Sustainable Energy & Fuels
·
2025
·
IF 4.1
Yongheng Xiong,Yang Yu,Huangang Shi,Jifa Qu,Wenyi Tan
Single atom Fe sites, doped in CN materials, exhibit outstanding electrochemical activity for CO2-to-CO conversion. The pyrolysis of ZIF8 is a controllable method for fabricating isolated single atom metal sites. In this study, we propose a new strategy to increase the ratio of Fe in ZIF8 precursors by synergistically replacing Zn2+ with Bi3+ and Fe3+. After precursor pyrolysis, the obtained Bi/Fe–N–C catalysts, consisting of Bi sites and pyrrole-type Fe–Nx sites, serve as efficient electrocatalysts for the CO2RR. The results show that the optimized catalyst loaded with 94.8 mg per kgCat Fe exhibits a high FECO of >90.1% over a wide potential range of −0.4 to −0.7 VRHE (98.2% at −0.5 VRHE). Insights into the electrochemical reaction mechanism show that this successful design of Bi/Fe–N–C catalysts can provide a stable catalytic site to form *COOH, thus achieving energy-efficient electrochemical CO2 reduction to CO.
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产品关联
DOI
高影响因子
IONICS
·
2025
·
IF 2.6
He Shuangyi,Wang Zihao,Zhang Shuai,Zhao Weiwei,Luo Jujie
In this study, Ag – Bi bimetallic negative electrode was prepared on Fe foam substrate through a clean and efficient one-step microwave route. The synergistic effect of Ag, Bi, and Fe endowed the electrode with a remarkable electrochemical performance. The electrode attained an impressive areal capacitance of 5.24 F cm −2 at 1 mA cm −2 in 6 M KOH. Notably, the capacitance dropped to 76% of its original capacitance after undergoing 10,000 charge-discharge cycles at 10 mA cm −2 , which indicates good stability and reliability. Furthermore, an asymmetric supercapacitor was designed and built using Ag–Bi/iron foam as the positive electrode. The device maintained an 85.3% initial capacitance through 12,000 charge-discharge cycles, while delivering good areal energy/power density (643.56 µWh cm −2 /1266.63 µW cm −2 ). This study established a fabrication strategy for high-performance anode materials, achieved an excellent balance between electrochemical efficiency and economic viability, and demonstrated substantial potential for practical application.
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2018
·
IF 3.927
Hui Xu,Yunfang Huang,Dan Luo,Xiaomin Yang,Shao Jin,Qiyao Guo,Yuezhu Zhao,Yu Fang,Yuelin Wei,Jihuai Wu
In this work, multiple heterojunction Ag/Bi/BiOCl 0.8 Br 0.2 photocatalysts with novel porous micro-flower structure were fabricated via a facile one-step solvothermal route and characterized systematically. The TEM and HRTEM images clearly showed the heterogeneous nanostructures at the interface between Ag/Bi and BiOCl 0.8 Br 0.2 . The as-prepared Ag/Bi/BiOCl 0.8 Br 0.2 composites displayed a strong optical absorption in the region of 250–1500 nm, especially in the unexploited near infrared region which accounts for most of the sunlight. The multiple heterojunction photocatalyst exhibited an outstanding photocatalytic activity for the degradation of Rhodamine B under the UV, visible and NIR light irradiation, respectively. The highly enhanced photocatalytic activity was attributed to the synergistic effects, including the reduced band gap, the surface plasmon resonance effect, efficient charge separation of photo-generated electron-holes. On the basis of the radical species trapping experiments, the holes and superoxide radicals were confirmed to be the mainly active species involved in the degradation of Rhodamine B under the NIR light irradiation. This study provides a novel strategy for designing highly performance plasmonic photocatalysts under the whole solar light irradiation.
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DOI
高影响因子
Inorganic Chemistry Frontiers
·
2022
·Vol. 9
·期 21
·5562-5571
·
IF 7.779
Fudong Zhang,Xia Qi,Mingkai He,Fengshan Zheng,Lei Jin,Zhanhui Peng,Xiaolian Chao,Zupei Yang,Di Wu
Previous studies have revealed that both Bi doping and Bi2Te3 alloying are successful strategies to optimize the thermoelectric performance of SnTe; however, detailed and thorough investigations on exactly how they differ in modulating the band structure and microstructure were seldom given. Through a systematic comparison between Bi-doped and Bi2Te3-alloyed SnTe, we find in this work that despite the fact that they both contribute to the valence band convergence of SnTe, Bi2Te3 alloying induces little effect on the hole concentration unlike the typical n-type feature of Bi-doping; moreover, Bi2Te3 alloying tends to produce dense dislocation arrays at micron-scale grain boundaries which differs significantly from the substitutional point defect character upon Bi-doping. It was then found that Bi2Te3 alloying exhibits a relatively higher quality factor (B ∼ μw/κlat) at higher temperatures than Bi-doping. Subsequent Ge-doping in Bi2Te3-alloyed samples results in further valence band convergence and hole concentration optimization and eventually results in a maximum figure of merit ZT of 1.4 at 873 K in the composition of (Sn0.88Ge0.12Te)0.97-(BiTe1.5)0.03.
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DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2019
·Vol. 103
·期 1
·183-192
·
IF 3.094
Xueyun Liu,Cuimei Cheng,Xiaoman Li,Qing Jiao,Shixun Dai
The design of functional materials with tunable broadband luminescence performance is still of great interest in the fields of lighting, solar cells, tunable lasers, and optical amplifiers. Here, via a melt-quenching method, a series of bismuth (Bi)-doped germanium-borate glasses with composition of 40GeO 2 –25B 2 O 3 –25Gd 2 O 3 –10La 2 O 3 – x Bi 2 O 3 have been prepared, in which multiple Bi active centers can be stabilized simultaneously. Dual-modulating modes of visible (380-750 nm) and near-infrared (NIR) (1000-1600 nm) broadband photoemissions were effectively controlled under flexible excitation scheme. Photoluminescence (PL) spectra at low temperature 10-298 K were appropriately employed to interpret such an unusual wide visible emission band. To further illustrate the origin of NIR component, transmission electron microscopy (TEM) measurement was carried out. It is demonstrated experimentally that the visible emission mainly originates from the collective contribution of the 3 P 1 / 3 P 0 1 S 0 transitions of Bi 3+ , while the broadband NIR luminescence should be related to the formation of low valent Bi + and (or) Bi 0 centers. This work may help to enhance the knowledge of the complex luminescence mechanism for the Bi species and it also enables such transparent glass materials to be a promising candidate for the multifunctional tunable light source.
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DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2020
·
IF 4.939
Chen Chen,Xu Guan,Hongbo Wang,Shijie Dong,Ping Luo
In this paper, a novel Al–Bi(OH) 3 system hydrogen-generating material is investigated. Hydrolysis experiments show that the hydrolysis properties of the Al–10 wt% Bi(OH) 3 composite are significantly improved by doping with sodium chloride, and the Al–10 wt% Bi(OH) 3 –5 wt% NaCl composite has a low activation energy (10.4 kJ mol −1 ). With the further optimization of milling time, the hydrogen yield of Al–10 wt% Bi(OH) 3 –5 wt% NaCl composite reaches 1000 mL g −1 in 1 min. X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, energy-dispersive spectroscopy and thermogravimetric analysis are applied to characterize the composite and explore the hydrolysis mechanism. The characterization results show that the activation of aluminum mainly comes from three factors: (1) The formation of alumina during ball milling plays an important role in preventing the agglomeration between Al–Bi, Al–Al and Bi–Bi; (2) Bismuth generated during ball milling can form micro-galvanic cell with aluminum to promote the corrosion of aluminum; (3) Sodium chloride as a grinding aid contributes to crush aluminum powder , and chloride ions facilitate the corrosion of aluminum in the hydrolysis process . In addition, the drying method and initial water temperature have a great influence on by-products. The composite is expected to be used in mobile emergency fuel cell due to its rapid hydrogen production capacity.
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DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Qian Li,Yaping Wang,Xiao Xiao,Rui Zhong,Jiali Liao,Junling Guo,Xuepin Liao,Bi Shi
Natural leather (NL) based composite protection materials with lightweight, flexibility, wearability and high shielding efficiency will remarkably innovate the current research on X-ray protection materials. A co-doped Bi/Ce-NL composite with outstanding X-ray attenuation in the energy range of 20−120 keV is successfully fabricated. The uniform distribution of Bi 2 O 3 and CeO 2 nanoparticles in the hierarchical structure of natural leather significantly promotes the X-ray attenuation by improving the weak absorption region of Bi with Ce via synergistic effects of the two elements. The fabricated Bi/Ce-NL loading with 0.755 mmol cm −3 Bi 2 O 3 and 1.51 mmol cm −3 CeO 2 achieves approximately 100% X-ray shielding when the energy below 40 keV. Thus, the fabricated Bi/Ce-NL with superb X-ray attenuation can safely and comfortably protect human from the risk of X-ray exposure with low bulk density, high water vapor permeability, exceptional mechanical properties and excellent bending resistance, presenting significant advantages in wearability and flexibility compared to both traditional lead-based and polymer-based protection materials.
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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.
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DOI
高影响因子
MACROMOLECULAR CHEMISTRY AND PHYSICS
·
2021
·Vol. 223
·期 8
·2100338
·
IF 2.527
Chao Qu,Hongzhang Zhang,Changsheng Wang,Xianfeng Li
A membrane with low vanadium ion permeability and excellent electrochemical stability is crucial for a vanadium flow battery (VFB). Herein, a highly stable anion exchange membrane based on a bi-guanidinium crosslinking quaternized poly(arylene ether sulfone) (PSF) is reported. The positively charged guanidinium groups can not only form continuous and smooth ion transport channels but also prevent the mutual penetration of vanadium electrolyte at positive and negative sides, respectively, based on the Donnan exclusion effect. Moreover, the crosslinking structure endows the membrane high mechanical strength to meet the requirements of the harsh environment of VFBs. As a result, the anion exchange membrane fabricated by the poly(arylene ether sulfone) crosslinked with bi-guanidinium (BG-PSF) shows an impressive VFB performance with a coulombic efficiency of 99.8% and an energy efficiency of above 85.8% at a current density of 80 mA cm −2 , which is much higher than that of Nafion115. Furthermore, this battery can continuously work for over 200 cycles at a current density of 80 mA cm −2 , indicating good stability of the membrane. Therefore, the rationally designed BG-PSFs are promising for VFB applications.
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DOI
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2020
·
IF 7.094
Taoqing Huang,Yongwei Li,Min Chen,Limin Wu
Hexagonal boron nitride (h-BN), as a high thermal conductive filler , has been widely used to construct thermal transport network in polymers. However, anisotropic thermal property of BN and its conventional thermal conductive network usually lead to high thermal conductivity in one direction that limits the overall heat dissipation effect. Herein, we report a novel radially aligned three-dimensional boron nitride nanosheets/epoxy composite for thermal interface materials via radial freeze-casting method. The as-prepared composite with radially aligned boron nitride nanosheets lamellae exhibits bidirectional high thermal conductivity , with 4.02 W m −1 K −1 in the through-plane direction and 3.87 W m −1 K −1 in the in-plane direction even at low BNNS loading (e.g., 15 vol%), respectively. Besides, excellent electronic insulation property and shape stability can also meet the requirements of isotropic TIM in thermal management.
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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.
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DOI
高影响因子
Journal of Energy Chemistry
·
2019
·
IF 5.162
Jun Chen,F. Xu,L. Sun,Kexiang Zhang,Yongpeng Xia,Xiaolei Guo,Huanzhi Zhang,Fang Yu,Erhu Yan,Hongliang Peng,Pengru Huang,Shujun Qiu,Cuili Xiang,Yujie Sun
In this work, Ni-Bi-B alloy has been synthesized via chemical synthesis method . A new kind of Al-InCl 3 -(Ni-Bi-B) composite has been prepared by high energy mechanical ball grinding Al powder with additives. Results show that the doped Ni-Bi-B alloy can significantly improve the hydrogen generation performance of Al-InCl 3 and the catalytic activity is enhanced with the increasing content of Bi in Ni-Bi-B alloy. Under optimal conditions, the hydrogen generation yield and conversion yield of Al-InCl 3 -(Ni-Bi-B) reached 1196.8 mL g −1 and 100.0% at room temperature, respectively. Mechanism study shows five kinds of active sites, such as the fresh surface/defect of Al particle , Al-AlCl 3 , Al-In, Al-Bi/B and Al-Ni/B produced during the ball milling process. Their synergistic effect enhances the hydrogen generation performance of Al-InCl 3 -(Ni-Bi-B) remarkably. In general, the proposed Al-InCl 3 -(Ni-Bi-B) composite is possible to serve as hydrogen generation material for fuel cells.
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DOI
高影响因子
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