材料科学
电极
无机化学
化学工程
吸附
表面改性
膜
离子交换
双功能
电化学
锂(药物)
离子
化学
有机化学
催化作用
内分泌学
物理化学
工程类
医学
生物化学
作者
Junxiang Zhang,Zeyu Cheng,Xinbo Qin,Xi Gao,Rongping Yun,Xu Xiang
标识
DOI:10.1021/acsami.3c04682
摘要
Salt lake brine has become a promising lithium resource, but it remains challenging to separate Li+ ions from the coexisting ions. We designed a membrane electrode having conductive and hydrophilic bifunctionality based on the H2TiO3 ion sieve (HTO). Reduced graphene oxide (RGO) was combined with the ion sieve to improve electrical conductivity, and tannic acid (TA) was polymerized on the surface of ion sieve to enhance hydrophilicity. These bifunctional modification at the microscopic level improved the electrochemical performance of the electrode and facilitated ion migration and adsorption. Poly(vinyl alcohol) (PVA) was used as a binder to further intensify the macroscopic hydrophilicity of the HTO/RGO-TA electrode. Lithium adsorption capacity of the modified electrode in 2 h reached 25.2 mg g-1, more than double that of HTO (12.0 mg g-1). The modified electrode showed excellent selectivity for Na+/Li+ and Mg2+/Li+ separation and good cycling stability. The adsorption mechanism follows ion exchange, which involves H+/Li+ exchange and Li-O bond formation in the [H] layer and [HTi2] layer of HTO.
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