Two-dimensional metal sulfides/selenides with high theoretical capacity and unique layered structure have been extensively studied as anode materials for sodium-ion batteries (SIBs). However, they generally suffer from low conductivity and large volume expansion during charging-discharging process, which in turn significantly limiting the sodium storage performance. In this work, a MoS 2 -MoSe 2 heterostructure has been epitaxially grown onto the Escherichia coli (EC)-derived carbon scaffold via a facile hydrothermal reaction regulated by carbon dot and post-selenization process. By virtue of the superior conductive network and excellent structural stability enabled by the dual carbon incorporation, the newly-designed CD-MoSe 2 -MoS 2 /EC electrode demonstrates a high reversible specific capacity of 450.5 mAh g -1 at a current density of 100 mA g -1 and outstanding rate capability, maintaining 284 mAh g -1 at a high current density of 2000 mA g -1 , used as an anode for SIBs. Moreover, ex/in situ characterizations and first-principle calculation results unveil that the constructed MoS 2 /MoSe 2 heterostructure effectively increases active sites and enhances the ion adsorption capacity, while the expanded interlayer spacing of MoS 2 further accelerates ion diffusion. This work provides a feasible design strategy for developing sustainable, low-cost, and high-performance electrode materials for next-generation sodium-ion storage.
Yan et al. (Fri,) studied this question.
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