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US-UK Collaboration on Fossil Energy Advanced Materials: Task 2—Materials for Advanced Boiler and Oxy-combustion Systems(NETL-US)
Creators: Holcomb, Gordon; Tylczak, Joseph; Carney, Casey
Improved Modeling of Naturally Fractured Reservoirs by Quantitatively Handling Flow Convergence into the Wellbore
Creators: Crandall, Dustin [National Energy Technology Lab. (NETL), Morgantown, WV (United States)]; Stadelman, Matthew [National Energy Technology Lab. (NETL), Morgantown, WV (United States)]
The role of Sb in solar cell material Cu2ZnSnS4
Creators: Zhang, Xiao li; Han, Miao miao; Zeng, Zhi; Duan, Yuhua
Description: In this study, based on first-principles calculations we report a possible mechanism of the efficiency improvement of the Sb-doped Cu2ZnSnS4 (CZTS) solar cells from the Sb-related defect point of view. Different from Sb in CuInSe2 which substituted the Cu atomic site and acted as group-13 elements on the Cu-poor growth condition, we find out that Sb prefers to substitute Sn atomic site and acts as group-14 elements on the Cu-poor growth condition in CZTS. At low Sb concentration, SbSn produces a deep defect level which is detrimental for the solar cell application. At high Sb concentration, Sb 5s states form an isolated half-filled intermediate band at 0.5 eV above the valence band maximum which will increase the photocurrent as well as the solar cell efficiency.
Hydraulic fracturing system and method
Creators: Ciezobka, Jordan; Salehi, Iraj
Description: A hydraulic fracturing system and method for enhancing effective permeability of earth formations to increase hydrocarbon production, enhance operation efficiency by reducing fluid entry friction due to tortuosity and perforation, and to open perforations that are either unopened or not effective using traditional techniques, by varying a pump rate and/or a flow rate to a wellbore.
High Materials Performance in Supercritical CO2 in Comparison with Atmospheric Pressure CO2 and Supercritical Steam
Creators: Holcomb, Gordon [National Energy Technology Lab. (NETL), Pittsburgh, PA, (United States)]; Tylczak, Joseph [National Energy Technology Lab. (NETL), Pittsburgh, PA, (United States)]; Carney, Casey [National Energy Technology Lab. (NETL), Pittsburgh, PA, (United States)]; Dogan, Omer N. [National Energy Technology Lab. (NETL), Pittsburgh, PA, (United States)]
Description: This presentation covers environments (including advanced ultra-supercritical (A-USC) steam boiler/turbine and sCO2 indirect power cycle), effects of pressure, exposure tests, oxidation results, and mechanical behavior after exposure.
Nanocomposite thin films for optical temperature sensing
Creators: Ohodnicki, Jr., Paul R.; Brown, Thomas D.; Buric, Michael P.; Matranga, Christopher
Description: The disclosure relates to an optical method for temperature sensing utilizing a temperature sensing material. In an embodiment the gas stream, liquid, or solid has a temperature greater than about 500.degree. C. The temperature sensing material is comprised of metallic nanoparticles dispersed in a dielectric matrix. The metallic nanoparticles have an electronic conductivity greater than approximately 10.sup.-1 S/cm at the temperature of the temperature sensing material. The dielectric matrix has an electronic conductivity at least two orders of magnitude less than the dispersed metallic nanoparticles at the temperature of the temperature sensing material. In some embodiments, the chemical composition of a gas stream or liquid is simultaneously monitored by optical signal shifts through multiple or broadband wavelength interrogation approaches. In some embodiments, the dielectric matrix provides additional functionality due to a temperature dependent band-edge, an optimized chemical sensing response, or an optimized refractive index of the temperature sensing material for integration with optical waveguides.
Methane-rich syngas production from hydrocarbon fuels using multi-functional catalyst/capture agent
Creators: Siefert, Nicholas S.; Shekhawat, Dushyant; Berry, David A.; Surdoval, Wayne A.
Description: The disclosure provides a gasification process for the production of a methane-rich syngas at temperatures exceeding 400.degree. C. through the use of an alkali hydroxide MOH, using a gasification mixture comprised of at least 0.25 moles and less than 2 moles of water for each mole of carbon, and at least 0.15 moles and less than 2 moles of alkali hydroxide MOH for each mole of carbon. These relative amounts allow the production of a methane-rich syngas at temperatures exceeding 400.degree. C. by enabling a series of reactions which generate H.sub.2 and CH.sub.4, and mitigate the reforming of methane. The process provides a methane-rich syngas comprised of roughly 20% (dry molar percentage) CH.sub.4 at temperatures above 400.degree. C., and may effectively operate within an IGFC cycle at reactor temperatures between 400-900.degree. C. and pressures in excess of 10 atmospheres.
High Temperature Oxidation of Ni-base Alloys and Stainless Steels in Supercritical CO2 for Power Systems Applications Exposures
Creators: Holcomb, Gordon
Phase field modeling of microstructure evolution and concomitant effective conductivity change in solid oxide fuel cell electrodes
Creators: Lei, Yinkai; Cheng, Tian-Le [National Energy Technology Lab. (NETL), Albany, OR (United States)]; Wen, Youhai [National Energy Technology Lab. (NETL), Albany, OR (United States)]
Operation of the NETL Chemical Looping Reactor with Natural Gas and a Novel Copper-Iron Material
Creators: Straub, Doug; Bayham, Sanuel; Weber, Justin
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