Nonstationary Diffusion Under Galvanostatic Conditions

define the initial and boundary conditions. Initially, just like under poten-tiostatic conditions, Cox x, 0) = C qx- relationship describing the electroly- 

Equation (5.19) represents the boundary condition for this problem. Another condition sets the limits of diffusion area Cox(oo,f) = C qx- Let s define the function Cox(x,t). 

It has been previously shown that the second Pick s law can be transformed into an ODE with a general solution (5.14). The integration constants can be defined similarly. One of the boundary conditions requires C2 = 0 otherwise, we would have an infinitely large right-hand part of (5.14) whenx— 00. Therefore  

Inverse Laplace transform gives the sought function Cox x, t) (Fig. 5.11). Consequently, 

03 range of dls nces from a surface, cm Fsraday constant, C/mol F 96435 

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