CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Yu Zhang,Yong Wang,Maoyun Di,Boye Zhou,Wei Xu,Niandu Wu,Yizhang Wu,Youwei Du,Wei Zhong
Atomically thin 2D carbon nitride sheets (CNs) can improve the photocatalytic performance due to their high specific surface area, exposed active sites, and nano-scaled diffusion path of the charge transferred to surface. However, in practical application, 2D CNs photocatalysts always suffer the low solar absorption. Here, we present a novel approach to achieve the ultrathin 2D CNs photocatalysts with wide spectrum absorption in visible-light range. The new method, i.e. thermal annealing of atomically thin CNs in Se vapor, can dramatically extend the absorption edge of the ultrathin CNs from 418 to 574 nm. Using structural characterization and spin-polarized density functional theory, we identify the loss of the nitrogen atoms at the edges and in situ Se doping into the network of ultrathin CNs, which could change the electronic band structure of the 2D CNs. As a consequence, the ultrathin 2D CNs photocatalyst via Se vapor annealing (Se-CNs) modified by Pt cocatalyst shows a superior photocatalytic hydrogen evolution activity under visible light irradiation. More significantly, the ultrathin Se-CNs photocatalyst also exhibits an impressive photocatalytic hydrogen evolution activity under visible-light irradiation in the absence of Pt cocatalyst. We believe that our study provide a facile and environmentally friendly strategy to realize the utilization of 2D CNs photocatalyst under wide spectrum range of solar radiation to harvest solar energy efficiently, and it can be further applied in various advanced fields, including CO 2 photoreduction, organic photosynthesis, and pollutant controls.
研究领域:
材料科学
·
光催化
·
纳米材料
·
能源化学
·
半导体物理
·
环境功能材料
✓ 已验证
DOI
高影响因子
CARBON
·
2020
·
IF 8.821
Qiong Liu,Fuxian Wang,Yu Jiang,Wei Chen,Ren Zou,Jiliang Ma,Linxin Zhong,Xinwen Peng
Photoreforming of lignocellulose for sustainable H 2 generation appears to be a good option at the time that biomass wastes are being degraded. Recently, polymeric carbon nitride (PCN) has emerged as a promising alternative for the photorefoming reaction, however, its photocatalytic performance is largely limited by its severe recombination of charge carriers. Here, we developed an approach, for the first time, to construct a curly-like carbon nitride nanosheets with the formation of in-plane surface dyadic heterostructure for steering the charge transfer and optimizing the electronic band structure . This PCN material shows superior photoreforming H 2 evolved activity of 122.77 μmolh −1 (i.e. 4092 μmolh −1 g −1 ) from the aqueous lignocellulose solution (using Pt as cocatalyst), 15.6 folds of pristine PCN under visible light irradiation, together with an apparent quantum efficiency (AQE) of 7.87% (λ = 420 nm). It enables the visible-light-driven conversion of several kinds of lignocellulose including the monosaccharides, disaccharides, hemicellulose , and cellulose . Additionally, when used as a photocatalyst for water splitting, it achieves a remarkable H 2 production rate of 22043 μmolh −1 g −1 (∼56.0 folds’ increases than pristine PCN) with a superior high AQE of 41.2%, as well as a high CO reduction rate of 56.3 μmolh −1 from the photocatalytic CO 2 conversion, 24.5 times than pristine PCN.
研究领域:
能源科学
·
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2025
·
IF 21.1
Xin-jie Zhao,Ying-jie Sun,Wei-hong Chai,Xiao-jing Wang,Jun Zhao,Yu-pei Li,Fa-tang Li
The spatial photoinduced charge separation and atomic H 2 evolution active site is decisive in the operating efficiency of the photocatalytic hydrogen evolution reaction, yet its rational design and synthesis remain a grand challenge. Here, a series of Hofmann-type coordination polymers (HCPs) with planar anionic block [Ni(CN) 4 ] 2- units were found to effectively enhance the photocatalytic H 2 evolution reaction (PHER) activity of transition metal sulfides (TMSs). This proof-of-concept study investigated four HCPs with planar anionic block [Ni(CN) 4 ] 2- units combined with different central transition metal ion (M 2+ : Ni, Co, Fe, and Mn). All four HCP-modified TMSs exhibited remarkable PHER activity of more than 20.0 mmol g −1 ·h −1 and an apparent quantum yield of ∼20 %, surpassing that of optimized Pt/Zn 0.5 Cd 0.5 S by more than 1.5-fold. Through spectroscopic characterization, Kelvin probe force microscopy (KPFM), and density functional theory (DFT) simulations, we confirmed that the [Ni(CN) 4 ] 2- units potentially bridged with the TMSs via an M-S bond forming an electronic transmission channel, thus eliminating the interface energy barrier. Due to the appropriate band structure, the photogenerated electrons converged to the [Ni(CN) 4 ] 2- units, consequently facilitating the conversion of H + to H 2 . This work demonstrates a rational synthetic route for creating PHER photocatalysts that possess mild synthesis conditions, efficient electronic transmission interfaces, and an active center that can be finely manipulated.
研究领域:
材料化学
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光催化
·
无机化学
·
能源科学
·
纳米材料
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表面科学
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED MATERIALS
·
2018
·Vol. 30
·期 35
·1801556
·
IF 21.95
Fucong Fei,Xiangyan Bo,Pengdong Wang,Jianghua Ying,Jian Li,Ke Chen,Qing Dai,Bo Chen,Zhe Sun,Minhao Zhang,Fanming Qu,Yi Zhang,Qianghua Wang,Xuefeng Wang,Lu Cao,Haijun Bu,Fengqi Song,Xiangang Wan,Baigeng Wang
The discovery of a new type-II Dirac semimetal in Ir 1− x Pt x Te 2 with optimized band structure is described. Pt dopants protect the crystal structure holding the Dirac cones and tune the Fermi level close to the Dirac point. The type-II Dirac dispersion in Ir 1− x Pt x Te 2 is confirmed by angle-resolved photoemission spectroscopy and first-principles calculations. Superconductivity is also observed and persists when the Fermi level aligns with the Dirac points. Ir 1− x Pt x Te 2 is an ideal platform for further studies on the exotic properties and potential applications of type-II DSMs, and opens up a new route for the investigation of the possible topological superconductivity and Majorana physics.
研究领域:
凝聚态物理
·
材料科学
·
拓扑量子物态
·
强关联电子系统
✓ 已验证
DOI
高影响因子
Materials Today Physics
·
2025
·
IF 9.7
Xinyu Wang,Yuzhi Zhang,Maofei Zhang,Rui Sun,Binghao Wang,Jiayu Ma,Hongyu Gu,Lingnan Wu,Lixin Song
The development of materials with both high solar reflectance and strong mid-infrared emissivity remains a major challenge. In this work, we report a ZrO 2 /SBA-15 hierarchical porous composite synthesized through a one-pot copolymerization strategy. By introducing Zr atoms into the SBA-15 framework and validating the mechanism using first-principles calculations, we achieve synergistic optimization of optical and structural properties. The incorporation of Zr suppresses defect states near the Fermi level, leading to a widened bandgap and enhanced reflectance in the UV–Vis region. The optimized 1.0ZrO 2 /SBA-15 composite exhibits an average solar reflectance of 96.8% across the 0.3–2.5 μm wavelength range and an emissivity of 0.986 in the 8–13 μm range. This study demonstrates an atomic-scale structural design strategy that combines experimental synthesis with electronic structure calculations, offering new insights into the rational development of inorganic porous composites with enhanced optical performance.
研究领域:
材料科学
·
纳米科技
·
光子学
·
表面科学
·
无机化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Nano
·
2025
·
IF 16
Weite Meng,Lixiang Xu,Shaoqing Lu,Mingquan Li,Mengyao Li,Yu Zhang,Qingyue Wang,Wen-Jun Wang,Siqi Huo,Miguel A. Bañares,Marisol Martin-Gonzalez,Maria Ibáñez,Andreu Cabot,Min Hong,Yu Liu,Khak Ho Lim
SnTe has attracted significant research interest as a lead-free alternative to PbTe; however, its intrinsically high hole concentration results in an undesirably low Seebeck coefficient and elevated electronic thermal conductivity, thus significantly limiting its thermoelectric (TE) performance. Herein, we present a cost-effective, binary thiol-amine-mediated colloidal synthesis method to synthesize Bi-doped SnTe nanoparticles, eliminating the use of tri-n-octylphosphine-based precursors. The introduction of an electron-rich Bi dopant reduces the hole concentration and increases the Seebeck coefficient. Furthermore, post-synthetic surface treatment with chalcogenidocadmate complexes promotes atomic interdiffusion during annealing and consolidation, leading to compositional redistribution and modulation of the electronic band structure. Density functional theory (DFT) calculations reveal that co-modification via Bi doping and CdSe-derived chalcogen incorporation reduces the energy offset at the valence band maxima from 0.30 eV to 0.10 eV, thereby enhancing valence band degeneracy. The synergistic structural and electronic band structure modulations produce an SnTe-based material with a record high power factor of 2.1 mW m–1 K–2 at 900 K, a maximum TE figure of merit (zT) of 1.2, and a promising theoretical conversion efficiency of 8.3%. This study reports a versatile and scalable colloidal synthesis strategy that integrates hierarchical structural modulation with electronic band engineering, offering a synergistic route to significantly enhance the TE performance.
研究领域:
材料科学
·
纳米科技
·
凝聚态物理
·
能源材料
·
半导体物理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
DALTON TRANSACTIONS
·
2015
·Vol. 44
·期 46
·19856-19864
·
IF 4.197
Kui Wu,Xin Su,Zhihua Yang,Shilie Pan
A series of new metal chalcongenides, BaCdSnSe4 (1), Ba2SnSe4 (2), Mg2GeSe4 (3), and Ba2Ge2S6 (4), were successfully synthesized for the first time. Among them, compounds 2 and 4 were prepared by a molten flux method with Zn as the flux. In their structures, all of them have MQ4 (M = Sn, Ge; Q = S, Se) units. For compound 1, the CdSe4 and SnSe4 groups are connected to form CdSnSe6 layers and these layers are linked together by the Ba atoms. Compounds 2 and 3 are composed of isolated MSe4 (M = Sn, Ge) units and charge-balanced by the Ba or Mg atoms, respectively, while compound 4 has infinite ∞(GeS3)n chains, which is different from the structures of the other three compounds that only have isolated MSe4 (M = Sn, Ge) units. The measured IR and Raman data of the title compounds show wide infrared transmission ranges. The experimental band gaps of compounds 1, 2, and 3 were determined to be 1.79, 1.90, and 2.02 eV, respectively. Band structures were also calculated and indicate that their tetrahedral units, such as [SnSe4], [GeS4] and [GeSe4], determine the energy band gaps of the title compounds, respectively. As for compound 1, based on fundamental light at 2.09 μm, the experimental second harmonic generation (SHG) response is about 1.6 times that of the benchmark AgGaS2, which is also consistent with the calculated value. Based on the above results, compound 1 has promising applications in the IR field as a NLO material.
研究领域:
材料科学
·
凝聚态物理
·
无机化学
·
光学工程
·
功能材料
✓ 已验证
DOI
高影响因子
Frontiers of Chemical Science and Engineering
·
2023
·Vol. 18
·期 2
·1-13
·
IF 4.5
Li Yuxin,Guo Junxin,Han Rui,Wang Zhao
Heteroatom doping and defect engineering have been proposed as effective ways to modulate the energy band structure and improve the photocatalytic activity of g-C 3 N 4 . In this work, ultrathin defective g-C 3 N 4 was successfully prepared using cold plasma. Plasma exfoliation reduces the thickness of g-C 3 N 4 from 10 nm to 3 nm, while simultaneously introducing a large number of nitrogen defects and oxygen atoms into g-C 3 N 4 . The amount of doped O was regulated by varying the time and power of the plasma treatment. Due to N vacancies, O atoms formed strong bonds with C atoms, resulting in O doping in g-C 3 N 4 . The mechanism of plasma treatment involves oxygen etching and gas expansion. Photocatalytic experiments demonstrated that appropriate amount of O doping improved the photocatalytic degradation of rhodamine B compared with pure g-C 3 N 4 . The introduction of O optimized the energy band structure and photoelectric properties of g-C 3 N 4 . Active species trapping experiments revealed ·O 2 − as the main active species during the degradation.
研究领域:
材料科学
·
纳米技术
·
催化
·
环境科学
✓ 已验证
DOI
高影响因子
Small
·
2024
·Vol. 20
·期 45
·2403852
·
IF 13
Xinxin Wang,Chao Wang,Yajing Wang,Min Hao,Shengqiang Cui,Xudong Huang,Chunhui Wang,Jing Chen,Zhenxiang Cheng,Jianli Wang
N-type PbSe thermoelectric materials encounter challenges in improving the power factor due to the single-band structure near the Fermi level, which obstructs typical band convergence. The primary strategy for enhancing the thermoelectric figure of merit (ZT) for n-type PbSe involves reducing lattice thermal conductivity (κ lat ) by introducing various defect structures. However, lattice mismatches resulting from internal defects within the matrix can diminish carrier mobility, thereby affecting electrical transport properties. In this study, n-type AgCuTe-alloyed PbSe systems achieve a peak ZT value of ≈1.5 at 773 K. Transmission electron microscopy reveals nanoprecipitates of Ag 2 Te, the room temperature second phase of AgCuTe, within the PbSe matrix. Meanwhile, a unique semi-coherent phase boundary is observed between the PbSe matrix and the Ag 2 Te nanoprecipitates. This semi-coherent phase interface effectively scatters low-frequency phonons while minimizing damage to carrier mobility. Additionally, the dynamic doping effect of Cu atoms from the decomposition of AgCuTe within the matrix further optimize the high-temperature thermoelectric performance. Overall, these factors significantly enhance the ZT across the whole temperature range. The ZT value of ≈1.5 indicates high competitiveness compared to the latest reported n-type PbSe materials, suggesting that these findings hold promise for advancing the development of efficient thermoelectric systems.
研究领域:
材料科学
·
凝聚态物理
·
能源材料
·
纳米结构工程
·
热电转换
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Jian Yu,Hongpan Zhu,Zizhen Zhou,Xiaofang Liu,Guang Han,Bin Zhang,Xu Lu,Guoyu Wang,Xiaoyuan Zhou
Mg-based compounds are emerging materials for efficient thermoelectric conversion, as exemplified by n-type Mg 3 Sb 2 -based materials, while a high performing p-type Mg 3 Sb 2 material is lacking. EuMg 2 Sb 2 , a derivative of Mg 3 Sb 2 , has revealed potential as a high-performance alternative to p-type Mg 3 Sb 2 -based materials, while pristine EuMg 2 Sb 2 suffers from low carrier concentration. Herein, we reveal that both Zn substitution for Mg and Yb substitution for Eu not only boost the carrier concentration and mobility of p-type EuMg 2 Sb 2 -based materials, but also sharply diminish the lattice thermal conductivity via enhancing phonon scattering. Band structure calculation shows that Zn substitution minimizes the energy difference between different bands at the valence band maximum and reduces the band effective mass, leading to optimized band structure. Combined with the role of Ag doping in increasing the carrier concentration and power factor, p-type Eu 0.5 Yb 0.5 Mg 1.0975 Zn 0.9975 Ag 0.005 Sb 2 sample obtains a maximal dimensionless figure of merit ( zT ) value of 1.18 at 823 K, which compares favorably to those of EuMg 2 Sb 2 and other p-type Mg–Sb-based Zintl materials. This study demonstrates the efficacy and importance of delicate composition engineering in boosting the thermoelectric performance of p-type EuMg 2 Sb 2 .
研究领域:
材料科学
·
热电学
·
固体物理
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Yange Li,Zhenlong Zhang,Huafang Zhang,Yuefeng Liu,Huiping Gao,Yanli Mao
Most of the reported perovskite solar cells (PSCs) with high efficiency are based on the (100) facet-dominated FAPbI3 perovskite films due to their easy formation. Recent reports demonstrate that the (111) facet is more stable and more invulnerable to cationic migration than the (100) one. However, the fabrication of (111) facet-dominated perovskite is challenging. Herein, we prepared the (111) facet-dominated perovskite films by a two-step method. In the first step, an additive of 6,6′-dimethyl-2,2′-bipyridyl (DMBP) was added to the PbI2 solution, which interacts with PbI2 by a chemical bonding between Pb+ and N– in its pyridine rings, regulating the microstructure of the PbI2 film. The experimental results demonstrate that the obtained perovskite film is (111) facet-dominated. Moreover, the DMBP additive reduces the number of defects and improves the energy band structure of the perovskite. The devices based on the (111) facet-dominated perovskite achieve a high efficiency of 24.11%, which is larger than that of the control (22.55%). In addition, the stability of the devices is enhanced by the DMBP additive.
研究领域:
材料科学
·
纳米技术
·
光伏技术
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2018
·
IF 2.207
Hongyu Shi,Na Li,Zhixia Sun,Tianqi Wang,Lin Xu
TiO 2 nanoparticles are commonly used as versatile precursors to make functional nanocomposite materials. However, the surface defects at grain boundaries of TiO 2 nanoparticles significantly affect the photoelectric properties of TiO 2 nanomaterials . In this work, we firstly prepared nanocomposites of TiO 2 and polyoxometalates (POMs) in which different POMs, including titanium-substituted POMs K 5 [PW 11 TiO 40 ] and K 7 [PW 10 Ti 2 O 40 ], are incorporated with TiO 2 nanoparticles so as to make an interface modification on grain boundaries of TiO 2 nanoparticles. Then the photoconductivities of the TiO 2 /POM nanocomposites were investigated through measurement of photocurrent responses, current-voltage curves, Mott-Schottky plots and surface photocurrent spectra. Compared with pure TiO 2 nanoparticles, TiO 2 /POM nanocomposites exhibit superior photoelectric properties, benefitting from the interface modification from different POMs. The gas sensing performance for acetone was also explored by use of the as-prepared photoconductive devices, and TiO 2 /PW 11 Ti exhibited a high gas sensing performance.
研究领域:
材料科学
·
纳米科技
·
半导体物理
·
传感器技术
·
光电子学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）