ADVANCED POWDER TECHNOLOGY
·
2023
·
IF 5.2
Yuan Zhang,Juanjian Ru,Ping Huang,Yan Jiang,Enhui Wu
Ni 3 S 4 /NiS 2 composite powder with controllable morphology and proportion is synthesized without using any surfactant in choline chloride-ethylene glycol (ChCl-EG) deep eutectic solvent (DES) at 120 °C. The products are characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM) to reveal the effects of reaction time, and reactant concentration on their composition and structure. The reaction mechanism for synthesizing Ni 3 S 4 /NiS 2 in ChCl-EG DES is also elaborated. The results show that different proportions of wrinkled, lamellar and layer-rolled Ni 3 S 4 /NiS 2 can be obtained by controlling the concentration of NiCl 2 ·6H 2 O and Na 2 S 2 O 3 ·5H 2 O. The analysis found that the reaction mechanism of Ni 3 S 4 /NiS 2 is Ni(II) reacting with S 2 O 3 2− and H 2 O to form Ni 3 S 4 , NiS 2 , SO 4 2− , and H + . The NMR hydrogen spectrum ( 1 H NMR), NMR carbon spectrum ( 13 C NMR) and FT-IR tests of ChCl-EG indicate that it is structurally stable, and acted as a solvent and template during the reaction process.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Yaqiong Gong,Yu Lin,Zhi Yang,Feixiang Jiao,Jinhui Li,Wenfei Wang
The investigation of earth-abundant, durable, and efficient bifunctional electrocatalysts for overall water splitting was critical to future renewable energy systems. Herein, flower-like Mn-doped Cu 7.2 S 4 @NiS 2 @NiS was successfully assembled on 3D nickel foam (NF) substrate via a facile two-step hydrothermal‑sulfuration method (denote as flower-like Mn 2 -CNN/NF). Benefited from unique 3D configuration with firm contact between nanoflowers and Ni foam, flower-like Mn 2 -CNN/NF electrode demonstrated a low overpotential of 252 mV to achieve a current density of 50 mA cm −2 and 24 h-long stability toward oxygen evolution reaction (OER) in 1 M KOH. For hydrogen evolution reaction (HER), a stable current density of 10 mA cm −2 at only an overpotential of 87 mV and a low Tafel slope of 43.7 mV dec −1 were observed. Furthermore, when assembled as electrolyzers on both cathode and anode for stable water splitting, a low cell voltage of 1.514 V was needed for flower-like Mn 2 -CNN/NF to afford the current density of 10 mA cm −2 and distinguished durability for over 46 h was observed, which presented a wide range of possibilities for the development of earth-abundant and high efficient electrode pairs.
研究领域:
材料科学
·
可再生能源
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Weiliang Zhou,Xiaojie Li,Xuan Li,Jiaxin Shao,Hengpan Yang,Xiaoyan Chai,Qi Hu,Chuanxin He
The rational design of bifunctional electrocatalysts is essential to achieve efficient hydrogen production from water splitting. Here, inspired by cocatalysts widely utilized in photocatalysis , we designed a heterostructure comprising amorphous VO 2 and crystalline NiS 2 , aiming at using VO 2 cocatalyst to boost activity of NiS 2 for both the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). Intriguingly, we found that VO 2 displayed different co-catalytic function in boosting the OER and HER. Specifically, the VO 2 optimized the binding energy of hydrogen intermediate on NiS 2 and thus improved the HER activity. As for the OER, the amorphous VO 2 was easily dissolved in the KOH electrolyte, resulting in the generation of abundant oxygen vacancies in the in-situ generated active phase of NiOOH from NiS 2 , thereby drastically enhancing the OER activity. Consequently, the obtained VO 2 –NiS 2 @CC displayed excellent performance for overall water splitting, with a low voltage of 1.53 V at 10 mA cm −2 .
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Guang-Lan Li,Ying-Ying Miao,Xiang-Yue Qiao,Tian-Yu Wang,Fei Deng
Boosting the hydrogen and oxygen evolution reaction (HER/OER) on MoS 2 -based catalysts is a challenging scientific issue due to the activity of MoS 2 is significantly rely on the edge site which is limited in regular structure. Herein, a highly dispersed edge site-rich NiS 2 /MoS 2 /CNTs heterojunction catalyst is successfully developed via facile etching the nanoflower-like NiS 2 /MoS 2 spheres on carbon nanotubes (CNTs). Through expanding the lattice spacing of 2H-MoS 2 , generating abundant Mo-S edge sites ( i.e . generating a large number of unsaturated S atoms) together with enhancing the dispersity of NiS 2 /MoS 2 nanosheets, the etching posttreatment significantly regulates the electronic and geometric structure of NiS 2 /MoS 2 /CNTs. Further combining the extremely intimate electronic interaction between MoS 2 /NiS 2 heterogeneous interfaces, the optimal NiS 2 /MoS 2 /CNTs presents a preeminent alkali water splitting performance with overpotentials of 149 for HER and 315 mV for OER at 10 mA cm −2 , which are 29 and 35 mV lower than the catalyst before etch treatment (NiS 2 /MoS 2 /CNTs-p), respectively. Moreover, the electrolyzer assembled with NiS 2 /MoS 2 /CNTs drives a voltage of 1.73 V at 10 mA cm −2 and a continuous stable operation of 50 h toward overall water splitting.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Water Process Engineering
·
2024
·
IF 6.3
Yuan Zhang,Juanjian Ru,Ping Huang,Enhui Wu
NiS 2 is synthesized in a single step at atmospheric pressure using different nickel salts (NiSO 4 ·6H 2 O, NiCl 2 ·6H 2 O, and Ni (CH 3 COO) 2 ·4H 2 O) in choline chloride-ethylene glycol deep eutectic solvent (ChCl-EG DES). The effects of nickel salt types and reactant concentration ratios on the phase and morphology of the products are investigated. Results show that NiS 2 can be obtained when 0.1 M Ni (CH 3 COO) 2 ·4H 2 O and 0.2 M S 0 are used, while impurity S is also found in products when NiCl 2 ·6H 2 O is used. The synthesis mechanism of NiS 2 is proposed through the investigation of the SO 4 2− concentration, pH of the reaction system, and structure of the ChCl-EG DES. DES acts as a reaction solvent and structure-directing agent. The synthesized NiS 2 is used as an adsorbent to remove rhodamine B (RhB) from wastewater. The analysis indicates that the adsorption behavior aligns well with the pseudo-second-order kinetic model and the Freundlich isotherm model. The zeta potential and Fourier-transform infrared spectra of NiS 2 with adsorbed RhB show that the adsorption process is based on electrostatic interaction.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2018
·
IF 5.091
Haitao Li,Ming Wang,Yiping Wei,Fei Long
A series of noble-metal-free NiS 2 -loaded g-C 3 N 4 hybrid composites were prepared via simple hydrothermal method. Benefited from the wider spectral response range and the effective separation of photoelectron-holes of g-C 3 N 4 -NiS 2 heterojunction catalysts, as well as the rich unsaturated active S atoms on the NiS 2 with S 2 2− , the composite catalysts has prominent photocatalytic performance for H 2 evolution. Remarkably, the optimal composite photocatalysts achieved an average hydrogen production rate as high as 715.83 μmol/h/g in 3 h under visible-light irradiation, which is 2.75 times as high as that of precious metal Pt (259.5 μmol/h/g) as a co-catalyst. Besides, the composite catalyst still shows prominent photocatalytic performance for H 2 evolution after three continuous photocatalytic reaction cycles for 9 h. This study provided a facile method to build a low-cost but effective metal sulfide co-catalyst for hydrogen production under visible light irradiation.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Bo Yuan,Jianxun Zhao,Wanqiang Liu,Heng Liu,Peng Chen,Lianshan Sun,Xin Guo,Xinwei Wang,Weixuan Zhang,Rui Zhang,Fang Wang
The introduction of heterostructure in the cathode material of Li-S battery is an effective method to improve the redox reaction kinetics and suppress the shuttle effect of polysulfide . A metal sulfide/metal selenide (NiS 2 /NiSe 2 ) heterostructure with hollow tetrahedral structure is prepared as a sulfur host of lithium-sulfur batteries. The prepared NiS 2 /NiSe 2 heterostructure exhibits efficient charge transfer at the heterojunction interface, thereby enhancing catalytic activity for redox reactions of polysulfides and facilitating their rapid conversion. Moreover, the unique hollow tetrahedral structure, along with abundant surface pores, enables high sulfur loading capacity, providing abundant electrochemical reaction sites to enhance sulfur utilization efficiency. The results demonstrate that the NiS 2 /NiSe 2 heterostructure material exhibits a remarkable initial capacity of 1338.9 mAh/g at 0.2 C, along with exceptional cycling stability (maintaining a capacity of 517.6 mAh/g after 200 cycles at 0.2 C, with only a negligible decay rate of 0.3% per cycle, retaining a capacity of 462.6 mAh/g after 500 cycles at 1 C, with an insignificant decay rate of merely 0.12% per cycle). The facile preparation of this NiS 2 /NiSe 2 heterostructure not only enables the realization of lithium-sulfur batteries with exceptional capacity, but also opens up broader avenues for exploring high-performance heterogeneous materials .
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2023
·Vol. 10
·期 8
·2370-2379
·
IF 7
Yanli Ruan,Hang Xu,Haikuo Lei,Wenjuan Xue,Tianyu Wang,Shidong Song,Yangyang Yu,Gui-Rong Zhang,Donghai Mei
Zn–air batteries (ZABs) have been widely studied due to their high theoretical energy density, low cost, and high safety. However, the lack of efficient bifunctional electrocatalysts toward both the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) hinders their large-scale application. Herein, a dendritic NiS2@Co–N–C/CNF nanoarchitecture is proposed, which was fabricated by high-temperature carbonization of Co-MOFs and a subsequent simple hydrothermal composite method using NiS2 nanosheets. The catalyst is reasonably designed to integrate the oxygen reduction reaction (ORR)/oxygen evolution reaction (OER) active sites on the surface of carbon nanofibers. Through the synergy between NiS2 and Co–N–C/CNF and the unique branch–leaf porous structure, the catalyst showed excellent catalytic activity and stability. In an alkaline electrolyte, the OER overpotential of NiS2@Co–N–C/CNF is 300 mV at 10 mA cm−2. The ORR half-wave potential (E1/2) of NiS2@Co–N–C/CNF is 0.8 V. In addition, the superior catalytic activity of NiS2@Co–N–C/CNF could be transferred to a ZAB, which exhibits a maximum peak power density of 181 mW cm−2 along with an ultra-long cycling stability for 1050 and 600 h at discharging current densities of 5 and 10 mA cm−2, respectively. The performance is significantly higher than that of commercial precious metal Pt/C + IrO2 mixed catalysts. The peak power density of solid state ZAB (SSZAB) integrated with NiS2@Co–N–C/CNF is 76 mW cm−2, and it can still maintain excellent cycling stability under different bending states. More impressively, four in-series SSZABs (NiS2@Co–N–C/CNFs) can charge smartphones, indicating their potential feasibility in the field of wearable electronics.
研究领域:
材料科学
·
电化学
·
能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry B
·
2018
·Vol. 7
·期 1
·143-149
·
IF 4.776
Gang He,Yan Ma,Hu Zhou,Siyuan Sun,Xianwen Wang,Haisheng Qian,Yan Xu,Zhaohua Miao,Zhengbao Zha
To overcome the unfavorable effects of the hydrophobicity of drugs and cancer resistance, mesoporous NiS2 nanospheres (mNiS2 NSs) have been successfully developed here to package hydrophobic camptothecin (CPT) and realize the synergistic photothermal–chemotherapy of cancer. The mNiS2 NSs which were prepared through a facile solvothermal method here exhibited not only considerable near-infrared (NIR) absorption and good photothermal conversion efficiency as high as 44.6%, but also achieved a NIR light induced CPT release property which were both beneficial for improving the cancer cell-killing efficacy. After a short period of NIR light illumination, a significant intensified cell killing efficacy was observed when 4T1 or HepG2 cancer cells were incubated with CPT@mNiS2 NSs. Thus, mNiS2 NSs have been demonstrated here to have potential as a novel NIR light-responsive hydrophobic drug delivery nanoplatform for realizing synergistic cancer treatment.
研究领域:
肿瘤学
·
纳米医学
·
生物材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Fushan Wen,Le Pang,Tao Zhang,Xiaoli Huang,Yuan Xu,Yajie Li
The exploitation of the superior oxygen evolution reaction (OER) electrocatalysts is of great paramount importance to the investigation of developing hydrogen production from water splitting to alleviate the energy crisis. Herein, Fe 3+ ion doped NiS 2 for OER electrocatalysts obtained from a metal-organic framework (MOF) as a self-template, with the graphitic phase carbon nitride (g-C 3 N 4 ) as a chain armor, was prepared by the two-step solvothermal-pyrolysis method. The MOF-derived Fe–NiS 2 @g-C 3 N 4 composite achieves a current density of 10 mA cm −2 at a tiny OER overpotential (280 mV) and shows good stability in duration tests over 60 h. Compared with the undoped sample, the overpotential is significantly lower by 60 mV and the stability is substantially improved. In this study, two strategies, iron ion doping and g-C 3 N 4 coating, were implemented to target the defects of NiS 2 , promoting its catalytic activity and achieving a significant improvement in stability at the cost of a bit of activity. Balancing activity and stability maximized has been achieved by our work. This study presents a potential approach to improve the catalyst activity and stability in an integrated strategy.
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
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2020
·Vol. 44
·期 6
·4827-4836
·
IF 3.741
Mojie Sun,Zhao Wang,Bixue Gao,Shijie Wang,Chi Wang,Xiaochen Song,Dongyao Lin
Summary To circumvent the expensive cost of precious metal electrocatalysts, a hydrothermal method and a plasma-enhanced chemical vapor deposition (PECVD) method have been used to prepareNiS 2 -Ni(OH) 2 /NF-PECVD (N-PECVD) with excellent properties. After XRD, SEM, XPS, and other characterization methods, it can be seen that after the hydrothermal reaction of Ni foam (NF), 50-60 nm Ni(OH) 2 nanosheets have grown on the NF frame. The subsequent PECVD reaction produces 90 nm NiS 2 -Ni(OH) 2 nanosheets on the NF frame. The hydrogen release overpotentials in the acidic solution and alkaline solution are 90 and 95 mV ( j = 10 mA/cm 2 ), respectively. And the Tafel slopes reach 80 and 83.6 mV/dec, respectively. The chronopotential (CP) test shows that the material has good HER stability over 12 h. The results from the subsequent electric double layer capacitance and alternating current impedance (EIS) tests show that N-PECVD synthesized by PECVD has a relatively large active electrochemical surface area (ECSA) and a low electrochemical impedance. This study not only finds good inspiration for the synthesis of cheap HER catalysts but also provides a valuable reference for the synthesis of materials in other fields.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CATALYSIS LETTERS
·
2019
·Vol. 149
·期 5
·1197-1210
·
IF 2.372
Wang Lina,Guo Tong,Sun Sen,Wang Yan,Chen Xiaoling,Zhang Kangning,Zhang Dongxia,Xue Zhonghua,Zhou Xibin
Abstract The electrocatalytic activity of transition metal dichalcogenides (TMDs) is largely dependent on the exposed massive active sites and electrical conductivity of the catalysts. In this work, a tree-like nanocomposite (NiS 2 /MoS 2 -RGO) which is composed of bimetal sulfide (NiS 2 /MoS 2 ) nanocomposites uniformly anchored on the surface of reduced graphene oxide (RGO) was successfully synthesized. As a catalytic material for the hydrogen evolution reaction (HER), the NiS 2 /MoS 2 -RGO composites exhibit significantly enhanced electrocatalytic activity and impressive long-term stability for the hydrogen evolution reaction over a wide pH range. The tree-like NiS 2 /MoS 2 -RGO nanocomposites afford a current density (η 10 ) of 10 mA/cm 2 at small overpotentials of 172, 144 and 229 mV, and have a small Tafel slope of 51, 82 and 103 mV/dec in acidic, alkaline and neutral solution, respectively. Further studies reveal that the effective activities benefit from the abundant active edge sites and defects of NiS 2 /MoS 2 nanocomposites and the excellent conductivity of RGO. Graphical Abstract
研究领域:
材料科学
·
电化学
✓ 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）