Ulsan National Institute of Science and Technology
Abstract
School of Energy and Chemical Engineering (Energy Engineering (Battery Science and Technology))The development of efficient electrochemical catalysts for seawater batteries has been of great interest to improve its battery performance with long service life. However, the escalating charge potentials during the battery cycle erode the cell performance and remain a huge challenge. In this work, we demonstrate the sacrificial electrocatalyst of Pt nanoparticles decorated 1T-MoS2 layer triggered by carbothermal shock (CTS) treatment for improving the charge/discharge overpotential and the lifespan of the seawater battery. The simple but potent process of CTS treatment enables us to observe the phase transition of MoS2 crystal from semiconducting 2H to metallic 1T phase, resulting in improved ORR activity under seawater catholyte. In particular, the sacrificial catalyst of MoS2 during the charging process effectively reduces the charging potential due to the oxidation of MoS2, which extends the cycle stability. Furthermore, the increasing portion of 1T-MoS2 induced by the subsequent CTS process of developing Pt nanoparticles on CTS treated MoS2 exhibits a significantly low charge/discharge potential gap of ??0.39 V, a high power density of 6.56 mW cm???2, and long cycle life of up to approximately 800 hours. Thus, high throughput CTS triggered Pt decorated 1T-MoS2 offers a novel strategy for developing efficient bifunctional electrocatalysts to facilitate the long service life of seawater batteries.clos
