In this study, we provide the reader with an overview of quantum dot application in solar cells to replace dye molecules, where the quantum dots play a key role in photon absorption and excited charge generation in the device. The brief shows the types of quantum dot sensitized solar cells and presents the obtained results of them for each type of cell, and provides the advantages and disadvantages. Lastly, methods are proposed to improve the efficiency performance in the next researching.
The main objective of this study was to compare the effectiveness of three STEM approaches in implementing STEM activities in lower secondary school students based on knowledge and scientific creativity. A pre-posttest experimental design was adapted. Six classes with almost similar learning conditions were randomly selected and each class was assigned as a group, in which two groups followed the Stand–alone engineering design approach, two adopted the 5E-EDP approach, and two classes used the Jigsaw learning approach. The data were collected from the tests before and after the experiments and were statistically analyzed. The findings revealed that these three approaches enhanced the students’ gains in both knowledge and scientific creativity. Despite the overall progress, there existed a statistical difference among these models in their effects on the students’ knowledge and scientific creativity. While 5E-EDP and Jigsaw learning approach were proven to make substantial progress in these factors, the Stand-alone engineering design scored less significance. The study also showed that there was a statistical difference between the Stand-alone engineering design approach and Jigsaw learning approach. The respective second approach formed a foundation for better performance of the students’ knowledge and scientific creativity compared to the first one. Each approachhas its own value in enhancing students’ knowledge and scientific creativity. The result of this study could be a hint for STEM educators to apply appropriate methods in similar contexts to boost achievements.
Water hyacinth is a substantial and quick‐growing plant that can strongly invade and negatively affect the aquatic ecosystem, causing many problems to the water environment by consuming nutrients and oxygen from surface water. However, the hierarchical porous carbon derived from water hyacinth can be employed for the removal of oil spills, heavy metals, or wastewater nutrients. Recently, water‐hyacinth‐derived carbon aerogel has been utilized as electrode for the desalination of brackish water using membrane capacitive deionization (MCDI) technology. In this research, lignocellulose aerogels were synthesized from water hyacinth, which were then pyrolyzed to obtain carbon aerogel and then treated with KOH to acquire activated carbon aerogel, with the corresponding surface area of 51 and 100 m2 g−1. The desalination capacity of the MCDI device was also evaluated using a 200 ppm NaCl feed water solution with an applied potential of 1.2 V. A high salt adsorption capacity value of 14.69 mg g−1 was achieved after 3000 s. These results will lead a new research area of biomass and bio‐waste conversion to fabricate CDI‐utilized carbon aerogel electrodes.
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