Optimizing Hybridization of 1T and 2H Phases in MoS<sub>2</sub> Monolayers to Improve Capacitances of Supercapacitors

<div><p>We report on a 100-fold capacitance increase in MoS<sub>2</sub>-based supercapacitors achieved via optimizing the in-plane 1T-2H phase hybridization of the monolayers. Chemically exfoliated MoS<sub>2</sub> monolayers were annealed at low temperature to tune their 1T content from 2% to 60%. The obtained hybridization states were confirmed by X-ray photoelectron and Raman spectroscopies. After optimizing the hybridization degree, the electrode based on MoS<sub>2</sub> monolayers with 40% of the 1T phase exhibited outstanding performance with a resistance as low as 0.68 kΩ sq<sup>−1</sup>, specific capacitance of 366.9 F g<sup>−1</sup>, and retention ratio of 92.2% after 1000 cycles at current densities of 0.5 A g<sup>−1</sup>.</p></div>