Three-electrode reactor and application thereof

The invention provides a three-electrode reactor; the three-electrode reactor is good in whole sealing property, and is capable of effectively avoiding permeation of outside air or leakage of internal gas, thus guaranteeing the reliability of a gas yield result and realizing preparation of high-purity H2; the three-electrode reactor not only can be externally connected with an electrochemical workstation or an ampere-voltage meter, but also is capable of cleaning the gas in the reactor and sampling the produced gas, thus realizing synchronous photoelectrochemical behavior and gas yield analysis of a water photoelectrolysis process; therefore, the inherent photoelectrochemical mechanism of a water photoelectrolysis system is deeply explored, and the water photoelectrolysis efficiency is evaluated.