I did not research this, but as normally H2S acts as a reducing agent, the answer is most likely there is nothing that will reduce it to H2. However, if pressed to be creative, the only thing that comes to mind that could even possibly reduce H2S would be so-called nascent H2. From a theoretical point, it may be interesting to treat H2S with H* which must be created in situ. One possible embodiment, add ZnS and Zn to conc HCl. Reactions:

Zn + 2 HCl --> ZnCl2 + 2 H*

ZnS + 2 HCl --> ZnCl2 + H2S

2 H* + H2S --?--> 2 H2 + S

Net, one pot reaction:

Zn + ZnS + 4 HCl --> 2 ZnCl2 + 2 H2 + S

Now, the last reaction is completely specualtive, but if it did occur, it would be quite interesting as well. Also, the creation (existence) of nascent H2, by itself, is disputed in the case of the Zn/HCl reaction (critics claiming other possible paths).

Note, H2S is quite toxic and anyone daring to try to do this, may consider using an expandable closed vessel performing a small scale reaction. If a sulfur suspension resuts, success.

[EDIT] Another idea, pass H2S over heated Ag or Ni...just not an oxide. Reaction:

H2S + Ag --> AgS + H2 (g)

Double Post deleted.

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Continuing with my ideas to change H2S into H2, the best metal may be just heated Iron (cheap) in limited oxygen:

H2S + Fe --> FeS + H2 (g)

Then use a special bacteria to convert the FeS slowly to FeSO4 as a useful side product for sale. Also, an unwanted reaction, hopefully to a lesser extent depending on O2 access and temperature:

H2S + FeO --> H2O + FeS
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Also, on the mystical nascent H2 approach, other possible reactions as well:

ZnCl2 + H2S --> ZnS (s) + 2 HCl (g)

That is, the H2S could reduce some of the newly formed ZnCl2 (back to ZnS) if HCl vapors can exit the reaction. This could negate experimental results (less H2S because of ZnCl2 formation and exiting HCl). To prevent this, use an excess of HCl and do not boil.

Also, on rethinking, the reaction:

2 H* + H2S --?--> 2 H2 + S

is more likely (but still less likely) with atomic hydrogen, and not nascent hydrogen as:

H2 --Electric Discharge--> H* + H*

that is, atomic hydrogen is indeed mono-atomic, but not so for nascent hydrogen (I fell victim to misleading notation, better perhaps is H2* for nascent H2).

Deleted double post.