Nanoprecipitated CoPi enhanced photoelectrochemical water oxidation toward sensitive and selective Co2+ detection

Yuhuan Wang; Jianyu Qiao; Shuqing Dong; Shijun Shao; Dengchao Wang

doi:10.1016/j.jhazmat.2023.132003

Nanoprecipitated CoPi enhanced photoelectrochemical water oxidation toward sensitive and selective Co²⁺ detection

J Hazard Mater. 2023 Sep 15:458:132003. doi: 10.1016/j.jhazmat.2023.132003. Epub 2023 Jul 5.

Authors

Yuhuan Wang¹, Jianyu Qiao¹, Shuqing Dong², Shijun Shao³, Dengchao Wang⁴

Affiliations

¹ CAS Key Laboratory of Chemistry of Northwestern Plant Resources and Key Laboratory for Natural Medicine of Gansu Province, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China; University of Chinese Academy of Sciences, Beijing 100049, China.
² CAS Key Laboratory of Chemistry of Northwestern Plant Resources and Key Laboratory for Natural Medicine of Gansu Province, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China.
³ CAS Key Laboratory of Chemistry of Northwestern Plant Resources and Key Laboratory for Natural Medicine of Gansu Province, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China. Electronic address: sjshao@licp.cas.cn.
⁴ University of Chinese Academy of Sciences, Beijing 100049, China. Electronic address: wangdengchao@ucas.ac.cn.

PMID: 37423138
DOI: 10.1016/j.jhazmat.2023.132003

Abstract

The detection of heavy metal ions Co²⁺ is of great significance to the environment and human health. Herein, a simple, highly selective and sensitive photoelectrochemical detection strategy for Co²⁺ was developed based on the enhanced activity by nanoprecipitated CoPi on the Au nanoparticle decorated BiVO₄ electrode. The new photoelectrochemical sensor has a low detection limit of 0.03 μΜ and wide detection range of 0.1-10, and 10-6000 μΜ, with a high selectivity over other metal ions. The Co²⁺ concentration in tap water and commercial drinking water has also been successfully determined with the proposed method. Scanning electrochemical microscopy technique was employed to characterize the photocatalytic performance and heterogenous electron transfer rate of electrodes in situ, further revealing the photoelectrochemical sensing mechanism. Besides determining Co²⁺ concentration, this approach of enhanced catalytic activity by nanoprecipitation can be further extended to develop a variety of electrochemical, photoelectrochemical and optical sensing platforms for many other hazardous ions and biological molecules.

Keywords: Cobalt ions sensing; Photoelectrochemistry; Signal-on; Water oxidation.