Summary of the technology
Super black coating based on carbon nanotubes
Keywords: black, absorber, selective coatings, green, solar
Project ID : 15-2013-2915
Description of the technology
Simple system eliminates the need for specialized application equipment
Solar energy, Thermo-solar, Nanoparticles, Carbon nanotubes, Stray light, Black coatings
Proof of concept
- A new, low-cost, black coating based on carbon nanotubes (CNTs), which form the most efficient light-absorbing materials available
- High absorptance (>97%) coating suitable for a wide range of wavelengths (UV-IR)
- High stability at elevated temperatures
- Excellent adhesion to various surfaces
- Excellent performance in preventing stray light in optical devices
- Wet-deposition based spray
A new black coating based on carbon nanotubes, the most efficient light-absorbing material available, is formulated in liquid paints and inks.
- Main advantages of the new formulation and coating:
- Application by simple and rapid process, e.g., spraying or dipping.
- Low-cost application process with no need for special high-cost equipment such as used in sputtering processes.
- Very high absorptance, thermal stability and excellent adhesion
- Extremely low reflectance (stray light prevention)
- Suitable for small optical devices and large scale solar panel absorbers.
- Formulation has been completed and tested extensively
- Large laboratory flat panels have been prepared
- Successful coating of various complex shaped optical objects
- Ready for large scale testing and field evaluation
The Market Opportunity
- In 2013, a total capacity of 55.0 GWth, corresponding to 78.6million square meters of solar collectors, was installed worldwide, representing an increase in new collector installations of 1.8%compared to the year 2012.
- The breakdown of the new installed capacity in 2013 by collector type is 17.4% glazed flat-plate collectors, 79.4% evacuated tube collectors, 3.1% unglazed water collectors and 0.1% glazed and unglazed air collectors.
- The annual collector yield of all water-based solar thermal systems in operation by the end of 2013 was 314 TWh (= 1,129 PJ), corresponding to an energy savings equivalent of 33.7 million tons of oil and 109 million tons of CO2.