Exclusive enhancement of catalytic activity in Bi_0.5Na_0.5TiO₃nanostructures: new insights into the design of efficient piezocatalysts and piezo-photocatalysts

Abstract

Bi0.5Na0.5TiO3 nanospheres show superior piezo-photocatalytic activity in water splitting, Cr(vi) reduction and degradation of organic pollutants.

Synergetic contribution of enriched selenium vacancies and out-of-plane ferroelectric polarization in AB-stacked MoSe2 nanosheets as efficient piezocatalysts for TC degradation

“…1 Over the past few years, typical piezoelectric nanomaterials have been exploited, including ZnO, Bi 4 Ti 3 O 12 , BaTiO 3 , Bi 0.5 Na 0.5 TiO 3 , C 3 N 4 , BN, WS 2 , and MoS 2 . [2][3][4][5][6][7][8][9][10] Among these materials, two-dimensional (2D) transition metal dichalcogenides (TMDs) have demonstrated excellent piezocatalytic performance in water splitting, contaminant degradation, carbon dioxide reduction, polymerization reaction and disease treatment due to their large piezoelectric coefficients, inherent layered crystal structures and high mechanical flexibility (that can withstand large strain). 11 However, their insufficient active sites and poor electrical conductivity hinder the improvement of their piezocatalytic efficiency.…”

Piezo‐photocatalytic activity of mechanochemically synthesized BiVO4 for dye cleaning

“…Internal electric field causes the free electrons, and holes in BV readily move toward opposite polarity. 20,63,64 This suppresses the recombination possibility of electrons and holes causing more accumulation of free charge carriers at the BV surface. 65,66 The origin of the free charge carriers during ultrasonication remains open for discussion even now.…”

A reduced graphene oxide/bismuth vanadate composite as an efficient piezocatalyst for degradation of organic dye

“…In addition to this, electron transportation is also favored due to the possession of delocalized electrons on the - graphitic carbon network and higher conductivity of rGO [55]. In addition to these factors, it is also reported that the piezoelectric polarization field also provides further band bending [4,46].…”

“…The free electrons and holes within BiVO 4 get attracted, move in opposite direction towards the opposite polarity of the internal electric field. In this way, the recombination of free electrons and holes are inhibited, which results in more transportation of these free charge carriers to the BiVO 4 surface [46][47][48], which further participate in piezocatalytic surface reactions. Moreover, the piezoelectric polarization field also provides further band bending, which further assists in the easy transfer of free carriers to adsorbed pollutants undergoing piezocatalytic reactions [4,46,49].…”

“…In this way, the recombination of free electrons and holes are inhibited, which results in more transportation of these free charge carriers to the BiVO 4 surface [46][47][48], which further participate in piezocatalytic surface reactions. Moreover, the piezoelectric polarization field also provides further band bending, which further assists in the easy transfer of free carriers to adsorbed pollutants undergoing piezocatalytic reactions [4,46,49]. It is suggested in many literatures that the origin of free charge carriers inside the piezoelectric materials is due to the existence of defects in them at room temperature [4,50].…”