阳极
材料科学
腐蚀
明胶
化学工程
电解质
极化(电化学)
图层(电子)
电极
金属
纳米技术
冶金
有机化学
化学
物理化学
工程类
作者
Bing Wu,Jia Li,Shengpu Rao,Chengjin Zheng,Weihao Song,Qing Ma,Jin Niu,Feng Wang
出处
期刊:Small
[Wiley]
日期:2024-03-12
标识
DOI:10.1002/smll.202400926
摘要
Abstract As corrosion products of Zn anodes in ZnSO 4 electrolytes, Zn 4 SO 4 (OH) 6 ·xH 2 O with loose structure cannot suppress persistent side reactions but can increase the electrode polarization and induce dendrite growth, hindering the practical applications of Zn metal batteries. In this work, a functional layer is built on the Zn anode by a gelatin‐assistant corrosion and low‐temperature pyrolysis method. With the assistant of gelatin, undesired corrosion products are converted into a uniform nanoflake array comprising ZnO coated by gelatin‐derived carbon on Zn foil (denoted Zn@ZnO@GC). It is revealed that the gelatin‐derived carbons not only enhance the electron conductivity, facilitate Zn 2+ desolvation, and boost transport/deposition kinetics, but also inhibit the occurrence of hydrogen evolution and corrosion reactions on the zincophilic Zn@ZnO@GC anode. Moreover, the 3D nanoflake array effectively homogenizes the current density and Zn 2+ concentration, thus inhibiting the formation of dendrites. The symmetric cells using the Zn@ZnO@GC anodes exhibit superior cycling performance (over 7000 h at 1 mA cm −2 /1 mAh cm −2 ) and without short‐circuiting even up to 25 mAh cm −2 . The Zn@ZnO@GC||NaV 3 O 8 full cell works stably for 5000 cycles even with a limited N/P ratio of ≈5.5, showing good application prospects.
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