RSC Advances
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2020
·Vol. 10
·期 7
·4064-4070
·
IF 3.119
Yingna Chang,Qidong Dang,Imran Samo,Yaping Li,Xuejin Li,Guoxin Zhang,Zheng Chang
The removal of heavy metal contaminants has aroused global attention due to water shortage and the lax control on the discharge of heavy metal pollutants. Capacitive deionization (CDI) has emerged as a robust, energy-/cost-efficient technique for water treatment. Herein, we reported the simple synthesis of N, S-co-doped carbon materials (NS-C) derived from PVC plastic wastes as CDI electrode materials for the efficient removal of heavy metal ions (HMIs). The NS-C exhibited a large specific surface area (∼1230 m2 g−1) and contained heavy heteroatom doping (∼4.55 at% N and ∼13.30 at% S). The CDI electrode fabricated using NS-C showed high removal efficiency (94–99%), high capacity (36–62 mg g−1), and good regeneration capability for the adsorption of various kinds of low-concentration heavy metal ions (including Fe2+, Co2+, Ni2+, Cu2+, Pb2+, and Cd2+). Moreover, PVC plastic wastes that are heavily accumulated in the environment and extremely hard to be decomposed and recycled were applied as the carbon source in this study for the fabrication of NS-C, which further rendered the importance of our study in practically treating hazardous waste (HMIs) with waste (PVC plastic wastes) in a clean and efficient way.
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PubMed
高影响因子
ACS Applied Energy Materials
·
2020
·
IF 4.473
Ming Chen,TrungHieu Le,Yuanxiang Zhou,Feiyu Kang,Ying Yang
Developing advanced carbon nanomaterials with reasonable pore distribution and interconnection and matching the charge-storage capacities and electrode kinetics between the capacitive electrode and the battery-type electrode are two of the biggest challenges in lithium-ion capacitors (LICs). In this work, a sustainable strategy to fabricate N/S dual-doped hierarchical porous carbon nanofibers (N/S-CNF) is developed via electrospinning and thiourea treatment, and the N/S-CNF is employed as both the capacitor-type cathode and the battery-type anode for LICs. With rational design, N/S-CNF can not only offer a large specific surface area with a hierarchical pore structure but also be uniformly doped with heteroatoms, which is desirable for improving the electrochemical performance of both the cathode and the anode for LICs and alleviating the mismatch between the two electrodes. LICs assembled with the designed N/S-CNF electrodes can deliver a high energy density of 154 Wh kg–1 with a stable capacitance retention of 92% after 6000 cycles. Our work is expected to open up new avenues for developing heteroatom-doped porous carbon nanomaterials applied in other energy conversion and storage devices.
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AIP Advances
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2021
·Vol. 11
·期 7
·
IF 1.548
Lv Xiaogong,Zhu Chengjun,Yang Yanchun,Liu Ruijian,Fan Wenliang,Wang Yiming
In this work, Cu 2 ZnSnS 4 (CZTS) precursor films were deposited using a water-based solution approach. Subsequently, selenization was performed at different temperatures in the range of 480–610 °C to prepare Cu 2 ZnSn(S,Se) 4 (CZTSSe) absorber-layer films. The effects of the selenization temperature on the crystallinity, structure, morphology, and photoelectric properties of CZTSSe thin films, as well as the performance of solar cells constructed using these films, were systematically studied. The absorber-layer films selenized at different temperatures all formed pure-phase CZTSSe and had basically the same film thickness. It was found that application of an optimal selenization temperature can enhance the crystallinity, crystal grain size, and mobility and reduce the resistivity of CZTSSe films. Selenization at 550 °C resulted in the largest grain size (∼ μ m), the highest crystallinity, the highest mobility (4.29 cm 2 V −1 s −1 ), the lowest resistivity (3.13 × 10 2 Ω cm), the thinner fine-grained layer, a bandgap value of 1.21 eV, and a Cu-poor, Zn-rich elemental composition [Cu/(Zn + Sn) = 0.85 and Zn/Sn = 1.16]. The power-conversion efficiency was improved from 3.04% in a CZTSSe cell device with an absorber layer selenized at 480 °C to 4.69% in a film selenized at 550 °C. This was mainly due to the improvement of the crystallinity, crystal grain growth, and reduction of the fine-grained layer of the CZTSSe film. These results show that optimizing the selenization temperature is essential for enhancing the performance and the ultimate device efficiency of CZTSSe absorber layers prepared using a water-based solution approach.
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CHEMICAL ENGINEERING JOURNAL
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2021
·
IF 13.273
Wenxiang Yang,Guozhi Ma,Yin Fu,Ke Peng,Hongli Yang,Xiaoqiang Zhan,Weiyou Yang,Lin Wang,Huilin Hou
The development of novel and efficient heterojunction photocatalysts is still a challenging issue for achieving highly efficient solar-to-chemical energy conversion. Herein, we report the construction of Ti 3 C 2 MXene@TiO 2 /CuInS 2 (M@T/CIS) integrated Schottky/step-scheme (S-scheme) heterojunction by two-step hydrothermal process for boosting photocatalytic hydrogen generation activity. The as-prepared M@T/CIS hybrid photocatalysts exhibit the synergistic effects for enhanced visible-light harvesting, improved charge transfer and increased active site for photocatalytic H 2 evolution. They deliver a H 2 evolution rate of 356.27 μmol g -1 h −1 , which is ∼ 69 and 636 times higher than those of M@T and CIS, respectively, representing their potential applications towards photocatalytic H 2 evolution.
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高影响因子
POLYMER DEGRADATION AND STABILITY
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2021
·
IF 5.03
Chao Wan,Huajun Duan,Chenhao Zhang,Jianfan Cao,Jiahao Zou,Junjun Zhang,Huiru Ma
In order to obtain an efficient flame retardant without sacrificing mechanical properties and transparency of epoxy resin (EP), a P/N/S-containing flame retardant (STP) by combining 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) with Schiff base intermediate synthesized by the reaction of sulfathiazole and 2-thenaldehyde was successfully synthesized. The synthesis of STP was verified and the properties of modified EP were studied. The test results indicated that STP slowed down the degradation rate of EP. The glass transition temperature (T g ) of the flame-retardant epoxy resin (FREP) samples were well maintained and even improved after introducing a certain amount of STP. Furthermore, FREP with low phosphorus content exerted excellent flame retardant ability, EP/5%STP (phosphorus content: 0.27 wt%) obtained the V-0 rating of UL-94 test with the value of limiting oxygen index (LOI) 33.5%. In contrast with EP, the peak heat release rate (PHRR), total heat release (THR) and total smoke production (TSP) of EP/7.5%STP were respectively decreased by 33.31%, 26.04% and 28.75%. Mechanical performance tests show that STP improved the tensile and flexural strength of EP. It is worth mentioning that the EP modified with STP still maintains good transparency.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2021
·
IF 5.316
Kristina Maliutina,Jiajia Huang,Tong Su,Jianglong Yu,Liangdong Fan
This work introduces nanostructured carbon-based composite with enriched CNTs and microstructural defects from pomelo peel biomass precursors through successive chemical pretreatment, heteroatom N, S dual-doping and transition metal oxide loading (Ta 2 O y ) and its application for electrochemical oxygen reduction reaction (ORR) at room temperature. During the microwave pyrolysis process, volatile N, S-containing species from trithiocyanuric acid reactant were trapped and doped into carbonaceous biomass precursor to achieving the rich-defect porous nanotubes and abundant cavity structure. The effect of biomass pretreatment on the textural and structural properties of biochar and formed CNTs were systematically investigated. The impacts of single doping (N) using melamine and dual-doping (N, S) with trithiocyanuric acid on the structural and electrochemical characteristics of biochar were evaluated. An optimized PP-NS-600-Ta-900 electrocatalyst displayed remarkable ORR activity with a half-wave potential of 0.82 V (vs. RHE), a limiting current density of −5.75 mA cm −2 and an electron transfer number of 3.85. The results offer a useful archetypical template to design and construct reliable CNTs enriched biomass-derived biochar for possible electrochemical energy and storage application, illustrating its viability for utilization as ORR electrocatalyst in potential applications, like fuel cells and metal-air batteries.
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高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Xin Li,Jingru Guan,Haopeng Jiang,Xianghai Song,Pengwei Huo,Huiqin Wang
Construction of multi-interface contact step-scheme (S-scheme) photocatalyst is a promising pathway to achieve high-electron transfer efficiency for photocatalytic CO 2 reduction. In this paper, g-C 3 N 4 nanosheets were selected as the main photocatalyst, rod-like CeO 2 (R-CeO 2 ) with unique Ce 4+ →Ce 3+ conversion property and rGO were loaded on the g-C 3 N 4 surface to construct 2D-1D-2D sandwich photocatalyst. The yields of CO and CH 4 were about 63.18 and 32.67 μmol/g after 4 h when the rGO/R-CeO 2 /g-C 3 N 4 was used as catalyst, which were about 4 and 6 times higher than that of pure CN, respectively. Cyclic experiments proved that the composite had excellent photocatalytic and material stability. Photoelectrochemical tests showed that the construction of S-scheme electron transfer model and the introduction of rGO can great enhance the electron transmission and separation of photogenerated electron-hole pairs. CO 2 adsorption test identified that the loading of R-CeO 2 and rGO obviously enhanced the CO 2 adsorption ability of pure g-C 3 N 4 . Density functional theory (DFT) calculations used to analyze the electron transfer path and the formation of the build-in electric field at the semiconductor interface. In-situ FTIR and 13 CO 2 element-tracer detection carried out to research the process of CO 2 photoreduction. A possible multi-interface contact S-scheme electron transfer mechanism for enhanced CO 2 photoreduction activity has been discussed.
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高影响因子
EUROPEAN POLYMER JOURNAL
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2021
·
IF 4.598
Jixian Li,Changjun Gong,Shuaikang Lv,Farong Huang
A series of poly(dimethylsilylene arylacetylene)s with different side alkoxy groups on the arylacetylene unit (named as PSA-(AO) resins), including methoxy (MO), ethoxy (EO), pentyloxy (PO), and decyloxy (DO), were synthesized from corresponding disubstituted diethynylbenzene and dichlorodimethylsilane. The processability, heat resistance and mechanical properties, and the effects of side alkoxy groups were investigated. The results show the processability of PSA-(AO) resins is improved, while the flexural properties and heat resistance of the relative cured resins decrease with the increase in the length of side alkoxy groups. The flexural strength and degradation temperature of 5% weight loss for the cured PSA-(EO) resin with side ethoxy groups reach 20.8 MPa and 415℃, respectively.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2019
·
IF 7.015
Jiandang Xue,Xin Liu,Junfeng Zhang,Yan Yin,Michael D. Guiver
The knowledge that N -spirocyclic quaternary ammonium (QA) cations appear to have good alkaline stability has triggered the quest to incorporate these into anion exchange membranes (AEMs) with the anticipation of high operating stability in alkaline fuel cells . Herein, a series of poly(2,6-dimethyl-1,4-phenylene oxide)s (PPOs) incorporating spirocyclic 3,6-diazaspiro[5.5]undecane (DSU) cation/cation strings are synthesized by a two-step quaternization strategy. The properties of DSU-based single-cation and double-cation AEMs (PPO-SDSU and PPO-DDSU, respectively) are discussed and the effect of introducing heterocyclic quaternary piperidinium (Qpip) on spirocyclic DSU cation strings is investigated. Ionic clusters of larger size scattering are observed by atomic force microscopy for PPO-SDSU membranes, suggesting the dominant effect of polar tertiary nitrogen atom on the formation of ion cluster. The well-connected hydrophilic domains contributed to further increasing the water uptake and hydroxide conductivity of the AEMs. As a result, the PPO-SDSU membrane with ion exchange capacity (IEC) of 1.91 meq/g shows the highest hydroxide conductivity (31.9 mS/cm) with 76% water uptake and 9.6% linear dimensional swelling at 20 °C. Alkaline stability tests imply that the presence of Qpip in DSU cation strings alleviates the degradation of spirocyclic QA from S N 2 substitution, due to increased steric hindrance, but other considerations must address the potentially detrimental effect of Hofmann elimination on spirocyclic QA and PPO backbone scission, arising from the electron withdrawing effect of Qpip. Although hydroxide conductivity and IEC values were better retained for PPO-DDSU membranes, the inferior alkaline stability of the benzylic attached Qpip counteracted the overall stability enhancement anticipated for incorporating spirocyclic DSU cations. These results may provide valuable insights toward more effective molecular designs and new synthetic pathways to AEMs incorporating base-stable N -spirocyclic QA.
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高影响因子
Sustainable Energy & Fuels
·
2019
·Vol. 4
·期 4
·1621-1629
·
IF 4.912
Yachao Du,Qingwen Tian,Jin Huang,Yuechao Zhao,Xiaohuan Chang,Afei Zhang,Sixin Wu
Additional elements in Cu2ZnSn(S,Se)4 (CZTSSe) absorber layers present a viable strategy to improve the performance of thin film solar cells. In this study, heterovalent cation doping by partially substituting metal cations with Ga3+ is explored by constructing a sandwich-like configuration. We demonstrated that a low doping level of Ga3+ can be successfully incorporated into the host lattice of CZTSSe to form a homogeneous Cu2ZnSn(Ga) (S,Se)4 (CZTGSSe) alloy material. Characterization was performed using SEM, EDS, XRD, Raman spectroscopy, and XPS, which showed that the material fabricated by this heterovalent cation doping method expressed high phase purity, appropriate valence components, and suitable optical bandgap, which are vital for high performance solar cells. As a result, the champion device achieves stabilized efficiency as high as 10.80%, improved by nearly 28% compared with only 8.43% for the reference device.
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高影响因子
JOURNAL OF POLYMER RESEARCH
·
2019
·Vol. 26
·期 12
·1-12
·
IF 1.53
Jiao Yang,Chen Guofei,Zhou Haijun,Zhang Feng,Chen Xiaoqi,Li Yantao,Xiao Xueshan,Fang Xingzhong
A series of poly(benzimidazole-imide)s (PBIPIs) derived from different dianhydrides and 2-(3-aminophenyl)-5-aminobenzimidazole ( m -BIA) were synthesized via thermal imidization to form flexible films. This series of PBIPIs showed great T g s ranging from 296 to 484 °C, excellent thermal stability performed in 5% weight loss temperatures ( T d5% s) of 502–529 °C in N 2 and good mechanical properties (tensile strengths of 89–127 MPa, tensile moduli of 2.9–4.1 GPa and elongations at break of 3.9–6.9%). Compared with PIs derived from 6-amino-2-(4-(4-aminophenoxy)phenyl)-1H-benzimidazole ( p -BIODA), m -BIA based PBIPI films exhibited higher T g , and better solubility. Besides, the thermoplastic PBIPI resin (PI-6-PA) derived from 2,2-bis[4-(3,4-dicarboxyphenoxy)phenyl]propane dianhydride (BPADA) and m -BIA exhibited good melt processability with high T g of 273 °C, melt flow index (MFI) of 7.76 g/10 min, minimum complex viscosity of 11.9 × 10 3 Pa·s at 402 °C and low melt viscosity ratio of 2.46 at 400 °C.
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高影响因子
Advanced Energy Materials
·
2019
·Vol. 9
·期 14
·1803935
·
IF 24.884
Yanyan Liu,Miaomiao Han,Qizhong Xiong,Shengbo Zhang,Cuijiao Zhao,Wanbing Gong,Guozhong Wang,Haimin Zhang,Huijun Zhao
The Haber-Bosch process can be replaced by the ambient electrocatalytic N 2 reduction reaction (NRR) to produce NH 3 if suitable electrocatalysts can be developed. However, to develop high performance N 2 fixation electrocatalysts, a key issue to be resolved is to achieve efficient hydrogenation of N 2 without interference by the thermodynamically favored hydrogen evolution reaction (HER). Herein, in-operando created strong Li–S interactions are reported to empower the S-rich MoS 2 nanosheets with superior NRR catalytic activity and HER suppression ability. The Li + interactions with S-edge sites of MoS 2 can effectively suppress hydrogen evolution reaction by reducing H* adsorption free energy from 0.03 to 0.47 eV, facilitate N 2 adsorption by increasing N 2 adsorption free energy from –0.32 to –0.70 eV and enhance electrocatalytic N 2 reduction activity by decreasing the activation energy barrier of the reaction control step (*N 2 → *N 2 H) from 0.84 to 0.42 eV. A NH 3 yield rate of 43.4 μg h −1 mg −1 MoS 2 with a faradaic efficiency (FE) of 9.81% can be achieved in presence of strong Li–S interactions, more than 8 and 18 times by the same electrocatalyst in the absence of Li–S interactions. This report opens a new way to design and develop catalysts and catalysis systems.
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高影响因子
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