Lerkkasemsan, Nuttapol

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Lerkkasemsan, Nuttapol
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nuttapol.le@kmitl.ac.th

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    Mn-Fe Prussian blue analogue as low-cost robust cathode for non-aqueous Zn-ion batteries
    (2023-03-01)
    Yimtrakarn, Trakarn
    ;
    Liao, Yi Chih
    ;
    MV, Ahmed Sanin
    ;
    Chen, Jeng Lung
    ;
    Chuang, Yu Chun
    Zn-ion batteries (ZIBs) are one of the most promising alternatives for large-scale energy storage systems due to two-electron transfer capability, safety, low toxicity, and low cost. However, most of the cathode materials reported for non-aqueous ZIBs still show unsatisfactory electrochemical performance. To overcome this, factors such as type of crystal structure, transition metal-ion coordination, and nature of the d orbitals being filled must be taken into consideration in the design of suitable host materials. Herein, we report the use of a Prussian blue analogue, sodium manganese hexacyanoferrate (NaMnFe-PB), as cathode in ZIBs. Its ease of synthesis, rigid open framework, and compositional and electrochemical tunability make this low-cost Mn-Fe-based compound highly attractive. The strong interactions among the two redox centers Mn<sup>III</sup>/Mn<sup>II</sup>, Fe<sup>III</sup>/Fe<sup>II</sup>, and C[tbnd]N<sup>-</sup> ligand allow two close voltage plateaus at ∼1.50 V vs Zn/Zn<sup>2+</sup>, delivering a capacity of 89.5 mAh g<sup>-1</sup>. Ex-situ X-ray absorption and diffraction techniques confirm the high redox reversibility and structural stability of NaMnFe-PB upon divalent guest insertion. The Fe(CN)<inf>6</inf> vacancies and coordinated water in the host lattice are believed to facilitate cation diffusion. The insight gained in this work may pave the way for the design of low-cost cathode materials for next-generation large-scale energy storage systems.
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    Study of Lignin Extracted from Rubberwood Using Microwave Assisted Technology for Fuel Additive
    (2022-02-01)
    Yimtrakarn, Trakarn
    ;
    Kaveevivitchai, Watchareeya
    ;
    Lee, Wen Chien
    ;
    Lerkkasemsan, Nuttapol
    Lignin is the most abundant natural aromatic polymer, especially in plant biomass. Lignin-derived phenolic compounds can be processed into high-value liquid fuel. This study aimed to determine the yield of lignin by the microwave-assisted solvent extraction method and to characterize some essential properties of the extracted lignin. Rubberwood sawdust (Hevea brasiliensis) was extracted for lignin with an organic-based solvent, either ethanol or isopropanol, in a microwave oven operating at 2450 MHz. Two levels of power of microwave, 100 W and 200 W, were tested as well as five extraction times (5, 10, 15, 20, 25, and 30 min). The extracted lignin was characterized by Klason lignin, Fourier transform infrared spectroscopy (FT-IR), 2D HSQC NMR, Ultraviolet-visible spectrophotometry (UV-vis), and Bomb calorimeter. The results showed that the yield of extracted lignin increased with the extraction time and power of the microwave. In addition, the extraction yield with ethanol was higher than the yield with isopropanol. The highest yield was 6.26 wt.%, with ethanol, 30 min extraction time, and 200 W microwave power.