Catalysts
·
2021
·Vol. 11
·期 2
·169
·
IF 4.146
Yan Tan,Yijun Yin,Xianhong Yin,Chenghao Lan,Yu Wang,Feilong Hu,Qin Huang,Yan Mi
The pursuit of low-cost and high-efficiency catalyst is imperative for the development and utilization of hydrogen energy. Heteroatomic doping which is conducive to the redistribution of electric density is one of the promising strategies to improve catalytic activity. Herein, the Se-doped CoS2porous nanowires array with a superaerophobic surface was constructed on carbon fiber. Due to the electronic modulation and the unique superaerophobic structure, it showed improved hydrogen evolution activity and stability in urea-containing electrolyte. At a current density of 10 mA cm−2, the overpotentials are 188 mV for hydrogen evolution reaction (HER) and 1.46 V for urea oxidation reaction (UOR). When it was set as a cell, the voltage is low as 1.44 V. Meanwhile, the current densities of HER and UOR, as well as of cell remained basically unchanged after a continuous operation for 48 h. This work opens up a new idea for designing of cost-saving hydrogen evolution electrocatalysts.Keywords:superaerophobic;cost-saving hydrogen evolution;heteroatom doping;electronic adjustment
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
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Qingbo Wei,Zhangwen Ye,Xianpei Ren,Xue Li,Mingli Yin,Lingxing Zan,Feng Fu
Structure and morphology play a crucial role in improving the performance of catalysts. In this work, we prepared core-shell structured CoS 2 @MoS 2 nanoparticles by a two-step hydrothermal method . The unique electrochemical properties of the core-shell CoS 2 @MoS 2 nanoparticles with a narrow size distribution centered at 20–30 nm were demonstrated. An excitation-dependent photoluminescence emission was observed for the core-shell CoS 2 @MoS 2 nanoparticles. These core-shell CoS 2 @MoS 2 nanoparticles showed an excellent catalytic activity towards hydrogen evolution reaction (HER), indicated by the onset potential of 190 mV ( vs. RHE), the overpotential of 276 mV at a current density of 10 mA cm −2 and the Tafel slope of 60 mV·dec −1 . Therefore, the developed core-shell CoS 2 @MoS 2 nanoparticles can be applied for HER for their excellent catalytic activities.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Frontiers in Chemistry
·
2018
·
IF 4.155
Zhang Wei,Ma Xiaoya,Zhong Cheng,Ma Tianyi,Deng Yida,Hu Wenbin,Han Xiaopeng
It is extremely meaningful to develop cheap, highly efficient, and stable bifunctional electrocatalysts for both hydrogen and oxygen evolution reactions (HER and OER) to promote large-scale application of water splitting technology. Herein, we reported the preparation of CoS2 nanoparticles supported on nitrogen-doped graphene (CoS2@N-GN) by one-step hydrothermal method and the enhanced electrochemical efficacy for catalyzing hydrogen and oxygen in water electrolysis. The CoS2@N-GN composites are composed of nitrogen-doped graphene and CoS2 nanocrystals with the average size of 73.5 nm. Benefitting from the improved electronic transfer and synergistic effect, the as-prepared CoS2@N-GN exhibits remarkable OER and HER performance in 1.0 M KOH, with overpotentials of 243 mV for OER and 204 mV for HER at 10 mA cm−2, and the corresponding Tafel slopes of 51.8 and 108 mV dec−1, respectively. Otherwise, the CoS2@N-GN hybrid also presents superior long-term catalytic durability. Moreover, an alkaline water splitting device assembled by CoS2@N-GN as both anode and cathode can achieve a low cell voltage of 1.53 V at 60 °C with a high faraday efficiency of 100% for overall water splitting. The tremendously enhanced electrochemical behaviors arise from favorable factors including small sized, homogenously dispersed novel CoS2 nanocrystals and coupling interaction with the underlying conductive nitrogen-doped graphene, which would provide insight into the rational design of transition metal chalcogenides for highly efficient and durable hydrogen and oxygen-involved electrocatalysis.
研究领域:
材料科学
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电化学
✓ 已验证
DOI
PubMed
高影响因子
RSC Advances
·
2023
·Vol. 13
·期 39
·27147-27157
·
IF 3.9
Dongwei Xu,Feifan Zhang,Huanhuan Guo,Sitong Liu,Shuaijiang Ma,Xiaoqin Guo,Ping Chen
The emerging electromagnetic radiation and interference problems have promoted the rapid development of microwave absorption materials (MAMs). However, it remains a severe challenge to construct high-performance microwave absorption materials with broadband, lightweight and corrosion resistance within low filling contents. Herein, hierarchical dandelion-like CoS2 hollow microspheres were reasonably constructed via a solvothermal-hydrothermal etching-in situ vulcanization process. The structure morphology, composition and electromagnetic performance of all samples have been thoroughly tested. The research results demonstrated that the structure morphology of the prepared samples with a volume ratio of 1 : 1 between ethanol and H2O remained intact without serious damage. Notably, the as-obtained hierarchical dandelion-like CoS2 hollow microspheres (25 wt%) exhibited excellent microwave absorption capacity with a minimum reflection loss (RLmin) of −47.3 dB and the corresponding effective absorption bandwidth (EAB) of 8.4 GHz at 3.3 mm. Moreover, the broadest effective absorption bandwidth (EAB, RL < −10 dB) reached 9.0 GHz (9.0–18.0 GHz) at the matching thickness of 3.2 mm. The unparalleled multiple features including hierarchical hollow structure, tunable complex permittivity as well as the enhanced impedance matching endowed CoS2 great promise as high-performance microwave absorbers for solving the problem of electromagnetic pollution.
研究领域:
材料科学
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电磁学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Chemistry Frontiers
·
2018
·Vol. 2
·期 9
·1732-1738
·
IF 0
Na Yao,Tan Tan,Fulin Yang,Gongzhen Cheng,Wei Luo
Exploring high-efficiency and stable nonprecious bifunctional electrocatalysts for the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER) is highly desirable but still challenging. Herein, we develop a versatile approach for the rational design and fabrication of highly open three-dimensional (3D) hierarchical architectures composed of two-dimensional (2D) CoS2 nanosheets grown on carbon cloth (CoS2 NS/CC) by vulcanizing well-aligned MOF-array precursors. Benefiting from the unique morphology with a high surface area, high density of active sites, and enhanced mass/electrolyte transfer, as well as facile release of the evolved gas, the as-synthesized CoS2 NS/CC exhibits superior catalytic performance and excellent durability for both the HER and OER. Furthermore, when used as a bifunctional electrocatalyst toward overall water splitting, a low cell voltage of 1.58 V is achieved at the current density of 10 mA cm−2 with long-term stability.
研究领域:
材料科学
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电化学
·
能源转换与存储
✓ 已验证
DOI
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Fang Liu,Fangqing Wang,Xinyu Sun,Ying Wang,Yang Liu,Shiqing Zhang,Ying Li,Yanming Xue,Jun Zhang,Chengchun Tang
Exploring efficient non-precious metal sulfides as electrocatalysts for the hydrogen evolution reaction (HER) is crucial. Cobalt disulfide (CoS 2 ) has gained attention for its favorable intrinsic activity, impressive metal conductivity, and cost-effectiveness. However, the weak adsorption of H* at the sulfur (S) sites on the surface of CoS 2 leaves room for enhancing its HER intrinsic activity. Vacancy engineering emerges as a valuable strategy to modulate the local charge density, optimizing hydrogen adsorption free energy and catalytic performance in HER. Taking advantage of plasma technology , known for its rapid and efficient defect creation, we synthesized porous CoS 2 nanowire arrays enriched with S vacancies (V s -CoS 2 /CC) through Ar plasma treatment . Notably, at a current density of 10 mA cm −2 , V s -CoS 2 /CC exhibits a lower overpotential (170 mV) compared to pure CoS 2 /CC (236 mV). Furthermore, V s -CoS 2 /CC demonstrates exceptional electrochemical stability. Experimental data and density functional theory calculations jointly reveal that introducing S vacancies reduces local charge density around S atoms, activating inert sulfur sites and enhancing the intrinsic activity of CoS 2 for HER. This study introduces a novel concept of defect-engineered activation in metal compound catalysts, employing a plasma approach to advance HER performance.
研究领域:
材料科学
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催化化学
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能源科学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Fangwei Ma,Xiaoyang Yang,Wei Jiang,Xin Cui,Guangping Lei,Haoyu Qiu,Zeyi Liu,Jiafeng Wan,Yi-Fu Liu
Electrochemical nitrate reduction reaction (e-NO3RR) to ammonia not only can effectively remove nitrate pollutants but also is a green strategy for ammonia synthesis. However, the conversion from NO3− to NH3 involves some undesired by-products and severe competing hydrogen evolution reactions (HER), limiting its further development. Herein, the rodlike CoMoO4@MoS2/CoS2 heterostructure with rich interfaces is easily designed via hydrothermal followed by gas-phase sulfurization method for efficient electrochemical nitrate reduction to NH3. Benefiting from the interface effect, the optimal CoMoO4@MoS2/CoS2-5 exhibits an excellent e-NO3RR performance with a high NH3 Faradaic efficiency (FE) of 96.11% and an NH3 yield rate of 0.45 mmol h−1 mgcat−1 at −0.8 V (vs RHE), which is superior to that of CoMoO4 and MoS2/CoS2. The validation experiments suggest that the heterointerface can inhibit the generation of by-products and competing HER, and greatly facilitate the hydrogenation process.
研究领域:
材料科学
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环境科学
·
电化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Yu Ma,Yujia Ouyang,Huanyu Liang,Ping Li,Jing Shi,Jingyi Wu,Shuai Liu,Jingwei Chen,Yue Zhu,Huanlei Wang
Metallic sulfides are currently considered as ideal anode materials for potassium-ion batteries by virtue of their high specific capacities. However, their low intrinsic electronic conductivity, large volume variation and dissolution of polysulfides in electrochemical reactions hinder their further development toward practical applications. Here, we propose an effective structural design strategy by encapsulating CoS 2 /SnS 2 in sulfur-doped carbon layers, in which internal voids are created to relieve the strain in the CoS 2 /SnS 2 core, while the sulfur-doped carbon layer serves to improve the electron transport and inhibit the dissolution of polysulfides. These features enable the as-designed anode to deliver a high specific capacity (520 mAh/g at 0.1 A/g), a high rate capability (185 mA h g −1 at 10 A/g) and lifespan (0.016 % capacity loss per cycle up to 1500 cycles). Our comprehensive electrochemical characterization reveals that the heterostructure of CoS 2 /SnS 2 not only promotes charge transfer at its interfaces, but also enhances the rate of K + diffusion. Additionally, potassium-ion capacitors based on this novel anode are able to attain an energy density up to 162 Wh kg −1 and ∼ 96 % capacity retention after 3000 cycles at 10 A/g. The demonstrated design rule combining morphological and structural engineering strategies sheds light on the development of advanced electrodes for high performance potassium-based energy storage devices.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2020
·
IF 7.632
Xiujing Lin,Tingting Zhang,Chengcheng Chu,Zhuang Li,Ruiqing Liu,Pan Li,Yi Li,Zhendong Huang,Yanwen Ma
Lithium–oxygen (Li–O2) batteries, profiting by their super high theoretical energy density and oxygen-breathing electrodes, have attracted extensive concern. The synthesis of the electrode materials with high conductivity and promising cycling durability will be a critical aspect for Li–O2 batteries. In this article, a hybrid composite of CoS2 nanocages derived from ZIF-67 and interconnected by carbon nanotubes (CoS2/CNTs) is prepared and used in the air electrode fabrication for Li–O2 batteries. A reversible capacity of 2398.9 mAh g–1 is obtained, equivalent to 90% of the discharge capacity. When restricting the cycling capacity to 500 mAh g–1, the battery exhibits cycling stability for 52 cycles, with the cutoff potential keeping above 2.0 V. The key point of this material is the formation of porous CoS2 nanocages and insertion of the nanocages with CNTs, forming interconnected electrically conducting networks. The incorporation of CNTs serves as channels for fast electron transfer, which overcomes the poor conductivity of CoS2. Furthermore, the porous CoS2 nanocages could provide affluent active sites for an oxygen reduction reaction (ORR) and oxygen evolution reaction (OER), which also facilitates the diffusion of O2 and the infiltration of electrolytes. The combination of highly conductive CNTs and CoS2 with efficient catalytic activity renders improvement in the battery performance.
研究领域:
材料科学
·
储能
·
电化学
·
纳米材料
·
电池技术
✓ 已验证
DOI
高影响因子
ACS Applied Energy Materials
·
2023
·
IF 6.4
Yuanchu Zhu,Jing Yao,Lina Bai,Wenchao Zhang,Wei Wang,Xinzhi Ma,Lili Wu
Molybdenum disulfide (MoS2) is considered as a promising electrochemical catalyst for hydrogen generation. However, insufficient exposed active sites and poor conductivity severely impede its large-scale applications. Herein, the heterogeneous MoS2/CoS2 electrocatalyst was grown in situ on carbon cloth. The synergistic interaction between CoS2 and MoS2 occurring at the dense heterointerfaces grants the hybrid higher catalytic activities than single components, thereby speeding up hydrogen production rates. After annealing, the composite exhibits an ultralow overpotential of 67 mV at 10 mA cm–2 and a small Tafel slope of 70 mV dec–1 in 1 M KOH due to the improved conductivity and intimate connection between MoS2 and CoS2. Furthermore, it maintains an excellent cycle durability of 65 h without obvious attenuation at 20 mA cm–2. In-situ shielding tests reveal the main active sites coming from MoS2 rather than CoS2. On the basis of experimental measurements and theoretical calculations, CoS2 should work as the electron donor in the HER process and improve not only H2O adsorption but also H2 emission behaviors. The excellent hydrogen evolution performance of annealed-MoS2/CoS2/CC composite indicates that the present design is a prospective option for developing low-cost and efficient HER electrocatalysts in alkaline electrolytes.
研究领域:
材料科学
·
电化学
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
Frontiers of Optoelectronics
·
2022
·Vol. 15
·期 1
·1-9
·
IF 0
Zhou Xingwei,Zhang Wei,Zhang Zunhao,Wang Zizhun,Zou Xu,Li Dabing,Zheng Weitao
The oriented two-dimensional porous nitrogen-doped carbon embedded with CoS 2 and MoS 2 nanosheets is a highly efficient bifunctional electrocatalyst. The hierarchical structure ensures fast mass transfer capacity in improving the electrocatalytic activity. And the greatly increased specific surface area is beneficial to expose more electrocatalytically active atoms. For oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) tests in 1 mol/L KOH solution, only 194 and 140 mV overpotential are required to achieve a current density of 10 mA/cm 2 , respectively. Our research provides an effective strategy for synergizing the individual components in nanostructures for a wide range of electrocatalytic reactions. Graphical Abstract
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2024
·
IF 11.2
Zhenxin Zhao,Zonglin Yi,Rong Niu,Jiajun Chen,Rajesh Pathak,Yongzhen Wang,Jeffrey W Elam,Xiaomin Wang
While neutral aqueous metal batteries, featuring cost-effectiveness and non-flammability, hold significant potential for large-scale energy storage, their practical application is hampered by the limited specific capacity of cathode materials (less than 500 mAh g −1 ). Herein, capacity-oriented CoS 2 and rate-optimized Co 9 S 8 cathodes are developed based on the aqueous copper ion system. The charge-storage mechanism is systematically investigated through a series of ex-situ tests and density functional theory calculations, focusing on the reversible transitions of Co 9 S 8 →Cu 7 S 4 →Cu 9 S 5 /Cu 1.8 S and CoS 2 →Cu 7 S 4 →Cu 2 S, which are associated with the redox reactions of Cu 2+ /Cu + ‖Co 2+ /Co and Cu 2+ /Cu + ‖S 2 2− /S 2− , respectively. The electrochemical results show that CoS 2 can exhibit a superior capacity of 619 mAh g −1 at 1 A g −1 after 400 cycles, while Co 9 S 8 maintains an outstanding rate performance of 497 mAh g −1 at 10 A g −1 (the retention rate is 95% compared to 521 mAh g −1 at 1 A g −1 ). As a proof of concept, an advanced CoS 2 //Zn hybrid aqueous battery demonstrates a working voltage of 1.20 V and a specific energy of 663 Wh kg cathode −1 . This work provides an alternative direction for developing sulfide cathodes in energetic aqueous metal batteries.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 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）