Having seen too many such announcements about promising green technologies, I tend to ask a few questions when seeing something like this. One of them is what state a technology is in (early research, announcement, small prototype, industrial scale prototype).

It is not really clear from the article what the scale and state of this technology is, but at least from the pictures this looks like small and very early stages. It's of course a good thing to do early research, but already pitching that with claims about it being "cheap" sounds dishonest if you're far away from a working, industrial-scale prototype.