Fabrication of 3D Bi2O3-BiOI heterojunction by a simple dipping method: Highly enhanced visible-light photoelectrocatalytic activity

Abstract

Three-dimentional (3D) Bi 2 O 3-BiOI heterojunction was fabricated on the basis of Bi 2 O 3 film by a simple dipping method at room temperature. The as-prepared film samples were characterized by scanning electron microscope (SEM), high resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and UV-Vis DRS spectra. Results indicated that BiOI nanosheets with cross-flake arrays were formed via in situ etching and exchanging of Bi 2 O 3 layer by Iin KI aqueous solution, which grow around the residual Bi 2 O 3 particles to form 3D Bi 2 O 3-BiOI heterojunction. Liner sweep voltammetry (LSV), electrochemical impedance spectroscopy (EIS) Nyquist plots and incident monochromatic photon-to-current conversion efficiency (IPCE) indicated that easier generation, separation and transfer of photogenerated charges were achieved on the special 3D heterojunction. The photocurrent density of the 3D Bi 2 O 3-BiOI composite increased by 8.4 times relative to pure Bi 2 O 3 at 0.35 V vs. Ag/AgCl in 0.2 M Na 2 SO 4 aqueous solution under visible light irradiation. For the PEC degradation of phenol, the composite film also exhibited greatly enhanced activity. The calculated rate constant was 3.8 times that on pure Bi 2 O 3. Furthermore, good stability in long-time photocurrent and cyclic degradation of phenol can both be observed, indicating that the 3D Bi 2 O 3-BiOI film can be potentially applied in water oxidation and environmental remediation.

Enhanced Photocatalytic Activity toward Organic Pollutants Degradation and Mechanism Insight of Novel CQDs/Bi2O2CO3 Composite

“…The charge-transfer resistance (R3) of the prepared samples anode/electrolyte interface corresponds to the second semi-circle (middle frequency) [57]. Compared with Bi 2 O 2 CO 3 , the smaller charge transfer resistance could be obtained from CQDs/Bi 2 O 2 CO 3 using the smaller arc radius [58]. Thus, the performance of CQDs/Bi 2 O 2 CO 3 contributed to the fast transfer and effective separation of e − -h + pairs.…”

A Flower‐like Bismuth Oxide as an Efficient, Durable and Selective Electrocatalyst for Artificial N2 Fixation in Ambient Condition

“…The X‐ray photoelectron spectroscopy (XPS) spectrum of β‐Bi 2 O 3 in Bi 4 f and O 1s regions are shown in Figure . In the Bi 4 f region (Figure a), the peaks at binding energies (BEs) of 164.3 and 158.8 eV were attributed to Bi 4f 5/2 and Bi 4f 7/2 , respectively, demonstrating that Bi species existed in the forms of Bi (III) in sample ,. Figure b shows the XPS spectrum in O 1s region, and the peak at 529.7 eV could be assigned to the lattice oxygen of Bi−O bonds, and other peak at BEs of 530.5 eV was indexed to the chemisorbed oxygen in the sample .…”

“…In the Bi 4 f region (Figure 2a), the peaks at binding energies (BEs) of 164.3 and 158.8 eV were attributed to Bi 4f 5/2 and Bi 4f 7/2 , respectively, demonstrating that Bi species existed in the forms of Bi (III) in sample. [32,33] Figure 2b shows the XPS spectrum in O 1s region, and the peak at 529.7 eV could be assigned to the lattice oxygen of BiÀ O bonds, and other peak at BEs of 530.5 eV was indexed to the chemisorbed oxygen in the sample. [34] In N 1s region ( Figure S1), no significant peaks were observed, possibly due to the decomposition of polyvinylpyrrolidone at the high annealing temperature of 400°C.…”

Recent Advances in Bismuth‐Based Nanomaterials for Photoelectrochemical Water Splitting

“…The PEC performance has been investigated for ferroelectricm aterials that are mainly based on BiFeO 3 .However,very recently,the doubleperovskite Bi 2 FeCrO 6 ferroelectric materialh as been demonstrated as an efficient photocathode for reduction of hydrogen in water splitting. [171,172] An anoporous Bi 3 NbO 7 thin film with an arrow band gapo f2 .8 eV shows PEC activity as ap hotoanode for water splitting. Bi 2 FeCrO 6 exhibits ap hotocurrent up to À1.20 mA cm À2 .I ti sa lso noted that, similar to BiFeO 3 ,t he photocurrento fB i 2 FeCrO 6 can be enhancedb yn egative poling.…”

“…To overcome the limitations, heterojunctions and loading with co-catalysts have been investigated. [171,172] An anoporous Bi 3 NbO 7 thin film with an arrow band gapo f2 .8 eV shows PEC activity as ap hotoanode for water splitting. [173] Mixed metal oxidesi nt he form of BiM 2 AO 6 (M = Zn and Cu) have been investigated for PEC applications, as they have band gaps that fall in the visible-light region.T he challenge lies in the synthesis of apure phase by al ow-costing solutionp rocess.…”