↙️MAHLE Powertrain hydrogen internal combustion engine #H2ICE conversion on 13L heavy duty diesel engine. Likely uses #H2 as reductant for SCR exhaust NOx cleanup.

↘️I have US Patent 6981367 ( #Giner & #GM ) for electrolyzing #hydrogen gas from H2O vapor in diesel ICE exhaust for SCR of NOx.

↘️↘️And here's an old photo of the Giner vapor phase water electrolyzer fouling test hardware at the GM test lab in Warren, MI.