The large overpotential of the Polypyrrole film is interesting but generally ignored,in this paper,the formation theory of the large overpotential and surface microcosmic structure change of the film are studied systemically.

A method of quickly discerning and calculating electrofiltration potential and its application in low porosity and low permeability oilfield;

Experimental analysis of the effects of core permeability on formation electrofiltration potential;

Low spontaneous potential (SP) amplitude of thin and poor water flooded reservoir may be caused by several factors, such as thin layer, high shale content, influenced by residual hydrocarbon after water out and electrofiltration potential.

On the given solution composition and electro-deposition current and temperature, the influence of the electro-deposition time on the hydrogen evolution reaction overpotentials of the Ni-S alloy was analyzed.

In order to investigate the distribution of concentration, current density and overpotential in DMFC, a one-dimensional mathematic model including anode diffusion layer, anode catalyst layer, polymer electrolyte membrane, cathode catalyst layer and cathode diffusion layer is established.

0Pa,catalysis electrode films of NiFe,CoMo of HER prepared at different sputtering pressure,their crystal size and HER overpotential decreased with increasing of chamber pressure,and their overpotential and Tafel slope were changed sharply at 2.