Z-scheme carbon-bridged Bi2O3/TiO2 nanotube arrays to boost photoelectrochemical detection performance

Rational Regulation of Surface Free Radicals on TiO2 Nanotube Arrays via Ag2O–AgBiO3 towards Enhanced Selective Photoelectrochemical Detection

“…Changes in surface electrochemical reactions deeply affect the active surface free radicals of photocatalysts in the PEC reactions, especially the two reactions in the PEC detection process: (1) the direct organics oxidation by holes and (2) the indirect organics oxidation by hydroxyl radicals formed by holes [ 22 , 25 , 45 , 46 ]. Therefore, the corresponding changes in photocurrents of the as-prepared electrodes were studied by adding the corresponding radical trapping agents in PEC measurements ( Figure 4 a–c).…”

“…The highly ordered TiO 2 NTAs were prepared by anodic oxidation, as previously reported [ 22 ]. In detail, the working electrode of the Ti sheet and the counter electrode of graphite were put together into an electrolytic cell at a distance of 2 cm.…”

“…Previous works have demonstrated the use of TiO 2 NTA-based photoanodes for organic pollutant degradation and renewable energy production [ 14 , 15 , 16 , 17 , 18 ], in which TiO 2 NTAs exhibit considerable performance due to their large surface area, high chemical and mechanical stability, oriented electron transport, and tunable morphologies [ 19 , 20 , 21 ]. Recently, inspired by the above-mentioned concept, detection sensors based on the PEC characteristic of TiO 2 NTAs for organics have been established [ 22 , 23 , 24 ] and are considered to be a potential method to replace and solve these issues in the traditional way. Nevertheless, in practical applications, the recombination of photogenerated charge pairs and the undesired selective oxidation severely limit the PEC detection of TiO 2 NTAs [ 22 , 25 ], where a large amount of energy from absorbed photons is lost because of heat and inefficient decomposition, resulting in low efficiency determination performance.…”

“…Recently, inspired by the above-mentioned concept, detection sensors based on the PEC characteristic of TiO 2 NTAs for organics have been established [ 22 , 23 , 24 ] and are considered to be a potential method to replace and solve these issues in the traditional way. Nevertheless, in practical applications, the recombination of photogenerated charge pairs and the undesired selective oxidation severely limit the PEC detection of TiO 2 NTAs [ 22 , 25 ], where a large amount of energy from absorbed photons is lost because of heat and inefficient decomposition, resulting in low efficiency determination performance. Several strategies including hydrogen treating, precious metals loading, and semiconductor modification have been developed to promote the charge separation of TiO 2 NTAs [ 19 , 23 ].…”

Enhanced Charge Transfer Process in Morphology Restructured TiO2 Nanotubes via Hydrochloric Acid Assisted One Step In‐Situ Hydrothermal Approach

“…[4] Until now, TiO 2 have reported as multi-dimensional photocatalyst in various applications under the energy and environmental fields with its existing wide band gap. [5,6] There have been various morphological modifications reported for TiO 2 , such as nanotube, [7] nanowire, [8] nanorods, [9] nanosheets, [10] microflowers [11] etc., via sol-gel, [12] hydrothermal synthesis, [13] molten salt, [14] and anodization methods, [15] etc., for different applications. [16,17] Among them, TiO 2 nanotube has a physically and chemically very stable structure, high surface area and pore volume, and excellent 3-dimensional structural characteristics and shows large reaction range.…”