Electrolyzer

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Hydrogen Generator

Separating Generator

  • Diagram of system - [1]. Paper has info contacts at NREL, and comparison of PEM to alkaline.
  • alkaline electrolyzer stack - price not shown - [2]
  • 200 cc/min at 3-8 bar - $9k - [3]. With 1440 minutes/day - or 0.3 cu meter per day [4].
  • 1000 cc/min - $3280 - for 1000 ml/min - 1.4 cu meter/day. Alkaline, 4 bar. That is 130 grams of hydrogen per day. [5]
    • Redo the same - and 10x lower cost.
    • Need 3 hours of Honda EU1000 generator - or 2.7 kWhr.
  • 500 cc/min - $700 - [6]
    • x5 = $3500 for 2500 cc/min or 3.5 cu m per day (about 1000 gal propane tank with no compression (thus 500 gal at 4 bar can handle 2 days worth of generation), but if it is solar generation, that is 8 days of storage)) [7]. Or 290 grams per day.
  • Power extraction - If 0.6 gal used for 7 hours at 1/4 power with Honda EU1000 - the gen set can do 7 hours at 200W. Or 1.4 kWhr. It advertises 3.2 hours at full power - or nearly 3 kW. Note that 3.2 hours at rated load of 900W - nearly 3 kWhr - on 0.6 gal gas. So it's more efficient to run at full power, which wastes less energy due to 'reciprocating pump loss'.
  • Bottom line - 290 grams per day of hydrogen - less than 1/3 kg equivalent - means about one half the 0.6 kg (0.55 gal [8]) equivalent tank of the Honda EU1000. Thus, we get a power of about 1.5 kWhr from the daily generation of hydrogen using a Honda1000EU generator at full power. Not bad. That is marginal full power storage from an eco-home with smart energy. If designed for smart energy use, then this solar hydrogen route could be completely viable. Using $3500 in hydrogen generation. For storage in a Propane Tank - bottom line is
  • Zirfon PERL is common electrolyzer separator material - [9]. It is a polysulfone (3D printable) and 85% ZrO2 nanoparticles blend. ZrO2 - [10]
  • Both stainless steel and nickel work as electrodes - [11]
  • Alkaline Electrolyzer Design

DIY Separating

  • thediyscienceguy@gmail.com - [12]

Mixing Generator

  • $200 for 6 lpm - but this is HHO, not H + 0
  • Graphite plates work well - [13]
  • Wet vs dry cell design - [14]

Summary

  • 500 cc/min = 0.7 cu m / day [15]
  • 0.7 cu m = 0.06 kg. [16]
  • This means 5 of these give 0.3 kg/day - at a cost of $3100 of equipment
  • Off-the-shelf - 1 kg/day of hydrogen costs $10k.
  • Compare to the Spicer Electrolyzer - which can likely be produced for $100 per cell - and $3k per 1kg/day capacity. At scale, the Spicer system can likely be much more cheap.
  • This is worth pursuing today.