Bilateral Interfaces in In₂Se₃-CoIn₂-CoSe₂ Heterostructures for High-Rate Reversible Sodium Storage

Abstract

Metal selenides are considered as a group of promising candidates as the anode material for sodium-ion batteries due to their high theoretical capacity. However, the intrinsically low electrical and ionic conductivities as well as huge volume change during the charge-discharge process give rise to an inferior sodium storage capability, which severely hinders their practical application. Herein, we fabricated In2Se3/CoSe2 hollow nanorods composed of In2Se3/​CoIn2/​CoSe2 by growing cobalt-based zeolitic imidazolate framework ZIF-67 on the surface of indium-based metal–organic framework MIL-68, followed by in situ gaseous selenization. Because of the CoIn2 alloy phase in between In2Se3 and CoSe2, a heterostructure consisting of two alloy/selenide interfaces has been successfully constructed, offering synergistically enhanced electrical conductivity, Na diffusion process, and structural stability, in comparison to the single CoIn2-free interface with only two metal selenides. As expected, this nanoconstruction delivers a high reversible capacity of 297.5 and 205.5 mAh g–1 at 5 and 10 A g–1 after 2000 cycles, respectively, and a superior rate performance of 371.6 mAh g–1 at even 20 A g–1.

Dual‐Design of Nanoporous to Compact Interface via Atomic/Molecular Layer Deposition Enabling a Long‐Life Silicon Anode

“…The correlation of the peak current ( i ) and the scan rate ( v ) obeys the power law of i = av b (2), where b = 0.5 implies diffusion‐controlled behavior, b = 1 represents surface‐controlled capacitive‐type behavior. [ 29 ] In our case, the b‐values corresponding to different peaks for Si@titanicone/TiO 2 and the Si@zincone/TiO 2 are presented in Figures S13b and S14b, Supporting Information. These values are between 0.68 and 0.73 and thus indicate a mixed process controlled by both diffusion and surface mechanism.…”

Nitrogen-doped hollow carbon nanoboxes in zwitterionic polymer hydrogel electrolyte for superior quasi-solid-state zinc-ion hybrid supercapacitors

“…10,16 It should be emphasized that the hollow structure with crystalline microdomains is probably caused by the Kirkendall effect-induced hollowing and catalytic effect of ZIF-67 under the pyrolysis treatment. 31,32 The selected-area electron diffraction (SAED) pattern (the inset in Fig. 1f) further indicates the amorphous-dominated structure of APZC.…”

A multi-interface CoNi-SP/C heterostructure for quasi-solid-state hybrid supercapacitors with a graphene oxide-containing hydrogel electrolyte

“…The reduced capacity attenuation and high rate performance of CoNi-SP/C would be attributed to the complex interdependence of sufficient accessible redox sites, abundant channels for ion transport from the hollow porous configuration, the accelerated charge transfer due to the improved electronic structure originating from the metalloid-like phosphide and polyphase interfaces, and the synergistic effect of the multicomponent. 14,17,47 It is worth mentioning that the capacity degradation with the increase of the current density may be caused by the limited reaction dynamics because of the shorter ion diffusion time at high current densities. 48 The subsequent cycling tests were carried out to prove good stability of the hollow porous CoNi-SP/C heterostructure.…”

“…The maximized performance of CoNi-SP/C can be ascribed to the synergistically interplayed effect of the metalloid-like NiCoP phase with high covalent properties, multicomponent with polyphase interfaces, and full use of active species offered by the favorable morphology and hierarchical porosity, which effectively accelerate the interfacial faradaic reactions. 47,53,57 In addition, the MOF-derived carbon matrix within CoNi-SP/C enables delivery of enhanced performance in energy storage compared to MOF materials. 39…”