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Publication: Facile synthesis of SnSe2 nanoparticles supported on graphite nanosheets for improved sodium storage and hydrogen evolution

Prof. Xiaosi Zhou published his research papers in JOURNAL OF POWER SOURCES (201910,436)


SnSe2 attract enormous attention in sodium-ion batteries since it has a high theoretical specific capacity of 756 mAh g(-1). However, the large volume expansion of SnSe2 during Na+ insertion/extraction processes seriously affects the cyclic stability of SnSe2-based electrodes. Herein, 5 nm SnSe2 nanoparticles supported on the graphite nanosheets are synthesized by two-step high-energy ball milling to obtain SnSe2/graphite nanosheet nano composite. By virtue of the ultrafine SnSe2 nanoparticles and the porous carbon skeleton constructed by highly conductive graphite nanosheets, the as-obtained SnSe2/graphite nanosheet nanocomposite presents a high specific capacity of 638.6 mAh g(-1) at 200 mA g(-1), excellent rate capacity of 517.8 mAh g(-1) at 5 A g(-1), and ultralong cyclic life (252.9 mAh g(-1) after 4000 cycles at 2 A g(-1)), which are superior to the previously reported SnSe2-based composites. Ex-situ X-ray diffraction, Raman mapping, high-resolution transmission electron microscope, and X-ray photoelectron spectroscopy characterizations show that the crystal structure of SnSe2 is reversible during sodium ions insertion/extraction processes and the distribution of SnSe2 nanoparticles on graphite nanosheets remains uniform. Moreover, this nanocomposite can not only be used as a high-performance anode for sodium-ion full cells, but also as an improved electrocatalyst for hydrogen evolution reaction.