2H -> 1T Phase Change in Direct Synthesis of WS2 Nanosheets via Solution-Based Electrochemical Exfoliation and Their Catalytic Properties Shi Xuan Leong, Carmen C. Mayorga-Martinez, Xinyi Chia, Jan Luxa, Zdeněk Sofer, Martin Pumera* ACS Applied Materials & Interfaces 2017, 9(31), 26350-26356