JOURNAL OF ALLOYS AND COMPOUNDS
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2024
·
IF 5.8
Yang-Wei Wang,Yu Wang,Hao Liang,Yi-Xin Zhang,Jing Feng,Zhen-Hua Ge
Bismuth telluride-based materials has been applied in thermoelectric cooling wildly, but the properties still can be further enhanced by doping, microstructure controlling and compositing strategies. Herein, we demonstrate an anomalous doping strategy in (Bi, Sb) 2 Te 3 (BST) materials, where the strong n type dopant of PbBr 2 acts as p-type dopant, introducing holes in BST materials. The anomalous doping is attributed to the dissolution of Pb and Br elements into the matrix in a non-stoichiometric ratio, with Pb predominantly occupying Sb vacancies and Br enriching the in-situ generated Sb 2 O 3 , resulting in the increased hole concentration and improved electrical conductivity. The maximum power factor (PF) ultimately increases to 3972 μW m −1 K −2 for the 0.3 mol% PbBr 2 doped BST sample. Moreover, the enhanced multi-scale wavelength phonon scattering centers cause the lattice thermal conductivity fall to 0.52 W m −1 K −1 . Finally, the peak ZT is effectively enhanced to 1.3 at 323 K, which is 22 % higher than that of pristine sample. Furthermore, a direct conversion efficiency of 4.6 % is achieved in a single 0.3 mol% PbBr 2 -doped BST leg at a temperature gradient of ΔT = 200 K. Thus, this study underscores the anomalous PbBr 2 doping in Bi 0.42 Sb 1.58 Te 3 , promoting the wider application of BST-based materials.
研究领域:
材料科学
·
凝聚态物理
·
功能材料
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热电转换
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半导体掺杂
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DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2019
·Vol. 27
·期 12
·3053-3059
·
IF 1.911
Nianjun Kang,Dongbo Xu,Weidong Shi
In recent years, the excessive use of antibiotics has become a serious problem for human health. BiVO 4 regarded as one of the most promising visible-light-driven photocatalysts was used to degrade the antibiotics. In this paper, we fabricated Bi/BiVO 4 plasmonic photocatalysts which enhanced the photocatalytic activity of BiVO 4 for degradation of tetracycline (TC) antibiotic. The Bi/BiVO 4 photocatalysts were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, transmission electron microscopy and high-resolution transmission electron microscopy . In addition, the photocatalytic experiment results show that the 0.04-Bi/BiVO 4 sample has the best photocatalytic activity for 2 times than the pure BiVO 4 photocatalyst. The cycle experiments, after four repetitions of the experiments, showed the sample still maintained a high photocatalytic activity. Finally, the photocatalytic reaction mechanism was also studied by free radical capture experiments and electron paramagnetic resonance spectroscopy .
研究领域:
环境化学
·
材料科学
·
光催化
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纳米材料
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环境污染治理
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药物降解
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Qijie Mo,Nana Chen,Mengdie Deng,Lichun Yang,Qingsheng Gao
To advance hydrogen economy, noble-metal-free electrocatalysts with good efficiency are urgently demanded. They can be developed from metal–organic frameworks (MOFs) with abundant structure-variety, in which a controlled pyrolysis is desired to rationalize nanostructure and maximize catalytic activity. Herein, the efficient regulation is proposed for the first time on the carbon-shell of MOFs-derived Co@NC nanocomposites via varying temperature and flow-rate during pyrolysis, enabling the good accessibility and the electronic optimization of active Co cores. With moderated temperature and flow-rate, the resulting ultrathin carbon-shell, on the one hand, renders Co cores easily accessible to electrolytes and, on the other hand, promotes the electronic penetration to optimize metallic Co active sites. As expected, the optimal Co@NC affords the benchmarking performance of noble-metal-free electrocatalysts in hydrogen evolution and oxygen reduction reactions, featured by the low overpotentials, the striking kinetic metrics, and the outstanding long-term stability. Elucidating the feasibility to design efficient electrocatalysts via controlled MOFs pyrolysis, this work will open up new opportunities for the development of cost-effective materials in the energy field.
研究领域:
材料科学
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电催化
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能量存储与转换
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纳米技术
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可持续能源
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DOI
高影响因子
DYES AND PIGMENTS
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2017
·
IF 3.473
Xiao-Lei Zhao,Hui-Fen Qian,Wei Huang
A family of bi-heterocyclic dyes have been first synthesized by using heterocyclic pyridone and benzothiazole components. UV−Vis spectral analyses reveal distinct spectral behaviors depending on the introduced electron-withdrawing and electron-donating groups in the benzothiazol ring as well as the polarity of solvents. Namely, nitrobenzothiazol based bi-heterocyclic dyes display more obvious solvatochromism compared with both methylbenzothiazol based ones and previously reported azobenzene based half-heterocyclic pyridone dyes. More interestingly, 1 H NMR and UV−Vis spectral results as well as single-crystal structures manifest that these dyes are in the hydrazone form in the solid state and in the non-polar solvents. However, they adopt dominating azo form in polar solvents and it can be transformed to the hydrazone form in the acidic condition, which are both different from all known half-heterocyclic pyridone dyes. In addition, transformation from hydrazone to deprotonated azo form can be achieved via metal-ion complexation, and four Ni II and Cu II complexes with different pyridone N -tails have been structurally characterized. It is noted that the ligands adopt different tridentate coordination fashions with Ni II and Cu II ions and a rare tetranuclear Cu II complex with equal Cu⋯Cu separation is obtained.
研究领域:
有机化学
·
配位化学
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Zhicong Chen,Peishan Shao,Puxian Xiong,Yao Xiao,Bingjun Liu,Zhiduo Wang,Sheng Wu,Dongliang Jiang,Kang Chen,Jiulin Gan,Dongdan Chen,Zhongmin Yang
Mechanoluminescence (ML) is the nonthermal luminescence generated in the process of force-to-light conversion, which has broad prospects in stress sensing, wearable devices, biomechanics, and multiple information anticounterfeiting. Multivalence emitter ions utilize their own self-reduction process to realize multiband ML without introducing another dopant, such as Eu3+/Eu2+, Sm3+/Sm2+, and Mn4+/Mn2+. However, self-reduction-induced ML in bismuth-activated materials has rarely been reported so far. In this work, a novel visible-to-near-infrared (vis–NIR) ML induced by the self-reduction of Bi3+ to Bi2+ in the spinel-type compound (MgGa2O4) is reported. The photoluminescence (PL) spectra, PL excitation (PLE) spectra, and PL lifetime curves demonstrate that Bi3+/Bi2+ ions are the main luminescence centers. Notably, the possible self-reduction model is proposed, where a magnesium vacancy (VMg″) is considered as the driving force for the self-reduction of Bi3+ to Bi2+. Furthermore, an oxygen vacancy (VO••) is confirmed by electron paramagnetic resonance (EPR) spectroscopy. Combined with thermoluminescence (TL) glow curves and ML spectra, a plausible trap-controlled ML mechanism is illustrated, where electron–hole (VO••/VMg″) pairs play a significant role in capturing electrons and holes. It is worth noting that the proof-of-concept dual-mode electronic signature application is implemented based on the flexible ML film, which improves the capabilities of signature anticounterfeiting for high-level security applications. Besides, multistimulus-responsive luminescence behaviors of the ML film are realized under the excitation of a 254 nm UV lamp, thermal disturbance, 980 nm laser, and mechanical stimuli. In general, this study provides new insights into designing vis–NIR ML materials toward wider application possibilities.
研究领域:
材料科学
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光学
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DOI
高影响因子
Advanced Science
·
2024
·Vol. 11
·期 28
·2401730
·
IF 14.3
Qian Yao,Cheng Zheng,Kejun Liu,Mingyue Wang,Jinmei Song,Lifeng Cui,Di Huang,Nana Wang,Shi Xue Dou,Zhongchao Bai,Jian Yang
Sodium ion batteries (SIBs) are considered as the ideal candidates for the next generation of electrochemical energy storage devices. The major challenges of anode lie in poor cycling stability and the sluggish kinetics attributed to the inherent large Na + size. In this work, Bi nanosphere encapsulated in N-doped carbon nanowires (Bi@N-C) is assembled by facile electrospinning and carbonization. N-doped carbon mitigates the structure stress/strain during alloying/dealloying, optimizes the ionic/electronic diffusion, and provides fast electron transfer and structural stability. Due to the excellent structure, Bi@N-C shows excellent Na storage performance in SIBs in terms of good cycling stability and rate capacity in half cells and full cells. The fundamental mechanism of the outstanding electrochemical performance of Bi@N-C has been demonstrated through synchrotron in-situ XRD, atomic force microscopy, ex-situ scanning electron microscopy (SEM) and density functional theory (DFT) calculation. Importantly, a deeper understanding of the underlying reasons of the performance improvement is elucidated, which is vital for providing the theoretical basis for application of SIBs.
研究领域:
材料科学
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电化学
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DOI
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
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2020
·
IF 3.333
Liwei Sun,Jingyi Luo,Ming Gao,Shaokun Tang
Developing solid materials with high CO 2 adsorption capacity and catalytic activity has been a hotspot due to the greenhouse effect. In this work, bi-functionalized ionic liquid 1-vinyl-3-methoxyethyl imidazolium glycinate ([VMOEim][Gly]) was copolymerized with crosslinker divinylbenzene (DVB) to obtain bi-functionalized ionic liquid porous copolymers P( n DVB-[VMOEim][Gly]) and HP( n DVB-[VMOEim][Gly]). These copolymers possess loose stack of small particles or laminates, and they contain mesopores and a small number of micropores. For HP(0.6DVB-[VMOEim][Gly]), surface area reaches up to 508 m 2 ·g −1 and the initial decomposition temperature is about 180 °C. Then these porous copolymers were applied for CO 2 adsorption at 25 °C and cycloaddition reaction of CO 2 with epichlorohydrin under ambient pressure and cocatalyst-free condition. The maximum CO 2 capture capacity is 64.5 mg/g with HP(0.6DVB-[VMOEim][Gly]) as adsorbent. The effects of catalyst type, catalyst dosage, reaction time and temperature on the yield of cyclic carbonate were also investigated. The optimum conditions are 4 wt% of HP(0.6DVB-[VMOEim][Gly]) (based on the epichlorohydrin) as catalyst at 130 °C for 10 h, and the yield of 4-(chloromethyl)-1,3-dioxolan-2-one can reach 94%. Furthermore, the catalytic activity of HP(0.6DVB-[VMOEim][Gly]) maintains and the yield is 91% after five-cycle experiment. The mechanism of cycloaddition reaction was also discussed.
研究领域:
材料科学
·
环境科学
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DOI
高影响因子
ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
Qin Wang,Yejian Xue,Shanshan Sun,Shihua Li,He Miao,Zhaoping Liu
In this work, the La 0.8 Sr 0.2 Co 1-x Mn x O 3 (x = 0, 0.2, 0.4, 0.6, 0.8, 1) perovskites (LSCM) were synthesized by a facile improved sol–gel method. The crystalline structures, morphologies, Co/Mn valence states and oxygen adsorption/desorption behavior of the LSCM materials are systematically studied, and their catalytic activities toward ORR and OER are investigated by the rotating-disk electrode (RDE) and zinc-air battery techniques. It is found that the proper substitution of Co with Mn can efficiently improve the ORR and OER activities of La 0.8 Sr 0.2 CoO 3 perovskite at the same time. The LSCM-60 catalyst exhibits the optimum bi-functional activity. It is mainly attributed to the regulation of the Bi-site Co/Mn valence states and the improvement of the oxygen adsorption/desorption capability. Besides of the good bi-functional property, LSCM-60 shows superior durability compared with Pt/C and IrO 2 catalysts. When using LSCM-60 as the cathode catalyst of zinc-air batteries, the low charge-discharge overpotential (1.05 V at 50 mA cm −2 ) and the excellent long-term cycle stability were obtained. This study exhibits the possibility to improve the bi-functional activity of La 0.8 Sr 0.2 CoO 3 through a simple doping process.
研究领域:
材料科学
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电化学
·
能源存储与转换
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DOI
高影响因子
MATERIALS SCIENCE AND TECHNOLOGY
·
2016
·
IF 1.008
D. Tan,Y. Liu,W. Guo,J. Wang,Z. Chang,D. Li
In the present work, W–Bi–S-tridoped TiO2 nanoparticles were synthesised by a simple sol–gel method. The structure and morphology of as-prepared W–Bi–S-tridoped TiO2 were characterised by using X-ray powder diffraction, transmission electron microscopy, scanning electron microscopy and UV–Vis diffuse reflectance spectrum. It was found that the W–Bi–S-tridoped TiO2 nanoparticles were well crystallised with a small size distribution. The absorption edge of TiO2 was extended into visible-light region obviously after being doped with W, Bi and S. The photocatalytic degradation of methylene blue was used as a probe reaction to evaluate the efficiency of W, Bi and S doping. The W–Bi–S-tridoped TiO2 exhibited the best photocatalytic activity, compared with TiO2, S-TiO2, W–S–TiO2 and Bi–S–TiO2. The mechanism that enhanced photocatalytic activity might be attributed to the synergistic effect of W, Bi and S.
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DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2026
·
IF 7.6
Pengxiang Zhang,Yumeng Wu,Shuling Liu,Xiaofeng Zhang,Xianji Guo,Xianli Wu,Yanyan Liu,Baojun Li
Rational design of heteronuclear dual‑atom catalysts with strong electronic coupling and spatial complementarity for highly selective 4e– oxygen reduction reaction (ORR) remains a significant challenge in electrocatalysis. Herein, a catalyst, Fe–Bi diatomic structures anchored in a cellulose-derived activated carbon matrix (FeBiDA@CC), was obtained for ORR, in which the Fe and Bi atoms exerted a synergistic effect through strong electronic coupling. Bi modulates Fe's spin and electronic structure, while Fe promotes Bi electron polarization and activation of outer shell electrons. The Fe–Bi spatial distance in the dual metal sites geometrically matches O2 bond length, optimizing modes of adsorption and activation to facilitate the preferred 4e– ORR pathway and improve catalytic stability. FeBiDA@CC exhibits a half-wave potential of 0.93 V, an electron transfer number of 3.92–4.00, and a current loss of only 7.2% after 100 h for ORR. Liquid and flexible zinc-air batteries based on FeBiDA@CC as a cathode catalyst demonstrate outstanding peak power densities of 200.5 and 96.6 mW cm–2, respectively, alongside excellent long-term cycling stabilities of 10,800 and 438 cycles, respectively. This work offers a novel perspective for electronic structural regulation and design of p-block element-based catalysts, opening new possibilities for the design of catalysts in the energy storage field.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2026
·Vol. 37
·期 14
·1094
·
IF 3.2
Jiang Shukang,Zheng Guangwei,Zhang Fengqing,Yu Hongwen,Cai Yongfeng,Zhang Yanli
The surface plasmon resonance (SPR) effect demonstrated by noble metal nanoparticles has been shown to significantly boost the photocatalytic activity of semiconductors under visible light. However, the high cost limits their practical use. Recent studies have found that bismuth (Bi), a non-noble metal, exhibits similar SPR properties. In this work, we developed a new synthesis method for Bi/Bi 2 WO 6 photocatalysts using a secondary solvothermal process. The metallic Bi was reduced in situ with tartaric acid as the reducing agent, while hexadecyltrimethyl ammonium bromide (CTAB) served as a surfactant to control the morphology. The Bi/Bi 2 WO 6 heterojunction prepared with an optimal CTAB amount (0.02 g) showed much better light absorption, achieving 100% degradation of Rhodamine B (RhB) within 15 min under visible light, representing a 57% improvement over pure Bi 2 WO 6 . Recycling tests confirmed the exceptional photochemical stability and recyclability. The high performance in RhB degradation can be linked to the SPR effect of metallic Bi, which improves light absorption, produces active sites and reactive species, and speeds up carrier transfer. Additionally, the formation of the Bi/Bi 2 WO 6 Schottky heterojunction promotes carrier separation and prevents recombination of photogenerated electron–hole pairs. This study also offers a clear mechanism for the photodegradation process of the synthesized photocatalyst. Overall, this work presents a new and affordable strategy for developing high-performance photocatalytic systems, with great potential for practical applications in environmental cleanup and pollutant removal.
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高影响因子
ELECTROCHIMICA ACTA
·
2026
·
IF 5.8
Jiayi Chen,Wei Han,Yixuan Cai,Xudong Wang,Rugeng Liu,Meng Zhang,Mei Li,Weiqun Shi
Studied the electrochemical behavior of Ce(III) ions on Bi film electrodes and liquid Bi electrode. • Studied the effect of Ce (III) ions on the electrochemical behavior of UO 2 2+ at Bi film electrode and liquid Bi electrode. • Ce(III) ions and UO 2 2+ ions were separated via potentiostatic and galvanostatic electro-deposition on a liquid Bi electrode. • Found that better separation of Ce(III) ions and UO 2 2+ can be achieved at relatively low potentials. • The extraction efficiency and separation efficiency were calculated for electrolytic separation at lower potentials. To achieve the separation of uranium and fission products, a liquid Bi electrode was employed to study the electrochemical separation of the fission product Ce(III) ions and UO 2 2+ ions. The electrochemical reduction mechanism of Ce(III) ions was investigated at a Bi film electrode using three electrochemical testing methods: CV, SWV and CP, The results showed that a series of reduction peaks related to the formation of Ce-Bi intermetallic compounds appeared at potentials more positive than the reduction potential of Ce(III) ions. Meanwhile, the electro-reduction mechanism of Ce(III) ions at a liquid Bi electrode was also explored. A reduction peak associated with the formation of Bi-Ce solid solution was recorded. The impacts of Ce(III) ions on the electro-reduction mechanism of UO 2 2+ at a Bi film electrode were examined, and found that the electro-reduction of UO 2 2+ was two-step single-electron transfer process before and after the addition of Ce(III) ions. Furthermore, electrochemical separation of UO 2 2+ and Ce(III) ions was performed at a liquid Bi electrode at -0.7 V/-1.3 mA cm -2 . XRD results confirmed that the separation product included not only UO 2 , but also Ce 2 O 3 and Bi-Ce alloy. Nevertheless, constant potential electrolysis experiment was conducted at the potential of -0.3 V, and the product analyzed by XRD, SEM and EDS demonstrated that only spherical UO 2 with a regular morphology was obtained. The separation factor between UO 2 2+ and Ce(III) ions and extraction efficiency of UO 2 were calculated to be 34.4 and 97.76 %, respectively. Download: Download high-res image (184KB) Download: Download full-size image
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