Hydrogen is an excellent power source. But the problem is how to produce it.

"A new organic molecule coating on solar cells could lead to more efficient and cost-effective solar panels, achieving efficiencies near 31% by enhancing light management and stability. Credit: SciTechDaily.com" (ScitechDaily, Revolutionary Organic Solar Cell Coating Boosts Efficiency and Cuts Costs)

The new organic solar cells are more effective and low-cost than before. 

The silicon perovskite solar cells coated with special organic molecules that coat them to the tandem structure is a new material for more effective solar cells. There are also pyramid-shaped structures in that new solar cell that can make many things easier to handle. The new solar cells can benefit a larger spectrum scale in those new solar cells that can change everything. 

Solar cells play a key role in new types of long-enduring drone technology. They can offer a safe alternative to a radio thermoelectric generator, RTG. That thing is known as a nuclear battery. The problem is if that radioactive element goes into the wrong hands. The radioactive isotope can turn very dangerous. 

Solar cells are the tools that can produce energy for drones and cars. The system can transfer electricity straight to electric engines. But the problem is this: solar cells can produce energy only in the daytime. The nighttime. And low-light times the system needs alternative power units like fuel cells to produce electricity.  

Hybrid vehicles that can operate with hydrogen-burning combustion and electric engines need hydrogen. Hydrogen is quite an easy thing to produce using solar power. And that means cars and aircraft can produce hydrogen in their internal units if they get electricity. The new and effective solar panels are one of the solutions that can answer those challenges. 

The new types of rocket engines can use clean hydrogen. But the problem is how to produce hydrogen. 

The new types of hydrogen-powered rocket engines can use similar-looking technology that the Chinese use in their plasma engine. There can be a ball in the combustion chamber. And if hydrogen and oxygen burn around that ball. That allows the system to create a forward-pushing force. Another thing that the system can do is to inject particles into the combustion chamber. The rocket engine's problem is that it creates thrust by pushing against the front side of the combustion chamber. 

And if the fuel-oxygen mixture burns too fast, that thing pulls the pressure away from the forward of the combustion chamber. The jet engines, ramjets, and scramjets make the low-pressure area at the front of the engine. That area pulls the airplane forward. Sometimes researchers introduced acoustic and other types of systems that can make low-pressure channels at the front of the rockets and aircraft that can decrease the friction. In some introductions, the rocket can travel through an artificial tornado that rises it upwards. A sonic system can lock the sound of the rocket engine in the air whirl, created using a rotating acoustic system. 

Hydrogen is the primary fuel in new rocket, scramjet, and ramjet engines. The problem with hydrogen-burning rockets is the fast specific impulse. The forward aiming force is small because the hydrogen-oxygen mixture burins so fast. That decreases thrust. The answer could be the bubble in the combustion chamber or the system can inject water or hydrogen peroxide from the turbopumps into the combustion chamber. But hydrogen production must be made effectively. 

https://www.flyingmag.com/the-implications-of-spacexs-second-starship-test-flight/

https://scitechdaily.com/revolutionary-organic-solar-cell-coating-boosts-efficiency-and-cuts-costs/