Promoted Photocharge Separation in 2D Lateral Epitaxial Heterostructure for Visible‐Light‐Driven CO₂ Photoreduction

Abstract

solar-energy conversion process, not only in solar cell but also in photocatalysis, involves solar-light harvesting and photoexcited charge carrier separation/transportation. [8,9] Heterostructure, in which materials with different properties are integrated together, generally can harvest wide solar light derived from multi ple components and possesses prominent photoexcited charge separation/transportation properties benefiting from internal electric field formed at the heterointerface. [10] Hence, exploring suitable components to construct heterostructure represents an efficient and facile strategy to improve the solar energy conversion efficiency. Nowadays, 2D materials have attracted enormous research interest in optical electronic devices, catalysis, and solar-energy conversion fields due to their high specific surface area, [11] large fraction of surface exposed atoms, [12] and excellent mechanical, optical, and electronic properties. [13,14] Benefiting from layered structural properties, 2D materials are prone to be constructed into heterostructures. Typically, 2D heterostructures include vertical heterostructures in which the layers of various 2D materials are stacked vertically, [15] and lateral heterostructures in which multiple 2D materials are seamlessly stitched lateral. [16] Most of the current reported 2D heterostructures

Recent Progress on Two-Dimensional Materials

“…Among these state-of-the-art photocatalysts, 2D photocatalytic materials attracted much attention due to their unique 2D confined structure and inherent physicochemical property, especially the shorter path for migration of electron and hole to the surface 329,1075,[1092][1093][1094][1095][1096] . Herein, we divide them into metal-containing 2D photocatalysts (e.g., LDHs 275,1097-1105 , TMDs 1098,[1106][1107][1108][1109] , MXenes-based catalysts 1098,1110,1111 , 2D metal oxides 1098,[1112][1113][1114][1115][1116][1117][1118] , etc.) and metal-free 2D photocatalysts (g-C3N4 1098,1106,[1119][1120][1121][1122][1123] , graphene 1098,1106,1120,1124,1125 , BP 1093,1098,1119,1120,[1126][1127][1128][1129][1130]...…”

Highly Dispersed Pt Nanoparticle-Doped Mesoporous ZnO Photocatalysts for Promoting Photoconversion of CO2 to Methanol

“…In the dark condition, the results revealed that no signals, DMPO- • OH or DMPO- • O 2 – , can be determined (data not shown). DMPO- • OH responses over Pt/ZnO (Figure a) indicate four ESR signals under UV–vis with an intensity ration of 1:2:2:1, which are obtained from the OH – /H 2 O oxidation by the generated holes (Figure a). , The obtained ESR signals indicate that • OH radicals are produced through illumination for 4 min. Figure b shows four ESR signals assigned to DMPO- • O 2 – , which are consistent with the O 2 reduction using the photocreated electrons .…”

Internal Electric Field on Steering Charge Migration: Modulations, Determinations and Energy‐Related Applications

“…[ 169 ] Besides, a lateral heterostructure of BiOCl@Bi 2 O 3 was successfully fabricated through sonicating‐assisted etching of Cl in BiOCl. [ 170 ] Different from traditional vertical heterostructures whose interfacial IEF is originated from the van der Waals force, the unique lateral heterostructure induces an IEF via chemical bonding at the lateral interface, which can achieve much more effective photoinduced charge separation and transportation and a great extension of carrier lifetimes. Hence, superior photocatalytic CO 2 reduction ability can be obtained with a CO yield rate of about 30 μmol g −1 h −1 under visible light illumination.…”