Graphitic carbon nitride with photo-attached platinum nanoparticles of typically 2.5 nm diameter, Pt@g-C3N4, is known for photo-generation of hydrogen in aqueous environments and in the presence of hole quenchers. Here, the generation of photo-currents from photo-hydrogen production is observed at a platinum electrode, driven by oxalate or glucose hole quenchers, and enhanced with the polymer of intrinsic microporosity PIM-1 coated over the Pt@g-C3N4 deposit. The ability of PIM-1 to create triphasic conditions and to capture hydrogen leads to enhanced photo-current responses even in the presence of ambient oxygen. Effects are discussed in terms of triphasic solid | liquid | hydrogen gas based electrode processes. A glucose concentration dependent (super-Langmuirian) photoresponse is observed. Possible applications are proposed in glucose sensing and in hydrogen-mediated photovoltaics.