I wonder why there is not more talk and research of other liquid fuels that are not as dangerous and inefficient as hydrogen gas. Example: Methanol or ethanol

I wonder why there is not more talk and research of other liquid fuels that are not as dangerous and inefficient as hydrogen gas. Example: Methanol or ethanol for flow batteries. https://www.purdue.edu/newsroom/releases/2017/Q2/instantly-rechargeable-battery-could-change-the-future-of-electric-and-hybrid-automobiles.html https://www.purdue.edu/newsroom/releases/2017/Q2/instantly-r...