ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
Yan Cui,Chunwu Zhou,Xinze Li,Yuan Gao,Jian Zhang
Development of non-noble-metal electrocatalysts with high activity and durability is a competitive strategy for the practical applications of water splitting which including hydrogen evolution reaction (HER) as well as oxygen evolution reaction (OER). In this work, high-quality CoS 2 ultrathin nanosheets were synthesized through a simple and efficient hydrothermal method . After merging 10% wt Ni, the bimetal catalyst (Co 0.9 Ni 0.1 S 2 ) displays excellent catalytic activity (10 mA cm −2 at an overpotential of 156 mV and a small Tafel slope of 52 mV dec −1 ) as well as stability (over 3000 cycles without obvious decay) in acid condition. Based on the results of Density Functional Theory (DFT) calculations, H + adsorbed competition, hydrogen formation energetic and kinetics are proposed to help us understand the high efficient HER process over the Co 0.9 Ni 0.1 S 2 (CNS) ultrathin nanosheets .
研究领域:
材料科学
·
能源化学
·
理论计算
✓ 已验证
DOI
高影响因子
Journal of Energy Storage
·
2024
·
IF 8.9
Xianwei Li,Yuhua Xie,Yazhou Chen,Zehui Yang,Fang Luo
The battery performance associated with longevity are the priorities for the industrialization of rechargeable zinc air battery (ZAB). Herein, we have reported the construction of WN-CoS 2 heterostructure enveloped by nitrogen and phosphorus co-doped carbon nanotubes (WN-CoS 2 @NPCNT). WN-CoS 2 @NPCNT performs a superior oxygen evolution reaction (OER) catalytic activity of 279 mV overpotential to reach 10 mA cm −2 , lowered by 85 mV with relative to CoS 2 @NCNT attributing to the heterostructure efficiently modulating the electronic structure of active sites. Besides, the half-wave potential reaches 0.875 V vs. RHE for WN-CoS 2 @NPCNT under oxygen reduction reaction (ORR) condition, corresponding to a 3.2-time higher kinetic current density compared to commercial Pt/C. Due to the exceptional bifunctionality, the battery performance is 205 mW cm −2 for WN-CoS 2 @NPCNT, 1.54 times higher than commercial counterpart, Pt/C + IrO 2 . Impressively, the battery performance sustains for 1000 h for WN-CoS 2 @NPCNT stemming from the confinement effect caused by NPCNT. In addition, the all-solid-state ZAB shows a high-power density of 55 mW cm −2 .
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
Nano Energy
·
2025
·
IF 17.1
Huanchi Chen,Yuxuan Zhang,Gang Zhao,Bingzhe Jia,Xinming Wu
Transition metal sulfides exhibit excellent energy density and specific capacitance in redox enhanced supercapacitors. However, the phenomenon of rapid self-discharge limits their large-scale development. In this study, we have analyzed an innovative and simple preparation of polydopamine (PDA) coated CoS 2 @MoS 2 @CC for redox enhanced supercapacitors applications. Considering the suppression the self-discharge of supercapacitors while also improving electrochemical performance of electrode. Subsequently, the densities of states, differential charges and adsorption energies of the PDA@CoS 2 @MoS 2 @CC and CoS 2 @MoS 2 @CC electrodes were calculated by using density functional theory (DFT) to investigate the mechanism of the effect of polydopamine on the performance of supercapacitors. PDA@CoS 2 @MoS 2 @CC electrode reveals a large specific capacitance (3520.45 mF cm −2 ) and outstanding cycling stability (92.75 % capacity maintenance after 10,000 cycles at 1 mA cm −2 ). This is because of the strong interaction between the PDA coating and K + , while K + are adsorbed in the PDA@CoS 2 @MoS 2 @CC electrode with high adsorption energy (-2.59 eV). It is convenient for the storage of K + . Therefore supercapacitors assembled with PDA@CoS 2 @MoS 2 @CC electrode also exhibit excellent performance (specific capacitance, energy density and power density are 511.85 mF cm −2 , 0.74 Wh cm −2 and 1.53 W cm −2 at 0.5 mA cm −2 ). It is important to investigate the self-discharge performance of the supercapacitor constructed by PDA@CoS 2 @MoS 2 @CC. Notably, the voltage of this device decreases to 0.73 V after 20000 s (initial potential is 1.7 V), which is better than the device assembled by CoS 2 @MoS 2 @CC (0.6 V after 20000 s). Further, the leakage current of this device is also less than the device assembled by CoS 2 @MoS 2 @CC at 1.7 V (0.05 mA vs 0.08 mA). This effective self-discharge suppression strategy is due to the free radical/singlet oxygen scavenging properties of PDA, which limits the parasitic Faraday reaction induced by diffusion-controlled, thus mitigating self-discharge.
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
ACS Sustainable Chemistry & Engineering
·
2019
·
IF 6.97
Mancong Li,Yongteng Qian,Jimin Du,Haoran Wu,Linyu Zhang,Gang Li,Kaidi Li,Weimin Wang,Dae Joon Kang
The design and fabrication of eco-friendly, highly efficient, and non-noble-metal-based catalysts are demanding challenges in energy-conversion technologies. Herein, we successfully synthesized CuS nanosheets decorated with CoS2 nanoparticles through a facile route. The optimized 3% CoS2-7% CuS catalysts exhibited remarkable electrocatalytic performance, with excellent cyclic stability at all pH values for the hydrogen evolution reaction (HER). They exhibited lower Tafel slopes (46, 52, and 59 mV dec–1) and smaller overpotentials (62, 85, and 106 mV) at 10 mA cm–2 in 0.5 M H2SO4, 1 M KOH, and 0.5 phosphate buffer aqueous solutions, respectively, than other CoS2/CuS, pure CoS2, and pure CuS catalysts. We attribute their high electrocatalytic performance to their unique heterostructure and the synergistic effects between the constituent metal sulfides that provides a large interfacial contact area, numerous charge-transfer pathways, as well as abundant surface reaction active sites, enhancing the charge-carrier transfer during the HER activity.
研究领域:
材料科学
·
能源转换技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Ran Sui,Guangtao Zan,Ming Wen,Weina Li,Zihui Liu,Qingsheng Wu,YongQing Fu
Transition metal sulfides and oxides with high theoretical capacities have been regarded as promising anode candidates for a sodium-ion battery (SIB); however, they have critical issues including sluggish electrochemical kinetics and poor long-term stability. Herein, a dual carbon design strategy is proposed to integrate with highly active heterojunctions to overcome the above issues. In this new design, CoS2/CoO hollow dodecahedron heterojunctions are sandwiched between open framework carbon-spheres (OFCs) and a reduced graphene oxide (rGO) nanomembrane (OFC@CoS2/CoO@rGO). The CoS2/CoO heterojunctions effectively promote electron transfer on their surface and provide more electrochemical active sites through their hierarchical hollow structures assembled by nanodots. Meanwhile, the dual-carbon framework forms a highly conductive network that enables a better rate capability. More importantly, the dual carbon can greatly buffer volume expansion and stable reaction interfaces of electrode material during the charge/discharge process. Benefitting from their synergistical effects, the OFC@CoS2/CoO@rGO electrode achieves a high reversible capacity of 460 mAh g–1 at 0.05 A g–1 and still maintains 205.3 mAh g–1 even when current density is increased by 200 times when used as an anode material for SIBs. Their cycling property is also remarkable with a maintained capacity of 161 mAh g–1 after 3500 charging/discharging cycles at a high current density of 1 A g–1. The dual-carbon strategy is demonstrated to be effective for enhanced reaction kinetics and long-term cycling property, providing siginificant guidance for preparing other high-performance electrode materials.
研究领域:
材料科学
·
能源存储
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Can Zhou,Xintao Ma,Guijing Liu,Junjie Ding,Zhiqiang Lv,Xiao Li,Beibei Zhang,Zhenglong Yang,Wenlong Xu
CoS 2 exhibits abundant redox reactions , high theoretical capacity, excellent, mechanical properties, and is regarded as a prospective electrode material. However, rational design of CoS 2 composites with high capacity and ultra-long cycle life remains a major challenge. In this work, we formed CoS 2 /rGO/CNT electrode materials by compositing reduced graphene oxide (rGO), carbon nanotubes (CNT) and CoS 2 with a three-dimensional interwoven network. The elemental composition and three-dimensional network morphology were described using SEM, TEM, XRD , Raman, BET, TGA and XPS. The large loading area provided by the three-dimensional network for Li + facilitates the effective diffusion of Li + during the cycling process. In addition, the three-dimensional network acts as an adhesion substrate for CoS 2 nanoparticles , mitigating the bulk change and reducing the aggregation of CoS 2 nanoparticles. On the other hand, the tight bonding of CNT with CoS 2 /rGO facilitates fast transfer of electron in CoS 2 /rGO/CNT. The electrochemical measurement results show that after 1000 cycles, the capacity is 615.8 mAh/g at 2000 mA/g and can still reach 233.7 mAh/g at 5000 mA/g after 2000 cycles. The favorable electrochemical properties prove that CoS 2 /rGO/CNT is an excellent anode material for long-life lithium-ion batteries.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Xuyan Qin,Wutao Wei,Ximin Ling,Changwei Shan,Zhao Liu,Mingjie Song,Zhikai Wang,Xi Jia,Liwei Mi
The design of a simple and safe method for constructing heterojunction structures in nanocomposites is a promising strategy for the manufacture of high-performance electrochemical energy storage devices. In this paper, based on the “less-liquid” reaction system and the assistance of the generated NaCl, a heterojunction-containing zero-dimensional (0 D) CoS2/NiS2 nanocomposite with particle sizes ranging from 50 to 200 nm were prepared. During this reaction, the reactant carries crystalline water to provide a liquid environment. Similarly, the lattice occupation of the generated NaCl promotes the construction of a large number of heterogeneous structures inside the nanostructured materials. The prepared material was subsequently employed as a cathode material for the Mg2+/Li+ hybrid battery (MLHB). The interface effect of the heterostructures induces an electric field within the nanocrystals, resulting in a lower ion diffusion resistance, and facilitating interfacial electron transport. Therefore, the heterojunctions accelerated the diffusion dynamics at the interface, and increased the charge-transfer rate. Mg2+ and Li+ exhibit reversible synergistic effects. More specifically, at a current density of 0.2 A g–1, the initial discharge specific capacity was 785.5 mAh g–1, while at a current density of 0.5 A g–1, a discharge specific capacity of 317.54 mAh g–1 was maintained over 200 cycles. And the Coulombic efficiency was maintained at ∼99.8%. This simple and safe design method for nanoscale heterogeneous materials provides a method for developing high-performance MLHB cathode materials.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Changdi Wang,Tingting Ji,Wenqian Luan,Dong Yao,Ruiyang Zhao,Jishu Han,Lei Wang
The high efficient utilization of light absorption and the effective separation of photogenerated carriers are critical factors in enhancing the performance of photocatalysts. In this study, CoNi-layered double hydroxide was synthesized using zeolitic imidazolate frameworks-67 as a template, followed by calcination to form CoS 2 /NiS 2 . Subsequently, ReS 2 was deposited onto the surface of CoS 2 /NiS 2 , resulting in the ReS 2 /CoS 2 /NiS 2 photocatalyst demonstrated notable hydrogen evolution activity under visible light, achieving a maximum hydrogen production rate of 40111.8 μmol/g. The construction of the Z-scheme heterojunction was found to facilitate the transfer and separation of photogenerated carriers while extending the lifetime of photogenerated electrons, thereby contributing to the enhancement of photocatalytic activity. This study provides a new approach for the development of sulfide heterojunctions aimed at improving photocatalytic hydrogen production efficiency.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Small
·
2023
·
IF 13.3
Zizhuang He,Hanxiao Xu,Lingzi Shi,Xiangru Ren,Jie Kong,Panbo Liu
The synergistic effect of hollow cavities and multiple hetero-interfaces displays huge advantages in achieving lightweight and high-efficient electromagnetic wave absorption, but still confronts huge challenges. Herein, hierarchical Co 2 P/CoS 2 @C@MoS 2 composites via the self-sacrificed strategy and a subsequent hydrothermal method have been successfully synthesized. Specifically, ZIF-67 cores first act as the structural template to form core-shell ZIF-67@poly(cyclotriphosphazene-co-4,4′-sulfonyldiphenol) (ZIF-67@PZS) composites, which are converted into hollow Co 2 P@C shells with micro-mesoporous characteristics because of the gradient structural stabilities and preferred coordination ability. The deposition of hierarchical MoS 2 results in phase transition (Co 2 P→Co 2 P/CoS 2 ), yielding the formation of hierarchical Co 2 P/CoS 2 @C@MoS 2 composites with hollow cavities and multiple hetero-interfaces. Benefiting from the cooperative advantages of hollow structure, extra N,P,S-doped sources, lattice defects/vacancies, diverse incoherent interfaces, and hierarchical configurations, the composites deliver superior electromagnetic wave capability (−56.6 dB) and wideband absorption bandwidth (8.96 GHz) with 20 wt.% filler loading. This study provides a reliable and facile strategy for the precise construction of superior electromagnetic wave absorbents with efficient absorption attenuation.
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
CARBON
·
2021
·
IF 9.594
Yuanyuan Li,Lixue Gai,Guilin Song,Qingda An,Zuoyi Xiao,Shangru Zhai
CoS 2 /Cu 2 S embedded N/S co-doped mesh-like carbonaceous composites with enhanced electromagnetic wave absorbing performance was successfully prepared using carboxymethyl cellulose hydrogel spheres as starting materials by freeze-drying and high-temperature carbonization , in which thiourea as a source of N/S was favorably achieved. This newly designed three-dimensional mesh-like structures embedded with CoS 2 and Cu 2 S nanoparticles was confirmed by various techniques, while the N/S co-doped carbonaceous matrix, would contribute to the enhancement of electron transport , interfacial polarization , dipole polarization, ferromagnetic resonance, and magnetic coupling . This unique three-dimensional mesh structure facilitates multiple reflections and scattering of electromagnetic waves within the single matrix. By adjusting the dosage ratio between components and the filling amount of filler, the composite material exhibited a good impedance matching, which promotes the synergy between conductive loss, dielectric loss, and magnetic loss, and improves the electromagnetic wave loss. When the composite is filled with 25 wt%, there is a minimum reflection loss value of −51.68 dB at 5.20 GHz, and when the coating thickness is 4.5 mm, the effective absorption bandwidth is 3.84 GHz when the coating thickness reaches 2.0 mm. The experimental results illustrated that the synthesized composites might be alternative materials for low-frequency band electromagnetic wave absorption.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
ChemElectroChem
·
2019
·Vol. 6
·期 14
·3764-3773
·
IF 3.975
Hui Liu,Hao Guo,Liguo Yue,Ning Wu,Qi Li,Wenqin Yao,Rui Xue,Mingyue Wang,Wu Yang
Graphical Turn the red light on : A series of NiS 2 /CoS 2 /NC- T composited is developed by carbonizing and sulfuring a binary precursor of Ni/Co-metal-organic framework. The composite NiS 2 /CoS 2 /NC-500 maintains the rod-like structure of the precursor and exhibits a high specific capacitance. An assembled asymmetric supercapacitor (ASC) NiS 2 /CoS 2 /NC-500//AC displays a high energy density and good cycle stability with high capacitance retention. A red LED can be illuminated by the assembled ASC. Transition metal sulfides derived from metal-organic frameworks (MOFs) have received increasing attention as a potential energy storage electrode material. Here, a series of NiS 2 /CoS 2 /NC- T ( T =temperature) have been successfully constructed by carbonizing and sulfuring the precursor of Ni/Co-MOF. It is worth emphasizing that N-doped carbon materials improve the conductivity of the electrode material. Moreover, NiS 2 /CoS 2 /NC-500 maintains the rod-like structure of the precursor and exhibits a high specific capacitance of 1325 F g −1 at a current density of 1 A g −1 . Apart from high capacitance, the NiS 2 /CoS 2 /NC-500 also demonstrated excellent cycling stability with retention rate of 75 % after 5000 cycles at a current density of 5 A g −1 . The good performance could be attributed to the unique rod-like structure and pore-size distribution of NiS 2 /CoS 2 /NC-500. Moreover, an assembled asymmetric supercapacitor NiS 2 /CoS 2 /NC-500//AC displays a high energy density of 53.93 Wh kg −1 at a power density of 800 W kg −1 and good cycle stability with capacitance retention of 85.71 % after 20,000 cycles at 5 A g −1 . In particular, a red LED can be illuminated by the assembled ASC, indicating that as-synthesized NiS 2 /CoS 2 /NC-500 hold great potential for practical applications.
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
CHINESE JOURNAL OF CATALYSIS
·
2025
·
IF 17.7
Yang Zhang,Nengneng Xu,Bingbing Gong,Xiaoxiao Ye,Yi Yang,Zhaodi Wang,Biyan Zhuang,Min Wang,Woochul Yang,Guicheng Liu,Joong Kee Lee,Jinli Qiao
Storing solar energy in battery systems is crucial to achieving a green and sustainable society. However, the efficient development of photo-enhanced zinc-air batteries (ZABs) is limited by the rapid recombination of photogenerated carriers on the photocathode. In this work, the visible-light-driven CoS 2 /CuS@CNT-C 3 N 4 photocatalyst with unique petal-like layer structure was designed and developed, which can be used as air electrode for visible-light-driven ZABs. The superior performance of ZABs assembled by CoS 2 /CuS@CNT-C 3 N 4 was mainly attributed to the successful construction of Schottky heterojunction between g-C 3 N 4 and carbon nanotubes (CNTs), which accelerates the transfer of electrons from g-C 3 N 4 to CoS 2 /CuS cocatalysts, improves the carrier separation ability, and extends the carrier lifetime. Thereinto, the visible-driven ZABs assembled by CoS 2 /CuS@CNT-C 3 N 4 photocatalyst has a power density of 588.90 mW cm –2 and a charge-discharge cycle of 643 h under visible light irradiation, which is the highest performance ever reported for photo-enhanced ZABs. More importantly, the charge-discharge voltage drop of ZABs was only 0.54 V under visible light irradiation, which is significantly lower than the voltage drop (0.94 V) in the dark. This study provides a new idea for designing efficient and stable visible-light-driven ZABs cathode catalysts.
研究领域:
材料科学
·
能源技术
·
光催化
✓ 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）