Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 25
·12056-12065
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IF 9.931
Yudi Niu,Xing Qian,Jie Zhang,Weimin Wu,Hongyu Liu,Chong Xu,Linxi Hou
Yolk–shell nanocages possessing complex internal structure and excellent structural tenability are advantageous for the preparation of advanced catalysts. Due to outstanding features such as superior electrical, magnetic, optical and catalytic properties, non-noble metal materials with hollow nanostructures have been considered potential substitutes for highly active and stable abundant noble-metal electrocatalysts. In this study, the as-prepared CoS2–C@CoS2 yolk–shell nanocages were applied in both dye-sensitized solar cells (DSSCs) and hydrogen evolution reactions (HERs). Due to the remarkable structural features and advantageous chemical compositions, CoS2–C@CoS2 yolk–shell nanocages comprising tiny crystals possessed large surface area (161 m2 g−1), well-defined interior voids, excellent conductivity and high catalytic activity. The DSSC with CoS2–C@CoS2 achieved a high power conversion efficiency (PCE) of 9.32% under AM 1.5 G irradiation, and it outperformed the DSSC with Pt (8.24%). Besides, CoS2–C@CoS2 as a kind of HER catalyst also exhibited a low onset overpotential of 19.0 mV, small Tafel slope of 51.9 mV dec−1 and low overpotential of 79.1 mV at a current density of 10 mA cm−2 under acidic conditions (0.5 M H2SO4).
研究领域:
材料科学
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能源科学
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化学工程
✓ 已验证
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 50
·28684-28691
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IF 2.936
Ka Wang,Weilan Guo,Shancheng Yan,Haizeng Song,Yi Shi
The traditional method of preparing hydrogen and oxygen as efficient clean energy sources mainly relies on the use of platinum, palladium, and other precious metals. However, the high cost and low abundance limit wide application of such metals. As such, one challenging issue is the development of low-cost and high-efficiency electrocatalysts for such purposes. In this study, we synthesized Co–FeS2/CoS2 heterostructures via a hydrothermal method for efficient hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). Benefitting from their unique three-dimensional hierarchical nanostructures, Co-doped FeS2, and CoS2 formed heterostructures on Co–FeS2 petals, which bestowed remarkable electrocatalytic properties upon Co–FeS2/CoS2 nanostructures. Co–FeS2/CoS2 effectively catalyzed the OER with an overpotential of 278 mV at a current density of 10 mA cm−2 in 1 M KOH solution, and also is capable of driving a current density −10 mA cm−2 at an overpotential of −103 mV in 0.5 M H2SO4 solution. The overpotential of the OER and HER only decreased by 5 mV and 3 mV after 1000 cycles. Our Co–FeS2/CoS2 materials may offer a promising alternative to noble metal-based electrocatalysts for water splitting.
研究领域:
材料科学
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能源化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
DALTON TRANSACTIONS
·
2021
·Vol. 50
·期 37
·12879-12887
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IF 4.39
Tingting Zhang,Qiu Zhang,Yumeng Wang,Fengyan Li,Lin Xu
A low cost H3PW12O40 (PW12)/CoS2 complex is prepared and used as a counter electrode (CE) to combine with sandwich quantum dot sensitized solar cells (QDSSCs) composed of a TiO2/CdS/CdSe/ZnS photoanode and polysulfide electrolyte to study their photovoltaic properties via a simple hydrothermal method. Under standard simulated sunlight, the photoelectric conversion efficiency (PCE) of 2%PW12 (PW12-2/CoS2) doped CEs was 6.29%, which was significantly 67.7% higher than those of QDSSCs based on undoped CoS2 CEs (3.75%). Due to the introduction of PW12, the nanoparticles forming the hollow structure of CoS2 changed from regular octahedra to rough nanoparticles, which increase the active sites. At the same time, the work function of CoS2 decorated with PW12 is decreased. This study and discovery demonstrate that POMs can be used to optimize CE materials and improve the photoelectric conversion efficiency of QDSSCs, which provide an experimental and theoretical basis for subsequent investigations.
研究领域:
材料科学
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能源科学
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化学
✓ 已验证
DOI
高影响因子
Applied Materials Today
·
2019
·
IF 8.013
Xianwen Wang,Xiaoyan Zhong,Zhengbao Zha,Gang He,Zhaohua Miao,Huali Lei,Qunyi Luo,Rui Zhang,Zhuang Liu,Liang Cheng
Retaining in tumors for cancer diagnosis/treatment with sequential elimination from body is crucial to the clinical translation of inorganic medicaments. Herein, monodispersed CoS 2 nanoclusters (CoS 2 NCs) assembled from ultrasmall nanocrystals oligomerization via the La Mer scheme were successfully developed for chemodynamic therapy (CDT) of cancer cells due to the Fenton-like catalytic activity. Owing to their excellent photothermal conversion ability, both in vitro and in vivo cancer cell-killing efficacy of CoS 2 NCs could be greatly enhanced upon near infrared (NIR) light irradiation, suggesting that generated heat would accelerate the Fenton-like catalytic reaction rate. Moreover, the structure of loosely stacking of CoS 2 nanocrystals not only endowed CoS 2 NCs more catalytic reaction sites to convert endogenous H 2 O 2 into cytotoxic OH in tumor region, but also facilitated them degrading into ions in vivo and rapidly excreting from body by feces and urine through the reticuloendothelial systems, without causing any appreciable toxicity confirmed by systematic toxicological evaluation. Thus, our study demonstrated that these CoS 2 NCs with biodegradable behaviors and highly integrated properties might have broad applications for cancer treatment.
研究领域:
医学
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材料科学
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肿瘤学
✓ 已验证
DOI
高影响因子
Nanoscale Horizons
·
2022
·Vol. 8
·期 3
·338-345
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IF 11.684
Jie Wu,Xuetao Qin,Yu Xia,Yuanyuan Zhang,Bin Zhang,Yunchen Du,Hsing-Lin Wang,Siwei Li,Ping Xu
Transition metal sulfides (TMSs) are promising electrocatalysts for hydrogen evolution reaction (HER), while TMSs usually suffer from inevitable surface oxidation in air, and the impact of the surface oxidation on their HER catalytic activity remains unclear. Herein, we demonstrate an effective strategy for reducing the surface oxidation degree of easily oxidized CoS2 by introducing glued vanadium pentoxide (V2O5) nanoclusters, taking advantage of the preferential adsorption and strong interaction between high-valence V and O2. Combining oxidation protection and elaborate oxidation control experiments reveal that reduced surface oxidation degree of CoS2 is conducive to affording promising HER catalytic performance, as the oxidized surface of CoS2 can hinder the dissociation of water and thus is harmful to the HER process. Direct evidence is provided that surface oxidation should be carefully considered for TMS-based HER catalysts. The present work not only develops a new strategy for protecting CoS2 from surface oxidation, but also provides deep insight into the impact of surface oxidation on the HER performance of transition metal compounds.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Yuanwu Liu,Jing Li,Wentian Huang,Ying Zhang,Minjie Wang,Xingsen Gao,Xin Wang,Mingliang Jin,Zhipeng Hou,Guofu Zhou,Zhang Zhang,Junming Liu
Two-dimensional/one-dimensional (2D/1D) heterostructures have received much attention from researchers for their abundant catalytically active sites and low contact resistance due to formation of chemical bonds at the interface. The investigation of such heterostructures, however, is confined to lattice-matched materials, which severely limits the material candidates. Herein, we demonstrate a lattice-mismatched 2D/1D heterostructured electrocatalyst consisting of 2D ReS2 nanosheets and 1D CoS2 nanowires. We propose that the higher surface energy of the CoS2 nanowire and the lattice mismatch between 1D and 2D units are crucial for the growth process of ReS2 nanosheets. More importantly, the terminal S2– exposed on the surface of CoS2 nanowires serves not only as the nucleus of ReS2 nanosheets but also as a bridge to enhance electron transport efficiency. Thus, the ReS2/CoS2 heterostructures show outstanding hydrogen evolution reaction performance. This work is of general interest for the design of complex multidimensional nano-heterostructures with outstanding functionalities.
研究领域:
材料科学
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催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
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2022
·Vol. 46
·期 45
·21560-21567
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IF 3.925
Jinyang Liu,Yan Zhou,Xiuniang Tan,Shengjiang Zhang,Chunjiao Mo,Xiaobo Hong,Taolong Wu,Xuecai Tan,Yanjuan Liao,Zaiyin Huang
The establishment of heterojunctions is an effective way to improve the performance of semiconductor photocatalysts as a solution to solve environmental pollution problems; however, the decomposition efficiency of organic pollutants driven by sunlight remains a challenge. Herein, CoS2-decorated CdS hetero-junctions as highly efficient photocatalysts were rationally synthesized via a three-step process and CoS2-decorated CdS composites were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, UV-Vis diffusion reflectance spectrometry, fluorescence spectroscopy analysis, X-ray photoelectron spectroscopy, electron paramagnetic resonance spectroscopy, and transient photocurrent measurement. Using organic dyes rhodamine B (Rh B) and nitenpyram (NTP) as model pollutants, the performance of the CoS2-decorated CdS composites for the degradation of model pollutants were evaluated. Among them, the material with the best performance can degrade 99.5% Rh B and 92.5% NTP within 120 min. Furthermore, the catalyst still maintained its high catalytic activity after five cycles. This work provides a new idea for developing efficient and inexpensive hetero-junctions as photo-catalysts.
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
Nanomaterials
·
2022
·Vol. 12
·期 16
·2876
·
IF 5.719
Dongwei Xu,Huanhuan Guo,Feifan Zhang,Yanmei Wu,Xiaoqin Guo,Yumei Ren,Desheng Feng
Hollow nanoboxes structure have raised great attention as microwave absorption materials on account of their ultralow density and large specific area. By introducing an adjustable interior cavity structure, the dielectric loss and microwave absorption performance were affected by the tunable complex permittivity and impedance matching was improved. In our study, hollow CoS2nanoboxes with designable interspaces were successfully fabricated based on the surfactant-assisted solution method and followed by an in situ ion-exchange process. The structure, elemental compositions and morphology of the products were characterized by XRD, XPS, EDX, SEM and TEM, respectively. In addition, microwave absorption performance and the intrinsic mechanism are investigated in-depth. The paraffin-based composites with 20 wt.% filling contents exhibited superior microwave absorption capacities in view of both maximum reflection loss value (RLmax, −54.48 dB) and effective absorption bandwidth (EAB, below −10 dB, 6.0 GHz), which can be ascribed to unique hollow structure and good impedance matching. With these considerations in mind, this study provides a reference for the construction of high-performance microwave absorbers with unique hollow structure.Keywords:CoS2;hollow nanoboxes;ion-exchange;microwave absorption
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2021
·
IF 5.097
Jin Wang,Yi Wang,Dun Zhang,Chao Chen,Zhanxu Yang
Harvesting a remarkable antibacterial performance is a major point to choose enzymatic catalytic and photocatalytic coupling catalysts. Here, Co–Mo–S mixed metal sulfides (MMSs) were composed by tailoring the composition and energy of metal organic framework (MOF)-based precursors. When n(Co)/n(Mo) = 1:1, Co/Mo-MOF is in the lowest energy state and the vulcanized CoS2/MoS2 nanosheets (NSs) exhibit the best enzymatic property. With the inherent photocatalytic activity, CoS2/MoS2 NSs can degrade more than 90% of methylene blue, methyl orange, rhodamine B, and tetracycline hydrochloride within 1 h. Promoted by intrinsic photocatalytic properties, CoS2/MoS2 NSs exhibit outstanding mimic enzyme-mimicking abilities in a neutral medium, which solve the big problem that nanozymes can only work in acidic environments. Due to the collaboration of enzymatic and photocatalytic catalysis, ·O2– can be generated in a neutral, no H2O2, and dark system, which can effectively kill Escherichia coli and Staphylococcus aureus. In all, the design of MOFs with adjustable compositions, the breakthrough of enzymatic catalysis working in a neutral medium, and the innovation of sterilization independent of external conditions encourage the utilization in an open environment and the construction of multifunctional materials in biotechnology, biosensors, and biomedicine.
研究领域:
材料科学
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生物医学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2019
·
IF 4.084
Peican Wang,Lei Wan,Yuqun Lin,Baoguo Wang
Here we report a strategy to prepare electrocatalysts for hydrogen generation based on MoS 2 grown on highly conductive CoS 2 decorated carbon cloth (MoS 2 /CoS 2 /CC) through a two-step method. The rational design of sandwich structure of MoS 2 /CoS 2 /CC electrode was significant for homogenously dispersing MoS 2 on the carbon substrate, tuning the properties of the MoS 2 and improving long-term durability. Benefiting from the sandwich structure with highly exposed edges, fast electron transport and additional active sites brought by interfacial sulfur of Mo S Co, the resulting MoS 2 /CoS 2 /CC electrode exhibited superior HER activity and excellent stability in acid solution including an overpotential of 118 and 159 mV at current density of 10 and 100 mA/cm 2 , respectively, a Tafel slope of 37 mV per decade and excellent cycling stability in acid solution. The high catalytic performance and simplicity of the preparation method suggest applicability of the MoS 2 /CoS 2 /CC electrode for large-scale practical applications.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2025
·
IF 7.5
Yuchen Han,Yue Han,Yuxin Liu,Xingmeng Xu,Tingyang Li,Ruiyang Zhao,Jishu Han,Lei Wang
In the field of photocatalytic hydrogen production, the construction of p-n heterojunction was an effective strategy to solve the problem of high electron-hole pair recombination rate. In this paper, CoS 2 /CoMn 2 O 4 p-n heterojunction photocatalysts were successfully synthesized by loading CoS 2 nanoparticles on the surface of CoMn 2 O 4 nanocubes. Due to the strong light absorption performance, abundant active sites, and low photogenerated carrier recombination rate, CoS 2 /CoMn 2 O 4 exhibited significantly enhanced photocatalytic hydrogen production activity. Under light irradiation, the hydrogen production rate of CoS 2 /CoMn 2 O 4 could reach to 17.03 mmol/g within 3 h. This study provided a new idea for designing high-efficiency p-n heterojunction photocatalysts.
研究领域:
材料科学
·
能源科学
·
光催化技术
✓ 已验证
产品关联
DOI
高影响因子
Molecular Catalysis
·
2024
·
IF 3.9
Yan-Bo Cao,Yan-Peng Ye,Wei-wei Dong,Zhi-biao Li,Yi Ding,Wei-li Kong,Xi Wang
Hydrogen, a new energy source that emits no carbon and has a high energy content, has recently attracted significant attention. The CoS 2 /MoS 2 catalyst was produced using a one-step hydrothermal synthesis process. With a current density of 10 mA cm −2 , the CoS 2 /MoS 2 catalyst shows an overpotential of 116.8 mV for the HER under the 300 W Xe lamp's solar simulation, a 23 % improvement over the dark condition. Both the properly prohibited bandwidths of CoS 2 and MoS 2 , which promote the creation of photogenerated carriers and the existence of a p-n junction between them, are responsible for improving the photo-enhanced HER performance. The photoinduced electro-hole pairs' separation is improved by this p-n junction, reducing their likelihood of recombination and thereby enhancing the electrocatalytic ability of the system. This work demonstrates the possibility of photoelectric synergistic enhancement of the electrocatalytic performance of transition metal sulfides.
研究领域:
材料科学
·
催化化学
·
能源科学
✓ 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）