Details

Autor(en) / Beteiligte

• Tian, Cong
• Wang, Jielei
• Sun, Ruoxuan
• Ali, Tariq
• Wang, Hongfei
• Xie, Bin‐Bin
• Zhong, Yijun
• Hu, Yong

Titel

Improved Interfacial Ion Migration and Deposition through the Chain‐Liquid Synergistic Effect by a Carboxylated Hydrogel Electrolyte for Stable Zinc Metal Anodes

Ist Teil von

• Angewandte Chemie International Edition, 2023-10, Vol.62 (42), p.e202310970-e202310970

Auflage

International ed. in English

Ort / Verlag

Weinheim: Wiley Subscription Services, Inc

Erscheinungsjahr

2023

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Abstract The large‐scale applicability of Zn‐metal anodes is severely impeded by the issues such as the dendrite growth, complicated hydrogen evolution, and uncontrollable passivation reaction. Herein, a negatively charged carboxylated double‐network hydrogel electrolyte (Gelatin/Sodium alginate‐acetate, denoted as Gel/SA‐acetate) has been developed to stabilize the interfacial electrochemistry, which restructures a type of Zn 2+ ion solvent sheath optimized via a chain‐liquid synergistic effect. New hydrogen bonds are reconstructed with water molecules by the zincophilic functional groups, and directional migration of hydrated Zn 2+ ions is therefore induced. Concomitantly, the robust chemical bonding of such hydrogel layers to the Zn slab exhibits a desirable anti‐catalytic effect, thereby greatly diminishing the water activity and eliminating side reactions. Subsequently, a symmetric cell using the Gel/SA‐acetate electrolyte demonstrates a reversible plating/stripping performance for 1580 h, and an asymmetric cell reaches a state‐of‐the‐art runtime of 5600 h with a high average Coulombic efficiency of 99.9 %. The resultant zinc ion hybrid capacitors deliver exceptional properties including the capacity retention of 98.5 % over 15000 cycles, energy density of 236.8 Wh kg −1 , and high mechanical adaptability. This work is expected to pave a new avenue for the development of novel hydrogel electrolytes towards safe and stable Zn anodes.