Hafnia-plugged microcavities for thermal stability of selective emitters
نویسندگان
چکیده
منابع مشابه
Three-Dimensional Metallo-Dielectric Selective Thermal Emitters With High-Temperature Stability for Thermophotovoltaic Applications
Selective thermal emitters concentrate most of their spontaneous emission in a spectral band much narrower than a blackbody. When used in a thermophovoltaic energy conversion system, they become key elements defining both its overall system efficiency and output power. Selective emitters' radiation spectra must be designed to match their accompanying photocell's band gap and, simultaneously, wi...
متن کاملFabrication of an Omnidirectional 2D Photonic Crystal Emitter for Thermophotovoltaics
In a thermophotovoltaic (TPV) system, a heat source brings an emitter to incandescence and the spectrally confined thermal radiation is converted to electricity by a low-bandgap photovoltaic (PV) cell. Efficiency is dominated by the emitter’s ratio of in-band emissivity (convertible by the PV cell) to out-of-band emissivity (inconvertible). Two-dimensional photonic crystals (PhCs) offer high in...
متن کاملHigh-temperature stability and selective thermal emission of polycrystalline tantalum photonic crystals.
We present the results of extensive characterization of selective emitters at high temperatures, including thermal emission measurements and thermal stability testing at 1000 °C for 1h and 900 °C for up to 144 h. The selective emitters were fabricated as 2D photonic crystals (PhCs) on polycrystalline tantalum (Ta), targeting large-area applications in solid-state heat-to-electricity conversion....
متن کاملShape Selective Pillared Clay Catalysts for P-Xylene Production
Shape selective xylene production is very important in the polymer industry because of its extensive use as raw material for monomer preparation. The acidity associated with the Lewis and Broensted centers present in the pillars interlayered clay and its textural properties allows good catalytic activity and shape selectivity toward p-xylene production. So, in the present study, ultrasonic and ...
متن کاملThick Sputtered Tantalum Coatings for High-Temperature Energy Conversion Applications
Thick sputtered tantalum (Ta) coatings on Inconel were investigated as a potential replacement for bulk refractory metal substrates used for high-temperature emitters and absorbers in thermophotovoltaic energy conversion applications. In these applications, high-temperature stability and high reflectance of the surface in the infrared wavelength range are critical in order to sustain operationa...
متن کامل