JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
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IF 9.4
Shumail Farhan,Asif Hassan Raza,Songyu Yang,Zhixian Yu,Yan Wu
The advancement of highly effective heterojunction photocatalysts with improved charge separation and transfer has become a crucial scientific perspective for utilizing solar energy. In this study, we developed the S-scheme heterostructure by depositing N-doped CeO 2-δ (NC) nanoparticles onto two-dimensional ZnIn 2 S 4 (ZIS) nanosheets via hydrolysis strategy for significantly enhanced photocatalytic hydrogen evolution reaction. The optimal H 2 generation rate of ∼ 798 μmol g –1 h –1 was achieved for NC-3@ZIS under solar light irradiation, which is about 18 and 2 times higher than those of pristine CeO 2 (∼44 μmol g –1 h –1 ) and ZIS (∼358 μmol g –1 h –1 ), respectively. The photogenerated electrons from NC interact with the photogenerated holes of ZIS driven by an internal electric field, confirmed by In-situ KPFM, DFT calculation, and XPS results. According to EPR and photoelectrochemical measurements, NC-3@ZIS composite shows dramatically high separation efficiency of photogenerated charge carriers. This study provides a new approach for developing non-noble metal S-scheme heterojunctions with enhanced photocatalytic hydrogen evolution.
研究领域:
材料科学
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能源科学
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催化化学
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Junli Nie,Gangqiang Zhu,Weibin Zhang,Jianzhi Gao,Peng Zhong,Xiaotao Xie,Yu Huang,Mirabbos Hojamberdiev
Flower-like n -type CeO 2-δ is hybridized with p -type β-Bi 2 O 3 nanoparticles to design a novel β-Bi 2 O 3 /CeO 2-δ p - n heterojunction photocatalyst via a thermal treatment process of Bi/Ce(CO 3 )(OH) precursor. The synthesized β-Bi 2 O 3 /CeO 2-δ exhibits a remarkable enhancement in NO removal and significant suppression of toxic intermediates nitrogen dioxide (NO 2 ) under visible light irradiation. The superior photocatalytic activity of β-Bi 2 O 3 /CeO 2-δ for NO removal is mainly derived from the synergistic effects of the oxygen vacancies (OVs) and p-n heterojunction. The OVs not only enhance the visible light utilization and boost the separation of electron-hole pairs but also improve the adsorption and activation of NO and O 2 . Particularly, the p-n heterojunction is beneficial for the interfacial migration of photogenerated charge carriers. Electron spin resonance (ESR) and trapping experiment reveal that the synergistic effects of OVs and p-n heterojunction can induce the generation of more active species. The electrochemical measurements and density-functional theory (DFT) calculations in-depth confirm that both p-n heterojunction and OVs can accelerate the interfacial charge transfer, resulting in the deep oxidation of reactants. Therefore, the flower-like β-Bi 2 O 3 /CeO 2-δ p-n heterojunction photocatalyst exhibits an advanced photocatalytic activity for deep NO removal and a suppressed NO 2 generation. In addition, monitoring the reaction products by in situ Fourier transform infrared spectrum (FTIR) further validates that the main products of nitrates are formed during the photocatalytic process. This work demonstrates a straightforward approach for construction of p-n heterojunction photocatalysts, which can enhance the effective photocatalytic activity and stability for NO removal.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
FUEL
·
2023
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IF 7.4
Xiushuai Guan,Shanbiao Jin,Le Liu,Xiya Zhao,Xiaochao Zhang,Changming Zhang,Zhong Li,Caimei Fan
The utilization of oxygen vacancies to modulate the surface properties of catalysts is a powerful way to enhance catalytic activity. In this work, the doping effect of Bi 3+ on the performance of CeO 2−δ (Ce x Bi 1−x O 2−δ ) hybrid nanorods with rich oxygen vacancies for the photo-thermal synthesis of dimethyl carbonate (DMC) from CO 2 /CH 3 OH (140 ℃, 1.6 MPa, 4 h) is systematically investigated. It is found that Ce 0.9 Bi 0.1 O 2−δ exhibits the best catalytic performance, achieving a photo-thermal yield of 3.13 mmol∙g −1 without any dehydrating agent (1.14 times compared to thermal catalysis). It turns out that regulating the concentration of Bi 3+ ions not only modifies the oxygen vacancy content, but also improves the light harvesting efficiency. Moreover, a series of characterization techniques, such as X-ray photoelectron spectroscopy, Raman spectrometer and electron paramagnetic resonance are employed to analyze and verify that the asymmetric oxygen vacancies are conducive to the improvement in the CO 2 adsorption-activation. Finally, a possible reaction mechanism model of Bi 3+ doping on CeO 2−δ for the photo-thermal synthesis of DMC from CO 2 and CH 3 OH is proposed. This work provides a practical approach to catalyst surface engineering design.
研究领域:
材料科学
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催化化学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
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2017
·Vol. 5
·期 14
·6747-6755
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IF 8.867
Can Cao,Jian Xie,Shichao Zhang,Bin Pan,Gaoshao Cao,Xinbing Zhao
Lithium–oxygen (Li–O2) cells are receiving intense interest because of their extremely high energy density. A highly efficient catalyst for the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is a key factor influencing the performance of lithium–oxygen cells. In this work, we prepared a highly efficient CeO2-decorated δ-MnO2 (CeO2/δ-MnO2) catalyst which is composed of graphene-like δ-MnO2 with ultrafine CeO2 nanocrystals decorated on it. Li–O2 cells with the CeO2/δ-MnO2 catalyst exhibit superior electrochemical performance, including high discharge specific capacity (8260 mA h g−1 at 100 mA g−1), good rate capability (735 mA h g−1 at 1600 mA g−1), and excellent cycling stability (296 cycles at a limited capacity of 500 mA h g−1), which is much better than that with a bare δ-MnO2 catalyst. The achievement of excellent electrochemical performance is attributed to the highly efficient co-catalytic ability of δ-MnO2 and CeO2 and the desirable graphene-like architecture of the CeO2/δ-MnO2 catalyst, as well as the formation of the thin-layered discharge product Li2O2.
研究领域:
材料科学
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电化学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2016
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IF 3.205
Xiaona Ji,Xuejiao Liu,Xiaofeng Tong,Ting Luo,Hao Wu,Xie Meng,Zhongliang Zhan
Ceria–zirconia solid solution nanoparticulates, Ce 1− x Zr x O 2− δ ( x = 0, 0.2, 0.3, 0.4, 0.6, 0.8 and 1.0), are impregnated into the porous 430L stainless steel scaffolds and evaluated as the anode catalysts for solid oxide fuel cells (SOFCs). Combined analyses of X-ray diffraction and Raman scattering reveal the fluorite cubic ( c ) structure up to x ≤ 0.3 transforms to a mixture of the cubic and metastable tetragonal ( t ″) phases for 0.4 ≤ x ≤ 0.8, with the onset of tetragonal distortions at x = 0.8. Temperature-programmed reduction in H 2 indicates that doping Zr 4+ into the ceria lattice could improve the oxygen storage capacity. Nonetheless, the charge transfer process within the bulk Ce 1− x Zr x O 2− δ or across the interfaces of Ce 1− x Zr x O 2− δ |YSZ becomes increasingly sluggish at x ≥ 0.3. The two opposite effects yield the smallest anode polarization resistances at x = 0.3, e.g. , 0.08 ± 0.01 Ω cm 2 for Ce 0.7 Zr 0.3 O 2− δ versus 0.24 ± 0.02 Ω cm 2 for CeO 2− δ or 0.26 ± 0.04 Ω cm 2 for Ce 0.4 Zr 0.6 O 2− δ at 800 °C. Furthermore, thin YSZ electrolyte fuel cells with impregnated La 0.6 Sr 0.4 Fe 0.9 Sc 0.1 O 3− δ – YSZ cathode supports produce peak power densities of 1.24 W cm −2 at 800 °C for nano-Ce 0.7 Zr 0.3 O 2− δ @430L anodes, approximately 80% higher than 0.67–0.70 W cm −2 on nano-CeO 2− δ @430L or nano-Ce 0.4 Zr 0.6 O 2− δ @430L anodes.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
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