Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 19
·9057-9063
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IF 9.931
Xu Zhang,Yu-Zhu Zhou,De-Yao Wu,Xiao-Hua Liu,Rui Zhang,Hui Liu,Cun-Ku Dong,Jing Yang,Sergei A. Kulinich,Xi-Wen Du
Zinc oxide is a cost-efficient and eco-friendly material for solar-to-chemical energy conversion. However, the relatively wide band gap and poor stability restrict its practical applications. Herein, we report on the modification of ZnO nanosheets with a porous atomically thin ZnS overlayer. The as-prepared ZnS/ZnO/ZnS sandwich nanosheets exhibit a reduced band gap (2.72 eV) and yet a slightly elevated conduction band minimum, which remarkably broadens the wavelength range for light absorption and generates electrons with enough reducing capability. At the same time, the newly-prepared sandwich nanosheets possess alternatively exposed ZnS and ZnO surface patches, which attract and accommodate photo-generated holes and electrons, respectively. In addition, the ZnS overlayer catalyzes and accelerates hole-consumption reactions, thus preserving electrons for efficient water splitting. As a result, the ZnS/ZnO/ZnS sandwich nanosheets demonstrate intensive light absorption, fast charge separation, long electron lifetime, and eventually the highest hydrogen production rate reported for oxide catalysts so far. This work proves that passivation with an ultrathin layer is a potent approach for energy-band engineering, and semiconductor sandwich nanostructures are promising for highly efficient water splitting under sunlight.
研究领域:
材料科学
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能源转换
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光催化技术
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DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
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2022
·Vol. 24
·期 45
·27812-27818
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IF 3.945
Juan Li,Fei Jia,Kai Han,Bing Sun,Lianzhen Cao,Yingde Li,Shuai Zhang
Experimental results show an intriguing phenomenon that although Bi and Sb have the same number of valence electrons, Bi/Sb substitution increases the electron concentration of n-type Mg3Sb2-based materials. Using a combination of theoretical calculations and experimental synthesis, this work reveals the physical mechanism of the effect of Bi doping on carrier concentration. The increase in electron concentration mainly originates from the enhanced degree of ionization of donor impurity because of the decrease of conductivity effective mass and increase of dielectric constant caused by the narrowing of bandgap with Bi doping. Based on the collaborative optimization of the electrical and thermal transports, n-type Mg3.175Mn0.025Sb1.48Bi0.48Te0.04 exhibits the best thermoelectric performance with a peak zT of 1.85 at 725 K and an average zT of 1.21. This work demonstrates an effective strategy of bandgap engineering for the optimization of carrier concentration and provides insightful guidance for designing other thermoelectric materials.
研究领域:
材料科学
·
凝聚态物理
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DOI
高影响因子
Joule
·
2025
·
IF 35.4
Xuemei Ma,Dianwei Zhang,Hongwei Fu,Apparao M. Rao,Jiang Zhou,Ling Fan,Bingan Lu
The solid electrolyte interphase (SEI) critically governs the performance of potassium-ion batteries (PIBs). However, present-day SEIs cannot prevent persistent parasitic reactions between the electrode and electrolyte due to SEI’s low energy band gap and high ion migration energy barrier. Here, we propose an SEI energy band engineering strategy by screening the band-gap width and migration energy barrier of various SEI components, and we found that the Si-O-SEI simultaneously increases SEI’s energy band gap and lowers the ion migration energy barrier to enable good electron-blocking capability and high K + ion diffusion. Our Si-O-SEI prepared in situ on the electrode surface, using a simple additive, enables carbonate-based electrolytes to achieve a highly reversible potassium plating and stripping with a Coulombic efficiency (CE) of 99.2%, together with the upgraded reversibility of the graphite anode. SEI composition and structural modulation through a simple and generic strategy provide a valuable research platform for developing high-performance PIB electrolytes.
研究领域:
材料科学
·
电化学
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Xinglin Jia,Jianan Li,Yuhong Liu,Wenzhong Wang,Yujie Li,Lei Liu,Huabin Chen,Guling Zhang,Sitong Liu,Qing Zhou,Lijuan Wang
A novel CdS/CdSe/Cu 2 O nanorod array (NRA) photoelectrode with cascading charge transport channels was designed for the first time to remarkedly boot photoelectrochemical (PEC) hydrogen generation under visible light illumination with zero bias. This ternary photoelectrode was constructed by modifying CdS nanorod arrays with n-type CdSe and p-type Cu 2 O nanoparticles , successively. In this novel photoanode , CdSe and Cu 2 O with small band gap not merely highly heighten the visible light absorption capacity of CdS, but more importantly integrate with CdS to build cascading charge transport channels at the CdS/CdSe and CdSe/Cu 2 O interfaces, dramatically facilitating the separation and transport efficiency for photoexcited electron and hole pairs. The CdS/CdSe/Cu 2 O NRA photoelectrode gains an obvious hydrogen generation rate of 193.2 μmol·h −1 , 8.2 times higher than that of bare CdS NRA photoelectrode. The remarkably enhanced PEC hydrogen production for the CdS/CdSe/Cu 2 O NRA photoanode can be ascribed to effective solar energy utilization and charge carrier separation.
研究领域:
材料科学
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能源科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Nano
·
2024
·
IF 15.8
Lu Yu,Xiao-Lei Shi,Yuanqing Mao,Wei-Di Liu,Zhen Ji,Sitong Wei,Zipei Zhang,Weiyu Song,Shuqi Zheng,Zhi-Gang Chen
Incorporating donor doping into Mg3Sb1.5Bi0.5 to achieve n-type conductivity is one of the crucial strategies for performance enhancement. In pursuit of higher thermoelectric performance, we herein report co-doping with Te and Y to optimize the thermoelectric properties of Mg3Sb1.5Bi0.5, achieving a peak ZT exceeding 1.7 at 703 K in Y0.01Mg3.19Sb1.5Bi0.47Te0.03. Guided by first-principles calculations for compositional design, we find that Te-doping shifts the Fermi level into the conduction band, resulting in n-type semiconductor behavior, while Y-doping further shifts the Fermi level into the conduction band and reduces the bandgap, leading to enhanced thermoelectric performance with a power factor as high as >20 μW cm–1 K–2. Additionally, through detailed micro/nanostructure characterizations, we discover that Te and Y co-doping induces dense crystal and lattice defects, including local lattice distortions and strains caused by point defects, and densely distributed grain boundaries between nanocrystalline domains. These defects efficiently scatter phonons of various wavelengths, resulting in a low thermal conductivity of 0.83 W m–1 K–1 and ultimately achieving a high ZT. Furthermore, the dense lattice defects induced by co-doping can further strengthen the mechanical performance, which is crucial for its service in devices. This work provides guidance for the composition and structure design of thermoelectric materials.
研究领域:
材料科学
·
物理学
·
纳米技术
✓ 已验证
DOI
高影响因子
ACS Applied Energy Materials
·
2019
·
IF 0
Haiping Li,Yuguo Xia,Zhiwei Liang,Guiming Ba,Wanguo Hou
Metal doping is a valid strategy to increase simultaneously photoabsorption, the charge separation efficiency, and thus the photocatalytic activity of polymeric carbon nitride (CN); however, metal elements in groups IIIA–VA in the periodic table are rarely researched in doping CN. Herein, indium (In)-doped CN (In:CN) was first synthesized with In3+ ions inserted in the interlayer, approaching the cavities in the monolayer sheets, and fixed through coordination with nitrogen atoms around them. In:CN exhibits a higher photoabsorption, specific surface area, charge separation and transfer efficiency, and photocatalytic performance in H2 generation and environmental remediation than bulky CN. The H2 generation and rhodamine B decomposition rates for In:CN are ∼2.9 and 4.6 times those for CN, respectively. The apparent quantum yield (420 nm) of In:CN for H2 production can reach 6.8%. The enhancement in charge separation plays an indispensable role for the photoactivity increase of In:CN, which originates from the generation of an impurity level above the valence band edge in the bandgap because of the In doping, i.e., the In3+-coordination structure works as a hole-capture center. This paper supplies an easy method for CN modification and illustrates the mechanism for In-doping-induced change of the energy band structure, which may guide the preparation of other CN-based photocatalysts with metal doping.
研究领域:
材料科学
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光催化
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能源化学
·
环境修复
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半导体物理
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纳米材料
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功能高分子
✓ 已验证
DOI
ADVANCED FUNCTIONAL MATERIALS
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2025
·
IF 19
Jiafei Ren,Xing Huang,Ruolin Han,Yuxin Sun,Guangxin Chen,Qifang Li,Zheng Zhou
In recent years, driven by flexible electronics and robotics, multimodal sensors have developed rapidly. Although the coupling between signals is effectively improved, the limited resolution restricts their application in complex scenarios. Herein, inspired by the human cutaneous sensory system, a multimodal tactile sensor with a lamellar aerogel structure is fabricated by using Ti 3 C 2 T x MXene and carboxyl single-walled carbon nanotube as conductive building blocks. The synergistic sensing mechanism based on piezoresistive and thermoelectric effects enables it to decouple pressure and temperature stimuli fully. Benefiting from the micro-nano conductive network constructed by the bridged lamellae combined with nano building blocks and the interfacial energy filtering induced by the design and regulation of the band structure, the sensor achieves unprecedented breakthroughs in pressure detection limit and temperature resolution, reaching 0.025 Pa and 0.01 K, respectively. Furthermore, tactile perception beyond humans is achieved by combining the outstanding multimodal sensing properties with machine learning. The developed intelligent robotic finger performs a high material identification accuracy of 97.9%, and the further integrated electronic skin that can achieve multi-feature classification under low pixels has an accuracy of up to 99.7%. This study provides novel insights into the design and application of multimodal sensors with high resolution.
研究领域:
柔性电子学
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机器人技术
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传感器技术
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纳米材料
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人工智能
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Qinghui Jiang,Hui Long,Xianwei Zeng,Bo Wang,Boyu Yang,Jitao Yi,Yubo Luo,Junyou Yang,Haitao Ye,Yong Liu
BiCuSeO, an oxide thermoelectric material with a superlattice structure, presents the advantages of affordability, low toxicity, and environmental friendliness . However, its intrinsic low electrical conductivity has impeded its possible applications. To address this challenge, we put tiny PbZr 0.52 Ti 0.48 O 3 (PZT) with varying weight percentages ( x = 0, 5, 7, 9, 11) into BiCuSeO (BCSO) to fabricate thermoelectric nanocomposites . Through the spark plasma sintering process, PZT particles underwent in-situ decomposition, generating nano-sized second phases such as PbO 2 , TiO 2 , and PbZrO 3 , which are homogenously distributed within BCSO matrix (validated by XRD and TEM). The introduced PbO 2 , TiO 2 , and PbZrO 3 second phases served a dual purpose: inhibiting the grain growth of BCSO and introducing additional nano-grain boundaries. This resulted in more effective phonon scattering sites, thereby reducing lattice thermal conductivity . Simultaneously, the Pb element derived from PZT decomposition was doped into the Bi site of the BCSO matrix, causing a reduction in the band gap of BCSO from 0.49 eV to 0.388 eV and a significant increase in carrier concentration. Consequently, this doping enhanced the electrical conductivity of BCSO-based composites, with the composite with 11 wt% PZT additive amount exhibiting a remarkable 318-fold increase, reaching 550 S/cm compared to pristine BCSO. Notably, the composite with 7 wt% PZT additive amount achieved an exceptionally low lattice thermal conductivity of 0.333 W m −1 K −1 at 823 K. Through the synergistic optimization of electrical and thermal transport properties, the BCSO-based composite with 7 wt% PZT additive amount obtained a ZT value of ∼0.9 at 873 K, representing a 2.45-fold increase compared to pristine BiCuSeO. This straightforward method presents a cost-effective and scalable approach to enhance the thermoelectric performance of various materials, opening new avenues for potential commercial applications.
研究领域:
材料科学
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热电学
·
纳米技术
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Ze Li,Yidan Fu,Lina Han,Pengfei Zheng,Xiaoyuan Zeng,Peng Dong,Jing Feng,Yingjie Zhang
The insufficient d-electron density in V metal atoms limits O2 dissociation, constraining the kinetics and activity of the oxygen reduction reaction and the oxygen evolution reaction in VN-based catalysts. Herein, Co dopant was employed to modulate the electronic characteristics of the d-orbitals and associated free energy of VN, thereby further enhancing its catalytic activity. XPS and XANES spectra revealed that Co atoms replaced V and strongly bonded with neighboring N atoms, effectively regulating the local electronic structure. DFT analysis show that the Co doping strategy effectively regulates the adsorption/desorption equilibrium of oxygen reduction reaction intermediates through d-electron transfer to V atoms, while significantly lowering the activation energy barrier of the rate-determining step. Electrochemically, V0.95Co0.05N/NC/C achieved a low bifunctional index (ΔE = 0.78 V), with a half-wave potential for the ORR of 0.83 V and an OER overpotential of 380 mV at 10 mA cm–2. In Zn-air batteries, it achieved a high specific capacity (708.98 mAh gZn–1) and retained 88% initial voltage after 280 h cycling, demonstrating robust stability for practical applications. This study presents a doping strategy to modulate d-band centers in transition metal nitrides for energy conversion devices.
研究领域:
电化学
·
材料科学
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能量转换
·
催化
·
纳米技术
·
电池技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Xiaopeng Wei,Jiaxing Qi,Yangchun Mo,Bitao Chen,Guoyuan Zheng,Shuyi Mo,Jilin Wang,Disheng Yao,Nan Tian,Fei Long
This paper reports two copper-based organic–inorganic hybrid perovskite single crystals, (2A5MP)2CuX4 (X = Cl, Br), synthesized by a halogen-regulated method. Through comprehensive characterization (single-crystal XRD, powder XRD, FTIR, Raman spectroscopy, TGA, and UV–vis DRS), we elucidated crystal structures, intermolecular forces, functional groups, bond configurations, optical properties, and thermal stability. Both compounds crystallized in the monoclinic space group C2/c. (2A5MP)2CuCl4 has an optical band gap of 2.47 eV and is stable up to 172 °C, while (2A5MP)2CuBr4 has a band gap of 1.66 eV with a stability of up to 185 °C. When Br– occupies the X site, (2A5MP)2CuBr4 exhibits an optical band gap (1.66 eV) close to the optimal value for solar cell absorbers. Furthermore, replacing Cl– with Br– enhances thermal stability by 13 °C. Therefore, (2A5MP)2CuBr4 demonstrates significant potential as a light-absorbing layer for solar cells.
研究领域:
材料科学
·
无机化学
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光电子学
·
晶体工程
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产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2021
·
IF 5.909
Xu Duan,Jian Yang,Guang Hu,Chen Yang,Yangfan Chen,Qingcai Liu,Shan Ren,Jiangling Li
In this work, based on a type of energy band engineering strategy as calcination , TiO 2 /ZSM-5 hybrids for photodegradation of methyl orange (MO) in water under UV light have been developed via a facile solid state diffusion method. Effects of varied calcination temperatures on TiO 2 /ZSM-5 hybrids have been systematically characterized including XRD , FT-IR, SEM, TEM , EDX mapping, BET, PL , EIS , UV–vis DRS, active species trapping experiments and Mott-Schottky curves. It was found that the calcination temperature influenced photocatalytic activity , typically on physicochemical properties of materials and adjustment for the energy gap and band position of TiO 2 . The XRD analysis revealed that hybridization of ZSM-5 kept the crystal phase of TiO 2 as anatase unchanged with the high-rising calcined temperature. The optimum sample calcined at 450 °C named as Z-T (450) presented nearly 99% degradation rate for MO, owing to optimal uniform distribution, highest specific surface area and best charge separation/transfer efficiency. The FT-IR comparison result that the functional groups and peak strength of the used catalyst were alike as before, showed the stability of photocatalyst . Adoption of calcination strategy does provide not only a clean, low-cost and highly efficient path to approach the complete degradation of azo dyes , but also a chance for photocatalytic technology to fulfill the implementation in industrial applications.
研究领域:
材料科学
·
环境化学
·
物理化学
·
催化化学
·
纳米材料
·
光催化技术
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Xing Zhang,Peng Deng,Mengyang Zheng,Yanling Hao,Xiu Gong,Fuzhong Gong,Jing-Chang Li
Anion redox reactions in layered cathode materials have attracted significant attention due to their remarkable potential to enhance the capacity and energy density of lithium-ion batteries. However, in conventional sulfide-based cathodes such as Li x TiS 2 , anionic redox is only partially reversible at high voltages and suffers from rapid capacity fading. These challenges primarily originate from the intrinsic electronic band structure of Li x TiS 2 , where the Ti 3+ /Ti 4+ redox couple lies far above the S 3 p band, suppressing ligand-to-metal charge transfer during Li + (de)intercalation. To overcome this limitation, we introduce a bandgap-engineering strategy via partial substitution of Ti 3+ with Cr 3+ , effectively narrowing the d- p bandgap and activating sustainable sulfur redox chemistry. The Cr-substituted compound, Li 0.80 Cr 0.67 Ti 0.33 S 2 , exhibits sustainable sulfur redox activity, thereby achieving a higher capacity of 223.0 mA h g −1 and nearly doubling the energy density of pristine Li 0.80 TiS 2 . Furthermore, Li 0.80 Cr 0.67 Ti 0.33 S 2 preserves its layered framework throughout the whole (de)lithiation process, indicating effective suppression of structural collapse during sulfur redox. Therefore, it demonstrates outstanding rate performance (77.5% capacity retention at 5.0C) and excellent long-term cycling stability (80% retention after 330 cycles), significantly outperforming its undoped counterpart. These findings highlight the critical role of ligand-metal d- p orbital overlap in enabling and stabilizing sustainable sulfur redox, providing valuable insights for the design of high-performance cathodes for next-generation lithium-ion batteries.
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产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）