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The first example of metal ions sensing based on self-operating photocathode is demonstrated. Lead ion (Pb2+) induces the allosteric transition of K+-stabilized G-quadruplex intercalated with hemin, which releases hemin to sensitize the p-type NiO electrode, forming the self-operating photocathode. The cathodic photocurrent linearly increases with the concentration of Pb2+ in the range of 20 to 1500nM...
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