Rationally Designed Mn₂O₃–ZnMn₂O₄ Hollow Heterostructures from Metal–Organic Frameworks for Stable Zn‐Ion Storage

Abstract

Mn-based oxides have sparked extensive scientific interest for aqueous Zn-ion batteries due to the rich abundance, plentiful oxidation states,a nd high output voltage.H owever, the further development of Mn-based oxides is severely hindered by the rapid capacity decayd uring cycling. Herein, atwo-step metal-organic framework (MOF)-engaged templating strategy has been developed to rationally synthesize heterostructured Mn 2 O 3 -ZnMn 2 O 4 hollowo ctahedrons (MO-ZMO HOs) for stable zinc ion storage.T he distinctive composition and hollowh eterostructure endowM O-ZMO HOs with abundant active sites,enhanced electric conductivity, and superior structural stability.Byvirtue of these advantages, the MO-ZMO HOs electrode shows high reversible capacity, impressive rate performance,and outstanding electrochemical stability.Furthermore,exsitu characterizations reveal that the charge storage of MO-ZMO HOs mainly originates from the highly reversible Zn 2+ insertion/extraction reactions.

Formation of CuMn Prussian Blue Analog Double‐Shelled Nanoboxes Toward Long‐Life Zn‐ion Batteries

“…The capacity contributions from the capacitive and diffusion behaviors can be determined by the formula: i = a v b , where the values of a and b are adjustable constants. [43,44] By fitting the plots of log(i) versus log(v), the calculated b values of the peaks 1-4 are 0.86, 0.71, 0.65, and 0.86, respectively, demonstrating that the reactions at these peaks are synergistically controlled by capacitive and ionic diffusion behaviors (Figure S17b, Supporting Information). [45] Furthermore, the capacitive contribution at a certain scan rate is evaluated.…”

Layered Structures of Enriched V5+ States of Vanadium Oxide as a Hybrid Cathode Material for Long-Cyclable Aqueous Zinc-Ion Batteries

“…In such a situation, aqueous zincion batteries were developed as a suitable candidate compared to traditional LIBs as a result of their excellent theoretical capacity (820 mAh g −1 ), high redox potential (−0.76 vs SHE), low cost due to their raw material abundance, and ecofriendly nature. 2 Wang et al were the first to introduce AZIBs; then, slowly, different potential cathode materials such as vanadiumbased oxides, manganese-based oxides, and Prussian blue analogues were developed and tested for AZIB application. 3,4 The poor structural stability of Mn-based oxides and the low specific capacity of Prussian blue analogues restricted their further development.…”

W-doped VO2 for high-performance aqueous Zn-ion batteries

“…14,15 To modify these properties, many strategies have been developed. [16][17][18][19][20][21][22][23][24][25] Among numerous strategies, metal element doping has been demonstrated to be an effective method. Wolfram atoms have a similar radius to vanadium and a high valence value, so they not only replace V atoms easily but also weaken the electrostatic interaction between the Zn 2+ and O 2À in VO 2 .…”