Thermophotovoltaic cell (TVP). And electricity-creating bacteria can be the power sources of the future.

Image 1) "A thermophotovoltaic (TPV) cell (size 1 cm x 1 cm) mounted on a heat sink designed to measure the TPV cell efficiency. 

To measure efficiency.  That cell is exposed to an emitter, and simultaneous measurements of electric power and heat flow through the device are taken. Credit: Felice Frankel"(SciTech Daily/ New Heat Engine With No Moving Parts Could Fully Decarbonize the Power Grid)

 The new thermophotovoltaic cell (TVP) makes energy from the intensive heat. 

The TVP or thermophotovoltaic cell can form electricity from bright light. Or actually, the system makes high-energy photons that are sent to the silicon layer. The system needs 1900 to 2400 degrees celsius for creating an energy level, high enough for making electricity from high-energy photons. 

The TVP cells are interesting tools. They are acting like regular photovoltaic cells or solar panels. And if the researchers can create the spider net by using hollow transparent nanotubes with an extremely bright light that uses some gas like acetylene or methane for making the light. 

That thing can use to make the system that allows solar panels can create energy in the dark and nighttime. The TVP cells can use for making solar power drones that can operate at night time. And those TVP systems can also use for making deep-space probes that can operate far away from the sun without nuclear energy.

The system can use the methane-creating batteries and the carbon removing systems for removing carbon from the carbon dioxide. Then the methane can use in the light that creates high-energy photons for the TVP cells. 

Image 2) "Artist’s concept of microbial energy generation". (SciTech Daily/Bacteria Generate Electricity From Methane: Generating Power While Purifying the Environment of Greenhouse Gases)

The electricity creating bacteria can use also for energy supply to the robots. 

Bacteria that use methane for nutrients and make electricity can give energy for the large entireties. The system needs only rotten waste for making methane. That bacteria use for making electricity. But genetic engineering is making that kind of system more powerful. 

The bacteria that is creating electricity is an interesting idea. By using the bacteria cultures are possible to create even the high-voltage systems. By using genetic engineering is possible to hybridize those electric creating bacteria with the cells that create electricity for electric eel. Those cells can create over 800 volts of electrical voltage. 

If those bacteria are in the cell cultures they can use for creating the high-voltage biological power units. Those biological batteries can be connected side by side and in a series. Just like normal chemical batteries. There is the possibility that those cell cultures are in the bird's feather-like structure. 

Image 3) "A depiction of a Phoenix by Friedrich Justin Bertuch, 1806" (https://en.wikipedia.org/wiki/Phoenix_(mythology))

Maybe some futuristic robots are like Phoenix from mythology. 

The idea for the robot bird whose feathers are the power supply units for the computers and other systems is taken from the myth of the Phoenix Bird mythology. Sometimes some engineers suggested that the Phoenix Bird is the Von Neumann machine that creates a copy of itself. The feathers of that robot would be the bacteria cultures that are delivering energy for that machine. Those cells can use the algae for nutrients. And that means those futuristic robots can use vegetable fertilizer as a nutrient. 

Where in the side channels are the places where bacteria live. And in the middle of that thing is the central electric wire that transfers electricity to the main system. The side and serially connected batteries can reconnect to the bigger entireties. And in the biological batteries, the power supply will make by using biological components like bacteria that create electricity. 

That system requires nutrients and there is the possibility that tomorrow's robots eat the same food as people. They need the artificial stomach where food is turned into nutrients for those electric creating bacterial. 

Sources. 

https://scitechdaily.com/bacteria-generate-electricity-from-methane-generating-power-while-purifying-the-environment-of-greenhouse-gases/

https://scitechdaily.com/new-heat-engine-with-no-moving-parts-could-fully-decarbonize-the-power-grid/

https://en.wikipedia.org/wiki/Phoenix_(mythology)