[pjreddie]

I think this is the paper:

http://pubs.rsc.org/en/content/articlepdf/2016/ta/c6ta02876d

Highly active and durable self-standing WS2/graphene hybrid catalysts for the hydrogen evolution reaction

[fudged71]

Full Text: https://sci-hub.cc/10.1039/C6TA02876D