Enhanced Charge Separation in NiO and Pd Co-Modified TiO<sub>2</sub> Photocatalysts for Efficient and Selective Photoreduction of CO<sub>2</sub>

Lan, Dengpeng; Pang, Fei; Ge, Jianping

doi:10.1021/acsaem.1c01144

Cited by 27 publications

(10 citation statements)

References 36 publications

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“…Due to the high electron density needed to drive this multielectron reduction, a p–n junction formed by introducing NiO to TiO 2 helps to drive hole transport to NiO, whereas the Pd forming a Schottky junction with TiO 2 facilitates semiconductor-to-metal electron transfer. These migrations towards NiO and Pd enhance the charge separation and result in high electron density around Pd, which can be used to transform CO 2 efficiently and selectively to CH 4 by reduction [ 160 ].…”

Section: Tio 2 Photocatalysismentioning

confidence: 99%

A Review on Nano Ti-Based Oxides for Dark and Photocatalysis: From Photoinduced Processes to Bioimplant Applications

Querebillo

2023

Nanomaterials

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Catalysis on TiO2 nanomaterials in the presence of H2O and oxygen plays a crucial role in the advancement of many different fields, such as clean energy technologies, catalysis, disinfection, and bioimplants. Photocatalysis on TiO2 nanomaterials is well-established and has advanced in the last decades in terms of the understanding of its underlying principles and improvement of its efficiency. Meanwhile, the increasing complexity of modern scientific challenges in disinfection and bioimplants requires a profound mechanistic understanding of both residual and dark catalysis. Here, an overview of the progress made in TiO2 catalysis is given both in the presence and absence of light. It begins with the mechanisms involving reactive oxygen species (ROS) in TiO2 photocatalysis. This is followed by improvements in their photocatalytic efficiency due to their nanomorphology and states by enhancing charge separation and increasing light harvesting. A subsection on black TiO2 nanomaterials and their interesting properties and physics is also included. Progress in residual catalysis and dark catalysis on TiO2 are then presented. Safety, microbicidal effect, and studies on Ti-oxides for bioimplants are also presented. Finally, conclusions and future perspectives in light of disinfection and bioimplant application are given.

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Section: Tio 2 Photocatalysismentioning

confidence: 99%

A Review on Nano Ti-Based Oxides for Dark and Photocatalysis: From Photoinduced Processes to Bioimplant Applications

Querebillo

2023

Nanomaterials

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“…Furthermore, the lattice spacing of 0.21 nm is attributed to (200) crystal facet of NiO, and can be identified via selected‐area electron diffraction (SAED) approach. [ 14 ] As depicted in SAED patterns (Figure 2g,j), the diffraction rings (blue circle) with (101), (004), and (200) are assigned to anatase TiO 2 , and the diffraction ring (red circle) with (200) is belonged to NiO, respectively.…”

Section: Resultsmentioning

confidence: 99%

Hydrophobic Ni@N‐Doped TiO₂ Nanosheet Arrays‐Carbon Paper Photocatalyst for CO₂ Photoreduction at Tri‐Phase Interfaces

Zhao

Dang

Xuan

et al. 2023

Advanced Sustainable Systems

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Rational interphase reaction provides a feasible method to overcome the matters of insufficient adsorption of CO2 molecules at the catalytic sites and competitive hydrogen evolution reaction (HER), which can increase the formation rate and selectivity of carbon derivatives in photocatalytic CO2 reduction. Herein, a hydrophobic photocatalyst with TiO2 nanosheet arrays grown on hydrophobic carbon paper (TiO2‐HCP) is fabricated using a combination of magnetron sputtering and hydrothermal method, and its unique structure not only endows it excellent light absorption and effective carrier spatial separation but also avoids the hydrophobic reagent covering reactive sites. When the interphase reaction shifts from solid–liquid diphase to gas‐liquid‐solid tri‐phase, the photocatalytic CO2 reduction over TiO2‐HCP mainly generates CO molecules and effectively suppresses HER due to the HCP suppressing the mass transfer of H2O molecules to active sites. Notably, amounts of H2 byproduct can further react with CO2/CO to produce high value‐added CH4 resultant by modifying the N‐doped TiO2‐HCP with nickel/nickel oxide species. In the tri‐phase interfacial CO2 photoreduction system, the CH4 formation rate of Ni@N‐doped TiO2‐HCP reaches 134.17 µmol m−2 h−1 (about 74.6% selectivity) and total carbon derivatives selectivity is about 93%.

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“…Moreover, the pristine PdAg NPs were further qualitatively confirmed by energy-dispersive spectrum (EDS), where the atomic ratio between Pd and Ag in PdAg 2:1 was measured to be 62.1 and 37.9%, respectively (Supplementary Figure S2D). In addition, it is known that the successful connection between metal cocatalysts and photocatalysts would result in improved charge separation (Lan et al, 2021). Therefore, transient resolved photoluminescence (TRPL) was exploited to analyze the lifetime of charge after the decoration of PdAg, from which an enhanced lifetime (from 0.465 to 1.396 ns, Supplementary Figure S5) was observed, suggesting that the charge transfer was built between PdAg NPs and α-Fe 2 O 3 /CdS.…”

Section: Resultsmentioning

confidence: 99%

Decoration of PdAg Dual-Metallic Alloy Nanoparticles on Z-Scheme α-Fe2O3/CdS for Manipulable Products via Photocatalytic Reduction of Carbon Dioxide

Yang

Zhang

et al. 2022

Front. Chem.

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Metal nanoparticles have been extensively used as co-catalysts in photocatalytic systems in order to pursue improvements in both reaction kinetics and selectivity. In this work, PdAg dual-metallic nanoparticles synthesized by the co-reduction method were decorated on a well-established α-Fe2O3/CdS Z-scheme photoactive material as a co-catalyst to study their performance for promoting the photoreduction of CO2. Herein, α-Fe2O3 and CdS were in situ synthesized on fluorine-doped tin oxide (FTO) glass by hydrothermal and SILAR (successive ionic layer adsorption and reaction) methods, respectively. The direct Z-scheme charge transfer path between Fe2O3 and CdS and the effective electron migration toward the PdAg mainly contributed to the excellent photocatalytic CO2 reduction performance. The controllable work function based on Pd (5.12) and Ag (4.26) constructed an appropriate band alignment with α-Fe2O3/CdS and displayed favorable production for CH4 rather than CO. The optimum ratio of PdAg 1:2 performed a 48% enhancement than pure Pd for photoreduction of CO2. Meanwhile, the enhanced charge separation improved the photoelectrochemical performance and photocurrent generation, and reduced the electrical resistance between components. This work provided insights into the dual-metallic co-catalyst for boosting the activity and selectivity of photocatalytic CO2 reduction.

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Enhanced Charge Separation in NiO and Pd Co-Modified TiO₂ Photocatalysts for Efficient and Selective Photoreduction of CO₂

Cited by 27 publications

References 36 publications

A Review on Nano Ti-Based Oxides for Dark and Photocatalysis: From Photoinduced Processes to Bioimplant Applications

A Review on Nano Ti-Based Oxides for Dark and Photocatalysis: From Photoinduced Processes to Bioimplant Applications

Hydrophobic Ni@N‐Doped TiO₂ Nanosheet Arrays‐Carbon Paper Photocatalyst for CO₂ Photoreduction at Tri‐Phase Interfaces

Decoration of PdAg Dual-Metallic Alloy Nanoparticles on Z-Scheme α-Fe2O3/CdS for Manipulable Products via Photocatalytic Reduction of Carbon Dioxide

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Enhanced Charge Separation in NiO and Pd Co-Modified TiO2 Photocatalysts for Efficient and Selective Photoreduction of CO2

Cited by 27 publications

References 36 publications

A Review on Nano Ti-Based Oxides for Dark and Photocatalysis: From Photoinduced Processes to Bioimplant Applications

A Review on Nano Ti-Based Oxides for Dark and Photocatalysis: From Photoinduced Processes to Bioimplant Applications

Hydrophobic Ni@N‐Doped TiO2 Nanosheet Arrays‐Carbon Paper Photocatalyst for CO2 Photoreduction at Tri‐Phase Interfaces

Decoration of PdAg Dual-Metallic Alloy Nanoparticles on Z-Scheme α-Fe2O3/CdS for Manipulable Products via Photocatalytic Reduction of Carbon Dioxide

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Enhanced Charge Separation in NiO and Pd Co-Modified TiO₂ Photocatalysts for Efficient and Selective Photoreduction of CO₂

Hydrophobic Ni@N‐Doped TiO₂ Nanosheet Arrays‐Carbon Paper Photocatalyst for CO₂ Photoreduction at Tri‐Phase Interfaces