Hyoung, Jooeun. (2019-03). Electrochemical Exchange Reaction Mechanism and the Role of Additive Water to Stabilize the Structure of VOPO 4 ⋅2 H 2 O as a Cathode Material for Potassium-Ion Batteries. ChemSusChem, 12(5), 1069–1075. doi: 10.1002/cssc.201802527