A self-powered photoelectrochemical aptasensor based on dual-photoelectrode photofuel cell for chloramphenicol detection

Inspired by the power generation mechanism of photofuel cell (PFC), a sensitive chloramphenicol (CAP) detection method was developed through the dual-photoelectrode photoelectrochemical (PEC) aptasensor. Assisted with the localized plasma resonance effect (LSPR) of AuNPs, the three-dimensional (3D) graphite carbon nitride (g-C3N4) was acted as the photoanode to output high and stable photocurrent. The photocathode used porous metal organic framework (MOF) and Cu2O to form an N doped core-shell structure, which improved the aptasensor performance by co-participating in the photoresponse with the photoanode. The oxidation-reduction reaction together with the bias voltage of two electrodes completed a PFC system, which realized spontaneously power supply capability. In addition to the sensitivity, the selectivity, stability and repeatability of the as-fabricated device were also guaranteed, which was suitable for practical application. The novel PFC-based dual-photoelectrode PEC sensing system can be regarded as a potential method for antibiotics detection.