초록 ▼

The invention relates to an electrochemical cell having an electrode with a catalyst layer and a gas diffusion layer. The cell also includes a mass flow field for directing fluid to and away from the electrode. An additional gas diffusion layer is disposed between the gas diffusion layer and the flo

The invention relates to an electrochemical cell having an electrode with a catalyst layer and a gas diffusion layer. The cell also includes a mass flow field for directing fluid to and away from the electrode. An additional gas diffusion layer is disposed between the gas diffusion layer and the flow field. This increases the diffusion resistance of the fluid. The electrochemical cell of the present invention is particularly useful in a process for electrochemically converting anhydrous hydrogen halide to essentially dry halogen gas, where it is necessary to control and increase limiting current. It is also possible to use the additional gas diffusion layer in an aqueous process electrochemical cell.

대표청구항 ▼

[ What is claimed is:] [1.] An electrochemical cell for directly producing essentially dry halogen gas from essentially anhydrous hydrogen halide, comprising:(a) means for oxidizing molecules of essentially anhydrous hydrogen halide to produce essentially dry halogen gas and protons;(b) cation-trans

[ What is claimed is:] [1.] An electrochemical cell for directly producing essentially dry halogen gas from essentially anhydrous hydrogen halide, comprising:(a) means for oxidizing molecules of essentially anhydrous hydrogen halide to produce essentially dry halogen gas and protons;(b) cation-transporting means for transporting the protons therethrough, wherein one side of the cation-transporting means is disposed in contact with one side of the oxidizing means;(c) means for reducing the transported protons, wherein one side of the reducing means is disposed in contact with the cation-transporting means and the reducing means has a compartment for containing a fluid therein;(d) a mass flow field disposed on the other side of the reducing means for directing fluid to and away from the reducing means; and(e) means disposed between the reducing means and the mass flow field for increasing the diffusion resistance of the fluid.