Help with building a potentiostat

Hi all

I am working on a project to build the electronic interface for an electrochemical cell.
It is a three electrode system. Now i have to build a potentiostat for it. After doing some reading i found the following circuit.

I wired the circuit but the output of op2 remains constant at -4.43v while i change vin and even when in did not apply any input.

please help me analyze the circuit, and i am not even quite sure how to test it.

any suggestions would be really helpful.

thanks