Abstract
A novel generator–collector dual-plate boron-doped diamond microtrench sensor is fabricated and its operation demonstrated for chloride/chlorine detection in the harsh anodic potential range. Detection is made sensitive by minimising the inter-electrode gap to ≤10μm wide and setting the generator and collector potentials to enable repetitive redox cycling. The concentration and potential-dependant impact on the generator and collector currents are reported and optimised conditions suitable for quantitative determination are demonstrated. The diffusional redox cycling currents for chloride in buffer solution are kinetically controlled and first order over a concentration range of 1 to 140mM.
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