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function [z]=ecm1wr(R0,R1,C1,RL,L,A,f)
% This function calcultes the impedance of first order of equivalent
% circuit model include Warburg diffusion element.
% Model: R0-(RL||L)-(R||C)-W
% R0: material, connection, electrolyte resistance
% R: charge transfer resistance
% C: equalent capacitance
% L: inductance
% f: experimental frequency
% example: R0=1; R1=1; C1=0.1; L=0.0001; RL=1; A=1; f=logspace(-2,3)
w=freq(f)
zr=res(w,R1)
zrl=res(w,RL)
zc=cap(w,C1)
zl=ind(w,L)
zw=war(w,A)
z=R0+1./(1./zrl+1./zl)+1./(1./zr+1./zc)+zw
plot(real(z),-imag(z),'x')
xlabel('Re_Z(Ohm)')
ylabel('Im_z(Ohm)')
title('Nyquist plot')
end

function w=freq(f)
% transform f to w
w=2*pi*f
end

function zc=cap(w,C)
% capacitance
zc=1./(j*w*C)
end

function zl=ind(w,L)
% inductance
zl=j*w*L
end

function zw=war(w,A)
% Warburg element
% A: Warburg coefficient
zw=A*(1./w.^(1/2)+1./(j*w.^(1/2)))
end

function zr=res(w,R)
% Resistance
zr=R*ones(size(w))
end

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