The development and application of aqueous zinc-ion batteries still face some obstacles, such as dendrite growth and side reactions triggered by active water. Here, we constructed PVA@SR-ZnMoO4 multifunctional coating on...

Multifunctional SEI-like structure coating stabilizing Zn anode at large current and capacity

Progress towards the integration of technology into living organisms requires power devices that are biocompatible and mechanically flexible. Aqueous zinc ion batteries that use hydrogel biomaterials as electrolytes have emerged as a potential solution that operates within biological constraints; however, most of these batteries feature inferior electrochemical properties. Here, we propose a biocompatible hydrogel electrolyte by utilising hyaluronic acid, which contains ample hydrophilic functional groups. The gel-based electrolyte offers excellent anti-corrosion ability for zinc anodes and regulates zinc nucleation/growth. Also, the gel electrolyte provides high battery performance, including a 99.71% Coulombic efficiency, over 5500 hours of long-term stability, improved cycle life of 250 hours under a high zinc utilization rate of 80%, and high biocompatibility. Importantly, the Zn//LiMn2O4 pouch cell exhibits 82% capacity retention after 1000 cycles at 3 C. This work presents a promising gel chemistry that controls zinc behaviour, offering great potential in biocompatible energy-related applications and beyond. 

A biocompatible electrolyte enables highly reversible Zn anode for zinc ion battery

Recent progress of catalysts for synthesis of cyclic carbonates from CO2 and epoxides

Side reactions on zinc metal anodes are formidable issues that cause limited battery life of aqueous zinc ion batteries (AZIBs). Here, we deploy a facile and controllable layer-by-layer (LbL) self-assembly technique to construct an ion-conductive and mechanically robust electrolyte/anode interface for stabilizing the Zn anode. The LbL film consists of two natural and biodegradable biomacromolecules, chitosan (CS) and sodium alginate (SA). We show that such an LbL film tailors the solvation sheath of Zn ions and facilitates the oriented deposition of Zn. Symmetric cells with the four double layers of CS/SA ((CS/SA)4 -Zn) exhibit stable cycles for over 5200 h. The (CS/SA)4 -Zn||H2 V3 O8 coin cell maintains a specific capacity of 125.5 mAh∙g-1 after 14000 cycles. The pouch cell with an electrode area of 5×7 cm2 also presents a capacity retention of 83% for over 500 cycles at 0.1 A g-1 . No obvious dendrites are observed after long cycles in both symmetric and full cells. Given the cost-effective material and fabrication, and environmental friendliness of the LbL films, this Zn protection strategy may boost the industrial application of AZIBs. This article is protected by copyright. All rights reserved.

A Layer-by-Layer Self-Assembled Biomacromolecule Film for Stable Zinc Anode.

Hydrogen Bond Acceptor Lined Hydrogel Electrolyte toward Dendrite-Free Aqueous Zn Ion Batteries with Low Temperature Adaptability

One-pot synthesis of pyridine-based ionic hyper-cross-linked polymers with hierarchical pores for efficient CO2 capture and catalytic conversion

CO2 utilization plays an important role in rational use of carbon resources and reduction of carbon emissions. It is still a challenge to achieve efficient CO2 utilization by amino acid ionic liquids (AAILs) under room temperature and atmospheric pressure with cocatalyst- and solvent-free conditions. Herein, the newly developed AAILs including 1,1,3,3-tetramethylguanidine cation ([HTMG]+) together with both amino acid and halogen as anions, were simply synthesized by neutralization reaction. Under mild conditions (30 °C, 20 h and 1 MPa CO2), the cycloaddition reaction of CO2 and propylene oxide could be efficiently catalyzed by [HTMG][His][I] with 99 % propylene carbonate yield and selectivity in the absence of additional solvent and cocatalyst. Notably, even at room temperature and atmospheric pressure for 72 h, [HTMG][His][I] also displayed 96 % yield and 99 % selectivity due to the cooperation of [HTMG]+, [His]2– and [I]–. Meanwhile, [HTMG][His][I] performed excellent universality of various epoxides and reusability. Based on the characterization results of 1H and 13C NMR, it was verified that propylene oxide and CO2 were simultaneously activated by the functional groups in [HTMG][His][I]. Hence, the reaction mechanism for CO2 cycloaddition with epoxide catalyzed by [HTMG][His][I] was proposed. This work provided a simple strategy to prepare sustainable AAILs for efficient CO2 utilization under very mild conditions of room temperature and atmospheric pressure (even the low CO2 concentration at simulated flue gases). 

Conversion of CO2 with epoxides to cyclic carbonates catalyzed by amino acid ionic liquids at room temperature

Reducing Zn-ion concentration gradient by SO42−-immobilized interface coating for dendrite-free Zn anode

Experimental and theoretical investigation for the cycloaddition of carbon dioxide to epoxides catalyzed by potassium and boron co-doped carbon nitride.

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One-pot synthesis of pyridine-based ionic hyper-cross-linked polymers with hierarchical pores for efficient CO2 capture and catalytic conversion

One-pot synthesis of pyridine-based ionic hyper-cross-linked polymers with hierarchical pores for efficient CO2 capture and catalytic conversion

Conversion of CO2 with epoxides to cyclic carbonates catalyzed by amino acid ionic liquids at room temperature

Reducing Zn-ion concentration gradient by SO42−-immobilized interface coating for dendrite-free Zn anode

Experimental and theoretical investigation for the cycloaddition of carbon dioxide to epoxides catalyzed by potassium and boron co-doped carbon nitride.