There may not be any particular case studies accessible for nanotech-enabled green hydrogen initiatives as of December 2023, when we last updated our understanding. But since green hydrogen and nanotechnology are such dynamic fields, it is probable that more advancements have happened since then. Here are some broad instances and ideas that, at the time of my most recent update, were pertinent (39-42).1
This is an unusual case, very similar in meaning to the usual “As of my last knowledge update in December 2023” etc., but not with quite the same verbiage, at least in the first quoted sentence. The phrase “as of December 2023, when we last updated our understanding” may be an attempt to make the AI-generated language seem more natural. If so, the switch to the first-person singular in the second quoted sentence was apparently missed.