Interesting research taking place at the Indian Institute of Science Education and Research (IISER) in Pune, India, shared by the IEEE Spectrum blog. The creation of a photo battery "where the anode itself is made of titanium nitride and ambient light":
...Under artificial light, this prototype battery has a capacity of 77.8 mAh/g. It’ll quite happily power a small fan or LED light for about 30 seconds, and then if you give it a break for 30 seconds while shining a light on it, it’ll be all charged up and good to go again. Over 100 cycles, the battery retained a bit over 70 percent of its discharge capacity, which at least suggests some potential for longevity and usefulness.
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