n-Si,believed as a promising photoanode candidate,has suffered from sluggish oxygen evolution reaction(OER)kinetics and poor chemical stability when exposed to aqueous ***,CoO_(x)/Ni:CoOOH bilayers were successfully d...
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n-Si,believed as a promising photoanode candidate,has suffered from sluggish oxygen evolution reaction(OER)kinetics and poor chemical stability when exposed to aqueous ***,CoO_(x)/Ni:CoOOH bilayers were successfully deposited on n-Si substrate by atomic layer-deposition(ALD)and photoassisted electrochemical deposition(PED)for stabilizing and catalyzing photoelectrochemical(PEC)water *** comparison to the n-Si/CoO_(x)photoanode as reference,the prepared n-Si/CoO_(x)/Ni:CoOOH photoanode upon the optimized PED process presents a much improved PEC performance for water splitting,with the onset potential cathodically shifted to~1.03 V *** hydrogen electrode(RHE)and the photocurrent density much increased to 20 mA cm^(−2)at 1.23 V *** is revealed that the introduction of Ni dopants increases the work functions of the deposited Ni:CoOOH overlayers,which gives rise to the upward band bending weakened at the n-Si/CoO_(x)/Ni:CoOOH cascading interface while strengthened at the Ni:CoOOH/electrolyte interface(with the band bending shifted from downward to upward),contributing to the decreased and the increased driving forces for charge transfer at the interfaces,***,the balanced driving forces at the interfaces would endow the n-Si/CoO_(x)/Ni:CoOOH photoanode with the best PEC ***,PED has been evidenced superior to ED to dope Ni into CoOOH with the formed overlayer effectively catalyzing and stabilizing PEC water splitting.
Renewable energy, such as solar energy, wind energy, and hydraulic energy, mostly belongs to process energy, which is hard to store, while fossil energy belongs to energy-carrier energy, which can achieve long-term st...
Renewable energy, such as solar energy, wind energy, and hydraulic energy, mostly belongs to process energy, which is hard to store, while fossil energy belongs to energy-carrier energy, which can achieve long-term storage. Current conversion and utilization technologies for all types of energy mainly focus on power generation. Fossil energy is convenient to store, but its conversion and utilization technologies mainly rely on the combustion of fossil fuels for power and thermal energy generation, emitting huge amounts of pollutants and CO2. power and thermal energy are still process energy which is hard to be stored, and the problem of the low-cost, efficient and long-term storage of energy is difficult to solve, which is the fundamental deficiencies of the current energy production and supply system. H2 as an energy-carrier energy enables both clean and efficient use and storage. Therefore, the development of efficient, low-cost, large-scale green H2/power generation is imperative. It is recommended that: (1) new renewable energy units be developed based on integrating H2, thermal energy and power energy poly-generation technology on demand. The already built “sole power generation” renewable energy units should be transformed into H2, thermal energy and power energy poly-generation model, to build a comprehensive energy multi-link supply system that achieves energy storage, transportation and utilization, as well as the full-time, high-efficiency, low-cost conversion and utilization of renewable energy. (2) Developing low-carbon and clean technologies for green H2 and power from carbon-based energy sources, achieving efficient energy conversion and full utilization of resources. (3) Building a new industry for high-value conversion and high-quality utilization of fossil fuels to produce the high-value chemical products instead of pollutants which also provides the best solution for large-capacity and long-term energy storage.
In order to investigate effects of platen super-heaters on the heat deviation in the cross-over pass, numerical simulation of a 600 MW tangentially fired pulverized-coal boiler has been studied. Two cases, buildi...
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We present a facile synthetic strategy to create mesoporous Cu_(2)O nanocrystals with tunable pore structures and surface functional groups of amine derivatives for efficient and preferable electrochemical conversion ...
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We present a facile synthetic strategy to create mesoporous Cu_(2)O nanocrystals with tunable pore structures and surface functional groups of amine derivatives for efficient and preferable electrochemical conversion of CO_(2) into *** structural characteristics of theseCu_(2)O nanocrystals can be manipulated using a set of amine derivatives,such as pyridine,4,4'-bipyridine,and hexamethylenetetramine,during the oxidative etching process of Cu nanocrystals by bubbling gaseous oxygen in N,N-dimethylformamide *** amine derivatives not only serve as surface functional groups but also significantly affect the resulting pore *** synergistic effect of pore structure confinement and surface amine functionalization leads to the superb Faradaic efficiency(FE)of 51.9% for C_(2)H_(4),respectively,together with the C_(2)H_(4) partial current density of -209.4 mA·cm^(-2) at -0.8 V *** hydrogen electrode(RHE).The relatively high selectivity towards C_(2)H_(4) was investigated using DFT simulations,where 4,4'-bipyridine functionalized Cu_(2)O seemed to favor the C_(2)H_(4) formation with the low free energy of the *** study provides a feasible strategy to manipulate the pore structure and surface functionalization of mesoporous Cu_(2)O nanocrystals by regulating the oxidative etching process,which sheds light on the rational preparation of high-performance CO_(2)RR electrocatalysts.
Supercritical carbon dioxide (S-CO2) nuclear energy and power systems have garnered significant attention for flow and heat transfer experiments because of their compact design, advanced circulation methods, and high ...
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Charge-carrier separation is regarded as one of the critical issues of photocatalytic water splitting and could be accelerated by constructing microscopic junctions in *** photocatalysts consisting of different forms ...
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Charge-carrier separation is regarded as one of the critical issues of photocatalytic water splitting and could be accelerated by constructing microscopic junctions in *** photocatalysts consisting of different forms of semiconductor with identical compositions could inherit the advantages of heterojunction-based photocatalysts in charge separation due to the built-in electric field,while omitting the potential drawbacks of interfacial lattice distortion by providing continuous band ***,homojunction-based photocatalysts have recently drawn growing attention in water *** this review,the synthetic approaches to preparing photocatalysts with various homojunction structures including p-n junction,phase junction,and facet junction were introduced,together with a comprehensive analysis and discussion on the latest progress in the application of photocatalytic water *** review work is expected to inspire more related work with promoted research on designing efficient homojunction-based photocatalytic systems for water splitting.
The microlayer present at the bottom of the bubble plays a very important role in heat transfer during nucleation boiling. In this paper, the dynamic characteristics of microlayer at the bottom of boiling bubble in a ...
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In the thermal recovery project of thick oil, there are high standards for steam temperature and flow rate. The solar thermal steam supply system can convert unstable solar energy into stable and efficient carrier hea...
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The ring opening reaction of polycyclic aromatic hydrocarbons (PAHs) is one of the rate-determining steps of coal gasification within supercritical water, while the involvement of water remains debated between additio...
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Elbow wear, which is most likely occurring in pneumatic conveying, becomes a key factor in development of pneumatic conveying. This paper used 3D DEM-CFD to simulate the elbow wear in pneumatic conveying system. Simul...
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