Strongly coupled MoS2–3D graphene materials for ultrafast charge slow discharge LIBs and water splitting applications

Li-ion batteries (LIBs) with ultrafast charge and slow/fast discharge capability are highly desirable. Meanwhile, sustainable hydrogen produced by water splitting with high efficiency and low cost is another technique of great interest to industry. In this paper, we proposed to apply strongly coupled MoS2–3D graphene hybrid (MoS2@GF) with freestanding receptaculum nelumbinis-like (RNL) structure both as a binderfree electrode for LIBs and as a catalyst for high efficient water splitting application. The hybrid (RNL MoS2@GF) based electrodes of LIBs showed ultrafast charging and slow discharging capability (The 60s-charging LIB could discharge as long as 3000 s) and excellent cycle stability (the specific capacity had almost no change after 100 cycles). More importantly, the binderfree RNL MoS2@GF as water-splitting catalyst exhibited high activity and superior stability for hydrogen-evolution reaction in acidic solutions, which lasted more than 200 h without any decay, with a current of 160 mA cm−2 at an overpotential of 350 mV.

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