Ruiz-Molina Martín A, Fernandez-Izquierdo Leunam, Grijalva-Saavedra Rubén O, Quevedo-López Manuel, Sotelo-Lerma Mérida
Departamento de Investigación en Polímeros y Materiales, Universidad de Sonora, Blvd. Luis Encinas y Rosales S/N, Hermosillo, Sonora 83000, Mexico.
Materials Science and Engineering Department, University of Texas at Dallas, 2601 North Floyd Road, RL 10, Richardson, Texas 75080, United States.
ACS Omega. 2025 Jul 21;10(30):33767-33776. doi: 10.1021/acsomega.5c04820. eCollection 2025 Aug 5.
This study explores the influence of ionic incorporation via immersion in LiCl and NaCl on the structural, morphological, and electrochemical properties of AlOOH thin films synthesized by chemical bath deposition. X-ray diffraction reveals that LiCl treatment induces the formation of lithium carbonate and aluminum hydroxide phases, a transformation absent in NaCl-treated films, which retain the pristine AlOOH structure. Scanning electron microscopy shows pronounced nanoflake growth in LiCl-treated films, while NaCl exposure yields negligible morphological changes. X-ray photoelectron spectroscopy confirms the formation of surface carbonate species in LiCl-treated samples, suggesting enhanced CO adsorption and conversion facilitated by Li. Electrical characterization via current-voltage measurements indicates increased conductivity in LiCl-treated films due to Li mobility, contrasting with the resistive nature of NaCl-treated counterparts. Electrochemical impedance spectroscopy further supports these findings, revealing ionic diffusion behavior in LiCl-treated samples and limited ionic transport in the NaCl-treated films. These results highlight the unique role of Li in the modification of AlOOH thin films, yielding a room temperature ionic conductivity of 0.77 × 10 S cm, underscoring their potential for applications in ionic sensing, electrochemical storage, and gas capture technologies.
本研究探讨了通过浸入LiCl和NaCl中进行离子掺入对化学浴沉积法合成的AlOOH薄膜的结构、形态和电化学性能的影响。X射线衍射表明，LiCl处理诱导了碳酸锂和氢氧化铝相的形成，而NaCl处理的薄膜中不存在这种转变，后者保留了原始的AlOOH结构。扫描电子显微镜显示，LiCl处理的薄膜中有明显的纳米片状生长，而暴露于NaCl中导致的形态变化可忽略不计。X射线光电子能谱证实了LiCl处理的样品中形成了表面碳酸盐物种，表明Li促进了CO的吸附和转化。通过电流-电压测量进行的电学表征表明，由于Li的迁移率，LiCl处理的薄膜导电性增加，这与NaCl处理的对应物的电阻性质形成对比。电化学阻抗谱进一步支持了这些发现，揭示了LiCl处理的样品中的离子扩散行为以及NaCl处理的薄膜中有限的离子传输。这些结果突出了Li在AlOOH薄膜改性中的独特作用，产生了0.77×10 S cm的室温离子电导率，强调了它们在离子传感、电化学存储和气体捕获技术中的应用潜力。
