{Highly|Extremely|Very|Hugely} {Durable|Tough|Sturdy} Graphene Monolayer Electrode on Insulating Substrate {under|below|beneath} Long-term Hydrogen Evolution Cycling

Electrochemical hydrogen evolution reaction (HER) at single graphene sheets has been investigated {widely|extensively|broadly} either in its pristine {form|type|kind} or {after|following|right after|soon after|immediately after|just after} chemical modification. {One|1|A single|One particular} {important|essential|crucial|critical|significant|vital}…