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With advantages such as high sensitivity,low limit of detection(LOD),easy to be operation,fluorescent nanomaterials with the unique optical and electronic properties based photoelectrochemical sensors are widely used these days [1].Compared to traditional quantum dots containing Cd or Pb ions,the fluorescent gold nanoclusters(AuNCs)are very hot topics because of low toxicity in fabrication processes and biological detection.In previous work [2],we built photoelectrochemical sensors with different AuNCs for detection of H2O2 without extra catalysts.However,because of low photoinduced charge separation efficiency,photocurrents from AuNCs based sensors were not high enough which deduced to low sensitivity and low LOD.