Fabrication of Bi₂WO₆/Cu/WO₃ All‐Solid‐State Z‐Scheme Composite Photocatalyst to Improve CO₂ Photoreduction under Visible Light Irradiation

Abstract

Photocatalysis has been widely explored to alleviate the high atmospheric CO 2 content by converting CO 2 into energy-rich fuels. Bi 2 WO 6 shows great potential in photocatalysis due to its high chemical stability, non-toxicity and appropriate band position. However, the CH 4 yield from CO 2 photoreduction over bulk Bi 2 WO 6 is relatively low ascribed to its single-component structure. Inspired by natural photosynthesis, Z-scheme system with photosystem I (PS I)-photosystem II (PS II) coupling via an electron mediator can improve charge separation and at the same time, renders large overpotential, attributed to the vectorial electron transfer from PS II to PS I. In this contribution, an all-solid-state Z-scheme photocatalyst that is composed of 2D Bi 2 WO 6 nanosheets coupled with WO 3 along with the incorporation of copper foil sheet as the electron mediator is designed to improve the CO 2 reduction efficiency. The Bi 2 WO 6 / Cu/WO 3 composite demonstrated a remarkable CH 4 yield of 8.80 μmol g À 1 catalyst over 8 hours of visible light illumination, which is superior to the Bi 2 WO 6 standalone.[a] Y.

Single Ir Atoms Anchored on Ordered Mesoporous WO3 Are Highly Efficient for the Selective Catalytic Reduction of NO with CO under Oxygen‐rich Conditions

“…The XPS survey spectra in Figure 5a show the presence of Ir element in Ir 1 /m‐WO 3 , Ir NPs/m‐WO 3 and Ir/non‐m‐WO 3 . In the XPS spectra of W 4 f, two peaks are observed at 35.5 and 37.7 eV (Figure 5b), assigned to the binding energies of the 4f 7/2 and 4f 5/2 electrons of W 6+ , respectively [27–29] . For the XPS spectra of Ir 4 f (Figure 5c), it can be fitted into four sub‐peaks: the ones with binding energies at 61.5 and 64.3 eV correspond to the 4f 7/2 and 4f 5/2 electrons of Ir 0 respectively, while those located at 62.6 and 65.3 eV to the 4f 7/2 and 4f 5/2 electrons of Ir 4+ respectively.…”

Computational Design of 2D Phosphorus Nanostructures for Renewable Energy Applications: A Review

“…The groundbreaking discovery of photoelectrochemical water splitting on n‐type TiO 2 reported in 1972 heralded the era of solar photocatalysis research [ 288 ] . Since then, inorganic heterogenous photocatalysts, such as metal oxides (TiO 2 , [ 289,290 ] ZnO, [ 291,292 ] BiVO 4 , [ 293,294 ] Bi 2 WO 6 , [ 295,296 ] and Fe 2 O 3 , [ 297,298 ] ) and chalcogenides (ZnS, [ 299,300 ] CdS, [ 301,302 ] and Zn x Cd 1‐x S x [ 303,304 ] ) have undergone extensive investigation, owing to their stable structure and high activity. Unfortunately, the challenges faced in modulating and regulating these transition metal‐based compounds have led to the development of metal‐free photocatalyst.…”

A Comprehensive Review on Graphitic Carbon Nitride for Carbon Dioxide Photoreduction

“…Following that, a reduction reaction undergoes on CB of semiconductor II, while the oxidation process starts on VB of semiconductor I. [ 569,570 ] As a result, CO 2 is reduced to hydrocarbons such as HCOOH, CH 4 , CO, and other similar compounds on the CB of semiconductor II. Table 3 shows the reaction equations and potentials for various commonly used products.…”