JOURNAL OF HAZARDOUS MATERIALS
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2020
·
IF 9.038
Jingzhen Wang,Yingnan Wang,Chunshuai Cao,Ying Zhang,Yinqing Zhang,Lingyan Zhu
Perfluorooctanoic acid (PFOA) is highly stable due to the strong C F bond and extremely difficult to be removed by conventional photocatalysts. In this study, Bi doped BiOI 1-x F x solid solutions with hollow microsphere structure were prepared through a facile one-step hydrothermal method. Compared with pure BiOI and BiOF, the band gap of the Bi/BiOI 1-x F x solid solutions was significantly reduced, thus promoting the visible light absorbance. The cavity structure of the BiOI 1-x F x solid solutions enhanced the surface areas and active sites for reaction. The local electromagnetic field dominated by surface plasmon resonance (SPR) effect of Bi metal on the surface favored the separation of the photoinduced charge pairs. As a consequence, Bi/BiOI 0.8 F 0.2 (x = 0.20, the doping amount of fluorine was 20 %) composite displayed the best photocatalytic performance for decomposing PFOA, and 40 mg/L PFOA could be removed within 2 h illumination. The degradation rate constant (k = 0.0375 min −1 ) of PFOA by Bi/BiOI 0.8 F 0.2 was about tenfold of that by pure BiOI and BiOF. Superoxide radical ( · O 2 -) predominated in the degradation of PFOA by Bi/BiOI 0.8 F 0.2 , and the possible degradation pathway of PFOA by Bi/BiOI 0.8 F 0.2 was proposed. This work provides a highly efficient catalyst for the practical application in removal of highly persistent PFOA.
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高影响因子
SOLAR ENERGY
·
2020
·
IF 4.608
Nasir Ali,Sanam Attique,Sajid Rauf,Xiaoyu Wang,Amir Khesro,Shahid Ali,Muhammad Imran Asghar,Shikuan Yang,Peter D. Lund,Huizhen Wu
Bismuth is considered as one of the most promising candidates to replace Pb in the organo-lead halide perovskite, a classical material for various optoelectronic applications. When utilized in a photovoltaic cell, the performance of the cell drops due to deterioration in the absorber film and the changes in its crystal structures. In this work, a small amount of dodecylammonium chloride, C 12 H 25 NH 3 Cl (DCl) is added into Cs 3 Bi 2 I 9 (CBI), resulting in a pinhole-free high-quality perovskite (PVK) film via a single-step solution processability, also confirmed by FTIR and XPS analyses. Structural, optical, and microscopic analyses showed that the quality, surface features, and crystallinity of the CBI films are significantly improved by adding DCl. The prepared films are successfully demonstrated in a solar cell and exhibited considerably improved photovoltaic (PV) characteristics (V OC by ~47%, J SC by ~33%, FF by 13%, and PCE by 115%) over pure CBI-based devices. Moreover, the PV device retained more than 95% of its initial PCE in the ambient laboratory environment (relative humidity 55±5%). To the best of our knowledge, this is the highest PCE along with extended environmental stability reported for solution processed CBI-based perovskite solar cells.
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ADVANCED ENGINEERING MATERIALS
·
2020
·Vol. 22
·期 8
·2000162
·
IF 3.217
Qingxiao Meng,Jianyong Feng,Huiting Huang,Xiaopeng Han,Zhi Zhu,Tao Yu,Zhaosheng Li,Zhigang Zou
Both phase and morphology of perovskite films are very important for high-performance optoelectronic devices. Although a two-step method based on CsBr ethylene glycol monomethylether (EGME) solution can prepare pure-phase CsPbBr 3 films, they have a poor morphology due to excessive Ostwald ripening. Herein, a bi-solvent engineering strategy is demonstrated to simultaneously optimize phase and morphology of CsPbBr 3 films in a two-step solution method, which uses the bi-solvents of EGME and isopropanol (IPA) instead of EGME for CsBr solution at the second step. Optimizing the volume ratio of bi-solvents and immersion time can control the Ostwald ripening effectively and result in pure-phase, compact, and smooth CsPbBr 3 films. Finally, the prepared films are applied to perovskite solar cells (PSCs) with a structure of fluorine-doped tin oxide (FTO)/compact TiO 2 (c-TiO 2 )/CsPbBr 3 /carbon. In comparison with EGME, the champion power conversion efficiency (PCE) of devices from EGME/IPA bi-solvents increases from 3.57% to 7.29% owing mainly to higher coverage, smoother surface, and lower trap density of CsPbBr 3 films from EGME/IPA bi-solvents. This work provides a simple and efficient method for the preparation of high-quality CsPbBr 3 films.
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Applied Materials Today
·
2022
·
IF 8.663
Sheng Jie Yuan,Zhong Quan Peng,Min Zhi Rong,Ming Qiu Zhang
To prepare oriented crosslinked liquid crystalline polymers (LCPs) while preventing the unwanted anisotropy, the authors fabricated interlocked networks from liquid crystalline epoxy and amorphous polyurethane, which are crosslinked by reversible Diels-Alder (DA) bonds and Schiff base, respectively. By making use of dynamicity of the reversible bonds as well as relative mobility of the parent networks of the interlocked networks, the material is subjected to stepwise solid-state bi-directional drawing. Owing to the directional alignment of the mesogens and molecular chains and the increased crosslinking density during stretching caused by the networks reshuffling, the strengths of the material in orthogonal directions are simultaneously improved and gradually converged to the values comparable to the reported highest level of unidirectionally orientated crosslinked LCPs. Furthermore, the biaxially oriented interlocked networks have inherited the intrinsic self-healing capability from the included reversible bonds. The proposed method is easy to use and expected to contribute to the practical applications of crosslinked LCPs, which is becoming more and more important in modern microelectronics and communication technology.
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Journal of Energy Chemistry
·
2023
·
IF 13.1
Yuting He,Hongtao Li,Yi Wang,Yufei Jia,Yongning Liu,Qiang Tan
M−N−C (M = Fe, Co, Ni, etc.) catalyst owns high catalytic activity in the oxygen catalytic reaction which is the most likely to replace the Pt-based catalysts. But it is still a challenge to further increase the active site density. This article constructs the high-efficiency FeMn-N/S-C-1000 catalyst to realize ORR/OER bifunctional catalysis by hetero-atom, bimetal (Fe, Mn) doped simultaneously strategy. When evaluated it as bi-functional electro-catalysts, FeMn-N/S-C-1000 exhibits excellent catalytic activity ( E 1/2 = 0.924 V, E j =10 = 1.617 V) in alkaline media, outperforms conventional Pt/C, RuO 2 and most non-precious-metal catalysts reported recently. Such outstanding performance is owing to N, S co-coordinated with metal to form multi-types of single atom, dual atom active sites to carry out bi-catalysis. Importantly, nitrite poison test provides the proof that the active sites of FeMn-N/S-C are more than that of single-atom catalysts to promote catalytic reactions directly. To better understand the local structure of Fe and Mn active sites, XAS and DFT were employed to reveal that FeMn-N 5 /S-C site plays the key role during catalysis. Notably, the FeMn-N/S-C-1000 based low-temperature rechargeable flexible Zn-air also exhibits superior discharge performance and extraordinary durability at −40 °C. This work will provide a new idea to design diatomic catalysts applied in low-temperature rechargeable batteries.
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Journal of Energy Storage
·
2023
·
IF 9.4
Rui Wang
Zinc-bromine flow battery (ZBFB) is one of the most promising energy storage technologies due to their high energy density and low cost. However, their efficiency and lifespan are limited by ultra-low activity and stability of carbon-based electrode toward Br 2 /Br − redox reactions. Herein, chitosan-derived bi-layer graphite felt (CS-GF) with stable physical structure and abundant active sites is proposed and developed as cathodes for ZBFBs. In this uniquely developed electrode, the catalyst layer possesses oxygen and nitrogen co-doped surface enables high activity for redox reaction, whilst the wrapping structure enhances bonding force between catalyst layer and supporting layer to keep the stability against electrolyte flow. Moreover, the closely-bonding and partially-cracked catalyst layer ensures low electrical resistance between two layers and further emerges more inside active sites for bromine ions reactions. Consequently, the bi-layer electrode is demonstrated high electrochemical activity towards bromine ion redox reactions by cyclic voltammetry and electrochemical impedance spectra test. In battery charge-discharge measurements, a ZBFB employing CS-GF electrode yields a high current density of 120 mA cm −2 , with an ultra-high coulombic efficiency of 99 % and improved energy efficiency of 69 %. Furthermore, the proposed bi-layer electrode enables stable battery performance, which cycle for more than 100 cycles with minor 0.057 % energy efficiency decay per cycle. This work provides a promising strategy to develop high-activity and high-stability electrode that possesses great application potentials in ZBFBs and other energy storage systems .
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2023
·
IF 9.9
Lixia Wang,Yanjing Qin,Huatong Li,Zhiyang Huang,Mingcheng Gao,Tayirjan Taylor Isimjan,Xiulin Yang
Designing multi-channel mesoporous structure and introducing oxygen vacancies to synergistically enhance oxygen reduction reaction (ORR) activity is crucial for the practical application of zinc-air batteries (ZABs) in the field of energy storage and conversion. Herein, a novel multi-channel mesoporous Bi-Fe 2 O 3 microsphere with abundant oxygen vacancies supported on nitrogen-doped carbon (denoted as Bi-Fe 2 O 3 @NC) is constructed and the designated catalyst demonstrates a higher half-wave potential (0.88 V), large limiting current density (5.8 mA cm −2 @0.4 V), and superior stability. Besides, the aqueous ZAB utilizing Bi-Fe 2 O 3 @NC cathode achieves a high power density of 198.6 mW cm −2 and maintains exceptional stability for 459 h at 5 mA cm −2 , superior to most previously reported catalysts. Furthermore, a solid-state ZAB assembled with Bi-Fe 2 O 3 @NC shows a power density of 55.9 mW cm −2 , highlighting its potential for flexible ZAB applications. The prominent ORR performance of Bi-Fe 2 O 3 @NC can be ascribed to its unique multi-channel mesoporous structure and abundant oxygen vacancies, which increase the exposure of active sites and facilitate efficient electron/mass transport. This work provides valuable insights for the rational design of advanced ORR catalysts for the practical requirements of aqueous/flexible ZABs in energy storage and conversion.
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JOURNAL OF ENVIRONMENTAL MANAGEMENT
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2023
·
IF 8.7
Xiongfang An,Xiaolin Xu,Weijie Guo,Zepu Chen,Zhiyin Miao,Jiayi Yuan,Zhansheng Wu
Significant progress has been made in the development of phosphorus recovery adsorbents and photocatalysts for degradation of pesticides. However, the bifunctional materials for phosphorus recovery and photocatalytic degradation of pesticides have not been designed, and the mechanism of the interaction between photocatalysis and P adsorption remains unexplored. Herein, we develop biochar-g-C 3 N 4 -MgO composites (BC-g-C 3 N 4 -MgO) with bi-function application to minimize water toxicity and eutrophication. The results show phosphorus adsorption capacity of the BC-g-C 3 N 4 -MgO composite reaches 111.0 mg·g-1, and its degradation ratio of dinotefuran reaches 80.1% within 260 min. The mechanism studies show that MgO can play variety roles in BC-g-C 3 N 4 -MgO composite, in which can improve the adsorption capacity of phosphorus, enhance the utilization efficiency of visible light and the separation efficiency of photoinduced electron-hole pairs. The biochar existed in BC-g-C 3 N 4 -MgO serves as charge transporter with a good conductivity, which promotes the fluent transfer of photo-generated charge carriers. The ESR indicates that both • O 2 − and •OH generated from BC-g-C 3 N 4 -MgO are responsible for dinotefuran degradation. Finally, pot experiments reveal that P laden BC-g-C 3 N 4 -MgO promotes the growth of pepper seedlings with high P utilization efficiency of 49.27%.
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Defence Technology
·
2023
·
IF 5.1
Chao Wang,Ying Liu,Mingze Wu,Jia Li,Ying Feng,Xianjin Ning,Hong Li,Ningfei Wang,Baolu Shi
A novel design of micro-aluminum ( μ Al) powder coated with bi-/tri-component alloy layer, such as: Ni–P and Ni–P–Cu (namely, Al@Ni–P, Al@Ni–P–Cu, respectively), as combustion catalysts, were introduced to release its huge energy inside Al-core and promote rapid pyrolysis of ammonium perchlorate (AP) at a lower temperature in aluminized propellants. The microstructure of Al@Ni–P–Cu demonstrates that a three-layer Ni–P–Cu shell, with the thickness of ∼100 nm, is uniformly supported by μ Al carrier (fuel unit), which has an amorphous surface with a thickness of ∼2.3 nm (catalytic unit). The peak temperature of AP with the addition of Al@Ni–P–Cu (3.5%) could significantly drop to 316.2 °C at high-temperature thermal decomposition, reduced by 124.3 °C, in comparison to that of pure AP with 440.5 °C. It illustrated that the introduction of Al@Ni–P–Cu could weaken or even eliminate the obstacle of AP pyrolysis due to its reduction of activation energy with 118.28 kJ/mol. The laser ignition results showed that the ignition delay time of Al@Ni–P–Cu/AP mixture with 78 ms in air is shorter than that of Al@Ni–P/AP (118 ms), decreased by 33.90%. Those astonishing breakthroughs were attributed to the synergistic effects of adequate active sites on amorphous surface and oxidation exothermic reactions (7597.7 J/g) of Al@Ni–P–Cu, resulting in accelerated mass and/or heat transfer rate to catalyze AP pyrolysis and combustion. Moreover, it is believed to provide an alternative Al-based combustion catalyst for propellant designer, to promote the development the propellants toward a higher energy.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Wei Mao,Liguo Wei,Xiaohu Xu,Lishuang Zhao,Junyun Liu,Zihan Zhang
To screen out suitable electrode materials and overcome the shortcomings of the existed electrode materials for the application in dye-sensitized solar cells and supercapacitors , NiS 2 /reduced graphene oxide (NiS 2 /rGO) composite material was prepared by a simple one-step hydrothermal method in this paper and applied in the field of both dye-sensitized solar cells and supercapacitors as electrode material. In an electrolyte of 6 M KOH, the NiS 2 /rGO composite material with bilayer capacitance characteristics exhibited a high specific capacitance of 259.20 F g −1 at the current density of 0.6 A g −1 , which was significantly higher than that of rGO (188.94 F g −1 ). Moreover, at a current density of 2 A g −1 , the NiS 2 /rGO composite material had 92.85% capacitance retention after 2000 cycles. When applied as counter electrode material for the dye-sensitized solar cells, the NiS 2 /rGO composite material counter electrode exhibited a satisfactory photoelectric conversion efficiency ( η ) of 3.16% under standard simulated sunlight (AM 1.5 G), which was significantly higher than that of single rGO counter electrode (improved by 90.40%). The NiS 2 /rGO composite electrode material prepared by a simple one-step hydrothermal method is a potential bi-functional composite electrode materials for both dye-sensitized solar cells and supercapacitors.
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SOLID STATE SCIENCES
·
2019
·
IF 2.155
Yunfang Huang,Hui Xu,Dan Luo,Yuezhu Zhao,Yu Fang,Yuelin Wei,Leqing Fan,Jihuai Wu
Full-spectrum-responsive Ag/Bi/BiOCl hierarchical micro-flower heterojunction via a facile in-situ solvothermal route. The samples were characterized by XRD , SEM, TEM , XPS , BET and UV–Vis–NIR. The in-situ incorporation of Bi into the semiconductor BiOCl nanosheets with oxygen vacancies could be regulated efficiently by the Ag + additive content. The samples presented a strong optical absorption in the whole region of 200–2400 nm and displayed excellent photocatalytic performance over the full solar spectrum. The presence of metallic Ag, Bi and oxygen vacancies strengthened the light absorption and promoted the charge-carrier separation of BiOCl, resulted in higher photocatalytic activity than that of pure BiOCl and P25 under UV and visible light irradiation. Furthermore, the photocatalytic responsiveness of Ag/Bi/BiOCl was successfully extended to the NIR region. On the basis of the radical species trapping experiments, h + , •O 2 − , and •OH were confirmed to be the mainly active species involved in the degradation of organic pollutants in the NIR region.
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Soft Matter
·
2018
·Vol. 14
·期 43
·8764-8770
·
IF 3.709
Botian Li,Da Xiao,Dongsheng Deng,Haimu Ye,Qiong Zhou,Liming Tang
In this study, a novel self-assembled metal–organic gel was synthesized from ferric nitrate and a di-topic ligand, bis(3-pyridyl)terephthalate. The gel consisted of a three dimensional network of uniform nanofibers. The gelation exhibited high selectivity to Fe(III) based on metal–ligand coordination. The molar ratio of Fe3+ to ligand had a large influence on the assembly process and the morphology of the gel. The metallogel displayed multi-stimuli responsiveness and excellent heat resistance, thus was further applied as a thermo-stable template for the polymerization of N,N′-methylene bisacrylamide to produce the core/shell polymer composite nanowires. Subsequently, the polymer nanotubes were obtained after ammonia post-treatment, comfirming the feasibility of the template synthesis strategy. According to the rheological measurements, the gel-like products of the composite nanowires exhibited better mechanical strength compared to the gel template.
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危险品化学品经营许可证（带存储）