Cu2O-BiOI isotype (p-p) heterojunction: Boosted visible-light-driven photoelectrochemical activity for non-enzymatic H2O2 sensing
Cu2O-BiOI isotype (p-p) heterojunction: Boosted visible-light-driven photoelectrochemical activity for non-enzymatic H2O2 sensing
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DOI：
10.1016/j.apsusc.2020.146434
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发表时间：
2020-08
影响因子：
6.7
通讯作者：
Yi Zhang;Qi Wang;Dongming Liu;Qian Wang;Tong Li;Zhou Wang
中科院分区：
文献类型：
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作者：
Yi Zhang;Qi Wang;Dongming Liu;Qian Wang;Tong Li;Zhou Wang
在Cu 2 O与BiOI的耦合基础上，通过简单的两步电沉积方法在室温下设计并合成了一种新型的同种型（p-p）异质结。通过扫描电子显微镜（SEM）、透射电子显微镜（TEM）、X射线衍射测量（XRD）和X射线光电子能谱（XPS）验证了其形貌、相组成和化学键合状态。优化后的Cu 2 O/BiOI杂化电极在可见光照射下表现出了增强的光电化学（PEC）H2 O2非酶传感性能，具有非常宽的线性范围（1.99 μM ~ 17.54 mM），高灵敏度（213.87 μA mM−1cm−2），以及低检测限（0.44 μM（S/N = 3））。该传感器具有良好的选择性、重复性和稳定性，并在真实的样品中验证了其可行性。从能带结构和p-p异质结的角度阐明了其光电化学传感机理。本研究为同种异质结在PEC生物传感中的应用提供了新的思路，并为食品、生物医学和环境分析中H2 O2的有效检测提供了一个有前景的非酶生物传感器平台。
A novel isotype (p-p) heterojunction, on the basis of Cu2O coupled with BiOI, has been designed and synthesized via a facile two-step electro-deposition approach at room temperature. The morphology, phase compositions and chemical bonding state were verified by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction measurements (XRD) and X-ray photoelectron spectra (XPS). The optimized Cu2O/BiOI hybrid electrode exhibited boosted photoelectrochemical (PEC) H2O2non-enzymatic sensing performance under visible light illumination, with a phenomenally broad linear range (1.99 µM ~ 17.54 mM), a high sensitivity of 213.87 µA mM−1cm−2, as well as a low detection limit of 0.44 µM (S/N = 3). Additionally, the sensor presented satisfying selectivity, repeatability, stability and its feasibility in real samples was corroborated. The photoelectrochemical sensing mechanism was clarified in the view of band structure and p-p heterojunction. Our work would enlighten the perspective research on the application of isotype heterojunction in PEC bio-sensing and provide a promising non-enzymatic biosensor platform for effective detection of H2O2in food, biomedical and environment analysis.