Gao Jie, He Dong, Zhang Jingwen, Sun Bangning, Wang Guanda, Suo Hui, Zhang Liang, Zhao Chun
State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun, 130000, PR China.
College of Chemistry and Materials Engineering, Bohai University, Jinzhou, 121013, PR China.
Anal Chim Acta. 2023 Oct 2;1276:341645. doi: 10.1016/j.aca.2023.341645. Epub 2023 Jul 20.
Preconcentration can effectively enhance the detection performance of electrodes in the electrochemical detection of heavy metal ions, but it also presents challenges for real-time monitoring. Several attempts have been made to optimize preconcentration by improving the adsorption capacity or detection mechanism of the electrode. The valence transfer of tungsten oxide between W/W can participate in the reduction between the electrode material and heavy metal ions, playing a role in preconcentration to some extent. Therefore, we developed a WO/SSM electrochemical sensor for the detection of Cu(II) that utilizes the valence variation property of WO. The crystallinity and microstructure of the WO/SSM electrode can be regulated by controlling the deposition parameters, and we prepared three types of WO/SSM with different morphologies to identify the influence of the electrochemical effective surface area. The proposed electrode shows high performance as a Cu(II) sensor under short preconcentration time (60 s), with an excellent sensitivity of 14.113 μA μM cm for 0.1-10.0 μM and 4.7356 μA μM cm for 10.0-20.0 μM. Overall, the combined effect of morphology and valence transfers shortens the preconcentration time and optimizes preconcentration while ensuring excellent electrode performance. This WO/SSM electrode is expected to drive great advances in the application of tungsten oxide in the electrochemical detection of heavy metal ions.
