No abstract

Teknologi polisi tidur listrik terdiri dari lempeng utama, pegas, lempeng piezoelektrik dan baterai penyimpan tegangan listrik.Tegangan listrik yang dihasilkan oleh prototipe skala mini dengan luas penampang sebesar 0,2 cm2 sebanding dengan frekuensi dan besarnya berat benda yang diberikan. Nilai tegangan vs besar gaya berat benda berturut-turut adalah 0,88 V (3,92 N); 1,0675 V (4,9 N); 1,235 V (5,88 N) dan 1,405 V (6,86 N). Nilai tegangan total vs frekuensi pemberian gaya berat benda yang diberikan berturutturut adalah 5,126 V (15s per 60s); 7,634 V (10s per 60s); dan 13,772 V (5s per 60s). Data yang diterbitkan bps.go.id (2015) menyebutkan bahwa jumlah kendaraan bermotor di Indonesia mencapai angka 114.209.266. Hal ini merupakan suatu potensi yang sangat besar mengingat polisi tidur listrik merupakan teknologi yang mampu mengkonversi tekanan yang dihasilkan oleh kendaraan bermotor saat melewatinya menjadi energi listrik melalui mekanisme deformasi.

CoO nanocrystal is well-known photocatalyst for overall water splitting. However it suffers from a very short lifetime of only 1 h. The poor stability is derived from carrier recombination-induced thermal oxidation. This research will provide information about synthesis of CoO/ZnO nanocrystalline that can potentially enhance photocatalysts. CoO has been synthesized first under hydrothermal method, followed by calcination process. Thereafter, CoO has been used to produce CoO/ZnO under precipitation method. The samples were characterized using XRD (X-Ray Diffraction), FTIR (Fourier Transform Infrared Spectroscopy), and UV-VIS (UV–Visible Spectroscopy) to analyze their composition, chemical functional group, optical absorption, and band gap. The XRD spectrum showed that CoO/ZnO had cubic spinel and hexagonal phase structure with crystallite size of 69.0, 46.4, 32.8, and 32,4 nm. The bands in obtained FTIR spectrum at 586.36, 671.23, and 410-429 cm−1 were correlated with vibrations of the Co3+ in octahedral hole, the Co2+ in tetrahedral hole, and Zn-O, respectively. The band gap energy of CoO, CoO/ZnO with variation of 1:1 and 1:3 were 4.39, 4.14, and 3.65 eV, respectively. The photocatalytic activities of CoO/ZnO were confirmed by methylene blue dyes photodegradation of 663 nm under UV light irradiation in aqueous solution. The 22.4% methylene blue can be removed within 3 h. Overall, these findings reveal the potential of CoO/ZnO for practical application.