The effect of crystallinity degree of MoSe2 on the potassium ions storage performance in potassium-ion batteries (PIBs) has been largely overlooked in the energy communities. In this study, we experimentally realize MoSe2 grown on graphene nanoribbons (MoSe2-GNR) with tunable crystallinity by tailoring the thermal annealing temperature, and further investigate the effect of crystallinity degree in MoSe2-GNR on the potassium ions storage performance. The spectral, electrochemical, and microscopy experiments indicate that high-temperature thermal annealing results in a high crystallinity degree of MoSe2-GNR with decreased interlayer spacing of (002). The MoSe2-GNR with high crystallinity degree exhibits a high capacity, but suffers from reduced cycling stability. What is more, the in-situ X-ray powder diffractometer (in-situ XRD) and in-situ Raman experiments reveal the phase transition in MoSe2 triggered by potassium ions insertion/extraction during the potassium ions storage. The work sheds light on the development of MoSe2-based anode materials for PIBs.
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