NEW JOURNAL OF CHEMISTRY
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2022
·Vol. 46
·期 29
·14043-14051
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IF 3.925
Hele Liu,Pengfei Tan,Huanhuan Zhai,Mingyuan Zhang,Jiaoyang Chen,Ruifeng Ren,Ziyu Wang,Jun Pan
Developing economic and high-performance noble metal-free photocatalysts is the key to realize efficient photocatalysis. In this work, NiS nanoparticles and hierarchical Sn3O4 nanostructures are tightly bonded by a two-step method combining hydrothermal and ion precipitation to construct a 0D/3D nanocomposite structure, which accelerates the interface electron transfer rate and photogenerated electron–hole separation efficiency. Compared with the pure Sn3O4, the loaded samples obviously have stronger light absorption capacity and effectively improve the utilization of visible light, thus showing enhanced photocatalytic hydrogen generation performance. NiS provides more active sites on the surface and facilitates electron transit as an electron acceptor, resulting in increased photocatalytic activity. As a result, when the loading of NiS reaches 1.0%, the photocatalyst shows an excellent hydrogen production performance, with an average hydrogen generation rate of 17.43 μmol g−1 h−1, which is 2.4 times than that of the pristine Sn3O4. This research offers a new idea to develop noble metal-free photocatalysts with high activity.
研究领域:
材料科学
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能源科学
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DOI
高影响因子
Journal of Energy Chemistry
·
2022
·
IF 13.599
Wen Li Jia,Wen Jing Li,Hai Yang Yuan,Xuefeng Wu,Yuanwei Liu,Sheng Dai,Qilin Cheng,Peng Fei Liu,Hua Gui Yang
Surface modification by metal ion has been considered a promising strategy to enhance the photocatalytic activity by extending optical response and improving charge separation and transportation. Here, univalent copper species were modified on ZnIn 2 S 4 photocatalyst via an in-situ photodeposition method, exhibiting a much higher H 2 evolution rate of 41.10 ± 3.43 mmol g −1 h −1 and an impressive apparent quantum efficiency (AQE) of 20.81% at 420 ± 15 nm. Our characterizations indicate that the surface modification by copper species can broaden light utilization as well as promote charge separation and transportation. Besides, the density functional theory (DFT) results further exhibit that the energy levels (LUMO and HOMO) for copper-surface modified ZnIn 2 S 4 present spatial separation, locating on the Zn-S and In-S layers, respectively, which can suppress the recombination of electron and hole and thus achieves higher photocatalytic H 2 evolution efficiency.
研究领域:
材料科学
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能源化学
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理论计算
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Ruolan Li,Xingyan Liu,Yacen Tang,Jianning Yu,Ya Chen,Min Fu,Siqi Li,Youzhou He
In this study, a highly efficient bifunctional porphyrin-based MOFs with uniformly in-situ generated g-C 3 N 4 quantum dots (g-CNQDs) was fabricated for photocatalytic hydrogen evolution and NO removal, in which PtTCPP as the organic ligand and mixed Zr/Ti-oxo clusters as the metal nodes. Compared with most reported Zr-based porphyrin MOFs, the g-CNQDs@Zr-MOFs(Pt)(Zr/Ti) exhibited outstanding hydrogen evolution activity (14511.57 μmol g −1 ) and NO removal rate (31.9 %) under visible light irradiation. The obviously improved photocatalytic performance could be attributed to the significantly enhanced charge separation and transfer rates by the mixed Zr/Ti-oxo clusters via the rapid Ti 3+ /Ti 4+ process. Moreover, the uniformly in-situ generated g-CNQDs via confinement effect in the cavity of MOFs could also improve the utilization of visible light especially through the up-conversion effect, and promote charge carriers separation. This work provides an idea for us to expand the scope of light utilization and promote charge transfer and separation rates of MOFs via functionalizing host MOFs matrix and coupling guest active species to improve photocatalytic performance further.
研究领域:
材料科学
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环境科学
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化学
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产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Mengjie Yao,Hao Yu,Kai Ding,Zhengyang Du,Wenhui Zhang,Yun Xia,Xiaoying Pan,Wensong Wang,Xiang Liu,Shenjie Li,Yanyan Chen
With a high porosity and highly adaptable topology, ZIF-67 is considered the most promising photocatalyst and has received much attention and development. However, the photoactive electron extraction rate of ZIF-67 is still low, which is a major problem limiting its further development. In this paper, based on the type I structure and using quantum dots (QDs) as the active site, we obtain the QDs@ZIF-67/ZIF-8 heterostructure, which ensures high-yield hydrogen efficiency. Quantum dots, as the transmission site of photogenerated electrons, improve the photogenerated carrier utilization rate generated by the strong absorption ability of ZIF-67 in the visible-light region. Through careful characterization, it was found that the optimal photocatalytic rate of 4999.7 μmol·g–1·h–1, a value 30 times higher than that of QDs, provides an innovative band gap-matching design for adjusting the charge transfer characteristics of QDs with a narrow band gap, which realizes the efficient utilization of visible light.
研究领域:
材料科学
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能源科学
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化学工程
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产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2016
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IF 8.328
Jing Hu,Haiqiang Wang,Fan Dong,Zhongbiao Wu
Photothermal effect was for the first time utilized to capture the energy from infrared light and to promote the photocatalytic oxidation activity of NO by a simply mechanical mixing of traditional photocatalysts and core-shell structured Fe 3 O 4 @SiO 2 . Fe 3 O 4 @SiO 2 absorbed the infrared light, transferred it into thermal energy based on photothermal effect, which then accelerated the NO photocatalytic activity of traditional photocatalysts. This promotion effect led by the addition of Fe 3 O 4 @SiO 2 was confirmed by several classical photocatalysts such as TiO 2 , g-C 3 N 4 , BiOI and CeO 2 . To quantitatively characterize the photothermal effect, thermo images were taken with a thermo imager to obtain the average temperature rise of samples under the illumination of simulated solar light. Specially, P25/Fe 3 O 4 @SiO 2 was studied in depth for illustration of the promotion mechanism. Experimental results showed that with the contribution of SiO 2 shell, the photocorrosion of Fe 3 O 4 didn’t occur during photocatalytic oxidation process and the photothermal effect of Fe 3 O 4 was maintained. The quantity of Fe 3 O 4 @SiO 2 was a vital factor for promotion of photocatalytic activity and the optimum mass ratio of P25 and Fe 3 O 4 @SiO 2 was 3–1. After 120 min of illumination, the temperature of optimum P25/Fe 3 O 4 @SiO 2 rose to 57.4 °C from 25 °C and its NO conversion capability showed an enhancement of 38.9% with the comparison to pure P25. The experimental results confirmed that the rise of temperature was attributed to the photothermal effect and its contribution was the same as the directly heating of photocatalysts. Furthermore, the enhancement of NO conversion capability around 30–40% was observed for the Fe 3 O 4 @SiO 2 mixed anatase TiO 2 , g-C 3 N 4 , ZnO, BiOI and CeO 2 . In sum, we developed a new strategy for utilization of NIR light of solar energy to facilitate the photocatalytic reactions.
研究领域:
环境科学
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材料科学
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光催化
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Chemistry
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2024
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IF 6.7
Jiaru Peng,Tianze Han,Qian Liu,Wenqian Luan,Ruiyang Zhao,Jishu Han,Lei Wang
The development of efficient composite photocatalyst to decompose water and produce hydrogen utilizing solar energy is the important measure to achieve carbon neutrality. Herein, hollow CuCo 2 O 4 double-shell nanospheres were obtained by calcination in air, and then modified with Mn 0.2 Cd 0.8 S in different mass ratios to obtain hollow CuCo 2 O 4 –Mn 0.2 Cd 0.8 S double-shell nanospheres. When the mass ratio of CuCo 2 O 4 and Mn 0.2 Cd 0.8 S was 1:10, the photocatalytic hydrogen production rate reached to 25.17 mmol g −1 h −1 without noble metal cocatalyst. The high photocatalytic performance of CuCo 2 O 4 –Mn 0.2 Cd 0.8 S benefited from the hollow structure of CuCo 2 O 4 and the formation of type-I heterostructure, which increased the utilization rate of visible light, accelerated the electrons transfer and reduced the recombination of electron and hole. Meanwhile, CuCo 2 O 4 nanospheres provided the support for Mn 0.2 Cd 0.8 S and reduced the agglomeration phenomenon of Mn 0.2 Cd 0.8 S, thus exhibiting good photostability. This research provided a new insight for constructing efficient hollow composite photocatalyst.
研究领域:
材料科学
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能源科学
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环境科学
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产品关联
DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2025
·
IF 1.6
Zhu Ye’an,Qiu Jialin,Zhang Zimeng,Nie Yidan,Wang Bo,Peng Li,Song Zengkai,Xie Zongbo,Le Zhanggao
The photocatalytic conversion of U(VI) to a lower oxidation state is essential in environmental cleanup, with g-C 3 N 4 being a leading photocatalyst candidate. However, the application of conventional bulk g-C 3 N 4 is limited by its low specific surface area, high rates of photogenerated carrier recombination, and limited utilization of visible light. This study presents a novel synthetic approach, termed “thermal polymerization-acidification-annealing,” that uses urea to prepare modified g-C 3 N 4 samples. Notably, the CN-3 sample has a coral-like porous structure, which significantly increases its specific surface area and reduces the bandgap, thereby improving its photocatalytic performance. Under 100 min of visible light irradiation, the CN-3 sample achieved a 95.5% reduction of U(VI) in solution, which is 2.5 times more efficient than conventional g-C 3 N 4 . The material also demonstrated excellent stability and reusability, maintaining nearly 90% reduction in U(VI) after five consecutive photocatalytic cycles. These results highlight the importance of morphological engineering for enhancing the photocatalytic performance of g-C 3 N 4 and provide a viable strategy for developing efficient and durable materials for environmental and energy applications.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
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2015
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IF 4.504
Niu Huang,Lin Chen,Hua Huang,Weiwei Sun,Shouzheng Zhang,Panpan Sun,Xiaohua Sun,Peng Xiang,Yihua Sun,Xingzhong Zhao
TiO 2 pyramids with planar-surface morphology presenting in the phases of anatase and brookite are successfully prepared, the height of which is 300-500 nm and 80-200 nm wide at the bottom. The pyramids exhibit excellent reflectance in the visible-near infrared region. When introducing the pyramids as a scattering layer covering the layer composed of TiO 2 nanoparticles , the energy conversion efficiency of dye-sensitized solar cell (DSSC) is enhanced from 6.49% to 7.25%. However, the pyramids overlayer falls from the nanoparticles underlayer easily, and the fill factor of the DSSC with the pyramids layer also become much lower. To solve the problem, we substitute TiO 2 microspheres underlayer for NP underlayer. As the tips of pyramids could be inserted into the submicron-sized gaps between the TiO 2 microspheres, the interface connection between layers of photoanode is reinforced. Current-Voltage measurement shows that the fill factor of the DSSC is much improved, and the DSSC has achieved 8.35% energy conversion efficiency. This study shows that the novel bilayer photoanode with improved light utilization and interface connection is an interesting structure for high efficiency DSSCs.
研究领域:
材料科学
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能源技术
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Haodong Sun,Zuoyi Xiao,Zhenyu Zhao,Yingjie Huang,Shangru Zhai,Qingda An
The construction of an efficient and recyclable photocatalyst for the degradation of antibiotics is still a challenge. In this work, we successfully synthesized porous carbon-supported CaWO 4 nanoparticles (CaWO 4 @C) by solidifying sodium alginate (SA) mixed with Na 2 WO 4 by Ca 2+ ions and subsequent high-temperature carbonization . The introduction of porous carbon significantly reduced the size of CaWO 4 particles, increased the specific surface area for mass transport, and improved visible light utilization. The influence factors of photocatalytic activity were extensively explored through photocatalytic degradation of tetracycline (TC). As a result, the optimized CaWO 4 @C exhibited excellent photocatalytic performance with the TC degradation rate of 94.56% after 60-min visible light irradiation. The TC photodegradation rate constant was calculated to be 0.051 min −1 , which was 30.19-time higher than the pristine CaWO 4 . Besides, the photocatalytic reaction mechanism for degradation of TC was revealed in terms of free radical trapping experiments and electron spin resonance (ESR) techniques.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
CARBON
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2016
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IF 6.198
Kui Li,Xin Xie,Wei-De Zhang
Graphitic carbon nitride-based nanocomposites hold great promise in photocatalysis . In this study, nanocomposites based on graphitic carbon nitride-encapsulating carbon spheres (CS/g-C 3 N 4 ) were facilely fabricated through polymerization of melamine from the carbon spheres. The incorporation of carbon spheres in g-C 3 N 4 leads to enlarged contact area and strengthened interaction between the two π-conjugated components. The CS/g-C 3 N 4 composites exhibit large specific surface area, improved visible light utilization, more negative potential of conduction band , and enhanced separation of photo-generated charge carriers. The optimized CS/g-C 3 N 4 composite displays a hydrogen evolution rate of 50.2 μmol h −1 , which is almost 4.8 times of that over the pure g-C 3 N 4 . The structures and morphologies of the catalysts can be maintained after photocatalytic reaction. This approach may stimulate a new way to construct g-C 3 N 4 -based nanocomposites with other carbon materials.
研究领域:
材料科学
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光催化
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产品关联
DOI
高影响因子
Nano-Micro Letters
·
2020
·Vol. 12
·期 1
·1-13
·
IF 12.264
Liu Sisi,Li Ming-Yu,Zhang Jianbing,Su Dong,Huang Zhen,Kunwar Sundar,Lee Jihoon
AbstractSection
Highlights
High performance Al nanostructures/ZnO quantum dots heterostructure photodetectors with a controllable geometry of the Al nanostructures are demonstrated.
Light utilization of the photoactive layers is significantly boosted with the Al nanostructures.
The light confinement effect is inherently determined by the geometries of the Al nanostructures.
AbstractSection
Abstract
Light confinement induced by spontaneous near-surface resonance is inherently determined by the location and geometry of metallic nanostructures (NSs), offering a facile and effective approach to break through the limitation of the light-mater interaction within the photoactive layers. Here, we demonstrate high-performance Al NS/ZnO quantum dots (Al/ZnO) heterostructure UV photodetectors with controllable morphologies of the self-assembled Al NSs. The Al/ZnO heterostructures exhibit a superior light utilization than the ZnO/Al heterostructures, and a strong morphological dependence of the Al NSs on the optical properties of the heterostructures. The inter-diffusion of Al atoms into ZnO matrixes is of a great benefit for the carrier transportation. Consequently, the optimal photocurrent of the Al/ZnO heterostructure photodetectors is significantly increased by 275 times to ~ 1.065 mA compared to that of the pristine ZnO device, and an outstanding photoresponsivity of 11.98 A W −1 is correspondingly achieved under 6.9 mW cm −2 UV light illumination at 10 V bias. In addition, a relatively fast response is similarly witnessed with the Al/ZnO devices, paving a path to fabricate the high-performance UV photodetectors for applications.
研究领域:
材料科学
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光学工程
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纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CATALYSIS
·
2019
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IF 7.723
Ying-Chu Chen,Zhi-Jie Wu,Yu-Kuei Hsu
Multiple heterojunction made of CuO nanocrystals building on ZnO scaffold buffered by an In 2 O 3 interlayer is fabricated through simple wet chemistry. Scanning and transmission electron microscopy reveal this CuO/In 2 O 3 /ZnO heterojunction forming multi-core-shell nanostructure. X-ray photoelectron spectroscopy is performed to analyze the chemical compositions. Such system is further employed in sunlight-driven photoelectrochemical water splitting, wherein Mott-Schottky analysis demonstrates its flat-band potential negatively shifted. This originates from the lower electron affinity of CuO compared to that of ZnO, favoring photocurrent generation at early onset potential. More importantly, the entire gamut of visible-light is harnessed by CuO, as manifested in the photocurrent action spectrum. Last but not least, the charge-separation is promoted at the In 2 O 3 interface, as reflected in the impedance measurement. The synergistic effect endows the CuO/In 2 O 3 /ZnO photoelectrode with the highest photocurrent of 1.22 mA⋅cm −2 (at ∼1.6 V vs. RHE) that outperforms those of the CuO/ZnO and ZnO photoanodes, respectively.
研究领域:
材料科学
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能源科学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）