De or het waterstoftechnologie?

The correct Dutch article is:

de waterstoftechnologie

Rule Words ending in -logie: always de. See the rule

How to use waterstoftechnologie

the waterstoftechnologiede waterstoftechnologie
this waterstoftechnologiedeze waterstoftechnologie
that waterstoftechnologiedie waterstoftechnologie
our waterstoftechnologieonze waterstoftechnologie
your waterstoftechnologiejouw waterstoftechnologie
every waterstoftechnologieelke waterstoftechnologie
which waterstoftechnologie?welke waterstoftechnologie?
a big waterstoftechnologie / the big waterstoftechnologieeen grote waterstoftechnologie, de grote waterstoftechnologie