Ag-doped Cu nanoboxes supported by rGO for ultra-stable Zn anodes in aqueous Zn-ion battery  

作　　者：Lirong Feng Jinkai Zhang Dong Wang Xinhui Jin Haoyu Ma Kai Zhang Xiaohui Guo 

机构地区：[1]Key Lab of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, The College of Chemistry and Materials Science, Northwest University, Xi’an, 710069, China [2]Sustainable Materials and Chemistry, Dept. Wood Technology and Wood-based Composites, University of Goettingen, Wilhelmsplatz 1 (Aula), 37073, Göttingen, Germany

出　　处：《Nano Research》2024年第11期9688-9696,共9页纳米研究（英文版）

基　　金：supported by the key projects of intergovernmental international cooperation in key R&D programs of the Ministry of Science and Technology of China(No.2021YFE0115800);the National Science Funding Committee of China(No.U20A20250);the programs of the science and technology of Yulin City(No.CXY-2023-ZX04);the funding support from Shccig-Qinling Program.

摘　　要：Advanced aqueous zinc-ion batteries have been greatly limited application caused by uncontrollable dendrite formation, hydrogen evolution and zinc metal corrosion, which can lead to quick failure of the battery and low Coulombic efficiency. Three-dimensional (3D) porous host strategy is available to limit zinc dendrite growth and electrode interfacial side reactions. Herein, an ingenious local levelling and macro stereo strategy is rationally designed as a Zn plating/stripping scaffold. The flexible 3D carbon cloth as the structural and conductive framework is coated by Ag-Cu-reduced graphene oxide (Ag-Cu-rGO) and Ketjen black. Benefiting from the uniformly dispersed zincophilic Ag on the surface of Cu nanoboxes, the anode suppresses hydrogen evolution side reactions and reduces local current density via more nucleation sites. In addition, rGO homogenizes both the ion flux and electric field at the electrode surface, resulting from high conductivity and large specific surface area of rGO. As a result, the fabricated Zn//Ag-Cu-rGO asymmetric cells exhibit stable voltage profiles for plating and striping 250 cycles, maintain nearly 100% Coulombic efficiency at 2 mA·cm^(−2) and 1 mAh·cm^(−2) as well as behave an extremely small nucleation overpotential of 34 mV and Ag-Cu-rGO@Zn symmetric cell presents highly uniform electric field with a superior lifespan over 2500 h at 1 mA·cm^(−2) and 1 mAh·cm^(−2), respectively. Meanwhile, this efficient Ag-Cu-rGO@Zn anode also enables a substantially stable Ag-Cu-rGO@Zn//V2O_(3) full cell over 2000 cycles. The work opens a new avenue of 3D host for durable and dendrite-free flexible aqueous zinc-ion batteries anode.

关 键 词：reduced graphene oxide(rGO) DOPING zinc-ion batteries Coulombic efficiency stability 

分 类 号：TM912[电气工程—电力电子与电力传动]