Few-layer MoS₂ nanosheet-coated KNbO₃ nanowire heterostructures: piezo-photocatalytic effect enhanced hydrogen production and organic pollutant degradation

Abstract

MoS2 nanosheets coated KNbO3 nanowires showed enhanced piezo-photocatalytic degradation of organic pollution and hydrogen production performance.

Advances in Piezo‐Phototronic Effect Enhanced Photocatalysis and Photoelectrocatalysis

“…Moreover, KNbO 3 has also been reported as a photocatalyst for water reduction (H 2 evolution). [ 77,78 ] For example, Jia et al designed a novel MoS 2 /KNbO 3 photocatalyst via a simple hydrothermal method, which exhibits effective photocatalytic H 2 production under Xe lamp illumination. And the photocatalytic activity is two times improved by utilizing ultrasonic energy to generate internal piezoelectric field for charge transfer (entry 3 in Table 2).…”

“…And the photocatalytic activity is two times improved by utilizing ultrasonic energy to generate internal piezoelectric field for charge transfer (entry 3 in Table 2). [ 78 ]…”

“…Recently, low‐dimensional MoS 2 has been regarded as an alternative choice for piezo‐catalysis. [ 78,91,92 ] As shown in Figure 15 , the D 3h point group symmetric MoS 2 (one Mo layer in two S layers) exhibits identical MoS bond length of 2.42 Å. If the Mo‐2S dipoles are stretched, a spontaneous polarization points from S to Mo along with armchair direction (+ x direction) is thereby created.…”

“…As shown in Figure 22 a,b, Jia et al combined piezoelectric KNbO 3 /MoS 2 for superior photocatalytic H 2 production and organic pollutant degradation. [ 78 ] In this KNbO 3 /MoS 2 composite, MoS 2 acts as cocatalyst to transfer the photoinduced electrons and holes from KNbO 3 (black curve in Figure 22c). Moreover, under external strain, the deformation of KNbO 3 will lead to a large number of positive and negative polarization charges on the opposite surfaces.…”

Simultaneous Piezoelectrocatalytic Hydrogen‐Evolution and Degradation of Water Pollutants by Quartz Microrods@Few‐Layered MoS2 Hierarchical Heterostructures

“…Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) images (and its inset image) of QMSH are shown in Figure 1e (Figure 1h), implying that the uniaxial tensile strains resulted in nonperfect stacked MoS 2 nanosheets through weak van der Waals interactions along the direction of [001] in QMSH and MoS 2 NFs. [26][27][28] Furthermore, the (002), (100), and (110) peaks of MoS 2 nanosheets in QMSH shifted toward a lower angle compared with those of MoS 2 NFs, as shown in Figure S1a-c in the Supporting Information, respectively, indicating that QMSH exhibited in-plane uniaxial tensile strains. [29] TEM energy-dispersive X-ray spectroscopy mapping ( Figure S1d, Supporting Information) shows the distribution of Si, O, Mo, and S elements, indicating that the few-layered MoS 2 nanosheets heterogeneously grew on the surface of quartz MRs.…”