This product is designed as a controllable temperature photovoltaic reactor for photoelectrochemical research, combining a glass cell with a detachable quartz window (24 mm diameter) for optical access. It features a water-bath temperature control system and a fully sealed three-electrode configuration, enabling precise and stable measurements under controlled conditions. The quartz plate is replaceable, and the ion membrane can be quickly exchanged, facilitating flexible experimental setups. Available in 50 ml, 100 ml, and 150 ml capacities with two-neck (K011) or three-neck (K010) port options, it supports a range of applications in energy materials, experimental materials, and analytical electrode studies. This reactor is suited for photoelectrocatalysis, photovoltaics, and electrochemical characterization where reliable sealing and thermal management are required.