Research Progress on Photocatalytic CO₂ Reduction Based on Perovskite Oxides

Abstract

Photocatalytic CO2 reduction to valuable fuels is a promising way to alleviate anthropogenic CO2 emissions and energy crises. Perovskite oxides have attracted widespread attention as photocatalysts for CO2 reduction by virtue of their high catalytic activity, compositional flexibility, bandgap adjustability, and good stability. In this review, the basic theory of photocatalysis and the mechanism of CO2 reduction over perovskite oxide are first introduced. Then, perovskite oxides' structures, properties, and preparations are presented. In detail, the research progress on perovskite oxides for photocatalytic CO2 reduction is discussed from five aspects: as a photocatalyst in its own right, metal cation doping at A and B sites of perovskite oxides, anion doping at O sites of perovskite oxides and oxygen vacancies, loading cocatalyst on perovskite oxides, and constructing heterojunction with other semiconductors. Finally, the development prospects of perovskite oxides for photocatalytic CO2 reduction are put forward. This article should serve as a useful guide for creating perovskite oxide‐based photocatalysts that are more effective and reasonable.

Improved Charge Separation and CO2 Affinity of In2O3 by K Doping with Accompanying Oxygen Vacancies for Boosted CO2 Photoreduction

“…To boost the photocatalytic performance of semiconductor photocatalysts, many modification strategies have been developed, such as heterojunction engineering, element doping, defect engineering, metal deposition, coupling with carbon materials, and so on. , Recently, element doping, especially doping with heteroatoms, which may simultaneously promote the efficiency of the above three steps for CO 2 conversion, has aroused diverse interests, and it should be noted that element doping can effectively inhibit both bulk and surface charge recombination . Typically, the substitutional K dopant can change the morphology, adjust the electronic band structure and surface structure of photocatalysts, and then lead to the enhanced photoactivity .…”

Core–shell engineered g-C3N4 @ NaNbO3 for enhancing photocatalytic reduction of CO2

“…Photocatalytic CO 2 reduction technology utilizes solar energy to convert CO 2 and water into usable chemical fuels on a photocatalyst, effectively utilizing and transforming CO 2 . Compared to conventional thermal and electrocatalytic CO 2 reduction, photocatalytic CO 2 reduction showed the advantages of mild reaction conditions, compliance with green chemistry principles, and good catalyst stability [8,9]. Since Fujishima and Honda achieved the photocatalytic decomposition of water on titanium dioxide (TiO 2 ) catalysts in 1972 [10], researchers had begun studying various types of photocatalytic reactions and different photocatalysts [11][12][13][14][15][16].…”

Mn doping improves the photocatalytic performance of CdS photocatalysts

“…In general, the more negative the CB potential of the Mn x Cd 1−x S solid solution, the easier the charge transfer, while a suitable narrow band gap facilitates the full use of incident light, both of which are favourable for the photocatalytic decomposition of aqueous hydrogen reactions [21,22] . Thus, although the photoresponsive range of the Mn x Cd 1−x S solid solution is smaller than that of Cs, but the more negative conduction band position provides a stronger thermodynamic drive for the reduction reaction of H. Currently, MnxCd1-xS solid solutions applied for photocatalytic decomposition of aqueous hydrogen have various morphologies, including irregular particles [23] , owerlike microspheres [24] , hollow spheres [27] , polyhedra [25] , nanorods tetra-and nanowires [26] . In general, different microforms have different effects on the photocatalytic performance.…”