Like this, for example

Artificial photosynthesis:

In the paper, the team reports the overall electrical-to-chemical power conversion efficiency of the system at 64 per cent. According to De Luna, this is the highest value ever achieved for such a system, including their previous one, which only reached 54 per cent.The new catalyst is made of nickel, iron, cobalt and phosphorus, all elements that are low-cost and pose few safety hazards. It can be synthesized at room temperature using relatively inexpensive equipment, and the team showed that it remained stable as long as they tested it, a total of 100 hours.Armed with their improved catalyst, the Sargent lab is now working to build their artificial photosynthesis system at pilot scale. The goal is to capture CO2 from flue gas -- for example, from a natural gas-burning power plant -- and use the catalytic system to efficiently convert it into liquid fuels.

In photosynthesis. the process has to 'de-orbit' two electrons to create the covalent bond.  Once the technique is perfected than batteries go away.