Constructing MoO3@MoO2 heterojunction on g-C3N4 nanosheets with advanced Li-ion storage ability.

Because of multi-valence state of molybdenum (Mo), MoO 3 @MoO 2 heterojunction anchored on two dimensional (2D) g-C 3 N 4 nanosheets is created by calcining ammonium heptamolybdate with urea in a muffle furnace. The 2D porous structure of g-C 3 N 4 provides abundant active sites for lithium-ion storage, and it helps enhance the electrical conductivity and relieve large volume expansion effect during the discharge/charge process. The MoO 3 @MoO 2 heterojunction can accelerate the Li+/e- transfer, further improving sluggish charge transport kinetics and supplying high pseudocapacitive. Therefore, the resulting MoO 3 @MoO 2 heterojunction on g-C 3 N 4 electrode delivers a high capacity of 992 mAh g−1 0.5 A g−1 after 100 cycles and excellent rate performance. It still shows stable cycling performance when assembled into a full lithium-ion battery. • MoO 3 @MoO 2 heterojunction are anchored on two dimensional g-C 3 N 4. • g-C 3 N 4 provides abundant active sites and relieves large volume expansion effect. • MoO 3 @MoO 2 heterojunction could accelerate the Li+/e– transfer. • MoOx-UCN electrode shows excellent lithium-ion storage and rate performance. [ABSTRACT FROM AUTHOR]