Method for removing pentavalent antimony contaminants in water and fuel cell

A fuel cell, comprising:

• a reactor, wherein a water inlet for passing waste water containing pentavalent antimony contaminants to be treated is arranged at a lower part of the reactor;
• a water outlet for discharging the treated waste water is arranged at an upper part of the reactor;
• an iron anode is arranged in the reactor;
• a through hole is provided in a side wall of the reactor;
• a cathode for restoring oxygen by utilizing electrons and protons is sealed and inlaid in the through hole;
• and a resistor is connected between the iron anode and the cathode in series;
• the inside of the reactor is under anaerobic condition;
• the cathode comprises a catalyst layer, a current collection material layer, a carbon-based layer and a diffusion layer sequentially arranged from an inner side of the cathode to an outer side of the cathode;
• the diffusion layer is in contact with an outside air, and the catalyst layer is in contact with the waste water in the reactor.