Enhanced Photoelectrochemical Performance of CoOOH/ZnCdS-Vs Via Co-Catalyst and Defect Engineering for Detection of Cu²⁺and D-penicillamine AITranslate

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Chinese Library Classification Number:O657.1[理学];TP212[理学—分析化学]

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In this work,a CoOOH/ZnCdS-Vs sensor with high photoelectrochemical(PEC)performance was successfully developed through a heterojunction design and defect engineering.An S-type heterojunction was formed by the composite of the cocatalyst CoOOH and ZnCdS and the introduction of sulfur vacancies by annealing,which regulated the strength of Zn-S and Cd-S bonds and promoted a charge transfer.The two synergistically endowed CoOOH/ZnCdS-Vs with the highest photocurrent density of 11.17 mA/cm²at 1.23 V versus the reversible hydrogen electrode(vs.RHE).Subsequently,it was used to fabricate a PEC sensor for the continuous detection of Cu²⁺and D-penicillamine(D-PA).Due to the transfer of photogenerated electron-hole pairs,Cu²⁺was reduced to Cu⁺and Cu⁰and formed a new CoOOH/ZnCdS/Cu₂S heterojunction,resulting in a decrease in photocurrent density.But the introduction of D-PA restored the photocurrent density because its mercapto and amino groups formed a more stable five-membered ring chelate with Cu⁺.The fabricated PEC sensor exhibited an excellent selectivity,and there was no significant attenuation in photocurrent after 15 days of storage at room temperature.The limits of detection for Cu²⁺and D-PA were 0.12 nM and 1.26μM,respectively.