This work has investigated the effect of drying temperature on the crystallite size and lattice strain of NiCoAl-LDH using the Williamson–Hall (W–H) method and tracked the impact of the changes thereof on the electrochemical properties. During the experiments, the drying time was kept unchanged, while the temperature was varied from 70 °C, 80 °C to 90 °C. From the X-ray diffractometer (XRD), Fourier-transform infrared spectroscopy (FTIR), Cyclic voltammetry (CV), and Electrochemical impedance spectroscopy (EIS) results, it was found that the drying temperature had greatly influenced the crystalline structure, the interlamellar domain as well as the electrochemical properties of NiCoAl-LDH. An increment in the crystallite sizes was observed from 4.971 to 12.334 nm as the drying temperature increased from 70 to 80 °C and dropped to 7.681 nm when it reached 90 °C. Similarly, an increase in the specific capacitance was recorded from 1158.26 to 4180.16 Fg at 10 mVs as the drying temperature went up from 70 to 80 °C and dropped to 3775.77 Fg at 10 mVs when the drying temperature increased to 90 °C. Moreover, the sample dried at 80 °C exhibited low internal resistance compared to its counterpart. The best electrochemical performance of the sample dried at 80 °C could be attributed to the larger size of its crystallite. This leads to the conclusion that the electrochemical performance of NiCoAl-LDH could be crystallite size-dependent. Finally, it was proved that the drying temperature () is the best for the drying stage of NiCoAl-LDH.

中文翻译：

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干燥温度对NiCoAl-LDH晶域及电化学性能的影响

本工作采用Williamson-Hall (W-H)方法研究了干燥温度对NiCoAl-LDH的微晶尺寸和晶格应变的影响，并追踪了其变化对电化学性能的影响。实验过程中，干燥时间保持不变，温度从70℃、80℃到90℃变化。从X射线衍射仪(XRD)、傅里叶变换红外光谱(FTIR)、循环伏安法(CV)和电化学阻抗谱(EIS)结果发现，干燥温度对晶体结构、层间结构等影响很大。 NiCoAl-LDH 的结构域以及电化学性能。随着干燥温度从 70 °C 增加到 80 °C，微晶尺寸从 4.971 nm 增加到 12.334 nm，当干燥温度达到 90 °C 时，微晶尺寸下降到 7.681 nm。同样，当干燥温度从 70°C 升至 80°C 时，比电容在 10 mVs 下从 1158.26 Fg 增加到 4180.16 Fg，当干燥温度增加到 90°C 时，比电容在 10 mVs 下下降至 3775.77 Fg。此外，与同类样品相比，在 80 °C 下干燥的样品表现出较低的内阻。在 80 °C 干燥的样品的最佳电化学性能可归因于其晶粒尺寸较大。由此得出的结论是，NiCoAl-LDH 的电化学性能可能依赖于微晶尺寸。最后证明()是NiCoAl-LDH干燥阶段的最佳干燥温度。