ELECTRODE SPECIFICATION
WIND CYCLING100-Hour Wind Cycling Test
Wind-speed variation data over 100 hours converted to a current-density schedule (0 to 0.78 A/cm2) and applied to our bifunctional NiCo electrode in an AEM cell with a commercial Zirfon separator. ΔV before/after LSV at 0.5 A/cm2: 20 mV.
WIND CYCLING
TESTBEDThis spec
WIND CYCLING
HER overpotential
@ 100 mA/cm² (no IR)
OER overpotential
@ 100 mA/cm² (no IR)
Cell @ 0.5 A/cm² / 60 °C
91.4% efficiency
1000-hour drift
@ 0.5 A/cm² / 40 °C
How the wind-coupled test was performed
Real-world wind-speed variation data was sampled over 100 hours and converted into a current-density schedule for the electrolyzer. The schedule spans 0 to 0.78 A/cm2 with rapid gusts and sustained troughs.
The schedule was applied to a 5 cm2 AEM cell with our bifunctional NiCo electrode on both sides and a commercial Zirfon separator (500 um) at 40 deg C in 30 wt% KOH. The cell was operated continuously for 100 hours.
- Source: wind-speed variation data, 100 hours
- Conversion: wind speed to electrolyzer current density
- Range: 0 to 0.78 A/cm2
- Duration: 100 continuous hours
- Cell: 5 cm2 AEM, zero-gap, 30 wt% KOH, 40 deg C
- Components: bifunctional NiCo electrode (both sides), commercial Zirfon separator (500 um)
Run duration
Current-density range
ΔV before/after at 0.5 A/cm2
Result
Linear-sweep polarization curves were recorded before the 100-hour wind-cycling run and after. The two curves differ by only 20 mV at the 0.5 A/cm2 operating point. The polarization curves overlap closely across the full current-density range.
The bifunctional NiCo electrode and commercial Zirfon separator held their operating envelope under 100 hours of wind-derived rapid transients.
Why wind transients are harder than solar cycles
Wind variability is faster and less predictable than solar daily cycles. A wind-coupled electrolyzer can see large step changes in current density within minutes. The 100-hour wind run exercises the cell across that envelope continuously. The 20 mV difference between before- and after- LSV demonstrates the electrode held its operating point across the dynamic exposure.
Where this specification matters
Industrial applications where wind dynamic load (100-hour continuous) is a primary qualification metric.
Frequently asked questions
How is dynamic-load tolerance characterized?
Real PV irradiance (9 days) or wind variation (100 hours) was sampled and converted into a current-density schedule applied to the AEM cell with bifunctional NiCo electrode and commercial Zirfon separator. The 9-day solar run showed no major changes; the 100-hour wind run produced ΔV = 20 mV at 0.5 A/cm² before/after LSV.
How is wind dynamic load (100-hour continuous) measured?
All published values were measured in a 5 cm² AEM cell with our bifunctional NiCo electrode on both sides, 30 wt% KOH electrolyte, zero-gap assembly, and a commercial Zirfon separator (500 µm) as the membrane reference. Overpotentials are reported without IR correction.
Can I reproduce this number on my own cell?
Yes. Bench-scale 5 cm² coupons matching the size used in our published AEM test cell are available. Reproducing the cell conditions (30 wt% KOH, zero-gap, commercial Zirfon separator, bifunctional NiCo electrode on both sides) lets a customer team confirm the published number directly.
What substrate sizes can I order?
We produce the bifunctional NiCo electrode on Ni foam in the 100 to 1000 cm² size range. Bench-scale coupons and pilot-scale electrodes both ship from this same product line. Specific sizes can be discussed for OEM stack integration.
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