El objetivo del siguiente trabajo es estudiar la utilidad del pigmento obtenido de la cáscara de la batata morada para sensibilizar celdas solares. Las celdas se construyeron utilizando láminas conductoras de ITO recubiertas con una capa de nanopartículas de TiO2 como fotoánodo y carbono como contraelectrodo, se preparó un extracto alcohólico de cáscara de batata morada que se integró a la capa de TiO2 como colorante-sensibilizador. Se estudió el desempeño de las DSSC irradiándolas con luz a diferentes longitudes de onda con potencia constante. Los resultados electroquímicos muestran valores de VOC = 0.374 V, JSC = 0.0244 mA/cm2, FF = 0.471 y una eficiencia de 0.0143 % para cuando las celdas fueron irradiadas con luz de 470 nm. Los resultados de EIS confirman este desempeño al mostrar una baja resistencia al flujo de cargas libres bajo esta longitud de onda. Este trabajo con...

In our study, the cathodic material xLi2MnO3–(1−x)LiNi0.5Mn0.5O2 was synthesized by means of the co-precipitation technique. The effect of x (proportion of components Li2MnO3 and LiNi0.5Mn0.5O2) on the structural, morphological, and electrochemical performance of the material was evaluated. Materials were structurally characterized using X-ray diffraction (XRD), and the morphological analysis was performed using the scanning electron microscopy (SEM) technique, while charge–discharge curves and differential capacity and impedance spectroscopy (EIS) were used to study the electrochemical behavior. The results confirm the formation of the structures with two phases corresponding to the rhombohedral space group R3m and the monoclinic space group C2/m, which was associated to the components of the layered material. Very dense agglomerations of particles between 10 and 20 µm were also ...

In this study, the effect of operating temperature at 55 °C on xLi2MnO3-(1-x)LiMn0.5Ni0.5O2 electrodes during the charge/discharge process at different current densities was investigated. X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used for structural and morphological analysis of the fabricated cathode materials, while charge-discharge curves and differential capacity were used to study the electrochemical behavior. Results confirm the formation of the structures with two phases associated withthe components of the layered material. It was found that at 55 °C, a capacity higher than 357 mAh g-1 could be achieved at a voltage of 2.5-4.8 V vs. Li/Li+, which was larger than the capacity achieved at room temperature. At 55 °C, a change in valence could be observed during charging and discharging due to the change in the position of the peaks associated with Mn and...

El objetivo de la siguiente investigación fue estudiar el efecto del extracto alcohólico de piel de mango al incorporarlo en películas biodegradables activas fabricadas a partir de almidón de semilla de mango. Se utilizó desperdicio de piel de mango de la variedad Kent en un proceso de secado y maceración para obtener el extracto (ME). El extracto fue adicionado en el proceso de gelatinización de las películas en concentraciones de 5% y 10% v/v. Las propiedades ópticas del extracto de mango se caracterizaron mediante espectrofotometría UV-Vis, mientras que la identificación de los grupos funcionales se realizó mediante espectroscopía FTIR. Se estudió la morfología de las películas, mientras que las propiedades activas se caracterizaron mediante cinética de absorción de agua y biodegradación por enterramiento en suelo. También se estudiaron las propiedades mecánicas, ...

In the following investigation, concrete specimens incorporated with sugarcane bagasse fibers (SCBF) were manufactured to analyze their effects on their physical and mechanical properties. The fibers were collected from the waste generated by the sugar factories in the La Libertad region, Peru. SCBF were incorporated in different concentrations (0.5, 1, 1.5 and 2%) in the concrete mixing process. The effect of the incorporation of SCBF on the density and water absorption of the manufactured specimens were evaluated, also morphological variations were analyzed by Scanning Electron Microscopy (SEM). Likewise, the specimens were subjected to compression tests to verify their resistance. A good integration of the fibers in the concrete matrix was observed, the incorporation of SCBF produces a reduction in the number and size of pores. In addition, the increase in SCBF lightens the concrete, ...

RESUMEN Este trabajo tuvo como finalidad estudiar el efecto de la incorporación de extracto de piel de mango (EPM) sobre las propiedades de películas biodegradables fabricadas a partir de almidón de semillas de mango y comprobar su potencial para ser usado en envasado activo. El EPM fue añadido en el proceso de gelatinización en concentraciones de 5, 10 y 15% wt. Las propiedades de las películas fabricadas fueron caracterizadas usando Microscopía Electrónica de Barrido (MEB), Espectroscopía FTIR, cinética de absorción de agua y curvas Esfuerzo-Deformación. Las micrografías MEB muestran una formación más limpia de residuos, sin vacíos ni grietas en las películas con EPM. Los análisis FTIR confirman la formación de bioplástico de almidón por la presencia de los grupos funcionales O-H, C-H, C-O y O=H. Por otro lado, se confirma que al añadir EPM se logra un aumento en ...

RESUMEN El objetivo del estudio fue evaluar el efecto en la estabilidad de las nanopartículas de plata sintetizadas por ruta química, como función de la variación del tiempo de exposición de la intensidad luminosa. Se evaluaron por espectrofotometría UV-Vis dos casos, el primero para solución coloidal, el cual mostró tener su pico de absorbancia en 434 nm, típico en nanopartículas de plata con morfología esférica; en un segundo caso para solución coloidal bajo exposición de intensidad luminosa constante (4409 lux) con tiempos que van desde 15 horas hasta 48 horas. Los resultados sugieren el incremento del diámetro de las nanoesferas en función al incremento del tiempo de exposición luminosa, así como un aumento de la absorbancia, lo que indica una posible reacción incompleta y una mayor producción.

Microbial fuel cells are a bioelectrochemical technology that uses different types of waste as fuel sources to generate sustainable and environmentally friendly electricity. Various MFCs have been developed, with the electrode used being a crucial problem due to its high manufacturing cost. This research shows that electrodes can be manufactured quickly and economically using activated carbon (100 g), sugar (80 g), ethanol (250 ml), and pine resin (200 g). For its demonstration, grape waste was used in a single-chamber MFC for 35 days. The manufactured electrode generated a Rint. of 18.471 ± 2.475 Ω, whose current density was 8.348 ±0.768 mW/cm2 at a current density of 5.166 A/cm2. The electrical potential shown was 0.889 ± 0.017 V and 4.571 ± 0.061 mA, with an ORPmax of 81.495 ± 1.874 mV, operating at a pH of 7.26 ±0.19. The micrographs made by scanning electron microscopy showed...

La investigación aborda la nanofertilización sostenible y sus impactos en el proceso de germinación de las semillas de quinua. El estudio se centra en el uso de nanopartículas de plata producidas mediante síntesis verde, destacando la importancia de los métodos ecológicos en la nanotecnología agrícola. A través de evaluaciones detalladas y análisis estadísticos, examinamos cómo estas nanopartículas afectan el crecimiento inicial de las semillas de quinua. Los resultados ofrecen información esencial sobre la eficacia de la nanofertilización ecológica para promover el desarrollo de la germinación de este cultivo clave. Este estudio surge como una valiosa contribución a la vanguardia de la nanotecnología agrícola, destacando su enfoque directo en la búsqueda activa de soluciones sostenibles para optimizar la productividad agrícola. Al profundizar en las ventajas intr�...

The excessive use of fossil sources for the generation of electrical energy and the increase in different organic wastes have caused great damage to the environment; these problems have promoted new ways of generating electricity in an eco-friendly manner using organic waste. In this sense, this research uses single-chamber microbial fuel cells with zinc and copper as electrodes and pineapple waste as fuel (substrate). Current and voltage peaks of 4.95667 ± 0.54775 mA and 0.99 ± 0.03 V were generated on days 16 and 20, respectively, with the substrate operating at an acid pH of 5.21 ± 0.18 and an electrical conductivity of 145.16 ± 9.86 mS/cm at two degrees Brix. Thus, it was also found that the internal resistance of the cells was 865.845 ± 4.726 Ω, and a maximum power density of 513.99 ± 6.54 mW/m2 was generated at a current density of 6.123 A/m2, and the final FTIR spectrum sho...

The excessive use of fossil sources for the generation of electrical energy and the increase in different organic wastes have caused great damage to the environment; these problems have promoted new ways of generating electricity in an eco-friendly manner using organic waste. In this sense, this research uses single-chamber microbial fuel cells with zinc and copper as electrodes and pineapple waste as fuel (substrate). Current and voltage peaks of 4.95667 ± 0.54775 mA and 0.99 ± 0.03 V were generated on days 16 and 20, respectively, with the substrate operating at an acid pH of 5.21 ± 0.18 and an electrical conductivity of 145.16 ± 9.86 mS/cm at two degrees Brix. Thus, it was also found that the internal resistance of the cells was 865.845 ± 4.726 Ω, and a maximum power density of 513.99 ± 6.54 mW/m2 was generated at a current density of 6.123 A/m2, and the final FTIR spectrum sho...

The excessive use of fossil sources for the generation of electrical energy and the increase in different organic wastes have caused great damage to the environment; these problems have promoted new ways of generating electricity in an eco-friendly manner using organic waste. In this sense, this research uses single-chamber microbial fuel cells with zinc and copper as electrodes and pineapple waste as fuel (substrate). Current and voltage peaks of 4.95667 ± 0.54775 mA and 0.99 ± 0.03 V were generated on days 16 and 20, respectively, with the substrate operating at an acid pH of 5.21 ± 0.18 and an electrical conductivity of 145.16 ± 9.86 mS/cm at two degrees Brix. Thus, it was also found that the internal resistance of the cells was 865.845 ± 4.726 Ω, and a maximum power density of 513.99 ± 6.54 mW/m2 was generated at a current density of 6.123 A/m2 , and the final FTIR spectrum s...

The excessive use of fossil sources for the generation of electrical energy and the increase in different organic wastes have caused great damage to the environment; these problems have promoted new ways of generating electricity in an eco-friendly manner using organic waste. In this sense, this research uses single-chamber microbial fuel cells with zinc and copper as electrodes and pineapple waste as fuel (substrate). Current and voltage peaks of 4.95667 ± 0.54775 mA and 0.99 ± 0.03 V were generated on days 16 and 20, respectively, with the substrate operating at an acid pH of 5.21 ± 0.18 and an electrical conductivity of 145.16 ± 9.86 mS/cm at two degrees Brix. Thus, it was also found that the internal resistance of the cells was 865.845 ± 4.726 Ω, and a maximum power density of 513.99 ± 6.54 mW/m2 was generated at a current density of 6.123 A/m2 , and the final FTIR spectrum s...

The enormous environmental problems that arise from organic waste have increased due to the significant population increase worldwide. Microbial fuel cells provide a novel solution for the use of waste as fuel for electricity generation. In this investigation, onion waste was used, and managedtogeneratemaximumpeaksof4.459±0.0608mAand0.991±0.02Vofcurrentandvoltage, respectively. The conductivity values increased rapidly to 179,987±2859 mS/cm, while the optimal pH in which the most significant current was generated was 6968 ± 0.286, and the ◦ Brix values decreased rapidly due to the degradation of organic matter. The microbial fuel cells showed a low internal resistance (154,389±5228 Ω), with a power density of 595.69±15.05 mW/cm2 at a current density of 6.02 A/cm2; these values are higher than those reported by other authors in the literature. The diffractogram spectra of the ...

The enormous environmental problems that arise from organic waste have increased due to the significant population increase worldwide. Microbial fuel cells provide a novel solution for the use of waste as fuel for electricity generation. In this investigation, onion waste was used, and managed to generate maximum peaks of 4.459 0.0608 mA and 0.991 0.02 V of current and voltage, respectively. The conductivity values increased rapidly to 179,987 2859 mS/cm, while the optimal pH in which the most significant current was generated was 6968 0.286, and the Brix values decreased rapidly due to the degradation of organic matter. The microbial fuel cells showed a low internal resistance (154,389 5228 W), with a power density of 595.69 15.05 mW/cm2 at a current density of 6.02 A/cm2; these values are higher than those reported by other authors in the literature. The diffractogram spectra of the on...

El objetivo del estudio es Desarrollar nuevas membranas biocompatibles basadas en biopolímeros conjugados con nanopartículas ferroeléctricas de titanato de bario, manteniendo sus propiedades piezoeléctricas, con potencial aplicación en implantes que aceleren el proceso de osteogénesis. Metodología: El diseño es experimental. El procedimiento será el siguiente: 1. Optimización del tratamiento de recocido de las nanopartículas de titanato de bario (BaTiO3) para la formación de la estructura ferroeléctrica y, su modificación superficial con grupos hidroxilos (-OH). 2. Caracterización morfológica (por Microscopia electrónica de barrido-MEB y de transmisión), tamaño promedio y potencial Z (Dynamic light scattering-DLS), estructura cristalina (por difracción de rayos X), estructura química por FTIR de las nanopartículas ferroeléctricas de titanato de bario. 3. Formación...

“: Fruit waste has increased exponentially worldwide, within which tangerine is one of those that generates a greater amount of organic waste, which is currently not fully used. On the other hand, microbial fuel cells (MFCs) are presented as an opportunity to take advantage of organic waste to generate electricity, which is why the main objective of this research is to generate bioelectricity using tangerine waste as a substrate in microbial fuel cells using zinc and copper electrodes. It was possible to generate current and voltage peaks of 1.43973 ± 0.05568 mA and 1.191 ± 0.035 V on days eighteen and seventeen, respectively, operating with an optimum pH of 4.78 ± 0.46 and with electrical conductivity of the substrate of 140.07 ± 3.51 mS/cm, while the Brix degrees gradually decreased until the last day. The internal resistance determined was 65.378 ± 1.967 Ω, while the maximum p...

Microbial fuel cells have undergone several modifications since their creation, mainly due to the different substrates that can be used as fuel for the generation of electrical energy. In this research, a deep and updated analysis of the characteristics of the literature published in the Scopus database from 1990 to 30 December 2022 has been carried out, finding 7055 documents indexed. The most used keywords are microbial fuel cells, performance, and electricity generation. From 2011 to the present, 5289 article-type documents were published; the article entitled “Microbial Fuel Cells: Methodology and Technology” by Logan B. E. et al., 2006 from Pennsylvania State University, USA in the Environmental Science and Technology journal of the ACS publisher was the most cited (4496 citations). On the other hand, in recent years, Chinese universities have begun to produce and highlight a nu...

“Fruit waste has increased exponentially worldwide, within which tangerine is one of those that generates a greater amount of organic waste, which is currently not fully used. On the other hand, microbial fuel cells (MFCs) are presented as an opportunity to take advantage of organic waste to generate electricity, which is why the main objective of this research is to generate bioelectricity using tangerine waste as a substrate in microbial fuel cells using zinc and copper electrodes. It was possible to generate current and voltage peaks of 1.43973 ± 0.05568 mA and 1.191 ± 0.035 V on days eighteen and seventeen, respectively, operating with an optimum pH of 4.78 ± 0.46 and with electrical conductivity of the substrate of 140.07 ± 3.51 mS/cm, while the Brix degrees gradually decreased until the last day. The internal resistance determined was 65.378 ± 1.967 Ω, while the maximum pow...

Microbial fuel cells have undergone several modifications since their creation, mainly due to the different substrates that can be used as fuel for the generation of electrical energy. In this research, a deep and updated analysis of the characteristics of the literature published in the Scopus database from 1990 to 30 December 2022 has been carried out, finding 7055 documents indexed. The most used keywords are microbial fuel cells, performance, and electricity generation. From 2011 to the present, 5289 article-type documents were published; the article entitled “Microbial Fuel Cells: Methodology and Technology” by Logan B. E. et al., 2006 from Pennsylvania State University, USA in the Environmental Science and Technology journal of the ACS publisher was the most cited (4496 citations). On the other hand, in recent years, Chinese universities have begun to produce and highlight a nu...