Direct and indirect Z-scheme heterostructure-coupled photosystem enabling cooperation of CO2 reduction and H2O oxidation

Abstract

The stoichiometric photocatalytic reaction of CO 2 with H 2 O is one of the great challenges in photocatalysis. Here, we construct a Cu 2 O-Pt/SiC/IrO x composite by a controlled photodeposition and then an artificial photosynthetic system with Nafion membrane as diaphragm separating reduction and oxidation half-reactions. The artificial system exhibits excellent photocatalytic performance for CO 2 reduction to HCOOH and H 2 O oxidation to O 2 under visible light irradiation. The yields of HCOOH and O 2 meet almost stoichiometric ratio and are as high as 896.7 and 440.7 μmol g −1 h −1 , respectively. The high efficiencies of CO 2 reduction and H 2 O oxidation in the artificial system are attributed to both the direct Z-scheme electronic structure of Cu 2 O-Pt/SiC/IrO x and the indirect Z-scheme spatially separated reduction and oxidation units, which greatly prolong lifetime of photogenerated electrons and holes and prevent the backward reaction of products. This work provides an effective and feasible strategy to increase the efficiency of artificial photosynthesis.

Microcantilever Fracture Tests on Eutectic NiAl–Cr(Mo) In Situ Composites

“…Nevertheless, the fracture toughness of the multiphase cantilevers is even for the toughest ones lower than of macroscopic experiments. [ 7–9 ]…”

“…Early work by Walter and Cline [ 2–6 ] showed that eutectic systems of β‐NiAl, where a solid‐solution body‐centered cubic (bcc) phase is embedded in the B2‐ordered NiAl phase, exhibit improved fracture properties. Especially the addition of Cr and Mo increases the fracture toughness to values of , [ 7–9 ] compared with 1.8 of pure NiAl when tested in the soft orientation and 6.9 in the hard orientation. [ 10 ]…”

Rare‐Earth‐Based Metal–Organic Frameworks as Multifunctional Platforms for Catalytic Conversion

“…Recently, both inorganic and organic materials have been reported for photocatalytic applications such as water reduction, water oxidation, and CO 2 reduction. [74][75][76][77] Currently, MOFs have been developed as new types of photocatalysts. The structure of MOFs facilitates them to be readily immobilized with photocatalytic active sites.…”

Interfacial Chemical Bond and Internal Electric Field Modulated Z-Scheme Vs-ZnIn2S4/MoSe2 Photocatalyst for Efficient Hydrogen Evolution

“…However, for mono-component semiconductor, it is impossible to satisfy all of these demands at the same time. Over the past decades, researchers have developed various strategies to improve photocatalytic property, including phase and morphology regulating, elements doping, cocatalyst-loading, defect engineering and heterojunction constructing [7][8][9][10][11] . Among these strategies, defect engineering and heterojunction constructing are the two-effective means.…”