Instead of wasting $$trillions on "green" scams, let's fund something that might actually produce energy-----Making hydrogen fuel from water and visible light at 100 times higher efficiency

Making hydrogen fuel from water and visible light at 100 times higher efficiency | KurzweilAI:

They report in Journal of Physical Chemistry that by absorbing the entire visible light spectrum, they have increased the yield and energy efficiency of creating hydrogen fuel by up to two magnitudes (100 times) greater than previously reported.**

As described in the paper, they used three new techniques to achieve that:

• “Black titanium dioxide” (with 1 percent platinum) on a silicon dioxide substrate;
• A “light-diffuse-reflected surface” to trap light;
• An elevated reaction temperature (280 degrees Celsius).

In addition, the new setup is “convenient for scaling up commercially,” said Ho.

* TiO2 has a relatively large band gap energy (3.0−3.2 eV) and thus it can absorb only ultraviolet (UV) light (about 4% of the total solar energy), leading to a low photoconversion efficiency (less than 2% under AM 1.5 global sunlight illumination).

** The new method achieves a photo hydrogen yield of 497 mmol/h/g and an apparent quantum efficiency of 65.7% for the entire visible light range at 280 °C.