Pigment & Resin Technology
·
2022
·Vol. 53
·期 3
·358-368
·
IF 1.126
Xiaoping Lin,Xiaoyan Li,Jiming Yao,Xianghong Li,Jianlin Xu
Purpose To develop electrode materials for supercapacitor with superior electrochemical performance and simple preparation process, the purpose of this study is to prepare flexible CC/NiS/a-NiS electrodes with self-supporting structure by loading hydrothermally synthesized a-NiS particles along with nano-NiS on carbon cloth by electroplating method. Design/methodology/approach The effects of current densities, temperatures and pH values on the loading amount and uniformity of the active substances during the plating process were investigated on the basis of optimization of surface morphology, crystalline structure and electrochemical evaluation as the cyclic voltammetry curves, constant current charge–discharge curves and AC impedance. Findings The a-NiS particles on CC/NiS/a-NiS were mostly covered by the plated nano-NiS, which behaved as a bulge and provided a larger specific surface area. The CC/NiS/a-NiS electrode prepared with the optimized parameter exhibited a specific capacitance of 115.13 F/g at a current density of 1 A/g and a Coulomb efficiency of 84% at 5 A/g, which is superior to that of CC/NiS electrode prepared by electroplating at a current density of 10 mA/cm 2 , a temperature of 55°C and a pH of 4, demonstrating its fast charge response of the electrode and potential application in wearable electronics. Originality/value This study provides an integrated solution for the development of specifically structured NiS-based electrode for supercapacitor with simple process, low cost and high electrochemical charge/discharge performance, and the simple and easy-to-use method is also applicable to other electrochemically active composites.
研究领域:
材料科学
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电化学
·
储能
·
纳米技术
✓ 已验证
DOI
高影响因子
OPTICAL MATERIALS
·
2021
·
IF 3.08
Xue Li,Li-Juan Jian,Li Wang,Rong-Han Liu,Yun Zhao,Jiang-Tao Chen,Yan Li
Strategy of designing new-structured semiconductor photocatalysts with great electron-hole pairs separation is meaningful for improving the photocatalytic pollution abatement. Herein, on the basis of decahedral BiVO 4 with largely exposed (040) crystal facet, p-n hetero-nanostructured NiS@(040)-BiVO 4 catalysts with various molar ratio of NiS were fabricated by a facile two-step hydrothermal method to study the photo-degradation activities under visible-light irradiation. To photo-degrade anion methyl orange (MO), cation rhodamine B (RhB) and tetracyclines (TC), such nanostructures can all exhibit excellent photocatalytic activities . Compared with pure (040)-BiVO 4 and NiS nanoparticles , 0.6 M ratio of NiS@(040)-BiVO 4 possesses 8.6, 8.9 and 6.5 times higher photocatalytic capacity (MO: 98.6%, RhB: 99.1%, TC: 98.4%) and 49.2, 64.2 and 27.7 times faster photocatalytic rate (MO: 8.4060 h −1 , RhB: 8.2854 h −1 , TC: 7.6230 h −1 ). Detailed analyses show the superior light-harvesting, higher photocurrent response, excellent charge separation and improved charge transport properties are the main factors resulting the high efficient photocatalytic performance of NiS@(040)-BiVO 4 nanostructures. Besides, the forming of facet isotype heterojunctions between (040) and (220) lattice planes in BiVO 4 can also help to get more active photo-induced electrons for photocatalysis .
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Science Bulletin
·
2019
·
IF 6.277
Xiang Gao,Li An,Dan Qu,Wenshuai Jiang,Yanxiao Chai,Shaorui Sun,Xingyuan Liu,Zaicheng Sun
Photocatalytic N 2 fixation involves a nitrogen reduction reaction on the surface of the photocatalyst to convert N 2 into ammonia. Currently, the adsorption of N 2 is the limiting step for the N 2 reduction reaction on the surface of the catalyst. Based on the concept of photocatalytic water splitting, the photocatalytic efficiency can be greatly enhanced by introducing a co-catalyst. In this report, we proposed a new strategy, namely, the loading of a NiS co-catalyst on CdS nanorods for photocatalytic N 2 fixation. Theoretical calculation results indicated that N 2 was effectively adsorbed onto the NiS/CdS surface. Temperature programmed desorption studies confirmed that the N 2 molecules preferred to adsorb onto the NiS/CdS surface. Linear sweep voltammetry results revealed that the overpotential of the N 2 reduction reaction was reduced by loading NiS. Furthermore, transient photocurrent and electrochemical impedance spectroscopy indicated that the charge separation was enhanced by introducing NiS. Photocatalytic N 2 fixation was carried out in the presence of the catalyst dispersed in water without any sacrificial agent . As a result, 1.0 wt% NiS/CdS achieved an ammonia production rate of 2.8 and 1.7 mg L −1 for the first hour under full spectrum and visible light ( λ > 420 nm), respectively. The catalyst demonstrated apparent quantum efficiencies of 0.76%, 0.39% and 0.09% at 420, 475 and 520 nm, respectively. This study provides a new method to promote the photocatalytic efficiency of N 2 fixation.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2019
·
IF 6.361
Houde She,Man Jiang,Pengfei Yue,Jingwei Huang,Lei Wang,Jianzhang Li,Gangqiang Zhu,Qizhao Wang
The performance of BiVO 4 for photoelectrocatalytic (PEC) water decomposition is commonly limited by reaction kinetics. In this work, NiS and CoS nanospheres were respectively loaded on BiVO 4 thin films (NiS/BiVO 4 and CoS/BiVO 4 composites) to improve its reaction kinetics for PEC water decomposition. Both physical and chemical properties of these composites were characterized by XRD , SEM, TEM, PL and UV-DRS. The photoelectric properties of the samples were verified by testing LSV , i-t, EIS and IPCE. The formation of the composites can effectively prevent the recombination of carriers and consequently accelerate the separation of electrons and holes. NiS/BiVO 4 and CoS/BiVO 4 can reach photocurrent of 2.1 mA cm −2 and 2.7 mA cm −2 under light respectively, at 1.23 V vs. RHE, which are 1.75 times and 2.25 times that of BiVO 4 (1.2 mA cm −2 ). The hydrogen production of the NiS/BiVO 4 and CoS/BiVO 4 photoanodes was 4.7 and 7.3 times higher than that of BiVO 4 photoanode, respectively.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MOLECULES
·
2023
·Vol. 28
·期 12
·4571
·
IF 4.6
Peizhi Fan,Jie Wang,Wenfei Ding,Lan Xu
The combination of multiple electrode materials and their reasonable structural design are conducive to the preparation of composite electrodes with excellent performance. In this study, based on carbon nanofibers grown with Ni(OH)2and NiO (CHO) prepared by electrospinning, hydrothermal growth, and low-temperature carbonization, five transition metal sulfides (MnS, CoS, FeS, CuS, and NiS) were hydrothermally grown on their surfaces, exhibiting that CHO/NiS had the optimal electrochemical properties. Subsequently, the effect of hydrothermal growth time on CHO/NiS revealed that the electrochemical performance of CHO/NiS-3h was optimal, with a specific capacitance of up to 1717 F g−1(1 A g−1), due to its multistage core–shell structure. Moreover, the diffusion-controlled process of CHO/NiS-3h dominated its charge energy storage mechanism. Finally, the asymmetric supercapacitor assembled with CHO/NiS-3h as the positive electrode demonstrated an energy density of 27.76 Wh kg−1at a maximum power density of 4000 W kg−1, and it still maintained a power density of 800 W kg−1at a maximum energy density of 37.97 Wh kg−1, exhibiting the potential application of multistage core–shell composite materials in high-performance supercapacitors.Keywords:electrospinning;NiS;hydrothermal process;specific capacitance;asymmetric supercapacitor
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
DALTON TRANSACTIONS
·
2023
·
IF 4
Shuang Wang,Mengjie Yao,Yuye Cheng,Kai Ding,Minghao Dou,Hongyu Shao,Shuaitong Xue,Shenjie Li,Yanyan Chen
By providing the spatial separation of the active sites and retaining high oxidative and reducing capacity, the direct Z-scheme heterostructure is considered the most potential structure for yielding photo-electric response. However, challenges still exist in the directional transfer of charge carriers between two semiconductors in direct Z-scheme structures. In this regard, by constructing the Vzn defect and p–n junction, a direct Z-scheme ZnxCd1−xS@ZnS-NiS heterostructure was obtained for the regulated electronic structure, which ensured high-yield hydrogen properties. The Zn vacancy in the partially-coated ZnS shell led to the Vzn energy level, and the addition of NiS led to the p–n structure, which caused a drastic downshift of the band edge potentials in comparison to that of pristine CdS. This variation gave rise to a staggered band edge alignment between ZnxCd1−xS and NiS, resulting in the variation of charge transfer kinetics from type-I to direct Z-scheme. Through careful characterization, it was found that the optimal photocatalytic hydrogen precipitation activity reached 16 683.6 μmol g−1 h−1, which was 70 times that of CdS, and this improvement was considered to form a spatial barrier, providing a clear direction and path for carrier transmission.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RENEWABLE ENERGY
·
2020
·
IF 6.274
Heqing Zhang,Zebin Yu,Ronghua Jiang,Yanping Hou,Jun Huang,Hongxiang Zhu,Fei Yang,Mingjie Li,Fengyuan Li,Qi Ran
Developing favorable charge transfer mode for photocatalytic hydrogen evolution in a photocatalyst is a promising way to enhance photocatalytic activity . In this study, MOF, decorated with different functional groups, was initially used as charge transfer mode convertor coupled with CdS/α-NiS-β-NiS. The NH 2 -UiO-66/CdS/α-NiS-β-NiS lead to twice and triple higher H 2 evolution compared to (OH) 2 -UiO-66/CdS/α-NiS-β-NiS and UiO-66/CdS/α-NiS-β-NiS respectively under simulated sunlight. The NH 2 -UiO-66 provides suitable energy band structure to formed Z-scheme with CdS/α-NiS-β-NiS, which plays a synergistic role in the photocatalytic process. The loading of α-NiS-β-NiS significantly improves the visible light absorption ability and provides abundant active sites. As a result, the α-NiS-β-NiS/CdS/NH 2 -UiO-66 show considerable photocatalytic hydrogen production rate of 17.88 mmol h −1 g −1 , which is 7.9 times and 2.5 times as high as-those of pure CdS and 7-α-NiS-β-NiS/CdS, and it also shows a prominent apparent quantum efficiency (AQE) of 14.7% at 420 nm. This work provides a new insight design a metal organic frameworks based heterojunction with highly-efficient photo-induced charge separation and excellent visible-light absorption ability.
研究领域:
材料科学
·
光催化
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Fan Mingli,Li Xue,Wei Dandan,Wang Yinling,Li Maoguo
Transition metal chalcogenides are promising hydrogen evolution reaction (HER) electrocatalysts ; however, their performance still needs to be improved to meet the requirements of practical applications. Herein, an interface-engineering strategy is exploited to prepare efficient transition metal chalcogenide based HER catalysts in alkaline medium. Specifically, the heterogeneous nanostructure of 1D core-shell Te@NiTe 2 and 2D NiS (Te@NiTe 2 /NiS) has been fabricated by an easy one-step solvothermal method . The HER activity of Te@NiTe 2 /NiS is optimized by adjusting the ratio of raw materials and reaction time. Under the optimum conditions, the Te@NiTe 2 /NiS displays higher HER activity than individual Te@NiTe 2 and NiS in alkaline medium and the reasons are investigated in detail. To improve the HER activity of Te@NiTe 2 /NiS, the Te@NiTe 2 /NiS is further combined with conductive acetylene black (AB) by physically mixing. The resulting Te@NiTe 2 /NiS/AB has a low overpotential at 10 mA/cm 2 of 101 mV, higher current density than 20% Pt/C when the overpotential is larger than 0.37 V and good long-term stability, indicating its practicability as HER electrocatalysts. This work presents the validity of interface-engineering strategy in preparing highly efficient transition metal chalcogenides based HER electrocatalysts.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2014
·
IF 2.871
Lei Yu,Bin Yang,Qi Liu,Jingyuan Liu,Xin Wang,Dalei Song,Jun Wang,Xiaoyan Jing
In this article, interconnected and staggered nickel sulfide nanosheets grown on nickel foam have been successfully prepared by an ultrasound-assisted soaking method using nickel hydroxide nanosheets as precursor. As electrode material for supercapacitor, the nickel sulfide nanosheets are characterized by cyclic voltammetry (CV), galvanostatic charge–discharge and electrochemical impedance spectroscopy (EIS) measurements. Owing to the unique structure, the nickel sulfide nanosheets exhibit excellent electrochemical performance, including high area capacitances (2.64 F cm −2 ) and remarkable cycling stability (90% retaining after 2000 cycling). Therefore, such a novel and facile synthetic route to synthesis the high-performance nickel sulfide nanosheets may open a new pathway to prepare sulfide materials with distinctive nanostructures and outstanding electrochemical performance. At the same time, asymmetric supercapacitor is fabricated with NiS-NF as positive material and active carbon as negative material. The asymmetric supercapacitor shows excellent long-term electrochemical stability and high energy density. All these results illustrate that the NiS-NF electrode is promising for potential application in supercapacitors and other fields.
研究领域:
材料科学
·
电化学
·
纳米技术
·
储能
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Chunxiao Li,Yuying Feng,Jiahui Jiang,Jingjing Zhu,Heju Gao,Ting Zhao,Guancheng Xu,Li Zhang
Nickel-based sulfides have been proven to be excellent oxygen evolution reaction (OER) electrocatalysts due to their excellent electrical conductivity, but their poor stability hinders their application in practical applications. To address this issue, defect engineering has been proposed as a viable strategy to enhance the electronic structure of the catalyst and further boost the OER performance. Herein, a MOF-derived Sn-doped NiS/Ni3S2 nanostructure grown in situ on nickel foam (Sn–NixSy/NF) has been designed as an active OER electrocatalyst. The morphology of the material was significantly impacted by the addition of the Sn elements, nanorods modified with nanoparticles providing more active sites. Moreover, the introduction of Sn elements induced the generation of sulfur vacancies (Vs), enhanced electron transfer, promoted electron redistribution, and increased the charge transfer rate. All of these endow the Sn–NixSy/NF-T with exceptionally low overpotentials of 104 and 286 mV to achieve a current density of 10 and 100 mA cm–2 for OER. Moreover, the Sn–NixSy/NF-T showed long-term stability, maintaining 100 h at current densities of 100 mA cm–2. In short, this work opened a route for engineering defects to boost the OER.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2020
·
IF 8.247
Haishun Jiang,Kenan Zhang,Wenyao Li,Zhe Cui,Shu-Ang He,Siyu Zhao,Jun Li,Guanjie He,Paul R. Shearing,Dan J.L. Brett
It is important to develop a low-cost and easy-prepared electrocatalyst for hydrogen evolution reaction . In this work, MoS 2 /NiS hierarchical nanostructures (HHs) were fabricated on Ni foam by a simple one-step hydrothermal reaction using Ni foam as raw materials directly. Owing to the unique synthetic strategy that provide uniform MoS 2 /NiS HHs structure on the porous Ni foam, generate abundant active surfaces, small resistance, furthermore it is beneficial for carrier migration and contributing to a large number of active sites. Excellent electrocatalytic performances are obtained such as an overpotential of only ~84.1 mV to reach the current density of 10 mA cm −2 , a Tafel slope of 76.9 mV dec −1 and a small inherent resistance of 6.33 Ω. More importantly, a quick current response under multistep potentials is realized and an excellent stability retained after 3000 cycles of CV test. Besides, a DC power to supply a device (MnMoO 4 //MoS 2 /NiS HHs B) under 1.6 V can generate a current density of 21 mA cm −2 , demonstrating its practical application.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2023
·
IF 3.9
Ranran Guo,Zhaozhao Yang,Xiaosen Pan,Xiaojun Ma,Yujuan Qiu,Jie Li
Carbon-based supercapacitors with high performance have a wide foreground among various energy storage devices. In this work, wood-based hollow carbon spheres (WHCS) were prepared from liquefied wood through the processes of emulsification, curing, carbonization, and activation. Then, the hydrodeposition method was used to introduce nickel sulfide (NiS) to the surface of the microspheres, obtaining NiS/WHCS as the supercapacitor electrode. The results show that NiS/WHCS microspheres exhibited a core–shell structure and flower-like morphology with a specific surface (307.55 m2 g–1) and a large total pore volume (0.14 cm3 g–1). Also, the capacitance could be up to 1533.6 F g–1 at a current density of 1 A g–1. In addition, after 1000 charge/discharge cycles, the specific capacitance remained at 72.8% at the initial current density of 5 A g–1. Hence, NiS/WHCS with excellent durability and high specific capacitance is a potential candidate for electrode materials.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）