Abstract: An electrode comprising a functionalized surface exposable to a fluid sample. The functionalized surface comprises at least one polymer capable of mediating a salting-out effect and at least one detection agent that binds to an analyte comprised in the fluid sample, wherein the polymer and the detection agent are distributed on the surface of the electrode such that the detection agent is present in essentially equal amounts per surface area throughout the electrode surface and the polymer is arranged around the detection agent present in an amount allowing the reduction of the ionic strength of the fluid in proximity to the detection agent, and allowing for binding an analyte comprised in the fluid sample. A method for manufacturing a functionalized surface on an electrode, an analyte detector comprising the electrode, and the use of the analyte detector for determining at least one analyte in a fluid sample are also provided.