”

Section: Materials Preparationmentioning

confidence: 99%

“…Generally, noble metal-(e.g., Pt- [11], Ru- [12], and Ir- [13]) based catalysts have superior catalytic performance for HER, while their scarcity in the earth crust makes them very costly, thereby hampering its practical applications in large scale. In this context, noble metal-free catalysts for water splitting [14,15] have attracted increasing attentions, which include but not limited to earth-abundant carbon-based and transition-metal-based electrocatalysts [16,17].…”

Section: Introductionmentioning

confidence: 99%

Experimental and DFT studies of flower-like Ni-doped Mo2C on carbon fiber paper: A highly efficient and robust HER electrocatalyst modulated by Ni(NO3)2 concentration

Zhang

Huang

et al. 2022

J Adv Ceram

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Developing highly efficient and stable non-precious metal catalysts for water splitting is urgently required. In this work, we report a facile one-step molten salt method for the preparation of self-supporting Ni-doped Mo2C on carbon fiber paper (Ni-Mo2CCB/CFP) for hydrogen evolution reaction (HER). The effects of nickel nitrate concentration on the phase composition, morphology, and electrocatalytic HER performance of Ni-doped Mo2C@CFP electrocatalysts was investigated. With the continuous increase of Ni(NO3)2 concentration, the morphology of Mo2C gradually changes from granular to flower-like, providing larger specific surface area and more active sites. Doping nickel (Ni) into the crystal lattice of Mo2C largely reduces the impedance of the electrocatalysts and enhances their electrocatalytic activity. The as-developed Mo2C-3 M Ni(NO3)2/CFP electrocatalyst exhibits high catalytic activity with a small overpotential of 56 mV at a current density of 10 mA·cm−2. This catalyst has a fast HER kinetics, as demonstrated by a very small Tafel slope of 27.4 mV·dec−1, and persistent long-term stability. A further higher Ni concentration had an adverse effect on the electrocatalytic performance. Density functional theory (DFT) calculations further verified the experimental results. Ni doping could reduce the binding energy of Mo-H, facilitating the desorption of the adsorbed hydrogen (Hads) on the surface, thereby improving the intrinsic catalytic activity of Ni-doped Mo2C-based catalysts. Nevertheless, excessive Ni doping would inhibit the catalytic activity of the electrocatalysts. This work not only provides a simple strategy for the facile preparation of non-precious metal electrocatalysts with high catalytic activity, but also unveils the influence mechanism of the Ni doping concentration on the HER performance of the electrocatalysts from the theoretical perspective.

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“…Hydrogen is a clean, sustainable, and zero-carbon emission energy source, which is widely considered to replace traditional fossil fuels [5][6][7]. Large scale production of high-purity hydrogen can be obtained by the electrolysis of water [8,9]. Platinum (Pt)-based noble metals are the most effective hydrogen evolution reaction (HER) electrocatalysts, but their high cost and insufficient natural resources severely limit their wide application [10].…”

Section: Introductionmentioning

confidence: 99%

Self-supported porous heterostructure WC/WO3−x ceramic electrode for hydrogen evolution reaction in acidic and alkaline media

et al. 2022

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Tungsten carbide (WC)-based materials are widely considered as the hydrogen evolution reaction (HER) process catalysts due to their “Pt-like” electronic structure. Nonetheless, traditional powder electrodes have a high cost, and display problems related to the process itself and the poor stability over operation time. This paper presented a self-supported asymmetric porous ceramic electrode with WO3−x whiskers formed in situ on the walls of the finger-like holes and membrane surface, which was prepared by combining phase inversion tape-casting, pressureless sintering, and thermal treatment in a CO2 atmosphere. The optimized ceramic electrode displayed good catalytic HER activity and outstanding stability at high current densities. More specifically, it demonstrated the lowest overpotentials of 107 and 123 mV and the lowest Tafel slopes of 59.3 and 72.4 mV·dec−1 at 10 mA·cm−2 in acidic and alkaline media, respectively. This superior performance was ascribed to the structure of the ceramic membrane and the charge transfer efficiency, which was favored by the in situ developed WC/WO3−x heterostructure and the oxygen vacancies.

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Single-source-precursor synthesis of porous W-containing SiC-based nanocomposites as hydrogen evolution reaction electrocatalysts

Cited by 43 publications

References 43 publications

Robust Porous WC‐Based Self‐Supported Ceramic Electrodes for High Current Density Hydrogen Evolution Reaction

Robust Porous WC‐Based Self‐Supported Ceramic Electrodes for High Current Density Hydrogen Evolution Reaction

Experimental and DFT studies of flower-like Ni-doped Mo2C on carbon fiber paper: A highly efficient and robust HER electrocatalyst modulated by Ni(NO3)2 concentration

Self-supported porous heterostructure WC/WO3−x ceramic electrode for hydrogen evolution reaction in acidic and alkaline media

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