MOLECULES
·
2024
·
IF 4.2
Yuqing Yan,Yonghui Wu,Chenggen Lu,Yu Wei,Jun Wang,Bo Weng,Wei-Ya Huang,Jia-Lin Zhang,Kai Yang,Kangqiang Lu
CdS quantum dots (CdS QDs) are regarded as a promising photocatalyst due to their remarkable response to visible light and suitable placement of conduction bands and valence bands. However, the problem of photocorrosion severely restricts their application. Herein, the CdS QDs-Co 9 S 8 hollow nanotube composite photocatalyst has been successfully prepared by loading Co 9 S 8 nanotubes onto CdS QDs through an electrostatic self-assembly method. The experimental results show that the introduction of Co 9 S 8 cocatalyst can form a stable structure with CdS QDs, and can effectively avoid the photocorrosion of CdS QDs. Compared with blank CdS QDs, the CdS QDs-Co 9 S 8 composite exhibits obviously better photocatalytic hydrogen evolution performance. In particular, CdS QDs loaded with 30% Co 9 S 8 (CdS QDs-30%Co 9 S 8 ) demonstrate the best photocatalytic performance, and the H 2 production rate reaches 9642.7 μmol·g −1 ·h −1 , which is 60.3 times that of the blank CdS QDs. A series of characterizations confirm that the growth of CdS QDs on Co 9 S 8 nanotubes effectively facilitates the separation and migration of photogenerated carriers, thereby improving the photocatalytic hydrogen production properties of the composite. We expect that this work will facilitate the rational design of CdS-based photocatalysts, thereby enabling the development of more low-cost, high-efficiency and high-stability composites for photocatalysis.
研究领域:
材料科学
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纳米技术
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光催化
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能源材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2024
·
IF 7.1
Xiaoqi Zhu,Lin Chen,Qisheng Fang,Jianli Cheng,Yuefeng Su,Paula Ratajczak,Francois Beguin,Bin Wang
Li-CO2 batteries with attractive characteristics of high energy density power supply and carbon dioxide fixation have attracted widespread attention. However, the lack of suitable cathode catalysts and their unsatisfactory electrochemical performance have impeded their development as promising Li-CO2 batteries for energy storage. Constructing heterojunctions by interfacial engineering to improve performance is considered one of the effective strategies. Herein, heterostructured CuCo2S4-Co9S8 nanosheets are fabricated by a facile hydrothermal method and employed as efficient cathode catalysts for Li-CO2 batteries. The construction of heterojunctions by interfacial engineering has proved as an effective strategy to enhance the electrochemical performance of the Li-CO2 batteries. The delocalized electrons between CuCo2S4 and Co9S8 contribute to a low median charge potential (∼3.6 V), small polarization (0.62 V), high energy efficiency of up to 83%, and outstanding cycle life (480 h) of the CuCo2S4-Co9S8 cathodes. Meanwhile, as a proof of concept, flexible fiber-shaped Li-CO2 batteries based on these cathodes are fabricated and demonstrate boosted flexibility adaptability and provide a stable power supply at various bending conditions.
研究领域:
材料科学
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电化学
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能源存储
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纳米技术
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2024
·
IF 20.2
Shanpeng Li,Yuling Zhuo,Dong Liu,Hui Pan,Zhenbo Wang
Improving the Pt atoms utilization efficiency on self-supported electrodes is crucial for industrial seawater hydrogen production , but effective strategies are still lacking. Herein, we reported a novel strategy to anchor highly surface-exposed Pt single atoms on Ni 3 S 2 /Co 9 S 8 with abundant S vacancies (Pt–Ni 3 S 2 /Co 9 S 8 –Sv) as a self-supported electrode. Physical characterizations and theoretical calculations confirm that the strong Pt–S electron bridges with the coordinating role of surface S vacancies triggers the d -orbital electron rearrangements and regulates the local electron structures between the Co/Ni and Pt sites. Notably, the Pt–Ni 3 S 2 /Co 9 S 8 –Sv electrode displays an ultralow overpotential of 18 mV at 10 mA cm −2 in alkaline seawater . More importantly, our Pt–Ni 3 S 2 /Co 9 S 8 –Sv electrode assembled into an alkaline electrolysis cell can work continuously for 50 h under alkaline seawater @ 60 °C. This work provides a promising strategy for designing highly surface-exposed single-atomic catalyst for large-scale hydrogen evolution through seawater electrolysis.
研究领域:
材料科学
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催化化学
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能源化学
✓ 已验证
产品关联
DOI
高影响因子
Results in Engineering
·
2025
·
IF 7.9
Peihong Deng,Aiting Chen,Shuting Shi,Chuanqin Zhou,Nana Tang,Quanguo He
A cost-effective and simple electrochemical approach was developed for the simultaneous detection of tryptophan (Trp), uric acid (UA) and dopamine (DA). Through hydrothermal synthesis, Co 9 S 8 was combined with graphene oxide (GO) using physical ultrasound. Subsequently, the Co 9 S 8 -RGO/GCE was created by electrochemically reducing a Co 9 S 8 -GO dispersion after drop-coating it onto the GCE surface. The amalgamation of Co 9 S 8 with RGO conferred the sensor with remarkable sensitivity, outstanding selectivity, and robust catalytic prowess towards DA, UA and Trp. The ternary mixture exhibited notable peak separations of up to 160 mV, 278 mV, and 438 mV between DA–UA, UA–Trp, and DA–Trp, respectively. The linear calibration ranges spanned 0.1–2.0 μM and 2.0–10 μM for DA, 0.06–10 μM for UA, and 0.02–10 μM for Trp, with matching 0.04 µM for DA, 0.02 µM for UA, and 6.0 nM for Trp detection limits (S/N=3). Moreover, the sensor's effective use in the identification of DA, UA and Trp in authentic samples yielded satisfactory results.
研究领域:
分析化学
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生物医学工程
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
CARBON
·
2021
·
IF 9.594
Pengcheng Zhang,Mengjue Cao,Yi Feng,Jie Xu,Jianfeng Yao
Lithium-ion capacitor (LIC) possesses multiple merits of Faradaic and capacitive behaviors and shows excellent energy and power densities. Herein, Co 9 S 8 nanoparticles embedded on melamine foam derived three-dimensional (3D) carbon foam (M-Co 9 S 8 @NCF) was successfully constructed by an in-situ anchoring and annealing method. When the composite was used as a free-standing anode electrode of lithium-ion battery, volume expansion effect is relieved and reaction kinetic is significantly improved benefitting from the synergistic effect of unique 3D carbon network and ultrafine nanoparticles. Therefore, the M-Co 9 S 8 @NCF free-standing electrode delivers superior rate performance (1024 mAh g −1 at 0.1 A g −1 and 468 mAh g −1 at 2 A g −1 ) and stable cycling performance (617 mAh g −1 at 1 A g −1 for 500 cycles). Moreover, porous nitrogen-doped carbon foam (PNCF) was synthesized as the cathode of LIC. M-Co 9 S 8 @NCF//PNCF LIC device was then fabricated to combine the advantages of battery-type anode and supercapacitor-type cathode, which achieves a high energy density (166 Wh kg −1 at 182 W kg −1 ), high power density (83 Wh kg −1 at 7674 W kg −1 ) as well as satisfactory capacitance retention (83.5% at 5 A g −1 after 5000 cycles). This work offers a convenient method to construct metal sulfide-based free-standing electrode for the advanced lithium-ion storage devices.
研究领域:
材料科学
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2019
·
IF 8.355
Shizong Wang,Jianlong Wang
High efficient and stable activator is desired for the sulfate radical-based wastewater treatment. Cobalt sulfide and cobalt oxide have high catalytic activity for peroxymonosulfate (PMS), but poor stability. Here, a novel composite, nano Co 9 S 8 and CoO encapsulated by nitrogen and sulfur co-doped sludge-derived biochar (CoO/Co 9 S 8 @N-S-BC) was synthesized, characterized and applied for activating PMS. The results showed that CoO/Co 9 S 8 @N-S-BC can effectively activate PMS for sulfamethoxazole (SMX) degradation, and 0.08 mM of SMX could be completely degraded within 10 min. The influencing factors, such as pH, temperature, chloridion, carbonate and humic acid were investigated. The SMX degradation conformed to pseudo first-order kinetics with rate constant of 0.379 min −1 . Sulfate radicals (dominant) and hydroxyl radicals contributed to SMX degradation. Carbon defects, pyridinic N, quaternary N, the carbon atoms next to pyridinic N, C O groups, -C-S-C and Co(II), all contributed to PMS activation.
研究领域:
环境科学
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化学工程
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
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2022
·Vol. 51
·期 6
·2909-2917
·
IF 2.047
Han Yi,Jiang Wenwu,Jiang Jing,Zhou Ji,Ding Yanhuai
ZIF-67 has been widely utilized for the preparation of Co-based catalysts, N-doped porous carbon, and a variety of energy storage nanomaterials. In this paper, ultrafine Co 9 S 8 nanoparticles derived from ZIF-67 have been employed to improve the electrochemical performance of N-doped carbon nanofibers (CNFs). The Co 9 S 8 nanoparticles embedded into the CNFs provide the composites with extra Li-storage capacity and high rate capability. An accessible discharge capacity around 762 mAh g −1 can be obtained at a current density of 0.1 A g −1 after 100 cycles. Besides, the composites exhibit better cycling performance and rate capability compared with the raw N-doped CNFs.
研究领域:
材料科学
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电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Luping Feng,Jianghong Wang,Lixiang Zhang,Jiadong Li,Yifan Zhang,Minghong Xu,Peisong Tang,Hua Wang
Tubular Co 9 S 8 /CdS heterostructures have been successfully synthesized by in-situ growing CdS onto Co 9 S 8 nanotubes through a simultaneous immobilization and in-situ reduction strategy. It turned out that the so-obtained heterostructure with Co 9 S 8 /CdS molar ratio of 1/10 can display a broad light absorption edge and especially much enhanced capacity for photocatalytic reduction of Cr(VI) under visible light . The characterization analysis and experimental results suggested that an interfacial electrostatic field between Co 9 S 8 and CdS elements in the heterostructure could be constructed due to their different Fermi levels , allowing for more quantities of highly reductive electrons to participate in the photocatalytic reaction. Therefore, the so-obtained Co 9 S 8 /CdS (1/10) heterostructures could achieve the photocatalytic reduction efficiency of 100% within 20 min, which was more than two and four times larger than that of pristine CdS and Co 9 S 8 , respectively. Moreover, the possible photocatalytic reaction mechanism for reducing Cr(VI) was investigated and found to follow the direct Z-scheme charge transfer pathway. This novel fabrication route for composite photocatalysts with tubular heterostructures could lead to the widespread implementations for the elimination of various harmful pollutants in the process of environmental governance.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Yanting Dou,Bobo Bai,Jiqi Zheng,Xiufang Wang,Yu Gao,Yi Li,Qiuhui Bu,Fu Ding,Yaguang Sun,Zhenhe Xu
The effective combination of two metallic sulfides to form a heterojunction and regulate semiconductor structure can significantly improve the response of photocatalysts under visible light. In this study, we have successfully grown Ag-doped ZnIn2S4 nanosheets randomly on carefully designed hollow Co9S8 polyhedral nanocages to construct the Co9S8/Ag:ZnIn2S4 heterojunction. The optimized 1.0 wt % Co9S8/Ag:ZnIn2S4 heterostructure shows excellent activity with the H2 generation rate of 1947.7 μmol g–1 h–1, which is 1.58 times greater than the Ag:ZnIn2S4 (1232.0 μmol g–1 h–1). However, pure Co9S8 has a narrow band gap but almost no response in visible light due to the fast photogenerated carrier recombination rate. The degradation trend of methyl orange (MO) in all as-prepared samples is the same as that of hydrogen production. The compound with the Co9S8 mass fraction of 1.0 wt % has the fastest degradation rate and can completely degrade MO within 16 min. In addition, the Co9S8/Ag:ZnIn2S4 heterostructure has also shown long-term stability after 20 photocatalytic hydrogen evolution and MO degradation cycle experiments, respectively. This work highlights the significance of improving the photocatalytic performance by modulating the morphology of metallic semiconductors and constructing heterostructures.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2025
·
IF 5.5
Tianmin Zhang,Ming Xiang,Xianfeng Yang,Cheng Fu,Zhaoxiong Yan,Zhihua Xu
Metal sulfides are regarded as promising candidates for electrocatalytic applications owing to their highly conductive metal sulfide frameworks serving as the core and high-valence metal active layers functioning as the shell during the electrooxidation process. However, the catalytic ability of a single metal sulfide still needs to be optimized. Herein, a straightforward hydrothermal sulfidation approach was employed to fabricate a uniquely structured electrode composed of Ni3S2–Co9S8 heterojunction embedded in interconnected cobalt layered double hydroxide nanosheets grown on nickel foam (NF) (Ni3S2–Co9S8/Co LDH/NF). The Ni3S2–Co9S8/Co LDH/NF electrode demonstrated a low overpotential (240 mV at 10 mA cm–2) and a small Tafel slope (35.1 mV/dec) in the oxygen evolution reaction (OER). Furthermore, it exhibited a small Tafel slope (15.5 mV/dec) in the 5-hydroxymethylfurfural (HMF) oxidation reaction, achieving nearly 100% conversion of HMF and an approximately 86% yield of 2,5-furandicarboxylic acid (FDCA). The synthesis of Co LDH nanostructure on nickel foam facilitated the dispersion of the Ni3S2–Co9S8 heterojunction, thereby exposing more active sites and enhancing the mass transfer. Additionally, experimental results revealed that the electronic interactions at interfaces enabled precise adjustment of the electronic structure while promoting the formation of high-valence nickel species. Electrochemical measurements verified that the multiphase composite structure fabricated by interface engineering effectively reduced the interfacial impedances and charge transfer resistances, which in turn improved electrocatalytic performances for the OER and HMF oxidation reaction. This research provides a method for constructing a structure-optimized metal sulfide-based electrocatalyst, which can efficiently drive both the OER and oxidative HMF valorization.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Na Wang,Wenjing Hou,Yunzhen Chang,Hua Song,Honggang Li,Yanping Li,Gaoyi Han
Flexible energy storage devices attracted extensive attention due to their application in personal wearable electronic products. However, the applications of flexible energy storage devices, especially supercapacitors are limited by their low energy density, because anode materials with large capacitance are scarce for the devices based on aqueous electrolyte. Therefore, developing high-performance anode is an effective way to break through the low energy density of flexible devices. Herein, the electroless plating method was used to prepare a flexible cobalt metal substrate based on carbon cloth (CC). The composite of Co 9 S 8 and reduced oxide graphene (rGO/Co 9 S 8 (rGO)/CC) is prepared by one-step hydrothermal method as a flexible anode with outstanding performance. Benefiting from the high hydrogen storage capacity of rGO/Co 9 S 8 (rGO), only a small amount of anode materials are needed to match the capacity of the cathode material of rGO/Ni 3 S 2 (rGO). The optimized flexible device assembled by using rGO/Co 9 S 8 (rGO) as negative electrode and rGO/Ni 3 S 2 (rGO) as positive electrode shows a high specific capacitance of 192.4 mAh g −1 at the current density of 4.0 A g −1 , large energy density (168.1 Wh kg −1 at 3.5 kW kg −1 ). Furthermore, the network structure of the electrode can provide enough space for the expansion and contraction of the electrode materials during the repeated charging and discharging process, so the device exhibits good cycle stability (the capacitance of the device can retain 84.3% after 6000 cycles). Moreover, the device also exhibits remarkable flexibility. These results reveal that this kind of electrochemical hydrogen storage material can be developed as a promising anode in flexible energy storage devices.
研究领域:
材料科学
·
能源存储
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Hongmei Li,Xing Qian,Chong Xu,Shaowei Huang,Changli Zhu,Xiancai Jiang,Li Shao,Linxi Hou
The development of highly active and stable earth-abundant electrocatalysts to reduce or eliminate the reliance on noble-metal based ones for hydrogen evolution reaction (HER) over a broad pH range remains a great challenge. Herein, hierarchical porous Co9S8/N-doped carbon@MoS2 (Co9S8/NC@MoS2) polyhedrons have been synthesized by a facile hydrothermal approach using highly conductive Co/NC polyhedrons composed of cobalt nanoparticles embedded in N-doped carbon matrices as both the structural support and cobalt source. The Co/NC polyhedrons were prepared by direct carbonization of Co-based zeolitic imidazolate framework (ZIF-67) in Ar atmosphere. Benefiting from the prominent synergistic effect of N-doped carbon enhancing the conductivity of the hybrid, MoS2 and Co9S8 providing abundant catalytically active sites as well as the well-defined polyhedral structure promoting mechanical stability, the as-synthesized Co9S8/NC@MoS2 shows excellent HER activity and good stability over a broad pH range, with onset overpotentials of 4, 38, and 45 mV, Tafel slopes of 60.3, 68.8, and 126.1 mV dec–1, and overpotentials of 67, 117, and 261 mV at 10 mA cm–2 in 1.0 M KOH, 0.5 M H2SO4, and 1.0 M phosphate buffer solution (PBS), respectively. This work provides a general and promising approach for the design and synthesis of inexpensive and efficient pH-universal HER electrocatalysts.
研究领域:
材料科学
·
电化学
·
催化
✓ 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）