Sentences with word «photocathode»
Chemists at The University of Texas at Arlington have been the first to demonstrate that an organic semiconductor polymer called polyaniline is a promising photocathode material for the conversion of carbon dioxide into alcohol fuels without the need for a co-catalyst.
sciencedaily.com
NREL shows graded catalytic - protective layer boosts longevity of high - efficiency photocathodes for renewable hydrogen
Currently, the majority of the required voltage between the composite photocathode and a platinum counter electrode of around 1.8 volts is still coming from a battery.
Researchers at the US Department of Energy's National Renewable Energy Laboratory (NREL) have developed a method which boosts the longevity of high - efficiency photocathodes in photoelectrochemical water - splitting devices.
From left, Diana Cedeno, Gary Moore and Alexandra Krawicz of the Joint Center for Artificial Photosynthesis conducted an efficiency analysis study of a unique photocathode material designed to store solar energy in hydrogen molecules.
However, realizing this artificial photosynthesis ideal will require a number of technological breakthroughs including high performance photocathodes that can catalyze fuel production from sunlight alone.
«Artificial photosynthesis: New, stable photocathode with great potential.»
«It's satisfying to find a new twist on ideas dating back to the start of the 20th century, and as a materials physicist it is fascinating to be looking for materials which would operate in an environment so different to standard photocathodes.»
«Finding an inexpensive, readily - available photocathode material could open up new options to create cheaper, more energy - effective solar fuel cells.»
Structured Si / Co-P photocathodes: Designs for efficient light absorption in earth abundant solar fuels devices P. Kempler, M. Gonzalez, K. Papadantonakis, N. Lewis
More recently, Hess and his research team have studied plasmonic nanoparticles and novel photocathode materials using electron and optical microscopies.
Dr. Ager's research interests include the fundamental electronic and transport characteristics of photovoltaic materials, development of new photoanodes and photocathodes based on abundant elements for solar fuels production, and the development of new oxide - and sulfide - based transparent conductors.
Within JCAP, Dr. Haber's research focus surrounds the application of high - throughput methods to integrate promising lead materials into functional assemblies, such as integration of electrocatalyst libraries with light absorbers to produce functional photoanode and photocathode assemblies.
STIS uses three detectors: a cesium iodide photocathode Multi-Anode Microchannel Array (MAMA) for 115 to 170 nm, a cesium telluride MAMA for 165 to 310 nm, and a Charge Coupled Device (CCD) for 165 to 1000 nm.
In JCAP, Dr. Persson's research centers around photocathodes which carry out the carbon dioxide reduction reaction that are a central to the establishment of efficient, sustainable CO2 reduction.
We report on a highly active p - GaInP2 photocathode protected through a 35 - nm TiO2 layer functionalized by a cobaloxime molecular catalyst (GaInP2 — TiO2 — cobaloxime).
The new JCAP photocathode construct consists of the semiconductor gallium phosphide and a molecular cobalt - containing hydrogen production catalyst from the cobaloxime class of compounds.
«The modular aspect of our method allows independent modification of the light - absorber, linking material and catalyst, which means it can be adapted for use with other catalysts tethered over structured photocathodes as new materials and discoveries emerge,» Moore says.
«We believe our method provides researchers at JCAP and elsewhere with an important tool for developing integrated photocathode materials that can be used in future solar - fuel generators as well as other technologies capable of reducing net carbon dioxide emissions.»
To this end, once photoanodes have used solar energy to split water molecules, JCAP scientists need high performance semiconductor photocathodes that can use solar energy to catalyze fuel production.
A scanning electron microscopy shows a cross section of the composite photocathode (left).
Gary Moore, a chemist and principal investigator with Berkeley Lab's Physical Biosciences Division, led an efficiency analysis study of a unique photocathode material he and his research group have developed for catalyzing the production of hydrogen fuel from sunlight.
Topics of research in the program include: investigations of novel materials as photoanodes for water oxidation and photocathodes for hydrogen production and carbon dioxide reduction, design of protection schemes against photocorrosion, theoretical modeling and computational simulations of band gaps and corrosion behavior, and development of new experimental techniques for characterization of optoelectronic properties of semiconductors.
When sunlight hits the device, electrons are knocked out of the photocathode and bounce through the gas to the outer pane without being absorbed or lost.
The transparency of the photocathode could be varied, leading to the possibility of tinted windows generating solar power.
The inner window is coated with a special material, which acts a source of electrons under illumination by sunlight — this is called a «photocathode.»
Other components of the system, such as the photocathode, will also need to be perfected.
«Without a membrane, the photoanode and photocathode are close enough to each other to conduct electricity, and if you also have bubbles of highly reactive hydrogen and oxygen gases being produced in the same place at the same time, that is a recipe for disaster,» Lewis says.
The photoanode uses sunlight to oxidize water molecules to generate oxygen gas, protons, and electrons, while the photocathode recombines the protons and electrons to form hydrogen gas.
The final product, Gregoire said, would look something like a solar panel and involve three components: the photoanode, a photocathode, which forms the fuel, and a membrane that separates the two.
The photocathode materials research is supported by the Chemical Imaging Initiative and is designed to impact next generation light source development and further ultrafast transmission electron microscopy.
According to Business Standard, the new system utilizes three main components: a membrane and two electrodes — one photoanode and one photocathode.
«Without a membrane, the photoanode and photocathode are close enough to each other to conduct electricity, and if you also have bubbles of highly reactive hydrogen and oxygen gases being produced in the same place at the same time, that is a recipe for disaster,» Lewis says regarding his findings published in PNAS.
The electrons travel through a circuit to the photocathode where they combine with the hydrogen protons to make hydrogen gas (H2).
Next, Lewis and colleagues need to perfect the photocathode.
The artificial leaf developed at the Caltech Joint Center for Artificial Photosynthesis (JCAP) consists of three main components: two electrodes — a photoanode and a photocathode — and a membrane.
With this approach, hydrogen fuel can be produced off a photocathode using sunlight.
«In coupling the absorption of visible light with the production of hydrogen in one material, we can generate a fuel simply by illuminating our photocathode,» Moore says.