Coupling of piezoelectric, semiconducting and photoexcitation properties in NaNbO 3 nanostructures for controlling electrical transport: Realizing an efficient piezo-photoanode and piezo-photocatalyst

Singh, Simrjit; Khare, Neeraj

doi:10.1016/j.nanoen.2017.05.029

Cited by 204 publications

(99 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[14] Singh and Khare demonstrated the enhanced water splitting activity of piezoelectric-NaNbO 3 owing to the piezophototronic effect. [15] Wang et al fabricated TiO 2 /ZnO nanowire to enhance H 2 production by piezo-photocatalytic effect. [16] However, a thorough mechanism behind the piezophotocatalytic behavior is not established by the very limited reports in this emerging area, while the piezo-photocatalytic ROS evolution initiated by piezoelectric semiconductors has never been touched so far.…”

Section: Introductionmentioning

confidence: 99%

Coupling Piezocatalysis and Photocatalysis in Bi₄NbO₈X (X = Cl, Br) Polar Single Crystals

Huang

Chen

et al. 2019

Adv Funct Materials

263

122

View full text Add to dashboard Cite

Reactive oxygen species (ROS) as green oxidants are of great importance for environmental and biological applications. Photocatalysis is one of the major routes for ROS evolution, which is seriously restricted by rapid charge recombination. Herein, piezocatalysis and photocatalysis (i.e., piezo–photocatalysis) are coupled to efficiently produce superoxide radicals (•O2−), hydrogen peroxide (H2O2), and hydroxyl radicals (•OH) via oxygen reduction reaction (ORR), by using Bi4NbO8X (X = Cl, Br) single crystalline nanoplates. Significantly, the piezo‐photocatalytic process leads to the highest ORR performance of the Bi4NbO8Br nanoplates, exhibiting •O2−, H2O2, and •OH evolution rates of 98.7, 792, and 33.2 µmol g−1 h−1, respectively. The formation of a polarized electric field and band bending allows directional separation of charge carriers, promoting the catalytic activity. Furthermore, the reductive active sites are found enriched on all the facets in the piezo–photocatalytic process, also contributing to the ORR. By piezo–photodeposition of Pt to artificially plant reductive reactive sites, the Bi4NbO8Br plates demonstrate largely enhanced photocatalytic H2 production activity with a rate of 203.7 µmol g−1 h−1. The present work advances piezo–photocatalysis as a new route for ROS generation, but also discloses the potential of piezo–photocatalytic active sites enriching for H2 evolution.

show abstract

Section: Introductionmentioning

confidence: 99%

Coupling Piezocatalysis and Photocatalysis in Bi₄NbO₈X (X = Cl, Br) Polar Single Crystals

Huang

Chen

et al. 2019

Adv Funct Materials

263

122

View full text Add to dashboard Cite

show abstract

“…[28] Khare et al reported that the separation rate of photogenerated electron and hole pairs was significantly enhanced under ultrasonic vibration (Figure 4c), resulting in amuch higher photocatalytic degradation rate of MB with the ultrasonic piezo-potential manipulation than that without the piezo-electric field (Figure 4d). [19] Huang et al reported that macroscopic polarization enhancement in BiOIO 3 can efficiently promote the separation of photo-induced charge carriers,leading to the high evolution rate of reactive oxygen species (e.g., hydroxyl radicals and superoxide radicals). [18] After doping vanadium into the lattice of BiOIO 3 to yield V-BiOIO 3 ,V 5+ ions replaced I 5+ ions in IO 3 polyhedra, thereby strengthening the polarization of BiOIO 3 and further improving the piezophoto-catalytic process.…”

Section: Piezoelectric-material-mediated Catalysismentioning

confidence: 99%

“…(c-d) Adapted with permission from Ref. [19].C opyright2 017, Elsevier.P olarized piezoelectricfield generated by BaTiO 3 separates photogenerated charge carriers of Ag 2 O: e) Absorption spectra of RhB solution under UV and ultrasonic irradiation using Ag 2 O-BaTiO 3 hybrid materials as catalysts. f) The catalytic mechanism of the process in (e).…”

Section: Pyroelectric-material-mediated Catalysismentioning

confidence: 99%

Enabling PIEZOpotential in PIEZOelectric Semiconductors for Enhanced Catalytic Activities

et al. 2019

View full text Add to dashboard Cite

The past several decades have witnessed significant advances in the synthesis and applications of PIEZOelectric semiconductors, an important class of materials, including piezoelectric, pyroelectric, and ferroelectric semiconductors. The intriguing combination of physical and chemical phenomena in PIEZOelectric semiconductors has triggered much interest in PIEZOcatalysis, that is, catalysis enabled by PIEZOpotential (i.e., piezopotential, pyropotential, and ferropotential)‐induced built‐in electric fields, which is the focus of this Minireview. First, the PIEZOelectric materials are briefly introduced. Second, recent developments in PIEZOcatalysis are highlighted, including the introduction of representative PIEZOelectric semiconductors, their possible catalytic mechanisms, novel techniques to produce their PIEZOelectric effects during the catalytic process, and several examples of PIEZOcatalysis. Finally, the challenges in the field and exciting opportunities to further improve the PIEZOcatalytic efficiency are discussed.

show abstract

“…Recently, perovskite‐type metal oxides, such as SrTiO 3 and NaTaO 3 , have attracted widespread attention in the fields of photocatalytic water splitting and degradation of organic pollutants in virtue of their stable layered structure, effectiveness in charge separation, high corrosion resistance, outstanding physical and chemical properties, and excellent photocatalytic activity . Among these perovskite materials, sodium niobate (NaNbO 3 ) has emerged as a potential candidate for photocatalysis and is touted as an environmentally friendly and viable replacement of widely used TiO 2 . Gu et al reported that the cubic NaNbO 3 nanowires with 0.5 wt% of Pt cocatalyst could split water to H 2 with quite high efficiency.…”

Section: Introductionmentioning

confidence: 99%

Double‐hole‐mediated coupling of anionic dopants in perovskite NaNbO₃ for efficient solar water splitting

Wang

Teng

et al. 2019

Int J of Quantum Chemistry

View full text Add to dashboard Cite

Doping is an effective strategy to improve the photocatalytic performances of semiconductor photocatalyst for water splitting. In this work, we perform extensive hybrid density functional calculations to investigate perovskite NaNbO3 with anionic monodoping with N, C, P, and S dopants as well as with (N + N), (C + S), and (N + P) codoping pairs. Theoretical results clearly reveal that the band structures of NaNbO3 can be effectively tailored by introducing double‐hole‐mediated coupling of anion‐anion pairs. Compared with the monodoping cases, the anion‐anion codoped NaNbO3 systems not only have substantially narrowed band gaps, but also can eliminate the unoccupied localized states appearing above the Fermi level, which are disastrous for photocatalysis as they may trap the photogenerated carriers. Optical absorption curves further convince that the codoped NaNbO3 can effectively harvest visible light. The band edge positions with respect to the redox potentials of water demonstrate that the (N + N) codoped NaNbO3 are desirable for efficient solar water splitting.

show abstract

Coupling of piezoelectric, semiconducting and photoexcitation properties in NaNbO 3 nanostructures for controlling electrical transport: Realizing an efficient piezo-photoanode and piezo-photocatalyst

Cited by 204 publications

References 34 publications

Coupling Piezocatalysis and Photocatalysis in Bi₄NbO₈X (X = Cl, Br) Polar Single Crystals

Coupling Piezocatalysis and Photocatalysis in Bi₄NbO₈X (X = Cl, Br) Polar Single Crystals

Enabling PIEZOpotential in PIEZOelectric Semiconductors for Enhanced Catalytic Activities

Double‐hole‐mediated coupling of anionic dopants in perovskite NaNbO₃ for efficient solar water splitting

Contact Info

Product

Resources

About

Coupling of piezoelectric, semiconducting and photoexcitation properties in NaNbO 3 nanostructures for controlling electrical transport: Realizing an efficient piezo-photoanode and piezo-photocatalyst

Cited by 204 publications

References 34 publications

Coupling Piezocatalysis and Photocatalysis in Bi4NbO8X (X = Cl, Br) Polar Single Crystals

Coupling Piezocatalysis and Photocatalysis in Bi4NbO8X (X = Cl, Br) Polar Single Crystals

Enabling PIEZOpotential in PIEZOelectric Semiconductors for Enhanced Catalytic Activities

Double‐hole‐mediated coupling of anionic dopants in perovskite NaNbO3 for efficient solar water splitting

Contact Info

Product

Resources

About

Coupling Piezocatalysis and Photocatalysis in Bi₄NbO₈X (X = Cl, Br) Polar Single Crystals

Coupling Piezocatalysis and Photocatalysis in Bi₄NbO₈X (X = Cl, Br) Polar Single Crystals

Double‐hole‐mediated coupling of anionic dopants in perovskite NaNbO₃ for efficient solar water splitting