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Can someone helps me to solve the error in this code?

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Muhamed
Muhamed 2024-1-26
评论： Walter Roberson 2024-1-26
Ran in:
il = 4;
R = 8.314;
F = 96485;
Alpha = 0.5;
n = 2;
Eexc = 53990.065;
sigma_ref = 0.020;
Epro = 18912.42;
delta = 7*2.54*10^-3;
I = 0:50:350;
for i = 1:length(I)
t=0;
for T = [313 333 353]
t=t+1;
% Anode
ia = (10^-7)(exp(-(Eexc/R)((1/T)-(1/298))));
Invalid expression. When calling a function or indexing a variable, use parentheses. Otherwise, check for mismatched delimiters.
Eta_Anode(i,t) = ((R*T)/(Alpha*n*F))*(log(I(i)/ia));
% Cathode
ic = (10^-3)(exp(-(Eexc/R)((1/T)-(1/353))));
Eta_Cathode(i,t) = -((R*T)/(Alpha*n*F))*(log(I(i)/ic));
%Ohmic
sigma(i,T) = sigma_ref*(exp(-(Epro/R)*((1/T)-(1/298))));
Rohm = delta/sigma(i,T);
Eta_Ohmic(i,t) = I(i)*Rohm;
%Concentration
Eta_Conc(i,t) = ((R*T)/(Alpha*n*F))*(log(il/(il-I(i))));
%Voltage
H_h2(i,T)=0+(28.84*(T-298));
H_o2(i,T)=0+(28.91*(T-298));
H_h2o(i,T)=-285830+(75.37*(T-298));
H(i,T)=H_h2(i,T)+(0.5*H_o2(i,T))-H_h2o(i,T);
S_h2(i,T)=130.68+(28.84*(log(T/298)));
S_o2(i,T)=205+(28.91*(log(T/298)));
S_h2o(i,T)=69.95+(75.37*(log(T/298)));
S(i,T)=S_h2(i,T)+(0.5*S_o2(i,T))-S_h2o(i,T);
G(i,T)=H(i,T)-(T*S(i,T));
E(i,T)=(G(i,T)/(2*F));
ET(i,t) = 1.5184-(1.5421*10^-3*T)+(9.523*10^-5*T*log(T))+(9.84*10^-8*T^2);
EP(i,t)= 1.23+(((R*T)/(n*F))*(log(0.5*0.5^0.5)));
VT(i,t) = ET(i,t) + Eta_Anode(i,t) - Eta_Cathode(i,t) + Eta_Ohmic(i,t) + Eta_Conc(i,t);
VP(i,t) = EP(i,t) + Eta_Anode(i,t) - Eta_Cathode(i,t) + Eta_Ohmic(i,t) + Eta_Conc(i,t);
V(i,t) = E(i,t) + Eta_Anode(i,t) - Eta_Cathode(i,t) + Eta_Ohmic(i,t) + Eta_Conc(i,t);
%Mass Flow Rate
A(i) = I(i)* 50;
M_H2(i) = (A(i)*0.99)/(2*F);
M_O2(i) = (A(i)*0.99)/(4*F);
M_H2O(i) = (A(i)*0.99)/(2*F);
disp (['At Current = ',num2str(I(i)),'A',', Mass Flow Rate of H2 = ', num2str(M_H2(i)),' mol/s',', Mass Flow Rate of O2 = ', num2str(M_O2(i)),' mol/s',', Mass Flow Rate of H2O = ', num2str(M_H2O(i)),' mol/s']);
end
end
figure(1);
plot (I,V(:,1),I,V(:,2),I,V(:,3),I,V(:,4),I,V(:,5),I,V(:,6))
legend('T=25','T=40','T=56','T=64','T=55','T=48')
xlabel('Current Density (A/cm2)');
ylabel('Cell Voltage (Volt)');
title('I-V Curve (General Equation of E reversible)');
figure(2);
plot (I,VP(:,1),I,VP(:,2),I,VP(:,3),I,VP(:,4),I,VP(:,5),I,VP(:,6))
legend('T=25','T=40','T=56','T=64','T=55','T=48')
xlabel('Current Density (A/cm2)');
ylabel('Cell Voltage (Volt)');
title('I-V Curve (Pressure & Temperature variation)');
figure(3);
plot (I,VT(:,1),I,VT(:,2),I,VT(:,3),I,VT(:,4),I,VT(:,5),I,VT(:,6))
legend('T=25','T=40','T=56','T=64','T=55','T=48')
xlabel('Current Density (A/cm2)');
ylabel('Cell Voltage (Volt)');
title('I-V Curve (Temperature variation)');
figure(4);
plot(I,M_H2(:),I,M_H2(:),I,M_H2(:),I,M_H2(:),I,M_H2(:),I,M_H2(:))
xlabel('Current Density (A/cm2)');
ylabel('Molar Flow Rate (mol/s)');
title('Current vs Molar Flow Rate of H2');
figure(5);
plot(I,Eta_Anode(:,1),I,Eta_Anode(:,2),I,Eta_Anode(:,3),I,Eta_Anode(:,4),I,Eta_Anode(:,5),I,Eta_Anode(:,6),I,Eta_Cathode(:,1),I,Eta_Cathode(:,2),I,Eta_Cathode(:,3),I,Eta_Cathode(:,4),I,Eta_Cathode(:,5),I,Eta_Cathode(:,6),I,Eta_Ohmic(:,1),I,Eta_Ohmic(:,2),I,Eta_Ohmic(:,3),I,Eta_Ohmic(:,4),I,Eta_Ohmic(:,5),I,Eta_Ohmic(:,6),I,Eta_Conc(:,1),I,Eta_Conc(:,2),I,Eta_Conc(:,3),I,Eta_Conc(:,4),I,Eta_Conc(:,5),I,Eta_Conc(:,6))
legend('T=25','T=40','T=56','T=64','T=55','T=48')
xlabel('Current Density (A/cm2)');
ylabel('Overpotential (Volt)');
title('Different Overpotential');
figure(6);
plot(I,Eta_Anode(:,1),I,Eta_Anode(:,2),I,Eta_Anode(:,3),I,Eta_Anode(:,4),I,Eta_Anode(:,5),I,Eta_Anode(:,6))
xlabel('Current Density (A/cm2)');
ylabel('Overpotential (Volt)');
title('Activation Anode Overpotential');
figure(7); plot(I,Eta_Cathode(:,1),I,Eta_Cathode(:,2),I,Eta_Cathode(:,3),I,Eta_Cathode(:,4),I,Eta_Cathode(:,5),I,Eta_Cathode(:,6))
xlabel('Current Density (A/cm2)');
ylabel('Overpotential (Volt)');
title('Activation Cathode Overpotential');
figure(8); plot(I,Eta_Ohmic(:,1),I,Eta_Ohmic(:,2),I,Eta_Ohmic(:,3),I,Eta_Ohmic(:,4),I,Eta_Ohmic(:,5),I,Eta_Ohmic(:,6))
xlabel('Current Density (A/cm2)');
ylabel('Overpotential (Volt)');
title('Ohmic Overpotential');
figure(9); plot(I,Eta_Conc(:,1),I,Eta_Conc(:,2),I,Eta_Conc(:,3),I,Eta_Conc(:,4),I,Eta_Conc(:,5),I,Eta_Conc(:,6))
xlabel('Current Density (A/cm2)');
ylabel('Overpotential (Volt)');
title('Concentration Overpotential');

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回答（2 个）

Torsten
Torsten 2024-1-26
编辑：Torsten 2024-1-26
You mean
ia = (10^-7)*(exp(-(Eexc/R)*((1/T)-(1/298))));
ic = (10^-3)*(exp(-(Eexc/R)*((1/T)-(1/353))));
instead of
ia = (10^-7)(exp(-(Eexc/R)((1/T)-(1/298))));
ic = (10^-3)(exp(-(Eexc/R)((1/T)-(1/353))));
?
And the second dimension of V, VP, VT, Eta_anode,... is only 3, not 6, so that you will get a dimension error in the plots.
Dyuman Joshi
Dyuman Joshi 2024-1-26
There are missing operators at many places in your code, e.g. -
% vv vv
ia = (10^-7)(exp(-(Eexc/R)((1/T)-(1/298))));
% vv vv
ic = (10^-3)(exp(-(Eexc/R)((1/T)-(1/353))));
Use appropriate operators and this issue will be resolved.
  2 个评论
Dyuman Joshi
Dyuman Joshi 2024-1-26
Additionally, V is 8x3 where as you trying to access the 4th, 5th and 6th column of it, which don't exist.
Same for VT and VP.
I suggest you go through your code thoroughly once and check each line.

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