Binder-integrated Bi/BiOI/TiO2 as an anti-chloride corrosion coating for enhanced photocathodic protection of 304 stainless steel in simulated seawater

(001)-TiO2 nanosheets loaded on BiOI improve carrier separation and enhance the photocatalytic activity

“…7(b) shows the Kubelka–Munk curves of (001)-TiO 2 , BiOI, and TB2, the following equation can be used to calculate the band gap energies of the samples: 35 αhν = A ( hν − E g ) n /2 where α , h , ν , E g , and A are the absorption coefficients, the Planck constant, the frequency of the light, the band gap of the samples, and the constant, respectively. 36 According to the calculation results, the band gap energies of (001)-TiO 2 , BiOI, and TB2 were 3.1 eV, 1.7 eV, and 1.76 eV, respectively. The increased photocatalytic activity of the samples was a direct result of the broadened light absorption range.…”

In2S3@TiO2/In2S3 Z-Scheme Heterojunction with Synergistic Effect for Enhanced Photocathodic Protection of Steel

“…As a hole scavenger, Na 2 S and Na 2 SO 3 can effectively trap the photogenerated holes that arrive at the surface. According to the previous reports [ 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 ], the charge separation efficiency can be calculated by the equation: ( ), and the results are exhibited in Figure S2b . J abs represents the photocurrent density converted from the absorbed photons, and J HS is the photocurrent densities measured in 0.15 M Na 2 S + 0.1 M Na 2 SO 3 solution.…”

“…As a hole scavenger, Na 2 S and Na 2 SO 3 can effectively trap the photogenerated holes that arrive at the surface. According to the previous reports [6][7][8][9][10][11][12][13][14][15][16][17][18], the charge separation efficiency can be calculated by the equation: (η sep = J HS J abs ), and the results are exhibited in Figure S2b.…”

“…Since the report of photoelectrochemical cathodic protection of copper using TiO 2 by Yuan and Tsujikawa in 1995 [5], titanium dioxide (TiO 2 ), one of the most important n-type semiconductors, has been widely investigated due to its efficient photocatalytic properties, good stability, low toxicity, and cost-effectiveness. A series of TiO 2 -based photoanodes have been fabricated and applied in photocathodic protection for metals [6][7][8][9]. However, because of low light-harvesting efficiency, the high recombination efficiency of photogenerated carriers, and an insufficiently negative Fermi level, developing a highly efficient semiconductor photoanode for photoelectrochemical cathodic protection on metals remains a significant challenge [10,11].…”

Oxidized Graphitic-C3N4 with an Extended π-System for Enhanced Photoelectrochemical Property and Behavior

“…The inset in the Nyquist plots exhibits the equivalent circuit model with a two-time constant used for the plot fitting, and the fitting data are listed in Table 2. In the equivalent circuit of the Nyquist plots [34,35], R s represents the series resistance, R f refers to the film resistance, R ct is the charge transfer resistance, and CPE 1 and CPE 2 represent the constant phase elements. The constant phase element (CPE) can be expressed by the equation CPE = 1 Y 0 (jw) n , where Y 0 and n represent the admittance magnitude of the CPE and the exponential term (0 < n ≤ 1), respectively; ω is the angular frequency in rad s −1 (ω = 2πf ); and j 2 = −1 is an imaginary number [36,37].…”