Metal–Organic Framework-Derived ZnSe- and Co_0.85Se-Filled Porous Nitrogen-Doped Carbon Nanocubes Interconnected by Reduced Graphene Oxide for Sodium-Ion Battery Anodes

Abstract

Transition-metal selenides have been considered as one of the most promising anode materials for sodium-ion batteries (SIBs) due to their high theoretical capacity and excellent rate performance. However, rapid capacity decay and poor cycling stability limit their practical application as the anode for SIBs. Carbon coating is one of the most effective ways to solve the above problems, but the thickness and uniformity of the coating layer are difficult to control. Herein, we successfully synthesize metal−organic framework (MOF)-derived porous N-doped carbon nanocubes homogeneously filled with ZnSe and Co 0.85 Se and interconnected by reduced graphene oxide (ZCS@NC@rGO). ZCS@NC@rGO with more active sites and the synergistic effect of the ZnSe and Co 0.85 Se heterojunction can enhance the sodium storage performance. The porous carbon nanocubes effectively prevent the agglomeration of active particles, and the rGO acting as a carbon network can significantly buffer the inevitable volume changes. At the same time, carbon nanocubes and the rGO are interconnecting to form a conductive network to accelerate electron transfer. Based on the aforementioned advantages, the ZCS@NC@rGO electrode shows an excellent sodium storage performance. Our investigation opens up a new horizon for the rational design of transition-metal selenide anodes for SIBs with a unique structure.

Constructing SnO2–MoSe2heterojunction nanoflowers as high-rate and ultrastable anodes for sodium-ion half/full batteries

“…3f displays that the rate capability of SnO 2 /MoSe 2 is superior to most previously reported studies. 18,27–33 Fig. 3g compares the long-term cycle performance of SnO 2 /MoSe 2 , SnO 2 and MoSe 2 at 10 A g −1 ; the SnO 2 /MoSe 2 heterojunction electrode still maintains a promising discharge capacity of 364.3 mA h g −1 after 5000 cycles, while MoSe 2 and SnO 2 only stop after 1000 and 200 cycles, respectively.…”

“…3f displays that the rate capability of SnO 2 /MoSe 2 is superior to most previously reported studies. 18,[27][28][29][30][31][32][33] initial few cycles. It further conrms that the heterojunction can effectively enhance the stability of the structure.…”

Construction of bimetallic ZnSe–CoSe 2 flower as a finely tuned electrode for enhancing supercapacitor performance

“…The prologue of agglomerated CoSe 2 microcubes into ZnSe pyramidal structure and synergetic effect of the individual component comprises multifunctionalities during redox progression attributable to greater structural potency. 31 Therefore, the flower-like nanoarchitecture have unique configuration favorable for ionic adsorptions, chiefly limiting the diffusion pathway, and having noteworthy ability to buffer the volume expansion during long cycling. 32 TEM was employed to get apparent insight of ZnSe-CoSe 2 heterostructures.…”

“…Accordingly, the flower‐like heterostructure embedded with microcubes emanating from the center present the unique growth pattern of flower (Figure 4E,F). The prologue of agglomerated CoSe 2 microcubes into ZnSe pyramidal structure and synergetic effect of the individual component comprises multifunctionalities during redox progression attributable to greater structural potency 31 . Therefore, the flower‐like nanoarchitecture have unique configuration favorable for ionic adsorptions, chiefly limiting the diffusion pathway, and having noteworthy ability to buffer the volume expansion during long cycling 32 …”

Research progress on ZnSe and ZnTe anodes for rechargeable batteries

“…Further construction of bimetallic selenides via cation-exchange for ZnSe/Sb 2 Se 3 @NC hollow microspheres, for example, could enhance the Na + ion storage capability and the cycling performance. 120 Some similar works have been published in recent years; these typical structures/composites include ZnSe/CeO 2 /RGO, 89 2D CuGaSe 2 @ZnSe-NC, 65 core–shell or yolk–shell ZnSe/CoSe/@NC or ZnSe/CoSe 2 @NC nanobox/polyhedra, 69,121–123 Fe 3 Se 4 /ZnSe@NC nanospheres and nanocubes, 105,124 CoSe 2 /ZnSe@C nanoparticles, 125 ZnSe/Sb 2 Se 3 @NC hollow microspheres, 120 heterojunction nanoparticles embedded in carbon nanofibers/nanorods (Cu 2 Se-ZnSe-CNFs, porous ZnSe/CoSe 2 /C, ZnSe/Co 0.85 Se@NC@C), 126–128 ZnSe⊂N-C@MoSe 2 /rGO, 55 ZnSe/Co 0.85 Se@NC@rGO, 129 2D CoSe 2 /ZnSe@NC hybrid, 86 and 3D or hierarchical CoSe 2 /ZnSe@NC hybrids etc . 90…”