The crystal facet-dependent electrochemical performance of TiO2 nanocrystals for heavy metal detection: Theoretical prediction and experimental proof

Liao, Jianjun; Yang, Fan; Wang, Cai‐Zhuang; Lin, Shiwei

doi:10.1016/j.snb.2018.05.067

Cited by 34 publications

(11 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Under UV irradiation, reduction of U(VI) into surface-bound compounds was observed. Adsorption of Pb(II) over a (101) surface of anatase was studied computationally by Zhang et al [64]. The computed adsorption energy was −215 kJ/mol, which is very large, possibly due to the absence of any solvent in the computational model.…”

Section: Adsorption Over Tio 2 Surfacesmentioning

confidence: 99%

Recent Advancements in the Understanding of the Surface Chemistry in TiO2 Photocatalysis

et al. 2020

View full text Add to dashboard Cite

Surface chemistry plays a major role in photocatalytic and photoelectrochemical processes taking place with the participation of TiO2. The synthesis methods, surface characterizations, theoretical research methods, and hardware over the last decade generated opportunities for progress in the surface science of this photocatalyst. Very recently, attention was paid to the design of photocatalysts at the nanoscale level by adjusting the types of exposed surfaces and their ratio, the composition and the surface structure of nanoparticles, and that of individual surfaces. The current theoretical methods provide highly detailed designs that can be embodied experimentally. The present review article describes the progress in the surface science of TiO2 and TiO2-based photocatalysts obtained over the last three years. Such aspects including the properties of macro- and nano-scale surfaces, noble-metal-loaded surfaces, doping with Mg and S, intrinsic defects (oxygen vacancies), adsorption, and photoreactions are considered. The main focus of the article is on the anatase phase of TiO2.

show abstract

Section: Adsorption Over Tio 2 Surfacesmentioning

confidence: 99%

Recent Advancements in the Understanding of the Surface Chemistry in TiO2 Photocatalysis

et al. 2020

View full text Add to dashboard Cite

show abstract

“…The changes in the DOS of Ce, O, and Pb atoms are shown in Figure a. It is clearly seen that several newborn orbital hybrid peaks emerged in the total DOS of Ce-doped α-MoO 3 /Pb (in black dotted frame), which suggests more stable adsorption configuration of Pb(II) on Ce-doped α-MoO 3 than that on α-MoO 3 . Besides, the adsorptive energy of Pb(II) adsorbed on Ce-doped α-MoO 3 (−2.40 eV) was much lower than that adsorbed on α-MoO 3 (−1.50 eV).…”

Section: Resultsmentioning

confidence: 99%

Electrons in Oxygen Vacancies and Oxygen Atoms Activated by Ce³⁺/Ce⁴⁺ Promote High-Sensitive Electrochemical Detection of Pb(II) over Ce-Doped α-MoO₃ Catalysts

Yang

Chen

et al. 2020

Anal. Chem.

View full text Add to dashboard Cite

Modulating the active sites of oxygen vacancies (OVs) to enhance the catalytic properties of nanomaterials has attracted much research interest in various fields, but its intrinsic catalytic mechanism is always neglected. Herein, we establish an efficient strategy to promote the electrochemical detection of Pb(II) by regulating the concentration of OVs in α-MoO 3 nanorods via doping Ce 3+ /Ce 4+ ions. α-MoO 3 with the Cedoped content of 9% (C9M) exhibited the highest detection sensitivity of 106.64 μM μA −1 for Pb(II), which is higher than that achieved by other metal oxides and most precious metal nanomaterials. It is found that C9M possessed the highest concentration of OVs, which trapped some electrons for strong affinity interaction with Pb(II) and provided numerous atomic level interfaces of high surface free energy for catalysis reactions. X-ray absorption fine structure spectra and density functional theory calculation indicate that Pb(II) was bonded with the surface-activated oxygen atoms (Os) around Ce ions and obtained some electrons from Os. Besides, the longer Pb−O bonds on C9M were easier to break, causing a low desorption energy barrier to effectively accelerate Pb(II) desorbing to the electrode surface. This study helps to understand the changes in electronic structure and catalytic performance with heteroatom doping and OVs in chemically inert oxides and provide a reference for designing highactive electrocatalytic interfaces to realize ultrasensitive analysis of environmental contaminants.

show abstract

“…The TiO 2 decorated on the surface of Ti 3 C 2 T X was helpful to improve the electrocatalytic activity, and TiO 2 could also promote the adsorption of heavy metal ions. 16,17,38 According to the comparison of two groups (NiMOF/GCE and NiMOF-600/GCE, Ti 3 C 2 T X /GCE with Ti 3 C 2 T X -600/GCE), the pyrolysis process enhanced the electrochemical properties of NiMOF and Ti 3 C 2 T X . In Fig.…”

Section: Resultsmentioning

confidence: 99%

TiO₂/Ni–NC Hybrid Derived from Ti₃C₂T_X/NiMOF for Highly Sensitive Electrochemical Sensing of Mercury Ions

Wang

Bai²,

Wang³

et al. 2023

J. Electrochem. Soc.

View full text Add to dashboard Cite

Mercury ions (Hg2+) pose serious threats to ecological environment and human health, which lead to the increasing demand for rapid and sensitive detection methods. Herein, an electrochemical sensor based on titanium dioxide/nickel nanoparticles-nitrogen doped carbon (TiO2/Ni-NC) modified glassy carbon electrode (GCE) was developed for the detection of Hg2+. A Ti3C2TX/NiMOF composite was synthesized by in-situ growing NiMOF on the multilayered structure of Ti3C2TX. Through a facile pyrolysis treatment, TiO2/Ni-NC was derived from Ti3C2TX/NiMOF. N element doped carbon with a porous structure provided electron transfer channels for the electrochemical reaction and an ideal matrix for immobilizing catalytic sites. The TiO2 and Ni nanoparticles were homogeneously distributed on the carbon matrix, and they exhibited good catalytic activity toward the electrochemical reaction of Hg2+. The accumulation of Hg2+ was promoted due to the chelation with the doped N element. The differential pulse anodic stripping voltammetry method coupled with the TiO2/Ni-NC/GCE sensor was used to determine the concentration of Hg2+. Under optimal conditions, our proposed method presented a wide detection range (1 nM to 10 μM) and a low detection limit (0.79 nM). The sensor provided a satisfactory recovery in real water sample analysis, demonstrating the feasibility for environmental monitoring applications.

show abstract

The crystal facet-dependent electrochemical performance of TiO2 nanocrystals for heavy metal detection: Theoretical prediction and experimental proof

Cited by 34 publications

References 41 publications

Recent Advancements in the Understanding of the Surface Chemistry in TiO2 Photocatalysis

Recent Advancements in the Understanding of the Surface Chemistry in TiO2 Photocatalysis

Electrons in Oxygen Vacancies and Oxygen Atoms Activated by Ce³⁺/Ce⁴⁺ Promote High-Sensitive Electrochemical Detection of Pb(II) over Ce-Doped α-MoO₃ Catalysts

TiO₂/Ni–NC Hybrid Derived from Ti₃C₂T_X/NiMOF for Highly Sensitive Electrochemical Sensing of Mercury Ions

Contact Info

Product

Resources

About

The crystal facet-dependent electrochemical performance of TiO2 nanocrystals for heavy metal detection: Theoretical prediction and experimental proof

Cited by 34 publications

References 41 publications

Recent Advancements in the Understanding of the Surface Chemistry in TiO2 Photocatalysis

Recent Advancements in the Understanding of the Surface Chemistry in TiO2 Photocatalysis

Electrons in Oxygen Vacancies and Oxygen Atoms Activated by Ce3+/Ce4+ Promote High-Sensitive Electrochemical Detection of Pb(II) over Ce-Doped α-MoO3 Catalysts

TiO2/Ni–NC Hybrid Derived from Ti3C2TX/NiMOF for Highly Sensitive Electrochemical Sensing of Mercury Ions

Contact Info

Product

Resources

About

Electrons in Oxygen Vacancies and Oxygen Atoms Activated by Ce³⁺/Ce⁴⁺ Promote High-Sensitive Electrochemical Detection of Pb(II) over Ce-Doped α-MoO₃ Catalysts

TiO₂/Ni–NC Hybrid Derived from Ti₃C₂T_X/NiMOF for Highly Sensitive Electrochemical Sensing of Mercury Ions