Nov 15, 2019 11:35 PM
(This post was last modified: Nov 16, 2019 08:10 PM by C C.)
New Material Breaks World Record Turning Heat into Electricity
https://www.tuwien.at/en/tu-wien/news/ne...ectricity/
A new type of material generates electrical current very efficiently from temperature differences. This allows sensors and small processors to supply themselves with energy wirelessly.
INTRO: Thermoelectric materials can convert heat into electrical energy. This is due to the so-called Seebeck effect: If there is a temperature difference between the two ends of such a material, electrical voltage can be generated and current can start to flow. The amount of electrical energy that can be generated at a given temperature difference is measured by the so-called ZT value: The higher the ZT value of a material, the better its thermoelectric properties.
The best thermoelectrics to date were measured at ZT values of around 2.5 to 2.8. Scientists at TU Wien (Vienna) have now succeeded in developing a completely new material with a ZT value of 5 to 6. It is a thin layer of iron, vanadium, tungsten and aluminium applied to a silicon crystal. The new material is so effective that it could be used to provide energy for sensors or even small computer processors. Instead of connecting small electrical devices to cables, they could generate their own electricity from temperature differences. The new material has now been presented in the journal Nature... (MORE)
New Catalyst Efficiently Produces Hydrogen from Seawater
https://www.uh.edu/news-events/stories/2...talyst.php
INTRO: Seawater is one of the most abundant resources on earth, offering promise both as a source of hydrogen – desirable as a source of clean energy – and of drinking water in arid climates. But even as water-splitting technologies capable of producing hydrogen from freshwater have become more effective, seawater has remained a challenge.
Researchers from the University of Houston have reported a significant breakthrough with a new oxygen evolution reaction catalyst that, combined with a hydrogen evolution reaction catalyst, achieved current densities capable of supporting industrial demands while requiring relatively low voltage to start seawater electrolysis. Researchers say the device, composed of inexpensive non-noble metal nitrides, manages to avoid many of the obstacles that have limited earlier attempts to inexpensively produce hydrogen or safe drinking water from seawater. (MORE)
https://www.tuwien.at/en/tu-wien/news/ne...ectricity/
A new type of material generates electrical current very efficiently from temperature differences. This allows sensors and small processors to supply themselves with energy wirelessly.
INTRO: Thermoelectric materials can convert heat into electrical energy. This is due to the so-called Seebeck effect: If there is a temperature difference between the two ends of such a material, electrical voltage can be generated and current can start to flow. The amount of electrical energy that can be generated at a given temperature difference is measured by the so-called ZT value: The higher the ZT value of a material, the better its thermoelectric properties.
The best thermoelectrics to date were measured at ZT values of around 2.5 to 2.8. Scientists at TU Wien (Vienna) have now succeeded in developing a completely new material with a ZT value of 5 to 6. It is a thin layer of iron, vanadium, tungsten and aluminium applied to a silicon crystal. The new material is so effective that it could be used to provide energy for sensors or even small computer processors. Instead of connecting small electrical devices to cables, they could generate their own electricity from temperature differences. The new material has now been presented in the journal Nature... (MORE)
New Catalyst Efficiently Produces Hydrogen from Seawater
https://www.uh.edu/news-events/stories/2...talyst.php
INTRO: Seawater is one of the most abundant resources on earth, offering promise both as a source of hydrogen – desirable as a source of clean energy – and of drinking water in arid climates. But even as water-splitting technologies capable of producing hydrogen from freshwater have become more effective, seawater has remained a challenge.
Researchers from the University of Houston have reported a significant breakthrough with a new oxygen evolution reaction catalyst that, combined with a hydrogen evolution reaction catalyst, achieved current densities capable of supporting industrial demands while requiring relatively low voltage to start seawater electrolysis. Researchers say the device, composed of inexpensive non-noble metal nitrides, manages to avoid many of the obstacles that have limited earlier attempts to inexpensively produce hydrogen or safe drinking water from seawater. (MORE)