JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2020
·Vol. 167
·期 12
·122511
·
IF 3.721
Zhihao Lu,Chengjun Liu,Yingying Yue
In this paper, the feasibility of electrolysis of Cu2S and FeS in sulfur-containing carbon saturated iron melt aided by liquid lead cathode is studied by cyclic voltammetry and potentiostatic electrolysis at 1300 °C. The Cu2S and FeS are electro-reduced on the lead cathode and the product copper dissolve into the liquid lead while the product iron dissolves into iron melt due to the difference of solubility. An insert graphite rod in iron melt was used as the anode, on which the S2− is oxidized to S. This finding provides a new way for refining sulfide impurities in iron-based melt.
研究领域:
冶金学
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电化学
✓ 已验证
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2021
·
IF 7.963
Han Ye,Kun Gao,Guining Lu,Yingying Xie,John R. Reinfelder,Weilin Huang,Xueqin Tao,Xiaoyun Yi,Zhi Dang
Metal sulfides, which are important indicators of sulfur cycling, are usually divided into two categories according to sulfur chemical valence: (1) monosulfides (S 2− ) and (2) disulfides (S 2 2− ). The two sulfur species are separated and quantified by a sequential-extraction method. Specifically, monosulfides are extracted as acid-volatile sulfide (AVS) using 6 M HCl prior to the extraction of disulfides using acidic CrCl 2 , which is defined as chromium-reducible sulfur (CRS). However, the conventional AVS procedure does not result in the quantitative extraction of S 2− from the acid-insoluble metal monosulfide, copper sulfide (CuS). Consequently, residual sulfur in CuS (CuS-S) may be extracted as CRS resulting in the inaccurate separation of these two sulfur species. In this study, we used stannous chloride (SnCl 2 ) to improve CuS-S recovery in the AVS procedure and permit the separate extraction of sulfur from CuS and pyrite (FeS 2 ), the most abundant disulfide in nature. Our results show that the addition of SnCl 2 increased the recovery of CuS-S as AVS from less than 36% to as high as 92% in the absence of pyrite and Fe 3+ and 89% in the presence of pyrite and Fe 3+ . In addition, based on the observed correlation between the concentration of SnCl 2 and the dissolution of FeS 2 , we identified the appropriate concentration of SnCl 2 needed to avoid the dissolution of FeS 2 in the AVS procedure. SnCl 2 also minimized the oxidation of CuS-S by Fe 3+ released from ferric minerals during the extraction of AVS. Based on the results of a series of sequential-extraction experiments, we show that an amendment of SnCl 2 in the AVS procedure followed by CRS permits the quantitative separation of CuS-S and FeS 2 -S while also preventing interference by Fe 3+ . Our method will find application in research concerned with the fate of metals and the biogeochemistry of sulfur in the environment.
研究领域:
环境科学
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矿物学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Energy Chemistry
·
2022
·
IF 13.599
Jingjing Cai,Huijun Liu,Yulin Luo,Yuqing Xiong,Lizhu Zhang,Sheng Wang,Kang Xiao,Zhao-Qing Liu
Bimetallic sulfides, integrating the merits of individual components, are ideal structures for efficient electrocatalysis. However, for bimetallic sulfides including metal sulfide heterojunctions (MSH) and single-phase bimetallic sulfides (SBS), it is still unclear about which one has better catalytic activity toward reversible oxygen catalysis and its difference on catalytic mechanism. In this work, we demonstrate a bimetallic sulfide electrocatalyst that could transform from metal sulfide heterojunction (CoS/FeS) to single-phase bimetallic sulfide (CoFeS 2 ) through a facile temperature control strategy. The single-phase bimetallic sulfide (CoFeS 2 ) affords high intrinsic activity, fast reaction kinetics and superior durability toward oxygen evolution reaction (OER) and oxygen reduction reaction (ORR). Density functional theory (DFT) simulations reveal that the (CoFeS 2 ) has homogeneous electron distribution of the CoFeS 2 structure, improves the central energy level of d band, and optimizes the O* and OOH* intermediate and efficiently reduces the energy barrier of the reaction rate-determining step (RDS). The assembled rechargeable zinc-air battery is more stable than the Pt/C and IrO 2 assemblies due to the excellent electrocatalytic activity and stability of CoFeS 2 /NC, suggesting that it has potential for use in practical applications.
研究领域:
材料科学
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电化学
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理论计算
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 7
·3834-3844
·
IF 11.301
Daying Guo,Zihe Zhang,Bin Xi,Zhisheng Yu,Zhen Zhou,Xi'an Chen
Reported herein is the investigation of a unique cathode candidate for Li–S batteries, i.e. Ni3S2/(N, S)-RGO-type hybrid materials, which are expected to optimize battery performance by elevating the utilization of sulfur and chemically confining the adsorption/diffusion of polysulfide. Versatile structural and compositional characterizations confirmed the uniform growth and strong chemical coupling of nanostructured Ni3S2 on the N/S co-doped RGO matrix. Rich physical and chemical properties were revealed, namely, the large specific surface area and pore volume, which are beneficial for polysulfide capture, and the 3D conductive network supporting rapid charge transfer to the Ni3S2-polysulfide interface to improve the intrinsic equilibrium of the polysulfide. Specifically, the integration of ∼28.2 wt% of Ni3S2 produced a highly pleated composite with the largest BET specific surface area (618 m2 g−1) and pore volume (1.73 cm3 g−1) among the hybrids studied. This typical material also performed the best in the battery test, recording ultra-high cycling stability over 1000 cycles at the current density of 3C with the capacity decay of 0.023% per cycle. As the sulfur loading per unit area became as dense as 5.8 mg cm−2, the specific capacities were measured as 6.72 mA h cm−2 (at 0.05C), while the capacity retention for the 200-cycle test (at 1C) was still preserved above 72.5%.
研究领域:
材料科学
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电化学
·
能源存储
✓ 已验证
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2020
·
IF 6.551
Chenhui Wei,Shujun Yin,Heyun Fu,Xiaolei Qu,William A. Mitch,Dongqiang Zhu
Here we investigated the mediation efficiency of different size fractions of rice straw-derived black carbon (BC) using sulfide-induced nitrobenzene reduction as a model system. The bulk BC was divided into three size fractions: dissolved BC (size <0.45 μm), colloidal BC (0.45 μm < size < 1 μm), and particulate BC (size > 1 μm). With the presence of BC fractions (250 mg/L) nitrobenzene reduction by Na 2 S was significantly facilitated, wherein the mediation efficiency was positively correlated with the BC fraction's oxygen group content in an order of particulate BC < colloidal BC ≪ dissolved BC. Consistently, the oxidation treatment of particulate BC with O 3 or HNO 3 improved the mediation efficiency, whereas the reduction treatment with NaBH 4 reduced the mediation efficiency. The supernatant collected with dialysis or filtration of suspension of BC materials pre-reacted with Na 2 S could effectively reduce nitrobenzene, suggesting that reactive reducing sulfur species were produced in aqueous solutions by reacting sulfide only with BC materials. This was evidenced by the fact that polysulfides and polysulfide radicals were both detected in the supernatant. As demonstrated by electron paramagnetic resonance analysis, the quinone moieties at the surface of BC materials accepted electrons from sulfide and turned into semiquinone free radicals, consequently leading to formation of reactive reducing sulfur species and thus enhanced nitrobenzene reduction. The strong mediation efficiency on redox reactions observed for colloidal BC and dissolved BC combined with their significant mobility in subsurface environments indicate that these carbonaceous materials may play an important role in the fate process of organic contaminants as both carriers and catalysts. Capsule The surface quinone moieties of BC induce the formation of reactive reducing sulfur species by acting as one-electron acceptors and facilitate nitrobenzene reduction by sulfide.
研究领域:
环境科学
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化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Xuliang Lin,Lijing Xue,Bowen Liu,Xueqing Qiu,Jianglin Liu,Xiaofei Wang,Yi Qi,Yanlin Qin
The development of highly active and stable earth-rich electrocatalysts remains a major challenge to release the reliance on noble metal catalysts in sustainable (electro)chemical processes. In this work, metal sulfides encapsulated with S/N co-doped carbon were synthesized with a one-step pyrolysis strategy, where S was introduced during the self-assembly process of sodium lignosulfonate. Due to the precise coordination of Ni and Co ions with lignosulfonate, an intense-interacted Co 9 S 8 –Ni 3 S 2 heterojunction was formed inside the carbon shell, causing the redistribution of electrons. An overpotential as low as 200 mV was obtained over Co 9 S 8 –Ni 3 S 2 @SNC to reach a current density of 10 mA cm −2 . Only a slight increase of 14.4 mV was observed in a 50 h chronoamperometric stability test. Density functional theory (DFT) calculations showed that Co 9 S 8 –Ni 3 S 2 heterojunctions encapsulated with S/N co-doped carbon can optimize the electronic structure, lower the reaction energy barrier, and improve the OER reaction activity. This work provides a novel strategy for constructing highly efficient and sustainable metal sulfide heterojunction catalysts with the assistance of lignosulfonate biomass.
研究领域:
材料科学
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电催化
·
可再生能源
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Catalysis Science & Technology
·
2020
·Vol. 10
·期 10
·3247-3254
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IF 5.721
Xinran Ding,Tao Yang,Wenxian Wei,Yihui Wang,Kai Xu,Zizheng Zhu,Hong Zhao,Tingting Yu,Dongen Zhang
Hydrogen has great promise as an energy carrier superior to traditional fossil fuels. Electrochemical water splitting is expected to be an effective and sustainable method for producing high-purity hydrogen fuel cleanly. The hydrogen evolution reaction (HER) is the cathodic reaction in the electrochemical water-splitting process and requires efficient catalysts. However, the state-of-the-art Pt suffers from high cost and rare reserves, which significantly limit its extensive applications in the hydrogen evolution reaction for water splitting. Although its catalytic activity still falls far short of expectations, molybdenum sulfide has emerged as one of the most promising catalysts for HER due to its abundant reserves and high tunability. Here, we have reported the synthesis and HER catalytic performance of a hybrid lanthanum sulfide/molybdenum sulfide (La2S3–MoS2) catalyst. The formation of molybdenum sulfide nanosheets in situ with lanthanum sulfide deposition was achieved through a facile one-pot solvothermal strategy. The present catalyst displayed much superior activity for HER to pristine and commercial molybdenum sulfide; low overpotentials of 205 mV, 277 mV, 336 mV and 455 mV for the current densities of 10 mA cm−2, 50 mA cm−2, 100 mA cm−2 and 200 mA cm−2 were obtained, respectively, together with a low Tafel slope of 51 mV dec−1. Moreover, the present catalyst exhibited excellent stability in long-term hydrogen evolution. The remarkable HER performance might be mainly due to the expanded interlayer distance and the nano-interfaces between the molybdenum sulfide and lanthanum sulfide segments, which induced an increased exposure of active sites and a modified surface electronic structure.
研究领域:
材料科学
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能源化学
✓ 已验证
产品关联
DOI
高影响因子
FlatChem
·
2022
·
IF 5.829
Liwei Xiong,Yukang Fu,Gang Wang,Ze Zhang,Fengshou Wu,Xiaogang Luo,Chunyan Shang
The development of low-cost and high active electrocatalysts for hydrogen evolution reaction (HER) is essential for the sustainable energy and environment. Here we report a hydrothermal method to prepare ZnS@MoS 2 nanosheets with hydrangea-like superstructure for enhanced HER. Benefiting from their abundant edge sites and facilitated charge transfer, the ZnS@MoS 2 exhibited excellent HER performance with low overpotential of 106 mV and small Tafel slope of 73 mV dec −1 . In addition, the chronoamperometry measurement results suggested the well-remained current density for 36 h without significant change, which indicated the excellent stability of ZnS@MoS 2 superstructure. This work not only provides an effective method for constructing hierarchical heterojunctions, but also gives us a multi-scale strategy for the regulation of metal-based nanomaterials’ structure in energy-related applications.
研究领域:
材料科学
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能源科学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2015
·
IF 2.999
Xin Wang,Zhurong Liang,Xueqing Xu,Nan Wang,Jun Fang,Junxia Wang,Gang Xu
Highly Cu-rich copper indium sulfide (CuInS 2 , CIS) quantum dots were synthesized utilizing copper chloride (CuCl) and indium acetate (In(Ac) 3 ) as metal cation precursors, combined with n-dodecanethiol (DDT) as a coordinating sulfur source and solvent. With excess of In(Ac) 3 , i.e. with Cu/In ratios of 1/4, together with Zn 2+ ions post-treatment, a relatively high photoluminescence quantum yield (QY) of ∼73% with long average lifetime of ∼359 ns has been obtained, which is proposed to be attributed to the Cu-rich defect states in the CIS nanocrystals (NCs) nuclei. Meanwhile, the formation of In-rich CIS–ZnS alloy, i.e. Zn–Cu–In–S (ZCIS) with high density of Cu vacancies, combined with the surface passivation of ZnS overlay resulted in a high QY. Finally, the formation mechanism of the ZCIS/ZnS with Cu-rich nuclei has been proposed.
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2019
·
IF 14.229
Dan Yang,Liyun Cao,Liangliang Feng,Jianfeng Huang,Koji Kajiyoshi,Yongqiang Feng,Qianqian Liu,Wenbin Li,Li Feng,Guojuan Hai
The synergistic achievement of geometric optimization and surface/interfacial modulation of electrocatalysts for booting the overall efficiency of water splitting is highly desirable yet challenging. Herein, a novel hierarchical Ni 3 S 2 /VS 4 nanohorn array grown on nickel foam (NS-horn/NF) is prepared by a self-driven synthesis strategy. We demonstrate that in-situ generation of VS 4 in the NS-horn/NF not only triggers the formation of such unique hierarchical architecture, but favors the graft of enriched active bridging S 2 2− on the strong coupling interface between Ni 3 S 2 and VS 4 , and thus the enhanced HER kinetics. More importantly, the abundant active nickel oxides for the OER availably form on the interface benefiting from the surface reconstruction of NS-horn/NF due to the partial leaching of vanadium (IV) of VS 4 , which promotes the adsorption of OH − and leads to the fast OER rate-determining step in alkaline media. When employed to assemble an alkaline electrolyzer as both anode and cathode, NS-horn/NF electrode only needs a small voltage of 1.57 V to yield 10 mA cm −2 and retains this activity for at least 70 h. Our findings put forward fresh insights into the rational design of highly efficient bifunctional electrocatalysts toward water spitting for next-generation energy conversion and storage devices.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
Parasites & Vectors
·
2014
·Vol. 7
·期 1
·1-5
·
IF 3.251
Liu Xin Chao,Liu Qiyong,Zhou Ligang,Liu Zhi Long
Background During the screening programme for new agrochemicals from Chinese medicinal herbs and local wild plants, the essential oil of dried bulbs of Allium macrostemon Bunge (Liliaceae) was found to possess larvicidal activity against mosquitoes. The aim of this research was to determine the larvicidal activity of the essential oil and its major constituent compounds against the larvae of the Culicidae mosquito, Aedes albopictus.Methods Essential oil of A. macrostemon was obtained by hydrodistillation and analyzed by gas chromatography (GC) and gas chromaotography-mass spectrometry (GC-MS). The activity of the essential oil and its two major constituents were evaluated, using World Health Organization (WHO) procedures, against the fourth instar larvae of Ae. albopictus for 24 h and larval mortalities were recorded at various essential oil/compound concentrations ranging from 9.0 - 150 μg/ml.Results The essential oil of A. macrostemon exhibited larvicidal activity against the early fourth instar larvae of Ae. albopictus with an LC50 value of 72.86 μg/ml. The two constituent compounds, dimethyl trisulfide and methyl propyl disulfide possessed strong larvicidal activity against the early fourth instar larvae of Ae. albopictus with LC50 values of 36.36 μg/ml and 86.16 μg/ml, respectively.Conclusion The results indicated that the essential oil of A. macrostemon and its major constituents have good potential as a source for natural larvicides.
研究领域:
昆虫学
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植物化学
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公共卫生
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Frontiers of Optoelectronics
·
2022
·Vol. 15
·期 1
·1-9
·
IF 0
Zhou Xingwei,Zhang Wei,Zhang Zunhao,Wang Zizhun,Zou Xu,Li Dabing,Zheng Weitao
The oriented two-dimensional porous nitrogen-doped carbon embedded with CoS 2 and MoS 2 nanosheets is a highly efficient bifunctional electrocatalyst. The hierarchical structure ensures fast mass transfer capacity in improving the electrocatalytic activity. And the greatly increased specific surface area is beneficial to expose more electrocatalytically active atoms. For oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) tests in 1 mol/L KOH solution, only 194 and 140 mV overpotential are required to achieve a current density of 10 mA/cm 2 , respectively. Our research provides an effective strategy for synergizing the individual components in nanostructures for a wide range of electrocatalytic reactions. Graphical Abstract
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
危险品化学品经营许可证（带存储）