Comparative Study in Acidic and Alkaline Media of the Effects of pH and Crystallinity on the Hydrogen-Evolution Reaction on MoS2 and MoSe2
By Wiensch, Joshua D.; John, Jimmy; Velazquez, Jesus M.; Torelli, Daniel A.; Pieterick, Adam P.; McDowell, Matthew T.; Sun, Ke; Zhao, Xinghao; Brunschwig, Bruce S.; Lewis, Nathan S.
Published in ACS Energy Letters
Abstract
Single crystals of n-type MoS2 and n-MoSe2 showed higher electrocatalytic activity for the evolution of H2(g) in alkaline solutions than in acidic solutions. The overpotentials required to drive hydrogen evolution at ?10 mA cm