years ago, but until last month I hadn't seen his papers posted on Rex research where it points out you need a piezo source to get the crystals humming. Silicon Dioxide was one than could then be coated with zinc oxide crystals will split water with waste heat or vibration.
Zinc Oxide you say, Huifang Xu has an interesting piezoelectrochemica effect. I found one preparation on Overunity https://overunity.com/10388/practical-method-for-production-of-water-fuel-with-piezoelectric/
years ago, but until last month I hadn't seen his papers posted on Rex research where it points out you need a piezo source to get the crystals humming. Silicon Dioxide was one than could then be coated with zinc oxide crystals will split water with waste heat or vibration.
http://www.rexresearch.com/xu/xu.htm