ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Meiling Yang,Xiaofang Liu,Bin Zhang,Yao Chen,Hengyang Wang,Jian Yu,Guoyu Wang,Jingtao Xu,Xiaoyuan Zhou,Guang Han
Cu2S, consisting of Earth-abundant and eco-friendly elements, is a promising candidate for thermoelectric energy conversion. The stoichiometric Cu2S has intrinsically low thermal conductivity together with meagre electrical conductivity. Herein, in order to improve the electrical properties, we develop a facile solvothermal method for synthesizing a series of Cu2–xS with tunable phase compositions. With reduction in the CuCl/Na2S molar ratio in the solution precursors from 2:1 to 1.75:1, the solvothermal products transform from single-phase Cu2S into Cu2S–Cu1.96S composites, which are preserved in the hot-pressed pellets. The decreased CuCl/Na2S molar ratio results in increased room-temperature Hall carrier concentration, leading to enhanced electrical conductivity. Specifically, the pellet corresponding to the 1.75:1 CuCl/Na2S precursor ratio obtains a power factor of 8.04 μW cm–1 K–2 at 815 K, which is ∼735% of the value obtained by stoichiometric Cu2S. Along with the moderate thermal conductivity, this sample achieves an enhanced zT value of 0.87 at 815 K, representing a ∼250% increase when compared to stoichiometric Cu2S. This study demonstrates an effective strategy in enhancing the thermoelectric performance of solution-synthesized Cu2S-based materials by phase tuning.
研究领域:
材料科学
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能源材料
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纳米技术
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Xin Jin,Haili Lin,Xuemei Jia,Shuang Li,Xinyue Li,Qianlong Wang,Shifu Chen,Jing Cao
Red phosphorus (RP) has recently attracted considerable attention in the field of photocatalysis owing to its remarkable optical properties. However, the rapid recombination of photogenerated carriers presents a substantial challenge for the application of RP in the selective photocatalytic oxidation of benzyl alcohol. Herein, a series of nickel sulfide (NiS) materials with different crystal phase, including α-NiS, β-NiS and α-β-NiS, were employed to modulate the interfacial charge transfer in RP for photocatalytic oxidation of benzyl alcohol (BA) coupled with H 2 evolution. A comprehensive array of experimental and theoretical analyses has demonstrated that the Ohmic junction formed between β-NiS and RP is more conducive to enhancing the separation and migration of carriers in comparison to the Schottky junction formed between α-NiS and RP. As expected, the β-NiS/RP exhibited superior photocatalytic performance, achieving higher yields of benzaldehyde (6.79 μmol g −1 h −1 ) and H 2 (7.16 μmol g −1 h −1 ) compared to α-NiS/RP, α-β-NiS(glo)/RP and α-β-NiS(fla)/RP. The observed enhancement in photocatalytic activity can primarily be attributed to the distinct carrier separation mechanisms, specifically the Ohmic contact in the β-NiS/RP system and the Schottky junction in the α-NiS/RP system. This study introduces an effective strategy for optimizing carrier migration mechanisms in composite catalysts via crystal phase modulation, thereby providing valuable insights into the design of highly efficient photocatalysts for energy and environmental applications.
研究领域:
材料科学
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化学工程
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环境科学
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Hao Jiang,Yian Wang,Jue Hu,Xuxia Shai,Chengxu Zhang,Thiquynhxuan Le,Libo Zhang,Minhua Shao
Hydrogen peroxide (H 2 O 2 ), as one of the most important chemicals, is widely applied in many industries. Electrocatalytic oxygen reduction provides a safe and on-site method for H 2 O 2 synthesis. The research of transition metal oxides (TMOs) for H 2 O 2 synthesis is mainly focused on the modification of transition metal elements and graphene. Few studies directly control pure TMOs without changing supporting materials or introducing other elements. Here, we demonstrate for the first time a phase regulation strategy to develop highly selective and stable tungsten trioxide catalysts for H 2 O 2 generation through 2e − oxygen reduction reaction (2e − ORR). DFT calculations show that the kinetic energy barrier (0.08 eV) of the 2e − ORR pathway on the cubic tungsten trioxide (c-WO 3 ) surface is much lower than that of the 4e − ORR pathway (0.76 eV). As a result, a selectivity of 90 % and H 2 O 2 production rate of 179 mmol g cat −1 h −1 are achieved at 0.1 V vs RHE under alkaline conditions, outperforming all catalysts previously reported under the same conditions. Moreover, after continuous testing for more than 24 h at a constant potential of 0.1 V vs RHE, the H 2 O 2 generation rate has not been diminished, indicating an excellent stability of c-WO 3 in practical applications.
研究领域:
材料科学
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电化学
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催化科学
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产品关联
DOI
高影响因子
Journal of Materials Chemistry B
·
2020
·Vol. 8
·期 30
·6451-6458
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IF 5.344
Daomeng Liu,Daquan Wang,Xunan Jing,Xiaoping Zhao,Duo Xi,Dongfeng Dang,Lingjie Meng
Nanozymes are a new generation of artificial enzymes that address the limitations of natural enzymes, with numerous reports on the development of high performance nanozymes for various applications. Herein, the phase regulation of network-like MoSe2 from the metal 1T phase to semiconductor 2H phase was achieved under different reaction conditions by a facile but efficient microwave-assisted solvothermal method. The coexisting 1T/2H-MoSe2 with edge enriched and defective nanostructures showed great enhancement of the peroxidase-like properties. This high enzymatic activity may arise from optimized active sites of 1T/2H-MoSe2, effectively leading to a rapid charge transfer within the substrate. In addition, chitosan functionalization not only greatly improves the dispersion stability of MoSe2, but also significantly increases its peroxidase-like activity, probably due to its enhanced affinity to hydrogen peroxide (H2O2). Based on these results we have established a highly sensitive colorimetric assay for the detection of H2O2 and glucose in human serum.
研究领域:
材料科学
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生物催化
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医学检测
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2017
·Vol. 47
·期 6
·3248-3253
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IF 1.579
Chen Jun-Liang,Liu Chengyan,Miao Lei,Gao Jie,Zheng Yan-yan,Wang Xiaoyang,Lu Jiacai,Shu Mingzheng
With excellent high-temperature stability (up to 1000 K) and favorable electrical properties for thermoelectric application, TiNiSn-based half-Heusler (HH) alloys are expected to be promising thermoelectric materials for the recovery of waste heat in the temperature ranging from 700 K to 900 K. However, their thermal conductivity is always relatively high (5–10 W/mK), making it difficult to further enhance their thermoelectric figure-of-merit ( ZT ). In the past decade, introducing nano-scale secondary phases into the HH alloy matrix has been proven to be feasible for optimizing the thermoelectric performance of TiNiSn. In this study, a series of TiNiSn-based alloys have been successfully synthesized by a simple solid-state reaction. The content and composition of the heterogeneous phase (TiNi 2 Sn and Sn) is accurately regulated and, as a result, the thermal conductivity successfully reduced from 4.9 W m −1 K −1 to 3.0 Wm −1 K −1 (750 K) due to multi-scale phonon scattering. Consequently, a ZT value of 0.49 is achieved at 750 K in our TiNiSn-based thermoelectric materials. Furthermore, the thermal stability of TiNiSn alloys is enhanced through reducing the Sn substance phase.
研究领域:
材料科学
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能源工程
✓ 已验证
产品关联
DOI
高影响因子
Nano Energy
·
2022
·
IF 19.069
Sin-Yi Pang,Weng-Fu Io,Lok-Wing Wong,Jiong Zhao,Jianhua Hao
Crystal phase modulations in two-dimensional (2D) materials have garnered extensive interest because of their intriguing features and potential applications. Nonetheless, synthesizing some specific phases of metastable transition metal dichalcogenides (TMDs) remains a challenge due to the restricted selectivity under chemical and physical treatments, especially for direct growth of specific phase of TMDs on 2D substrates to form heterostructures . Taking the merits of MXene with tunable atomic vacancies and surface chemistry via surface functionalization , the phase of epitaxially grown TMDs on 2D MXene can be significantly affected. In this work, 1 T′-MoS 2 and 1 T-MoSe 2 were directly grown on electrochemically synthesized MXene under controlled oxidization conditions and selected MXene substrate. Owing to the synergistic effect of TMDs and MXene, the TMDs/MXene heterostructure catalysts exhibit good electrochemical activity under acidic conditions, with a low overpotential of 167 mV at a current density of 10 mA cm −2 . Our work not only demonstrates the distinct chemical characteristic of various MXenes feasible for surface engineering which promotes the direct and in situ growth of phase controlled TMDs on MXene substrates but also displays the high electrochemical activity in TMDs/MXene heterostructure catalysts.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2025
·
IF 11.3
Feng Xie,Guanghuan Li,Feng Yan,Chengbin Xiao,Pengju Wang,Xuehua Shen,Biao Yang,Han Lin,Huarong Luo,Zuotai Zhang
Solid–liquid biphasic absorbents are a promising solution for overcoming the high-energy consumption challenge faced by liquid amine-based CO2 capture technologies. However, their practical applications are often hindered by difficulties in separating viscous solid-phase products. This study introduces a novel nonaqueous absorbent system (PD/PZ/NMP) composed of 4-amino-1-methylpiperidine (PD), piperazine (PZ), and N-methyl-2-pyrrolidone (NMP), engineered to produce easily separable powdery products. The PD/PZ/NMP absorbent achieves a CO2 loading of 0.86 mol-CO2/mol-amine, with 91% of CO2 concentrated in the solid phase. It demonstrates excellent cyclic stability, maintaining a regeneration efficiency of 91% after five regeneration cycles, and reduces energy consumption by 52% compared with the conventional monoethanolamine absorbent. Remarkably, PZ plays a crucial role in regulating the crystal composition of solid-phase products, transforming them from a viscous state to a crystalline powder. Characterization and density functional theory analysis explain the crystal-phase regulation mechanism: PD absorbs CO2 to form zwitterions (PDH+COO–), affording viscous products, and PZ forms protonated amines (PZH+) and monocarbamates (PZCOO–), which interact with PDH+COO– via hydrogen bonding to form a crystalline powder. These findings demonstrate the CO2 capture efficacy of the PD/PZ/NMP absorbent and provide a robust theoretical framework for fabricating solid–liquid biphasic absorbents tailored for practical applications.
研究领域:
化学工程
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Jun Chen,Yanlong Fu,Fang Sun,Zhengguang Hu,Xing Wang,Ting Zhang,Fengshou Zhang,Xiaoling Wu,Haisheng Chen,Guoan Cheng,Ruiting Zheng
Defect engineering and phase engineering are two powerful strategies for regulating the intrinsically sluggish electronic and ionic kinetics of TiO 2 to enhance sodium storage. However, synergetic control of the defects and phases in TiO 2 nanomaterials remains a major challenge. Herein, we clarify the phase and defect synergetic evolution regularities of self-supported TiO 2-X nanotube arrays (TNTAs) with different annealing processes, which amazingly demonstrate different characteristics from traditional TiO 2 nanoparticles. The phase composition and oxygen vacancy (OV) concentration tuning strategies are combined to systematically clarify how these two important synergetic factors influence the sodium storage properties of TNTAs. In particular, unique porous-wall black amorphous TNTAs annealed at 300 ℃ in air and core-shell black anatase TNTAs annealed at 600 ℃ in N 2 show the best sodium storage performance among all amorphous and anatase samples, respectively. Cyclic voltammetry (CV) kinetics analysis demonstrates that both pseudocapacitive and diffusion-controlled charge storage mechanism exist in the TNTAs. The correlations of the pseudocapacitive capacity and the diffusion-controlled capacity with the OV concentrations and phases are clarified in detail. Both the pseudocapacitive capacity and diffusion-controlled capacity are enhanced in samples with high OV concentration in the amorphous and anatase TNTAs. Density functional theory (DFT) calculations further indicate that a high OV density corresponds to a low sodium insertion energy and high capacity, which matches the experimental results.
研究领域:
材料科学
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2025
·
IF 2.6
Qiuyu Fang,Jialiang Luo,Chenghong Zhang,Wei Wang,Wei Ding,Ganhong Zheng,Zhigao Sheng
The phase selectivity and morphology of materials is an effective strategy to improve the electromagnetic wave absorption (EMWA). However, the preparation of EMWA materials with both controllable phase component and adjustable morphology remains a great challenge. Herein, a strategy of phase regulation through high magnetic field is proposed to achieve controllable adjustment of the phase and morphology of iron sulfide, thus promoting interface polarization to improve the EMWA performance. When a high magnetic field is introduced into the reaction, the single Fe3S4 phase is gradually evolved into FeS2 due to the action of magnetizing energy, which presents in the form of Fe3S4/FeS2 composite. And with the increase of magnetic field intensity, FeS2 content increases gradually. In addition, the magnetic field also induces the assembly of Fe3S4/FeS2 and tends to be staggered. Due to the regulation of phase and morphology, accompanied by the redistribution of conductive loss and interfacial polarization, so that the EMWA property of iron sulfide is effectively regulated. 9 T sample with a good impedance matching exhibits a minimum reflection loss value of −50.31 dB, and the effective absorption bandwidth (EAB) is extended to 4.5 GHz. This work has important guidance and inspiration for the design of phase and morphology controlled by the high magnetic field, and it has great application potential in regulating EMWA performance.
研究领域:
材料科学
·
电磁学
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产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 27
·13030-13036
·
IF 3.925
Yu-Hang Zhao,Tao Zhang,Xiao-Feng Wang,Shao-Jie Li,Yu Pan,Yihan Wang,Xue-Zhi Song,Zhenquan Tan
The rational exploration of highly active and low-cost materials for electrocatalytic hydrogen evolution is extremely imperative, but remains challenging as well. Transition metal carbides (TMCs) as highlighted electrocatalysts usually exhibit unsatisfactory activity and stability. In this work, we demonstrate a two-step strategy for electrocatalyst synthesis involving biomass-derived tannic acid (TA) and coordination assembly preparation followed by subsequent high-temperature carbonization. Interestingly, by simply controlling the feed amount of TA, heterostructured nitrogen-doped graphene-coated Mo3Co3C-based tri- and bi-component electrocatalysts (Mo3Co3C/Mo2C/Co@NC and Mo3Co3C/Co@NC) can be obtained with phase regulation and interface engineering. It is observed that the heterostructured materials possess more active sites than that of the TMC-excluding sample (Co@NC). Moreover, the tri-component Mo3Co3C/Mo2C/Co@NC may enhance the intrinsic activity at each active site due to the strong interaction at the Mo3Co3C/Mo2C interface. These advantages allow the Mo3Co3C/Mo2C/Co@NC catalyst to deliver superior electrocatalytic activity and favorable kinetics towards the HER, with a low overpotential of 211 mV and a Tafel slope of 96.0 mV dec−1. Furthermore, it has good long-term stability. This work provides new inspiration for heterostructured TMC-based electrocatalysts with high performance towards promising catalytic applications.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Science
·
2023
·Vol. 10
·期 26
·2302917
·
IF 15.1
Haipeng Di,Wen Zeng,Bo-Han Li,Feiyi Liao,Chen Zhao,Chuanhui Liang,Huang Li,Jia-Cheng Wang,Da-Bing Cheng,Zefeng Ren,Yiying Zhao
The charge transport in quasi-2D perovskites limits their applications despite the superior stability and optoelectronic properties. Herein, a novel strategy is proposed to enhance the charge transport by regulating 3D perovskite phase in quasi-2D perovskite films. The carbohydrazide (CBH) as an additive is introduced into (PEA) 2 MA 3 Pb 4 I 13 precursors, which slows down the crystallization process and improves the phase ratio and crystal quality of the 3D phase. This structure change results in a significant improvement in charge transport and extraction, leading to the device demonstrating an almost 100% internal quantum efficiency, a peak responsivity of 0.41 A W −1 , and a detectivity of 1.31 × 10 12 Jones at 570 nm under 0 V bias. Furthermore, the air and moisture stability of (PEA) 2 MA 3 Pb 4 I 13 films is not deteriorated but gets significantly improved due to the better crystal quality and the passivation of defects by the residual CBH molecule. This work demonstrates a strategy for improving the charge transport properties of quasi-2D perovskites and also sheds light on solving the stability issue of 3D perovskite films via the proper passivation or additives, which will inspire the fast development of the perovskite community.
研究领域:
材料科学
·
光电技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2024
·
IF 20.2
Weichen Wang,Hongke Zhang,Fangyuan Zhou,Yidan Wang,Zhiyu Xiang,Wanbin Zhu,Hongliang Wang
Developing cost-effective and highly active catalysts for the selective hydrogenation of furfural to target products is significant yet remains a substantial conundrum in the chemical industry. Herein, we present a phytic acid-assisting pyrolysis strategy to phase-controlled synthesis of a series of nickel phosphides catalysts (Ni 3 P/mSiO 2 , Ni 12 P 5 /mSiO 2 and Ni 2 P/mSiO 2 ), which exhibited phase-dependent catalytic performance in furfural hydrogenation. Ni 12 P 5 /mSiO 2 achieved the highest yield (97.3 %) of cyclopentanone under 1 MPa H 2 at 150 °C, and Ni 3 P/mSiO 2 could further hydrogenate cyclopentanone to a 60.8 % yield of cyclopentanol when the H 2 pressure increased to 2 MPa. Meanwhile, Ni 2 P/mSiO 2 demonstrated temperature-controlled selectivity for switching between furfuryl alcohol and cyclopentanone. Detailed characterizations and density functional theory calculations elucidated that the differences in catalytic performance were primarily attributed to the hydrogenation ability and acidity of catalysts as well as furfural adsorption configuration, which were determined by the tunable crystal phases of nickel phosphides. This work paves the promising avenue for the rational design of metal phosphide catalysts and harnessing their considerable potential for biomass conversion.
研究领域:
化学工程
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）