On 30 July 2013 15:12, YES NOPE9 wrote: > > http://www.rdmag.com/news/2013/07/best-two-worlds-solar-hydrogen-producti= on-breakthrough?et_cid=3D3394223&et_rid=3D54758454&type=3Dcta > > This sounds promising > > It seems that the only way for this to be "useful" is for it to cost far less than standard Silicon PV or to get far more efficient. ie I can use a standard PV panel now to electrolyse water to Hydrogen. Panel delivered efficiency is say 15%. If Hydrogen is the only output it is not as good as a cell where you get DC to use as desired. Gaseous Hydrogen at low pressure is a good starting point but youu need to compress it vastly to store it space efficintly and massive compression takes significant energy. Hydrogen just loves to shoot through. Storage is a pain. (A gas that leaks THROUGH steel and destroys it on the way is "unwelcome') Long go I looked at using water electrolysis to produce Hydrogen to save in gasometers for later heating use It can be done but it's more suited to low energy rate applications [Application was what to do with say 100 or 250 Watts in eg Nepal. You join a micro-Hydro power scheme on a use it or lose it basis. You buy say 250 W continuous load. Good for lighting and TV. Marginal for cokking. Tends to get wasted in daytime. Storage as Hydrogen MAY be attractive. Russell --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .