期刊
ACS APPLIED MATERIALS & INTERFACES
卷 11, 期 29, 页码 25702-25707出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b07523
关键词
semiconductor; cathode; enzyme; 3D; Cu2O; TiO2; O-2-independent
资金
- Science and Technology Ministry of China [2016YFA0201200]
- National Natural Science Foundation of China [21327902, 21675080]
- Natural Science Foundation of Jiangsu Province [BK20170073]
- Scientific Research Foundation of the Graduate School of Nanjing University [2018CL02]
This work reports the innovative design and application of a three-dimensional (3D) TiO2@Cu2O@nickel foam electrode synergized with enzyme catalysis toward the proof-of-concept study for oxygen-independent photocathodic enzymatic detection. Specifically, a 3D-nanostructured photo electrode has great potential in the semiconductor-based photoelectrochemical (PEC) biological analysis. On the other hand, using various photocathodes, cathodic PEC bioanalysis, especially the photocathodic enzymatic detection, represents an attractive frontier in the field. Different from state-of-the-art photocathodic enzymatic studies that are oxygen-dependent, herein, we present the ingenious design, characterization, and implementation of 3D TiO2@Cu2O@nickel foam photocathodes for the first oxygen-independent example. In such a configuration, the Cu2O acted as the visible-light absorber, while the TiO2 shell would simultaneously function as a protective layer for Cu2O and as a desirable substrate for the immobilization of enzyme biomolecules. Especially, because of the proper band positions, the as-designed photocathode exhibited unique O-2-independent PEC property. Exemplified by glucose oxidases, the as-developed sensor exhibited positive response to glucose with good performance. Because various oxidases could be integrated with the system, this protocol could serve as a universal O-2-independent platform for many other targets. This work is also anticipated to catalyze more studies in the advanced 3D photoelectrodes toward innovative enzymatic applications.
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