An analyte sensor apparatus comprising: a working electrode comprising: a base substrate comprising a well; a platinum composition disposed in the well, wherein: the platinum composition is disposed in the well as a layer of electrodeposited platinum black comprising a central planar region having a first thickness and an edge region having a second thickness that surrounds the central planar region; the average thickness of the platinum black layer in the edge region is less than twice the average thickness of the platinum black layer in the central planar region and the platinum black has been deposited by a method using a plurality of electric current pulses; the central planar region and the edge region comprise platinum dendrites; and the layer of electrodeposited platinum black forms an electroactive surface of the electrode; an analyte sensing layer disposed over the working electrode, wherein the analyte sensing layer detectably alters the electrical current at the working electrode in the presence of an analyte; and an analyte modulating layer disposed over the analyte sensing layer, wherein the analyte modulating layer modulates the diffusion of analyte therethrough; wherein: the well comprises a lip surrounding the well; and the edge region of the platinum black composition is below the lip of the well; and: the average thickness of the platinum black layer in the central planar region is between 1 μm and 10 μm. a working electrode comprising: a base substrate comprising a well; a platinum composition disposed in the well, wherein: the platinum composition is disposed in the well as a layer of electrodeposited platinum black comprising a central planar region having a first thickness and an edge region having a second thickness that surrounds the central planar region; the average thickness of the platinum black layer in the edge region is less than twice the average thickness of the platinum black layer in the central planar region and the platinum black has been deposited by a method using a plurality of electric current pulses; the central planar region and the edge region comprise platinum dendrites; and the layer of electrodeposited platinum black forms an electroactive surface of the electrode; a base substrate comprising a well; a platinum composition disposed in the well, wherein: the platinum composition is disposed in the well as a layer of electrodeposited platinum black comprising a central planar region having a first thickness and an edge region having a second thickness that surrounds the central planar region; the average thickness of the platinum black layer in the edge region is less than twice the average thickness of the platinum black layer in the central planar region and the platinum black has been deposited by a method using a plurality of electric current pulses; the central planar region and the edge region comprise platinum dendrites; and the layer of electrodeposited platinum black forms an electroactive surface of the electrode; the platinum composition is disposed in the well as a layer of electrodeposited platinum black comprising a central planar region having a first thickness and an edge region having a second thickness that surrounds the central planar region; the average thickness of the platinum black layer in the edge region is less than twice the average thickness of the platinum black layer in the central planar region and the platinum black has been deposited by a method using a plurality of electric current pulses; the central planar region and the edge region comprise platinum dendrites; and the layer of electrodeposited platinum black forms an electroactive surface of the electrode; an analyte sensing layer disposed over the working electrode, wherein the analyte sensing layer detectably alters the electrical current at the working electrode in the presence of an analyte; and an analyte modulating layer disposed over the analyte sensing layer, wherein the analyte modulating layer modulates the diffusion of analyte therethrough; wherein: the well comprises a lip surrounding the well; and the edge region of the platinum black composition is below the lip of the well; the well comprises a lip surrounding the well; and the edge region of the platinum black composition is below the lip of the well;