Activated Proton Storage in Molybdenum Selenide through Electronegativity Regulation

Abstract

Layered transition metal dichalcogenides (TMDs) are promising candidates for aqueous zinc-based batteries owing to the large interlayer distance. Nevertheless, the low specific capacity of unmodified TMDs due to the high binding energy between host materials and carriers in electrolytes hinder their further development. Herein, a simple method to incorporate oxygen is reported to enhance the specific capacity of MoSe 2 . The in situ and ex situ characterization results confirm that the oxygen incorporated MoSe 2 experiences proton-dominated insertion electrochemistry during cycling. In addition, the theoretical calculation results demonstrate that the oxygen atoms with high electronegativity can effectively reduce the binding energy of adsorbing H + and change charge distribution in the interlayer. As a result, incorporating oxygen significantly promotes H + adsorption and diffusion, and thus greatly increases the specific capacity of MoSe 2 . This study provides an effective strategy to facilitate the kinetics of TMDs, and thus achieve highperformance aqueous zinc-based batteries.

Stabilizing layered superlattice MoSe2 anodes by the rational solvation structure design for low‐temperature aqueous zinc‐ion batteries

“…In Figure 1E, only a single 2H phase in pure MoSe 2 , and the peaks of Mo 3d 3/2 and Mo 3d 5/2 at 229.9 and 226.8 eV can be assigned to Mo 4+ , respectively. 21,22 Different from pure MoSe 2 , the Mo 3d spectra with a distinctive shape for p-MoSe 2 could be clearly split into 1T and 2H phases. The Se 3d spectra of p-MoSe 2 also can be transformed into hybrid phases quantitatively in Figure 1F.…”

“…The hybrid phases were also measured by X‐ray photoelectron spectroscopy (XPS). In Figure 1E, only a single 2H phase in pure MoSe 2 , and the peaks of Mo 3d 3/2 and Mo 3d 5/2 at 229.9 and 226.8 eV can be assigned to Mo 4+ , respectively 21,22 . Different from pure MoSe 2 , the Mo 3d spectra with a distinctive shape for p‐MoSe 2 could be clearly split into 1T and 2H phases.…”

Amorphous Electrode: From Synthesis to Electrochemical Energy Storage

“…However, the larger size of zinc ion relative to lithium/sodium/potassium ion causes a non-negligible barrier for insertion/extraction into/from electrode materials. [163][164][165] So far, there are a few materials that can be applied to the cathode of ZIBs, such as manganese-based, [166] vanadium-based, [167,168] Prussian blue analogs, [169,170] and polyanion compounds. [171,172] Considering the poor electric conductivity of these active materials, a hybrid with conductive additives is an effective method to improve the electrochemical performance.…”

PVDF-HFP/PAN/PDA@LLZTO Composite Solid Electrolyte Enabling Reinforced Safety and Outstanding Low-Temperature Performance for Quasi-Solid-State Lithium Metal Batteries

“…Lithium-ion batteries (LIBs) have become the third generation of energy storage devices after nickel–cadmium batteries and nickel–hydrogen batteries. , LIBs have been widely used in the fields of consumer electronics, military equipment, and grid-scale energy storage systems. , With the increasing maturity of LIBs technology, the applications of LIBs have been expanded to the fields of microsatellites, high-orbit satellites, and deep space exploration. , However, traditional LIBs still suffer from safety hazards, such as electrolyte leakage and uncontrollable side reactions which trigger abnormal heating, shrinkage of commercial Celgard separators, and then cell short circuit, burning, and explosions. , Therefore, it is imperative to develop safer battery systems with excellent thermal stability and high mechanical strength. , …”

“…1,2 LIBs have been widely used in the fields of consumer electronics, military equipment, and grid-scale energy storage systems. 3,4 With the increasing maturity of LIBs technology, the applications of LIBs have been expanded to the fields of microsatellites, high-orbit satellites, and deep space exploration. 5,6 However, traditional LIBs still suffer from safety hazards, such as electrolyte leakage and uncontrollable side reactions which trigger abnormal heating, shrinkage of commercial Celgard separators, and then cell short circuit, burning, and explosions.…”