Triclinic‐Phase Bismuth Chromate: A Promising Candidate for Photocatalytic Water Splitting with Broad Spectrum Ranges

Abstract

helpful for rational design and synthesis of novel effective and robust materials.

Microwave-Assisted Synthesis of Bismuth Chromate Crystals for Photogenerated Charge Separation

“…The spectrum of BCO-M sample in the range of 300-500 nm exhibited larger fluctuation, which convinced the higher crystallinity and homogeneity than BCO-C sample. The sharp decrease of absorption near the edge indicated the nature of direct band gap semiconductor, which is consistent with the reported DFT calculation of Bi2MO6 14 . The valance band maximum (VBM) is determined as 1.65 eV according to XPS-VB spectrum (Fig.…”

“…1). The crystal structure of Bi2CrO6 belongs to triclinic group with parameters of a = 5.796 Å, b = 5.982 Å, c = 8.257 Å (1 Å = 0.1 nm), α = 76.85°, β = 79.42°, γ = 88.56° 14 . This anisotropic crystal symmetry implies the properties in a and b axes are comparable, which distinctly differ from those in c axis.…”

“…As a promising candidate which is able to absorb solar light with wavelength > 600 nm, bismuth chromate (Bi2CrO6) has established substantial consideration in photocatalysis [8][9][10][11][12][13] . Recently, we explored a new triclinic phase Bi2CrO6, which enables to exhibit a broad absorption range of ~650 nm with a direct band gap of 1.9 eV and shows suitable band structures for water splitting 14 . It is revealed that Bi2CrO6 possesses a relatively lower mobility of electrons and holes than typical Bi2MO6 (M = W, Mo), which manifests its poor charge separation property although the theoretical light harvesting efficiency is high.…”

Realizing Photocatalytic Overall Water Splitting by Modulating the Thickness‐Induced Reaction Energy Barrier of Fluorenone‐Based Covalent Organic Frameworks

“…The four-electron-migration oxygen evolution reaction is a rate-limiting step in photocatalytic OWS, making it critical to optimize this process when designing OWS photocatalysts. [12] 2D COFs exhibit unique characteristics wherein the monomers that make up their 2D layers stack almost perfectly into 1D channels, creating an ideal platform for the carriers migration and facilitating contact between reactants and the active sites at the interface. [13] Rational design of N-containing heterocycle in 2D COFs and modulation of the cooperative effect of N and C sites can optimize rate-determining step of the oxygen evolution reaction, thus enhancing the OWS activity of COFs as photocatalysts.…”

Multi-interface engineering of NiS/Ni3S2/Fe3O4 nanoarchitectures for use as high-efficiency electrocatalysts toward the oxygen evolution reaction

“…In light of the depletion of fossil fuels and the intensifying impact of environmental pollution, there is a pressing need to discover renewable and sustainable energy sources that can facilitate human society. [1][2][3][4] Hydrogen, with a high energy density and clean-burning properties, has long been considered as an ideal energy carrier for various applications. [5][6][7] Electrochemical water splitting, which produces hydrogen, has emerged as a promising technique due to the simplicity of operation and the lack of pollution.…”