Ratiometric photoelectrochemical (PEC) biosensors based on polarity reversal of photocurrent can effectively avoid false positive or negative signals. However, the two different sensing interfaces that generate two photocurrent signals with opposite polarities limit the detection accuracy, and the critical voltage cannot be dynamically adjusted based on varying detection conditions. To address the aforementioned issues, this work employs a surface defect engineering strategy to develop a PEC biosensor based on Fe-modified TiO2 nanorods (TiO2–Fe) with rich oxygen vacancies. From a single sensing interface of this sensor, the polarity of photocurrent can be reversed to obtain two signals, attributed to the new charge transfer pathway provided by oxygen vacancies. Furthermore, the critical voltage is modulated by adjusting Fe loading, electrolyte pH and light intensity, and the corresponding mechanism is elucidated based on semiconductor electrode kinetics. This sensor is successfully applied to the evaluation of glucose levels in human serum. It exhibits excellent accuracy for quantitative analysis with spike recoveries ranging from 96.02% to 103.26% and relative standard deviations between 0.61% and 2.53%.
Photoelectrochemical sensing within complex biochemical environments typically necessitates the simultaneous determination of multiple analytes, as single-parameter measurements provide limited information. However, most existing biosensing platforms encode analyte information within a single signal dimension, which...
Zi-Han Zhang, Yang Kang, Xuan Li et al.· ACS Applied Nano Materials· 0 citations
Conventional photoelectrochemical (PEC) systems typically rely on static semiconductor interfaces that merely translate biomolecular recognition into amplitude modulation of the pre-existing photocurrent, thus limiting their analytical robustness and self-validation capabilities. Herein, we report in situ ion-exchang...
Hao Cheng, Zhen Yang, Dan Yang et al.· Journal of the American Chem...· 0 citations
High-performance photoelectrochemical (PEC) sensors require efficient utilization of photogenerated holes at the semiconductor/electrolyte interface. However, the rational design of an efficient interlayer for directed hole transport remains challenging. Herein, a CoMn-layered double hydroxide (CoMn-LDH) hole transport...
To enable meaningful comparisons in solar fuel production, the energy conversion efficiency of photoelectrodes must be evaluated using standardized benchmarking protocols. For solar water splitting, the photocurrent density at a defined potential in a three-electrode configuration (e.g., 1.23 V vs. RHE for water oxid...
C. Robles, Ana Gutiérrez-Blanco, Laura Montañés et al.· ACS Measurement Science Au· 0 citations
Electrochromic smart windows (ECWs) have emerged as a promising technology for energy-saving applications in buildings, transportation, and aerospace. However, the reliance on external power sources limits their sustainability and operational flexibility. Although self-coloration/bleaching can be achieved by introducin...
Wen-Qi Wang, Qiang Chen, Wan-Fang Li et al.· Materials Horizons· 0 citations
The effects of anodization voltages (50 V and 80 V) on the morphological properties of TiO2 nanotube arrays and their NO2 gas sensing performance are investigated. The thin films are synthesized using the electrochemical anodization method and characterized via energy dispersive X-ray spectroscopy (EDX), atomic force m...
M. F. A. Alias, Z. R. Muslim, Zina A. Al Shadidi et al.· Experimental and Theoretical...· 0 citations
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