CD Tesis

Grain Growth Evaluation Of Nanostructured ZnCo2O4 For Solar Selective Absorber Application

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Ternary cobalt-based metal oxide (ZnCo2O4) has been successfully coated onto aluminum substrate via sol-gel method for solar selective absorber application. The aim of this study to evaluate the influence of temperature and concentration on the morphology, crystalline structure and optical properties of zinc cobalt oxide coating. ZnCo2O4 were synthesized using Co(NO3)2.6H2O and Zn(NO3)2.3H2O concentration of 0.3M, 0.5M and 0.7M. The precursors were dissolved in absolute ethanol and subsequently the propionic acid 0.1M were added. The solution oxide was then deposited on the top of cleaned aluminum using a spin coating technique.The coatings were characterized by: X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), energy dispersive X-ray (EDX) and UV–Vis–NIR spectrophotometry. Thermal degradation of the coatings were probed by thermogravimetric analysis (TGA) and differential thermal analysis (DTA). The crystallite size of ZnCo2O4 observed using XRD showed the main peak of 44.75, 65.0, and 78.2 with range of diameter size of around 12-47nm. The increase of precursor concentration and annealing temperature caused decreasing the crystallite size of ZnCo2O4 due to the transformation into the Co3O4 at higher temperature as indicated in the DTA-TGA analyses. The morphology of ZnCo2O4 illustrated the homogeneity per each concentration and shown a transformation when the concentration and temperature increased. The unique structure of ZnCo2O4 was nanorose-like and they comprises of many porous nanosheets with interconnected each other. The absortance of ZnCo2O4 was influenced by precursor concentration and annealing temperature with the highest absorptance value of α=70.7% synthesized using 0.7 M at 400 C. The evolution of grain growth ZnCo2O4 was calculated by approaching LSW model which had R2 value of 0.853 and percentage (%) of error around 4.46%- 13.70%. The model proved that experiment data was limited by diffusion process from material ZnCo2O4.
Keywords: crystallite, coating, evaluation, grain growth, solar selective absorber, ZnCo2O4.

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Ketersediaan

Informasi Detail

Judul Seri

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No. Panggil

10 13. 218 (0004)

Penerbit

Pekanbaru : Universitas Riau – Pasca Sarjana – Tesis Teknik Kimia., 2018

Deskripsi Fisik

xiv, 115 hlm.; ill.; 29 cm

Bahasa

Indonesia

ISBN/ISSN

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Klasifikasi

10 13. 218 (0004)

Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

PASCASARJANA (MAGISTER) TEKNIK KIMIA

Info Detail Spesifik

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Pernyataan Tanggungjawab

FATAH

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