Photoelectroanalytical Oxygen Detection with Titanate Nanosheet Platinum Hybrids Immobilised into a Polymer of Intrinsic Microporosity

TL;DR

This study develops a microporous polymer-immobilized titanate nanosheet platinum hybrid for photoelectrochemical oxygen detection, demonstrating light-controlled oxygen reduction and potential analytical applications.

Contribution

It introduces a novel hybrid material combining titanate nanosheets, platinum, and a microporous polymer for light-controlled oxygen sensing.

Findings

Oxygen reduction can be switched off with pulsed blue LED light.

Photoelectrochemical responses depend on light intensity and oxygen levels.

Preliminary data suggest potential for electroanalytical applications.

Abstract

The polymer of intrinsic microporosity PIM 1 is employed to disperse and deposit a Pt at titanate nanosheet photocatalyst film. The resulting microporous films allow electrolyte and oxygen permeation to give conventional oxygen reduction voltammetric responses on glassy carbon or on platinum disk electrodes in the dark. Preliminary data are presented showing that with pulsed light from a blue LED oxygen reduction at the electrode is effectively switched off. A mechanism is tentatively assigned as photocatalytic depletion of oxygen near the electrode. Photoelectrochemical current responses are observed in aqueous NaOH, NaCl, Na2HPO4 and shown to be light intensity and oxygen concentration dependent. Electroanalytical applications are suggested.