A high efficiency vertical axis wind turbine includes an optimized blade shape for increased torque output. The characteristics thereof are that between the bearing and the capsule is an auxiliary circulating channel for cooling that has a convection effect for cooling at both the interior and exterior of the bearing without increasing the fluid leakage thereof, thereby preventing high temperatures from dry running of the pump. The electrode has excellent chemical resistance and is fitted to be applied in a solar cell device with enhanced sun-light absorbing ability.