Indochina Applied Sciences

Carbon Nanotubes and Copper Oxide as Electro-Catalysts for Rechargeable Zinc-Air Batteries

Chonyada Kornsai — 2025-12-31

CNTs and CuO will be used as electrocatalysts for redox reactions in rechargeable zinc-air batteries as the aim of this research. A carbon felt substrate was used to coat the CuO/CNTs composite, and the cathode properties were examined. Analyzed using XRD, FE-SEM, EDS, FT-IR, CV, and LSV. The results indicate that CuO/CNTs exhibits a monoclinic and hexagonal crystal structure, along with the presence of aromatic structures within the CNTs. The retention of PVDF was confirmed, and the composite demonstrated uniform dispersion on the carbon felt. The elemental composition was found to be C (54.52%), F (37.35% Cu (4.95%) and O (3.18%). At an applied voltage of 2 V, the current density increased from
0.66 to 6.92 mA cm^–2, while at 2.40 V, the current density decreased from -0.34 to -3.67 mA cm^–2. After 50 cycles, the current density declined by 5− 10%, indicating moderate electrochemical stability. The findings suggest that CuO/CNTs is a promising bifunctional electrocatalyst for both OER and ORR. Additionally, this research can be further developed into educational materials to enhance the understanding of zinc-air battery technology.

Dual Function of Streptomyces sp. KKU215 in Biocontrol of Bacterial Wilt and Growth Promotion of Chili

Aroon Wongjiratthiti — 2026-02-17

Bacterial wilt, caused by Ralstonia pseudosolanacearum, poses a serious threat to chili production. This study investigated the dual potential of Streptomyces sp. KKU215 as both a biocontrol agent against this pathogen and a plant growth-promoting bacterium for chili. The research involved in vitro antagonism assays, effects on chili seedling growth through seed priming, and effects in the biocontrol of bacterial wilt and growth promotion in pot experiments. In vitro assays confirmed that Streptomyces sp. KKU215 effectively inhibited R. pseudosolanacearum growth within 2 days, producing a clear zone with a diameter of 32.20 mm. Priming chili seeds with Streptomyces sp. KKU215 for 30 min significantly enhanced seedling growth 30 days after seeding, with increases in shoot length (14.21 vs. 12.25 cm), total length (21.05 vs. 18.63 cm), fresh weight (16.04 vs. 12.40 g), and dry weight (1.88 vs. 1.20 g), accompanied by a denser root system and larger leaves compared to the control. Most notably, in pot experiments, application of Streptomyces sp. KKU215 significantly suppressed bacterial wilt, achieving a disease severity reduction from 87.50% in the control to only 16.67% in the treated plants. Streptomyces sp. KKU215-treated seedlings showed enhanced growth, with enhanced growth, reaching maximum values for shoot length
(28.26 cm), root length (24.93 cm), fresh weight (7.56 g), and dry weight (0.89 g). These findings highlight Streptomyces sp. KKU215 is a highly promising dual-function agent for sustainable chili cultivation. Further validation in field trials and the development of a stable formulation are essential next steps for practical application.

Cost-Effective Electrical Power Control and Monitoring System Using Hybrid Sensing Architecture over LoRaWAN

Jagraphon Obma — 2026-03-18

This research aims to a cost-effective electrical power control and monitoring system using hybrid sensing Architecture over LoRaWAN. The system employs a power measurement module (Pzem004t) to monitor the building's power consumption and a current sensor (ACS712-30A) to measure the electrical current of the equipment in use. The collected data is transmitted to an Arduino UNO R3 microcontroller, which is connected to an ESP32 microcontroller responsible for controlling the RFM95w module. Through the LoRa protocol, the system sends data to the CAT LoRa IoT gateway, enabling data visualization and control through a web application.In the experimental phase, the system effectively measures the energy consumption of electrical appliances and automatically responds when power consumption exceeds the specified limit. The system accurately displays total electric power consumption, power factor, total electricity cost, and voltage. Additionally, the system records the current values every minute. The experimental results demonstrated that the system operates effectively over a transmission distance of 5 km via the CAT LoRaWAN gateway. The measurement accuracy, when compared to a reference standard, showed an average discrepancy (error rate) of approximately 5.643%. In terms of control performance, the average response time (latency) for appliance shutdown commands was found to be in the range of 38.50 − 51.33 seconds, primarily due to the LoRaWAN Class A communication protocol limitations. However, it should be noted that the ACS712-30A sensor for each sub-load may have varying tolerance levels for the load's current, and transmitting the electrical control value may take more than one minute in certain cases.