Abstract:Rechargeable aqueous zinc-ion batteries (AZIBs) have attracted more attention in large-scale energy storage systems arising from their unique merits, such as intrinsic safety, low cost, and relatively high theoretical energy...
“…1 a) [ 34 ]. Theoretically, HER and ZHS formation are significantly affected by the pH value of the electrolyte according to the following reactions [ 35 ]: Fig. 1 Schematic illustration of the Zn plating process in a BE and b DE …”
Although their cost-effectiveness and intrinsic safety, aqueous zinc-ion batteries suffer from notorious side reactions including hydrogen evolution reaction, Zn corrosion and passivation, and Zn dendrite formation on the anode. Despite numerous strategies to alleviate these side reactions have been demonstrated, they can only provide limited performance improvement from a single aspect. Herein, a triple-functional additive with trace amounts, ammonium hydroxide, was demonstrated to comprehensively protect zinc anodes. The results show that the shift of electrolyte pH from 4.1 to 5.2 lowers the HER potential and encourages the in situ formation of a uniform ZHS-based solid electrolyte interphase on Zn anodes. Moreover, cationic NH4+ can preferentially adsorb on the Zn anode surface to shield the “tip effect” and homogenize the electric field. Benefitting from this comprehensive protection, dendrite-free Zn deposition and highly reversible Zn plating/stripping behaviors were realized. Besides, improved electrochemical performances can also be achieved in Zn//MnO2 full cells by taking the advantages of this triple-functional additive. This work provides a new strategy for stabilizing Zn anodes from a comprehensive perspective.
“…1 a) [ 34 ]. Theoretically, HER and ZHS formation are significantly affected by the pH value of the electrolyte according to the following reactions [ 35 ]: Fig. 1 Schematic illustration of the Zn plating process in a BE and b DE …”
Although their cost-effectiveness and intrinsic safety, aqueous zinc-ion batteries suffer from notorious side reactions including hydrogen evolution reaction, Zn corrosion and passivation, and Zn dendrite formation on the anode. Despite numerous strategies to alleviate these side reactions have been demonstrated, they can only provide limited performance improvement from a single aspect. Herein, a triple-functional additive with trace amounts, ammonium hydroxide, was demonstrated to comprehensively protect zinc anodes. The results show that the shift of electrolyte pH from 4.1 to 5.2 lowers the HER potential and encourages the in situ formation of a uniform ZHS-based solid electrolyte interphase on Zn anodes. Moreover, cationic NH4+ can preferentially adsorb on the Zn anode surface to shield the “tip effect” and homogenize the electric field. Benefitting from this comprehensive protection, dendrite-free Zn deposition and highly reversible Zn plating/stripping behaviors were realized. Besides, improved electrochemical performances can also be achieved in Zn//MnO2 full cells by taking the advantages of this triple-functional additive. This work provides a new strategy for stabilizing Zn anodes from a comprehensive perspective.
“…30 A Mn/Mn 3 O 4 catalyst with a monomeric core–shell structure shows good catalytic activity and durability for ORR, which is a potential non-precious metal electrocatalyst. 31 The above research results show that how to prepare a single crystalline and stable MnO 2 -based catalyst carrier and improve the electrocatalytic performance of the catalyst is a difficult and hot topic in this field, and further research should be carried out.…”
Under the synergistic effect of the triblock copolymer P123 and sucrose, the obtained hexagonal Pd can be loaded onto the chain MnOOH and three-dimensional carbon grid, and the formed Pd-C-MnOOH composite catalyst shows enhanced ORR performance.
“…The continuous dendritic growth of Zn at the anode side causes severe side reactions in aqueous electrolytes and may also puncture the separator, leading to poor Coulombic efficiency and short cycling life of the battery. [9][10][11][12][13][14][15][16] This problem is more…”
Section: Introductionmentioning
confidence: 99%
“…The continuous dendritic growth of Zn at the anode side causes severe side reactions in aqueous electrolytes and may also puncture the separator, leading to poor Coulombic efficiency and short cycling life of the battery. 9–16 This problem is more challenging in practical batteries with high energy density requiring a high depth of discharge (DOD) and balanced negative/positive (N/P) capacity ratio. 17–20…”
Aqueous zinc-ion batteries (ZIBs) are promising candidates for next-generation energy storage systems due to their intrinsic safety, environmental friendliness, and low cost. However, the uncontrollable Zn dendrite growth during cycling...
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