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International Journal of Hydrogen Energy
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Abstract Ni/Al2O3 catalyst is the one of promising catalysts for enhancing H2 production from supercritical water gasification (SCWG) of biomass. However, due to carbon deposition, the deactivation of Ni/Al2O3 catalyst is still a serious issue. In this work, the effects of lanthanum (La) as promoter on the properties and catalytic performance of Ni/Al2O3 in SCWG of food waste were investigated. La promoted Ni/Al2O3 catalysts with different La loading content (3–15 wt%) were prepared via impregna...
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Abstract The density functional theory (DFT) calculations were performed to investigate the stability of the S-doped Fe–N2G electrocatalysts, as well as ORR mechanism and activity. The most stable configuration is the Fe–N2S1G because of forming a strong bond structure of Fe–S. In addition, the structures of Fe–N2S3G and Fe–N2S4G also exhibit the higher stability compared to the undoped Fe–N2G. According to the distinct charge difference on the surface, the O-contained intermediates would like t...
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Abstract When applied in the hydrogen refueling station, the diaphragm compressor with super-high pressure ratio will experience a high discharge temperature of over 200 °C, especially for that with large capacity and horsepower. Considering the thermal stress, the structural strength and deformation of the cylinder head are crucial to the reliability and efficiency of the diaphragm compressor. In this paper, a thermal-structural coupled analysis was proposed, based on which the deformation and ...
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Abstract Ammonia production via electroreduction of N2 and water under mild conditions is emerging as a promising alternative to the fossil fuels-reliance and CO2 emitting Haber-Bosch process. However, the achievement of high Faradaic efficiency and high ammonia formation rate is still challenging. Here, we demonstrate how ammonia can be selectively produced from N2 and H2O via a two-step iron-based cyclic process using a molten hydroxide electrolyte. The first step is the production of Fe by el...
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Abstract As electricity demand can vary considerably and unpredictably, it is necessary to integrate energy storage with power generation systems. This study investigates a solid oxide and molten carbonate fuel cell system integrated with a gas turbine (GT) for power generation. The advanced adiabatic compressed air energy storage (AA-CAES) system is designed to enhance the system flexibility. Simulations of the proposed power system are performed to demonstrate the amount of power that can supp...
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Abstract This paper presents an in-depth laboratory technology assessment of a 2016 Toyota Mirai Fuel Cell (FC) vehicle based on chassis dynamometer testing. The 114.6 kW FC stack has a high dynamic response, which makes this powertrain a FC-dominant hybrid electric vehicle. The measured peak efficiency is 66.0% FC stack and 63.7% FC system with an idle hydrogen flow rate of 4.39 g/hr. The high FC system efficiencies at low loads match typical vehicle power spectrums, resulting in a high average...
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Abstract N/S dual-doped graphene was prepared by one-pot process using graphene oxide as raw material and thiourea and urea as reduction-dopants. The field emission scanning electron microscopy (FESEM), X-ray powder diffraction (XRD), Raman spectroscopy (Raman), nuclear magnetic resonance (NMR) spectroscopy, X-ray photoelectron spectroscopy (XPS), and other means were used to characterize the microstructure and morphology of the samples. The electrochemical properties of the samples were tested ...
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Abstract The development of efficient and non-noble catalyst is of great significance to hydrogen generation techniques. Three surface-oxidized cobalt borides of Co–B–O@CoxB (x = 0.5, 1 and 2) have been synthesized that can functionalize as active catalysts in both alkaline water electrolysis and the hydrolysis of sodium borohydride (NaBH4) solution. It is discovered that oxidation layer and low boron content favor the oxygen evolution reaction (OER) activity of Co–B–O@CoxB in alkaline water ele...
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Abstract Low-cost transition metal oxides (TMO) has received extensive attention as new-generation oxygen evolution reaction (OER) catalysts. In recent years, introducing oxygen defects via various strategies emerged as an efficient way to increase electro-catalytic activity of TMO. Despite many successful examples, the physical and chemical origin of such enhanced OER activity induced by oxygen defects is still not well understood. In this work, we systematically investigate the correlation bet...
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Abstract In this study, the cracking phenomenon of methane taking place in a cylindrical cavity of 16 cm in diameter and 40 cm in length under the heat of concentrated solar radiation without any catalyst is analysed. Three cases have been chosen; in all cases the primary phase contains methane and hydrogen gases. In the first case, we consider two phases; the secondary phase is a homogeneous carbon black powder with 50 nm of diameter; in the second case we have three phases where the two second...
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Catalysis
Inorganic chemistry
Chemistry
Hydrogen production
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