Effect of H_2S Flow Rate and Concentration on Performance of H_2S/Air Solid Oxide Fuel Cell

摘要

A solid state H_2S/air electrochemical cell having the configuration of H_2S, (MoS_2+NiS+Ag)/YSZ/Pt, air has been examined with different H_2S flow rates and concentrations at atmospheric pressure and 750―850 ℃. Performance of the fuel cell was dependent on anode compartment H_2S flow rate and concentration. The cell open-circuit voltage increased with increasing H_2S flow rate. It was found that increasing both H_2S flow rate and H_2S concentration improved current-voltage and power density performance. This is resulted from improved gas diffusion in anode and increased concentration of anodic electroactive species. Operation at elevated H_2S concentration improved the cell performance at a given gas flow rate. However, as low as 5% H_2S in gas mixture can also be utilized as fuel feed to cells. Highest current and power densities, 1750mA·cm~(-2) and 200mW·cm~(-2), are obtained with pure H_2S flow rate of 50ml·min~(-1) and air flow rate of 100ml·min~(-1) at 850℃.