A proton-conducting solid state H2S–O2 fuel cell: 2. Production of liquid sulfur at 120–145°C

A proton-conducting solid state H2S–O2 electrochemical cell has been operated at 120–145°C and 235–510 kPa continuously for extended periods, in both fuel cell and electrolysis modes. In fuel cell mode, the products are liquid sulfur, steam and electrical power. Operation at elevated pressures enables the Nafion membrane to remain moist. Anode catalysts Pd/C, Pt/C, Pd–Pt/C and MoS2, admixed with 35% Teflonized carbon, are each stable and durable. Sulfur does not block or poison anode catalyst sites. The membrane is impervious to H2S.