How are they claiming 200w/ meter^2?

That seems like an utterly fanciful figure for kinetic harvesting, and AFAIK the droplet charge also wouldn’t be enough? What am I missing here?

“The peak power output of the bridge array generators is nearly 5 times higher than that of the conventional large-area raindrop energy with the same size, reaching 200 watts per square meter,” Li explained, “which fully shows its advantages in large-area raindrop energy harvesting.”