But "molecular energy storage" and hydrogen (solid or otherwise) are not battery technologies. They are better classified as fuels which store (chemical) energy

But "molecular energy storage" and hydrogen (solid or otherwise) are not battery technologies. They are better classified as fuels which store (chemical) energy in chemical bonds, which is distinct from batteries which store (electrical) energy by charge separation. I agree with the article author. I was convinced after reading chemistry professor Daniel Nocera a few years ago, after he became famous for discovering a cobalt-phosphate water-splitting catalyst, for the first time enabling hydrogen generation under normal conditions (neutral pH). He had been looking for it for some time (his "holy grail" of renewable energy). He's a proponent of solar and hydrogen (collecting energy from solar and storing it in hydrogen) and a detractor of batteries. He (convincingly) argues that battery tech is fundamentally limited by the physics of charge separation. The only way to beat that limit is to store the energy in chemical bonds - as fuel - like nature does. His paper "Chemistry of Personalized Solar Energy" is a good place to start.[1] Just the introduction and conclusion - you can skip the middle (its dense orbital theory). 1. http://www.tarleton.edu/Faculty/alow/solar2.pdf http://www.tarleton.edu/Faculty/alow/solar2.pdf