Construction of 2D BiVO₄−CdS−Ti₃C₂T_x Heterostructures for Enhanced Photo‐redox Activities

Abstract

Photocatalytic evolution of hydrogen and oxygen from water splitting over semiconductors is an efficient method for solar energy conversion. In this study, the 2D/2D BiVO4−CdS heterostructures with Ti3C2Tx (Tx=O, OH, F) as a co‐catalyst were synthesized by two steps as the visible‐light‐driven photocatalysts. Compared with BiVO4 and CdS, the heterostructured catalysis exhibit greatly enhanced photocatalytic hydrogen and oxygen production performances and excellent photodegradation and photoreduction activities of methylene blue (MB) and potassium dichromate Cr(VI), respectively. The remarkable enhancement is attributed to the proposed Z‐scheme carrier transfer derived from the 2D/2D BiVO4−CdS heterostructures. Charge separation and transfer of photoexcited electrons and holes pairs are further enhanced after loading Ti3C2Tx in the BiVO4−CdS heterostructures. The potential Z‐scheme photocatalytic system and co‐catalyst endows the BiVO4−CdS−Ti3C2Tx heterostructures with strong photo‐redox capacity and excellent stability in solar energy conversion.

HKUST-1 loaded few-layer Ti3C2Tx for synergistic chemo-photothermal effects to enhance antibacterial activity

“…The interface between the lamellar Ti 3 C 2 T x and particle could be observed. The (100) 49 crystal plane of Ti 3 C 2 T x has a lattice stripe of 0.25 nm. The lattice fringe spacing of the particles is 0.21 nm, which is consistent with the (111) crystal plane lattice fringe spacing of metallic Cu in HKUST-1 in Fig.…”

Recent advances in MXenes: a promising 2D material for photocatalysis

“…Metal sulfide, in addition to TiO 2 , is employed to mix with Ti 3 C 2 T. In the most recent study, Xie et al used an electrostatic self-assembly approach to create 2D in-plane CdS/ Ti 3 C 2 T x sheet-onto-sheet hetero-structures. 78 It's interesting to note that a number of concurrent elements, including a well-designed type-II band alignment and a Schottky junction with a favorable charge-density relationship, are credited with the increased photoactivity of ternary nanostructures. This phenomenon specifically results from the cooperative action of the exceptional electrical conductivity of Ti 3 C 2 T x , the visible-light responsive In 2 S 3 , and the upward band bending of TiO 2 .…”

“…Metal sulfide, in addition to TiO 2 , is employed to mix with Ti 3 C 2 T. In the most recent study, Xie et al used an electrostatic self-assembly approach to create 2D in-plane CdS/Ti 3 C 2 T x sheet-onto-sheet hetero-structures. 78 Ti 3 C 2 T x Janus co-catalysts are used in this catalytic system to both improve the extraction of electrons from CdS and to prevent hole-mediated photo-corrosion of CdS. The longer photoelectron lifetime of CdS/0.5% Ti 3 C 2 T x than that of bare CdS is attributed to Ti 3 C 2 T x having a lower Fermi level than the CB of CdS.…”

MXene-Based Composites as Nanozymes in Biomedicine: A Perspective

“…In addition, simplicity, eco-friendly sustainable features, and cost effectiveness are crucial issues in translating the laboratory synthesis to industrial scale. Despite a variety of introduced synthesis techniques such as solvothermal treatment, calcination procedures, electrostatic self-assembly, hydrothermal synthesis, mechanical/ultrasonic mixing, chemical vapor deposition, among others, efforts are still required to focus on yield of production, feasible analyses, stability of final products, biosafety of chemical agents, and the reproducibility of processes [ 112 , 113 ]. Some techniques such as mechanical/ultrasonic mixing strategies have shown interesting simplicity for fabrication of MXenes [ 112 ].…”

“…Despite a variety of introduced synthesis techniques such as solvothermal treatment, calcination procedures, electrostatic self-assembly, hydrothermal synthesis, mechanical/ultrasonic mixing, chemical vapor deposition, among others, efforts are still required to focus on yield of production, feasible analyses, stability of final products, biosafety of chemical agents, and the reproducibility of processes [ 112 , 113 ]. Some techniques such as mechanical/ultrasonic mixing strategies have shown interesting simplicity for fabrication of MXenes [ 112 ]. Meanwhile, MXenes with fascinating properties have been synthesized using electrostatic self-assembly and hydrothermal/solvothermal techniques [ 114 ].…”