CARBON
·
2019
·
IF 7.466
Shakiaz Ahmad,Chao Yang,Wenyu Xie,Zhibo Deng,Heng Zhang,Yunlong Zhao,Xintai Su
The integration of two transition metals with carbon materials provides a great potential to boost the catalytic and electrochemical properties of supercapacitor . However, a scalable fabrication of such composite materials remains a challenge. Here, ternary composites of NiS–NiCo 2 O 4 @C nanosheets were derived from nickel and cobalt oleate using Na 2 SO 4 as both hard template and sulfur source. The NiS–NiCo 2 O 4 @C composites were then tested as catalysts toward rapid reduction of 4-nitrophenol (4-NP) and as electrode materials for supercapacitors. It was found that the catalytic and electrochemical properties of the composites were tuned by adjusting the ratios of Co to Ni and annealing temperature. The optimized composite showed the highest reduction rate constant for 4-NP reduction (1.78 min −1 ). In addition, this composite has also shown high specific capacitance of 1411 F g −1 at 1 A g −1 and 99.5% capacity retention after 2000 continuous charge-discharge cycles at a current density of 3 A g −1 , which is much higher than their respective monometallic Co and Ni composites. Furthermore, the ASC device (CN14//AC) achieved a high energy density of 37.2 W h kg −1 at a power density of 799.9 W kg −1 , and a good cycling performance of retention(89%) after 5000 cycles.
研究领域:
材料科学
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环境科学
·
电化学工程
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产品关联
DOI
高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2020
·
IF 3.442
Linjuan Wang,Ling Zan
Industrial wastewater containing heavy metal ions can cover the full pH range according to the manufacturing process. Alkaline wastewater treatment is still a great challenge because Cr 6+ therein has a more negative reduction potential (Cr 2 O 7 2− + 14H + + 6e − = 2Cr 3+ + 7H 2 O (E Cr 6+ (Cr2O7 2− /Cr 3+ ) = E θ − RT nF ln [ OH ] − ) than in acid solution, in which it can be easily reduced by numerous reagents. In this study, weakly alkaline Cr 6+ solution has been used to simulate weakly alkaline industrial wastewater, and a reagent capable of excellent reduction efficiency therein has been developed. A series of band-gap-energy-adjustable NiS-Zn x Cd 1- x S composites has been synthesized by a one-pot hydrothermal method . A more negative conduction band position for Zn x Cd 1- x S has been achieved by doping and changing the amount of Zn 2+ ions to ensure a superior photoreduction ability. All modified samples show excellent photocatalytic efficiency. For example, the reduction efficiency of 10%NiS–Zn 0.25 Cd 0.75 S sample is threefold higher than that of Zn 0.25 Cd 0.75 S and sixfold higher than that of CdS when deployed at a catalytic level for 30 min. Multiple characterization methods have been applied, and the results show that the improved efficiency can be ascribed to intimate contact between Zn 0.25 Cd 0.75 S and NiS. Photoluminescence (PL) and photocurrent measurements and electrochemical impedance spectroscopy (EIS) further elucidate the catalytic mechanism and imply an enhanced charge-carrier separation efficiency between Zn 0.25 Cd 0.75 S and NiS.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Ying Yan,Yi Peng,Jing Wang,Ziyang Xiang,Yanmei Li,Junhui Yang,Jinglin Yin,Hongbo Xiao,Wenlei Wang
The reutilization of exhausted biochar is attracting extensive interest among researchers. In this study, the biochar generated from Chinese fir with natural regular porous structure that adsorbed Cd 2+ /Ni 2+ at different concentration levels was used as the precursor, and then combined with simple hydrothermal vulcanization and ion deposition to generate the p-n heterojunction between NiS and CdS compounds (NiS-CdS@C) in situ. The hybrids with 3 cycles of NiS deposition reduced the interfacial transmission resistance from 80 Ω to 40 Ω, and increased photocurrent density by 5 times, thus effectively promoting the separation of photogenerated electrons and holes. The simultaneous removal of As(III) and Cr(VI) was selected to evaluate the oxidation and reduction capacity of the visible light/NiS-CdS@C/oxalate system. The results indicated that 10 mg/L As(III) and Cr(VI) were completely and simultaneously removed with 0.75 mM oxalate addition within 40 min in the system, and the NiS-CdS@C presented good durability and stability for oxalate activation. Electron paramagnetic resonance (EPR) and quenching experiments demonstrated that oxalate was activated by holes under light to produce •CO 2 − and enhanced the generation of additional •OH and •O 2 − , further contributing to the oxidation of As(III) and reduction of Cr(VI).
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
FUEL
·
2025
·
IF 7.5
Jing Fan,Yanan Yang,Jie Liu,Qi Qi,Fenhong Song
In light of the energy and environmental crises humanity faces, photocatalytic hydrogen production has emerged as one of the effective solutions. Nevertheless, the development of high-performance, low-energy-consumption, and long-lasting stable photocatalysts remains extremely urgent. In this study, a NiS-Mn 2 SnS 4 /g-C 3 N 4 composite with efficient photocatalytic hydrogen evolution performance is synthesized via a simple physical mixing method and calcination process. The introduction of NiS and Mn 2 SnS 4 significantly increases the specific surface area of the g-C 3 N 4 composite, and a dual Type-II heterojunction capable of efficiently separating electron-hole pairs is formed between the components and g-C 3 N 4 . Under 300 W xenon lamp irradiation, the NiS-Mn 2 SnS 4 /g-C 3 N 4 composite achieves a hydrogen evolution rate of 7672.45 μmol·g −1 ·h −1 , corresponding to 3.76, 59.74, and 254.64 times enhancements compared to bare g-C 3 N 4 , NiS, and Mn 2 SnS 4 , respectively. After four cycles, the hydrogen production of NiS-Mn 2 SnS 4 /g-C 3 N 4 still reaches 91 % of the rate in the first cycle. Photoelectrochemical property characterization demonstrates that the composite samples can generate more active sites, reduce the overpotential for H 2 evolution, and enhance light absorption efficiency. Combined with density functional theory (DFT) calculations and band structure analysis, it is confirmed that a strong electronic coupling effect exists among NiS, Mn 2 SnS 4 , and g-C 3 N 4 , and the electron transfer follows a Type-II pathway. This study provides important references and insights for constructing high-activity and high-specific-surface-area g-C 3 N 4 -based photocatalysts.
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产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Qin Hu,Shengtao Zhang,Feng Chen,Wenpo Li,Hao Jiangyu,Xinyue Liang,Bin Xiang,Chao Chen,Xuefeng Zou
Nickel sulfide possesses ultra-high theoretical energy storage capacity. Though it is easily obtained, it is very difficult to exert its intrinsic strong capacity. In this work, a new strategy based on a binary synergy of sulfur sources is introduced. By regulating the molar ratio of two sulfur sources, a high-performance α-NiS/Ni 3 S 4 binary hybrid is successfully synthesized. Interestingly, it is found that changing the molar ratio of two sulfur sources in hydrothermal process can efficiently regulate the components of product but cannot visibly affect its morphology. The electrochemical results indicate that this strategy is highly effective for improving the performance of nickel sulfide. As a result, a highest specific capacity of 214.9 mAh g −1 at 2 A g −1 was reached. In addition, the fabricated S3//rGO hybrid supercapacitor displays a highest energy density of 41.9 Wh kg −1 at a power density of 799.0 kW kg −1 . Moreover, the device delivers an excellent cycle stability with 103% capacity retention rate after 10,000 cycles. These findings open a new avenue for the controlled synthesis of high-performance nickel sulfides or other metal sulfides.
研究领域:
材料科学
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电化学
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纳米技术
·
储能
✓ 已验证
DOI
高影响因子
Small
·
2023
·Vol. 19
·期 39
·2302330
·
IF 13.3
Rui Du,Chuantao Wang,Li Guo,Razium Ali Soomro,Bin Xu,Chunming Yang,Feng Fu,Danjun Wang
Selective oxidation of biomass-based molecules to high-value chemicals in conjunction with hydrogen evolution reaction (HER) is an innovative photocatalysis strategy. The key challenge is to design bifunctional photocatalysts with suitable band structures, which can achieve highly efficient generation of high-value chemicals and hydrogen. Herein, NiS/Cd 0.6 Zn 0.4 S Schottky junction bifunctional catalysts are constructed for sunlight-driven catalytic vanillyl alcohol (VAL) selective oxidation towards vanillin (VN) coupling HER. At optimal conditions, the 8% NiS/Cd 0.6 Zn 0.4 S photocatalyst achieves high activity of VN production (3.75 mmol g −1 h −1 ) and HER (3.84 mmol g −1 h −1 ). It also exhibits remarkable VAL conversion (66.9%), VN yield (52.1%), and selectivity (77.8%). The photocatalytic oxidation of VAL proceeds a carbon-centered radical mechanism via the cleavage of α C–H bond. Experimental results and theoretical calculations show that NiS with metallic properties enhances the electron transfer capability. Importantly, a Ni-S-Cd “electron bridge” formed at the interface of NiS/Cd 0.6 Zn 0.4 S further improves the separation/transfer of electrone/h + pairs and also furnishes HER active sites due to its smaller the |ΔG H* | value, thereby resulting in a remarkably HER activity. This work sheds new light on the selective catalytic oxidation VAL to VN coupling HER, with a new pathway towards achieving its efficient HER efficiency.
研究领域:
材料科学
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催化化学
·
太阳能利用
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Applied Materials Today
·
2023
·
IF 8.3
Guiyang Yu,Ke Gong,Lan Hu,Chuanwang Xing,Yujia Hu,Debao Wang,Xiyou Li
The development of mild and environmental method for direct transformation of aromatic alcohol into hydrobenzoin via controlled C‒C coupling is a highly attractive but challenging goal. In this paper, a P-doped g-C 3 N 4 photocatalyst with NiS nanoparticles modification is first reported to apply the visible-light-driven C‒C coupling of aromatic alcohol into hydrobenzoin, as well as integrating with the production of clean H 2 fuel. The synergistic effect of doped P atoms and formed type-II heterojunction between PCN and NiS improves the light absorption ability of g-C 3 N 4 and greatly suppresses the charge recombination. Optimized 2.0% NiS/PCN composite achieves the complete conversion of aromatic alcohol within 6 h reaction time, as far as we known, which is the highest efficiency so far for aromatic alcohol conversion via photocatalytic strategy. Hydrobenzoin is controllably formed with 68% selectivity, together with a highly-efficient H 2 production rate of 994.8 μmol·g −1 ·h −1 . In-situ EPR studies reveal a preferential activation of C‒H bond than O‒H bond in aromatic alcohol by photoexcited holes, forming C 6 H 5 ĊH 2 OH radicals for subsequent coupling. The residual protons interact with photoexcited electrons to generate H 2 . Our study not only offers an efficient g-C 3 N 4 -based photocatalyst for the synthesis of hydrobenzoin under mild conditions, but also opens up a new avenue for manipulating the activation of C‒H or O‒H bonds for high selectivity of hydrobenzoin product.
研究领域:
化学
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材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2025
·
IF 21.1
Xiaofan Liu,Lina Kong,Jianping Xu,Ziyu Lin,Danhao Xu,Jiawei Sun,Shaobo Shi,Xiaosong Zhang,Lan Li
Photothermal catalysis (PTC) water splitting outperforms traditional photocatalysis, but understanding of the photothermal/photochemical coupling mechanism is limited, hindering improvements in solar energy conversion efficiency. We grafted NiS ultrafine nanoparticles on hydrothermal-prepared ZnIn 2 S 4 nanosheet film via a photo-deposition process. Metallic NiS acts as photothermal/photochemical active sites and enhances solar light absorption and carrier separation of ZnIn 2 S 4 , achieving 41.14% photothermal conversion efficiency. The NiS/ZnIn 2 S 4 film exhibits a high and stable PTC H 2 production rate of 31.19 mmol·m -2 ·h -1 , which was 7.1 and 3.8 times higher than that of the pristine ZnIn 2 S 4 and the Pt/ZnIn 2 S 4 film with the same cocatalyst content, respectively. Photothermal, PTC, photoelectrical testing and DFT calculations demonstrate that the photothermal effect and synergistic photothermal/photochemical coupling contribute to the high PTC performance of NiS/ZnIn 2 S 4 . Thermodynamically, the increased temperature of NiS/ZnIn 2 S 4 enhances carrier generation and reduces Gibbs free energy (ΔG H ) for H 2 adsorption/desorption. Kinetically, temperature gradients at macro and micro levels enhance H 2 diffusion and electron convergence near NiS. This investigation of photothermal catalysis synergy provides promising strategy for designing efficient solar-to-hydrogen energy conversion systems.
研究领域:
材料科学
·
能量转换
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光催化
·
纳米技术
·
可再生能源
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产品关联
DOI
高影响因子
MICROCHIMICA ACTA
·
2015
·Vol. 182
·期 13
·2277-2283
·
IF 3.741
Wang Yong,Qu Jianhang,Li Shufang,Dong Ying,Qu Jianying
We describe an electrochemical sensor for simultaneous determination of hydroquinone (HQ) and catechol (CC). A glassy carbon electrode (GCE) was modified with gold nanoparticles, L-cysteine, and ZnS/NiS@ZnS quantum dots using a layer-by-layer technique. The materials were characterized by X-ray diffractometry, field emission scanning electron microscopy, and electrochemical impedance and Fourier transform infrared spectroscopy. Cyclic voltammetry and differential pulse voltammetry revealed this modified GCE to represent a highly sensitive sensor for the simultaneous determination of HQ and CC. The anodic peak current for HQ at a working voltage of 80 mV (vs. Ag/AgCl) is related to its concentration in the 0.1 to 300 μM range (even in the presence of 0.1 mM of CC). The anodic peak current for CC at a working voltage of 184 mV is related to its concentration in the 0.5 to 400 μM range (even in the presence of 0.1 mM of HQ). The detection limits (at an S/N ratio of 3) are 24 and 71 nM for HQ and CC, respectively. The modified GCE was successfully applied to the determination of HQ and CC in aqueous solutions and gave satisfactory results.
A glassy carbon electrode was modified with gold nanoparticles, ZnS/NiS@ZnS quantum dots and L-cysteine and used for simultaneous determination of hydroquinone and catechol.
研究领域:
分析化学
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环境科学
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材料科学
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产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2023
·
IF 22.1
Lei Guo,Jing Xie,Shiyi Chen,Zexing He,Yuezheng Liu,Chengxiang Shi,Ruijie Gao,Lun Pan,Zhen-Feng Huang,Xiangwen Zhang,Ji-Jun Zou
Developing affordable and efficient electrocatalysts toward water electrolysis under industrial conditions is crucial for large-scale production of green hydrogen. In this regard, we propose a facile and mild method to construct crystalline-amorphous composites of metal phosphate (MPi) and NiS on nickel foam (NF) for practical water electrolysis. The as-prepared electrodes exhibit excellent performance, achieving a remarkable current density of 1000 mA cm –2 at the ultralow overpotential of 345 and 223 mV for FePi-NiS/NF (oxygen evolution reaction, OER) and NiCoPi-NiS/NF (hydrogen evolution reaction, HER), respectively. The composites can undergo an in-situ transformation into highly active and targeted species under high current density, which possess a unique pore structure interconnected by nanosheets that provides an abundance of catalytic sites and open channels for efficient bubble diffusion. When operated under industrial conditions (6 M KOH, 70 °C), the assembled electrode requires only 1.712 V to attain a current density of 1000 mA cm −2 . The electrodes also demonstrate exceptional performance in alkaline electrolysis with an anion exchange membrane (AEMWE) when scaled up to a larger size (area: ≈ 25 cm 2 ). Specifically, they achieve a substantial current of 12.5 A at 1.87 V with a high energy efficiency of 79.2 % and remarkable durability over 30 h under industrial electrolysis conditions (1 M KOH, 50 °C), outperforming benchmark Pt/C/NF || IrO 2 /NF electrodes with energy saving of 0.215 kWh Nm –3 . This work provides a cost-effective and efficient strategy for designing and constructing stable and active catalysts for water electrolysis under harsh industrial conditions.
研究领域:
材料科学
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电化学
·
能源工程
·
催化
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Katam Srinivas,Yuanfu Chen,Bin Wang,Bo Yu,Xinqiang Wang,Yang Hu,Yingjiong Lu,Wenxin Li,Wanli Zhang,Dongxu Yang
Because of the sluggish oxygen evolution kinetics, it is extremely important but still challenging to develop low-cost, efficient, and stable electrocatalysts for oxygen evolution reaction (OER) to enhance the efficiency of water electrolysis. Herein, for the first time, we present a novel heterostructure catalyst, constructed by ultrafine NiS/Fe3O4 heterostructural nanoparticles decorated on a carbon nanotube (CNT) matrix (NiS/Fe3O4 HNPs@CNT), which is synthesized by a facile hydrothermal reaction and subsequent sulfurization process. The NiS/Fe3O4 HNPs@CNT hybrid delivers superior OER activity in alkaline medium: it delivers a current density of 10 mA cm–2 at an ultralow overpotential of 243 mV with a small Tafel slope of 44.2 mV dec–1, which outperforms the benchmark RuO2 electrocatalyst; moreover, it exhibits terrific long-term stability over 36 h without any noticeable performance decay. The exceptional OER performance can be attributed to the unique nanoarchitecture, high conductivity of the CNT matrix, and particularly, the interaction between the Ni and Fe species in NiS/Fe3O4 heterostructural nanoparticles. This work introduces a sensible nanoarchitecture design with a facile and novel fabrication strategy to attain nonprecious metal-based composite catalysts with high OER performance and outstanding long-term stability.
研究领域:
材料科学
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电化学
·
纳米技术
·
催化
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Yutong Luo,Jiaheng Qin,Guangxue Yang,Sha Luo,Ziming Zhao,Ming Chen,Jiantai Ma
The rational design and fabrication of distinctive coordination sites is an attractive and challenging approach to develop electrocatalysts with superior activity toward oxygen evolution reaction (OER). Constructing N-doped carbon shells coordinated with transitional metal composites can greatly enhance the OER activity of electrocatalysts. Herein, a facile electrochemical-pyrolysis strategy is applied to synthesize NiS/C 3 N 4 composite with N-Ni-S coordination sites by in-situ crystallization on copper foam (CF). A detailed characterization, especially synchrotron-based X-ray absorption fine structure (XAFS) clearly unravels the N-Ni-S coordination mode is successfully formed. As a result, NiS/C 3 N 4 presents excellent OER performance with a low overpotential of 334 mV at a current density of 10 mA cm −2 , a Tafel slope of 45 mV dec −1 , and robust electrochemical stability for 50 h in basic media, outperforming some recently reported conventional transitional metal electrocatalysts. The outstanding electrocatalytic performance of NiS/C 3 N 4 mainly originates from the N-Ni-S coordination sites, which can provide abundant catalytic active sites, facilitate charge transfer, and enhance electronic conductivity. Furthermore, by tuning the two important experimental parameters of electrodeposition potential and electropolymerization time, the relationship between morphology and electrocatalytic performance of catalysts is deeply explored. This work demonstrates the validity of improving electrocatalytic performance by elaborately tailoring the coordination sites, thereby opening up an applicable and inspiring avenue forward in the design of advanced electrocatalysts for water splitting.
研究领域:
电化学
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材料科学
·
催化
·
能源材料
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）