Boundaries can steer active Janus spheres. Looks at Catalytic conductor-insulator Janus swimmers. Note that the method of mirror images used in the paper for estimating effects of some rotational diffusion quenching mechanisms is not the same as used for electrostatic charges near a conductor. It is in fact an instance of the method of mirror images, as applied to Diffusion equations, where the image is used to satisfy the no-slip boundary condition in the current $J$ of ions. As the current satisfies $J=\sigma E$ from Ohm's law, the effect on currents should have an accompanying effect on the Electric field.