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Imparting Stable and Ultrahigh Proton Conductivity to a Layered Rare Earth Hydroxide via Ion Exchange

2024; American Chemical Society; Volume: 16; Issue: 17 Linguagem: Inglês

10.1021/acsami.4c01241

1944-8252

Cong Wang, Yexin Shen, Xiuyuan Wang, Yugang Zhang, Cheng-Zhen Wang, Qin Wang, Hui Li, Shuao Wang, Daxiang Gui,

Layered Double Hydroxides Synthesis and Applications

Proton conductors are essential functional materials with a wide variety of potential applications in energy storage and conversion. In order to address the issues of low proton conductivity and poor stability in conventional proton conductors, a simple and valid ion-exchange method was proposed in this study for the introduction of stable and ultrahigh proton conductivity in layered rare earth hydroxides (LRHs). Test analyses by solid-state nuclear magnetic resonance, Fourier transform infrared spectroscopy, and powder X-ray diffraction revealed that the exchange of H2PO4– not only does not disrupt the layered structure of LRHs, but also creates more active proton sites and channels necessary for proton transport, thereby creating a high-performance proton conductor (LRH-H2PO4–). By utilizing this ion-exchange method, the proton conductivity of LRHs can be significantly enhanced from a low level to an ultrahigh level (>10–2 S·cm–1), while maintaining excellent long-term stability. Moreover, through methodically manipulating the guest ions and molecules housed within the interlayers of LRHs, a comprehensive explanation has been presented regarding the proficient mechanism of proton conduction in LRH-H2PO4–. As a result, this investigation presents a feasible and available approach for advancing proton conductor.