Researchers from the Helmholtz-Zentrum Hereon, together with the Technical University of Hamburg and Aalborg University, have developed a new selective emitter based on iridium for thermophotovoltaics. Iridium was thus used for the first time as a material for an emitter, and in the experiments, it showed particular endurance at high temperatures around 1,000°C. Their study results were published in the journal Advanced Materials and open up new perspectives for producing electricity from heat.
and the photovoltaic cell and emit only a certain part of the radiation while suppressing the other.
The challenge here is that the conversion of heat into electricity takes place at high temperatures around 1,000°C—the emitter must therefore be able to withstand these temperatures without losing the accuracy of its selectivity. The researchers have now succeeded in producing a new emitter based on the resistant metal iridium that can withstand these conditions without losing its effectiveness.stability," says Alexander Petrov, who works on optical properties of materials at TUHH.
"By avoiding the adverse effects of oxidation, we have unlocked the potential for more efficient and sustainable systems," reports Gnanavel Vaidhyanathan Krishnamurthy, lead author of the study and a scientist at the Helmholtz-Zentrum Hereon."This innovation opens the doors to new possibilities in waste heat recovery, solar thermal power generation and beyond."In thermophotovoltaics, as in photovoltaics, radiant energy is converted into electricity by a photovoltaic cell.
At high temperatures, however, most metals oxidize and the function of the emitter fails. As the researchers were able to show, the newly developed selectivemade of iridium and hafnium oxide retains its function completely over 100 hours at 1,000°C—the metal withstands the demanding challenges without any losses, as the researchers were able to show through X-ray examinations.
, securing a constant power supply is of great importance. Thermophotovoltaics could not only generate electricity from industrial waste heat, but also make an important contribution to the conversion of the energy supply to renewable energies. Here, the energy generated by photovoltaics and
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