Scholarlink

<p>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 co-catalyst 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&#xa0;mA/cm<sup>2</sup> at 1.23&#xa0;V versus the reversible hydrogen electrode (vs. RHE). Subsequently, it was used to fabricate a PEC sensor for the continuous detection of Cu<sup>2+</sup> and D-penicillamine (D-PA). Due to the transfer of photogenerated electron-hole pairs, Cu<sup>2+</sup> was reduced to Cu<sup>+</sup> and Cu<sup>0</sup> and 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<sup>+</sup>. 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 Cu<sup>2+</sup> and D-PA were 0.12 nM and 1.26 µM, respectively.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

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

  • 期刊论文

  • 发表日期：

    2025年8月29日

查看全文
  • Yanli Zhou,
  • Ling Deng,
  • Hongdu Qing,
  • Songlian Li,
  • Kang Li

摘要

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 co-catalyst 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/cm2 at 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 Cu0 and 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 1.26 µM, respectively.