Z‐Scheme Photocatalytic Systems for Carbon Dioxide Reduction: Where Are We Now?

Abstract

under the supervision of Prof. Dr.W ee-Jun Ong. His research interests mainly focus on engineering noble-metal-free semiconductor photocatalysts for CO 2 reductiont omimic natural photosynthesis. Wee-Jun Ong received his BEng and Ph.D. degrees in Chemical Engineeringfrom Monash University.I n2016, he joined IMRE, A*STAR, Singapore as aStaff Scientist. He was an

Progress and challenges in photocatalytic ammonia synthesis

“…The combination of two semiconductors as a photocatalyst would overcome the shortages of each component, and construct the heterostructure or Z-scheme system with improved photoelectric properties for broad applications. [112][113][114][115][116] In one work, Bi2MoO6 was implanted on g-C3N4 nanosheets to enhance the photocatalytic N2 reduction. 112 In this case, the obtained g-C3N4/Bi2MoO6 heterojunction showed effective separation of charge carriers and enhanced photocatalytic performance for NH3 production.…”

Rational Design of Carbon‐Based 2D Nanostructures for Enhanced Photocatalytic CO2Reduction: A Dimensionality Perspective

“…After the photoexcitation, the electrons in conduction band (CB) and holes in valence band (VB) served as charge carriers for the photoreduction and photooxidation, respectively. In addition, the position of CB relative to the reduction potential of CO 2 is an important parameter to assess the thermodynamic viability . Ideally, at a known pH value, the CB potential of catalyst should be more negative than the reduction potential to produce desired products while, the VB should be more positive than the oxidation level of water to produce protons and oxidize water .…”

“…Aside from the p–n heterojunction, the Z‐Scheme system is also another prominent charge transfer mechanism . Wang and co‐worker have developed a series of Z‐scheme BiOI/g‐C 3 N 4 photocatalyst via a simple deposition approach .…”

“…In particular, 2D materials have emerged as a significant class of photocatalyst that can yield high photocatalytic CO 2 activity . Due to their sheet‐like design, 2D‐material based photocatalysts are anticipated to offer excellent properties, such as high specific surface area, high ratio of uncoordinated surface atoms, abundant amount of surface defects and active sites, shorter transport distance in the bulk phase, strong quantum confinement of electrons in 2D and diverse options for the tethering of guest species .…”

Sustained CO2-photoreduction activity and high selectivity over C, Mn-codoped ZnO core-triple shell hollow spheres

“…global warming by the augmented greenhouse gases (especially CO 2 ) emission and depletion of such nonrenewable sources. [1][2][3][4] Nowadays, it becomes a global appeal to develop sustinable energy grids based on renewable energy sources such as solar, wind, geothermal energies. 5,6 Reliable conversion of CO 2 by the aid of solar light to energy-rich fuels (i.e.…”