JOURNAL OF MATERIALS RESEARCH
·
2019
·Vol. 34
·期 14
·2445-2455
·
IF 1.982
Uwamahoro Evariste,Guohua Jiang,Bo Yu,Yongkun Liu,Zheng Huang,Qiuling Lu,Pianpian Ma
In this work, hierarchical mesoporous Zn–Ni–Co–S–rGO/NF microspheres have been prepared by hydrothermal, sulfurization, and subsequent calcination process. The effect of different sulfurization time on the morphology and capacitance of composites was tested. The high electrochemical performance of (Zn–Ni–Co–S–rGO/NF) composite was obtained when the sulfurization time was 3 h (Zn–Ni–Co–S–rGO/NF-3h), where a specific capacitance of 627.7 F/g at 0.25 A/g and excellent rate capability of about 97.8% capacitance retention at 2 A/g after 4000 cycles were achieved. Moreover, an asymmetric supercapacitor fabricated by (Zn–Ni–Co–S–rGO/NF-3h) composite and activated carbon (AC) as the positive and the negative electrodes, respectively, showed a high energy density of 75.96 W h/kg at a power density of 362.49 W/kg with a remarkable cycle stability performance of 91.2% capacitance retention over 5000 cycles. This incredible electrochemical behavior illustrates that the hierarchical mesoporous Zn–Ni–Co–S–rGO/N-3h microsphere electrodes are promising electrode materials for application in high-performance supercapacitors.
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高影响因子
POLYHEDRON
·
2018
·
IF 2.067
Dejuan Fa,Mao Zhou,Hui Zhao,Yiwei Jiang,Yuqing Miao
The 3D flower-like Ni–Co–S was synthesized by a typical hydrothermal method in the presence of urea and thioacetamide. As comparison, the urchin-like Ni–Co–O was prepared in the absence of thioacetamide. The former processed higher electrocatalytic activity for methanol oxidation than the latter. Ni–Co–S exhibited the anodic peak current density of 19.23 mA/cm 2 for methanol oxidation, far higher than Ni–Co–O. It also showed the Tafel slopes of 57 mV/dec, much lower than Ni–Co–O. The BET results showed that the surface area and pore volume are 96.373 m 2 /g and 0.367 cm 3 /g for the flower-like Ni–Co–S, which is higher than 88.736 m 2 /g and 0.224 cm 3 /g for the urchin-like Ni–Co–O. As a result, the flower-like Ni–Co–S possessed more electroactive sites for methanol oxidation. The superhydrophobicity of the flower-like Ni–Co–S helps for the formation of micro air film on the surface of flower petals. Such a tri-phase interface of Ni–Co–S solid, reaction solution and air film may help for the electrocatalytic oxidation of Ni–Co–S toward methanol oxidation since the produced CO 2 can leave the surface of Ni–Co–S quickly and enter into solution phase due to the presence of air film and high solubility of CO 2 in aqueous solution.
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SYNTHETIC METALS
·
2017
·
IF 2.435
Hongxiu Dai,Pengfei Cao,Duo Chen,Yuan Li,Nan Wang,Houyi Ma,Meng Lin
A nickel-cobalt-sulfide nanosheet (Ni-Co-S NS)/polypyrrole nanowire (PPy NW) core/shell-structured composites on nickel foam (NF) was synthesized by facile electrodeposition processes for electrochemical non-enzymatic glucose sensor. PPy NWs grew on the NF substrate by a potentiostatic deposition method, and then the PPy NWs were further served as skeletons for electrodeposition Ni-Co-S nanosheets. The ternary Ni-Co-S NSs as the shell and PPy NWs as the core on the flexible NF constructed the 3D micro/nano structure. The as-prepared Ni-Co-S/PPy/NF electrode was characterized by scanning electron microscopy (SEM) and energy-dispersive X-ray spectrometer (EDS). The electrochemical sensor was used for the detection of glucose by chronoamperometry. The introduction of the interconnected Ni-Co-S NSs can provide accessible pathways for electrolyte and have high sensitivity to glucose. Compared with the NF and PPy/NF electrodes, the Ni-Co-S/PPy/NF micro/nanohybrid electrode exhibited higher catalytic activity towards electro-oxidation of glucose. The developed Ni-Co-S/PPy/NF electrode showed two linear electrochemical responses to glucose in the range from 2 μM to 140 μM with a correlation coefficient of R 2 = 0.937 and 0.14 mM to 2 mM with a correlation coefficient R 2 = 0.978, and the detection limit is 0.82 μM. Furthermore, the prepared biosensor demonstrated high selectivity to glucose in the presence of uric acid, ascorbic acid and D-fructose.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Yongkun Liu,Qiuling Lu,Zheng Huang,Shiqing Sun,Bo Yu,Uwamahoro Evariste,Guohua Jiang,Juming Yao
In this work, a novel flexible electrode material for supercapacitor is prepared by electrodeposition of Ni-Co-S interconnected nanosheet arrays on N-doped hierarchical porous carbon nanofibers (Ni-Co-S@N-pCNFs). The electrode exhibits a remarkable specific capacitance of 520.2 F g -1 at the current density of 0.2 A g −1 and 670 F g -1 at 2 mV s −1 . The activated charcoal (AC) loaded N-doped porous carbon nanofibers (AC@N-pCNFs) as electrode is also prepared which exhibits a specific capacitance of 257.2 F g -1 at 0.2 A g −1 , as well as excellent cycling stability with a capacitance retention of 92.6% after 5000 cycles. Furthermore, the Ni-Co-S@N-pCNFs as the positive electrode , active carbon loaded N-doped hierarchical porous carbon nanofibers (AC@N-pCNFs) as negative electrode , and KOH/NKK hybrids as both the electrolyte and separator are assembled into flexible asymmetric supercapacitor . The assembled supercapacitor device without using any current collectors or binders shows a high energy density of 21.6 Wh·kg −1 at a power density of 134.9 W kg −1 and robust long-term cycling stability retaining over 90.0% after 3000 cycles at 1.0 A g −1 . The as-assembled asymmetric supercapacitors (ASCs) have an outstanding mechanical flexibility and electrochemical stability and no significant attenuation occurred during cycling under different bending states.
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高影响因子
CHINESE CHEMICAL LETTERS
·
2021
·Vol. 33
·期 6
·3272-3276
·
IF 6.779
Na Li,Guangmeng Qu,Xixi Zhang,Shunshun Zhao,Chenggang Wang,Gang Zhao,Peiyu Hou,Xijin Xu
The selection and development of cathode of alkaline zinc batteries (AZBs) is still hindered and often leads to poor rate capability and short cycle life. Here, amorphous hollow nickel-cobalt-based sulfides nanocages with nanosheet arrays (AM-NCS) are designed and constructed with ZIF-67 as the self-template to exchange with Ni 2+ and S 2− by using a two-step ion exchange method. The synthesized AM-NCS possess the high specific capacity (160 mAh/g at 2 A/g), and the assembled battery has excellent rate performance (146 mAh/g reversible capacity at 5 A/g). The assembled device has excellent rate performance (155 mAh/g at 2 A/g) and long cycling stability (7000 cycles, 62.5% of initial capacity). The excellent electrochemical properties of the electrode materials are mainly attributed to the unique structure, in particular, polyhedron structure with hollow structure can improve the cyclic stability, and the amorphous structure can expose more reactive sites on the surfaces of nickel, cobalt and sulfur. This work provides a new strategy for the design and fabrication of high performance cathode materials for AZBs.
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高影响因子
DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 23
·7869-7875
·
IF 4
Deling Wang,Lu Chen,Yuzhou Xia,Ruowen Liang,Xiyao Liu,Shaoming Ying,Guiyang Yan
Developing novel photocatalysts with an intimate interface and sufficient contact is significant for the separation and migration of photogenerated carriers. In this work, a novel Co@NC/ZnIn2S4 heterojunction with a strong Co–S chemical bond was formed at the interface between Co@NC and ZnIn2S4, which accelerated charge separation. Meanwhile, the recombination of the electron–hole pairs was further restricted by the Co@NC/ZnIn2S4 Schottky junction. The Co@NC (5 wt%)/ZnIn2S4 composite exhibited an H2 evolution rate of 33.3 μmol h−1, which is 6.1 times higher than that of the pristine ZnIn2S4, and Co@NC/ZnIn2S4 showed excellent stability in the photocatalytic water splitting reaction. Its apparent quantum yield reached 38% at 420 nm. Furthermore, the Kelvin probe test results showed that the interfacial electric field formed as the driving force for interface charge transfer was oriented from Co@NC to ZnIn2S4. In addition, the Co–S bond as a high-speed channel facilitated the interfacial electron transfer. This work reveals that in situ formed chemical bonds will pave the way for designing high-efficiency heterojunction photocatalysts.
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PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Jin Liang,Tian Lei,YaXi Zhang,Ye Yuan,Guang Yang,Li Zhang
Metal–organic frameworks (MOFs) have gained widespread recognition as versatile catalyst precursors owing to their unique structural merits and straightforward synthetic accessibility. Herein, the UiO-66(Ce)/ZIF-67 composite MOF precursor was constructed through a hybridization strategy, and subsequently transformed into a nonprecious metal sulfide catalyst (denoted as CeS/CoSx) employing hydrothermal sulfidation. Benefiting from the CeS/CoSx architecturally engineered hollow polyhedral nanocage structure and strong electronic interaction between CeS and CoSx, the composite catalyst demonstrates significantly accelerated electron transfer kinetics and outstanding catalytic activity. In 1.0 M KOH, CeS/CoSx only necessitates an overpotential of 143 mV to achieve a current density of 10 mA cm–2 for the hydrogen evolution reaction (HER). Regarding the oxygen evolution reaction (OER), overpotentials of 250 and 291 mV were required to attain current densities of 10 and 50 mA cm–2, respectively. Remarkably, the assembled CeS/CoSx||CeS/CoSx two-electrode overall water splitting system requires only 1.60 V to achieve a current density of 10 mA cm–2. Moreover, during the 40 h continuous electrolysis test, the potential fluctuation remained within 1%. This study provides an effective strategy for designing high-performance, dual-MOF-derived sulfide composite bifunctional electrocatalysts.
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PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Yumeng Lian,Yi Wang,Dun Zhang,Likun Xu
Developing a stable and reusable material for antibacterial application in an enzyme-like system is still a challenge. Herein, Mn–Co–S–Se (MnCo 2 S x Se 4–x )/Ni foam (NF) are synthesized by introducing S 2– and Se 2– in MnCo 2 O 4 /NF with a facile hydrothermal approach. With the different molar ratios of S/Se, the surface morphology of MnCo 2 S x Se 4–x /NF shows different growth and the catalytic activity also presents regular changes. MnCo 2 S 3.1 Se 0.9 /NF possesses a high enzyme-like ability with higher V max than natural horseradish peroxidase . Due to the outstanding peroxidase-like activity, MnCo 2 S 3.1 Se 0.9 /NF also exhibits broad-spectrum bactericidal performance towards Escherichia coli and Staphylococcus aureus which stems from the formation of ·O 2 – from H 2 O 2 . In the reutilization experiment, the enzyme-like activity keeps a stable value after 25 cyclic tests and the bactericidal performance is still stable after 10 cyclic tests, proving that MnCo 2 S 3.1 Se 0.9 /NF possesses relative stability and reusability. This research showed the great prospect of new energy and environmental catalysis.
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高影响因子
IONICS
·
2025
·
IF 2.6
Mise Youpo,Wang Shaohua,Shi Wen,Yin Yakun,An Juan,Zhou Xuejiao,Xia Wentang,Yang Wenqiang
This study presents a green strategy for synthesizing amorphous cobalt sulfide (Co–S) bifunctional electrocatalysts via a choline chloride–ethylene glycol deep eutectic solvent (DES) under ambient conditions, addressing ionic coordination dynamics and defect engineering for enhanced solid–state ionic/electronic transport in energy conversion. By modulating the equilibrium between Co 2+ and S₂O₃ 2- ions in Ethaline, we fabricated monodisperse Co–150S nanoparticles (~ 78 nm) with tailored sulfur content (S/Co = 1.9), an amorphous architecture, and abundant oxygen vacancies. These structural features synergistically optimized ionic diffusion pathways and electronic conductivity, achieving exceptional hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) activities in alkaline media. The Co–150S/NF electrode demonstrated a volcano-like sulfur-dependent activity profile, achieving the highest electrochemically active surface area (ECSA, 3.7 cm 2 ) and ultralow overpotentials of − 105 mV (HER) and 277 mV (OER) at 10 mA cm⁻ 2 , comparable to benchmark Pt/C and RuO₂ catalysts. Post-electrolysis characterization revealed dynamic structural reorganization during HER and OER operations, involving over 80 at% sulfur depletion and the formation of metastable Co-rich phases that maintained catalytic functionality. In overall water splitting, the system required only 1.62 V to drive 10 mA cm⁻ 2 with minimal activity decay (1.5 mV h⁻ 1 over 26 h). Mechanistic investigations revealed that sulfur incorporation initiates a multiscale optimization process: (i) DES–mediated ionic confinement prevents particle aggregation, promoting uniform nanosphere formation; (ii) modulation of the electronic structure through nonstoichiometric Co–S coordination; and (iii) defect engineering through the enrichment of oxygen vacancies. This study provides insights into ionic coordination mechanisms in non–aqueous solvents and defect–mediated ion transport in amorphous solids, suggesting a potential strategy for developing electrocatalysts applicable to related energy storage technologies.
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高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Liuyun Chen,Xinling Xie,Tongming Su,Hongbing Ji,Zuzeng Qin
Photocatalytic hydrogen production from water splitting production is a promising strategy to solve the energy crisis and environmental pollution. In the present work, Co 3 O 4 /CdS composites were prepared by ultrasonication and stirring, and used for photocatalytic water splitting. The results showed a Co-S chemical bonds were formed at the interfaces between the Co 3 O 4 and the CdS, which promoted the charge transfer rate between the CdS and Co 3 O 4 . Meanwhile, the recombination of the electron-hole pairs was further restrained by the Co 3 O 4 /CdS p-n heterojunction. The 10%-Co 3 O 4 /CdS composites exhibited an excellent photocatalytic hydrogen production rate of 142.62 μmol∙h −1 , which was 20 times higher than that of CdS (6.85 μmol∙h −1 ), and the Co 3 O 4 /CdS showed excellent stability in the photocatalytic water splitting reaction. Moreover, a formation process of Co 3 O 4 /CdS p-n heterojunction and a mechanism of Co 3 O 4 /CdS p-n heterojunction avoiding the recombination of photocatalytic electrons and holes to enhance photocatalytic activity was proposed.
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高影响因子
ACS Applied Energy Materials
·
2025
·
IF 5.5
Wen Huang,Jiawei Zhang,Guoqiang Deng,Guang Zhu,Yaohui Chen,Chenxi Xu,Jigui Cheng
Anion exchange membrane fuel cells (AEMFCs) have emerged as a promising clean energy technology due to their high efficiency and the potential to eliminate the reliance on precious metal catalysts for the oxygen reduction reaction (ORR) at the cathode. Developing highly efficient nonprecious metal catalysts is crucial for enhancing AEMFC performance. In this study, we report a Co–S–N–C@MXene catalyst through sulfur doping and support loading. This catalyst demonstrates exceptional ORR activity, achieving a half-wave potential (E1/2) of 0.881 V. After 10,000 cycles of cyclic voltammetry (CV) testing, the E1/2 showed a minimal decline of only 14 mV, demonstrating excellent durability. Moreover, the AEMFC based on the catalyst achieved a peak power density of 466 mW cm–2.
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高影响因子
Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 37
·19757-19768
·
IF 14.511
Min Lu,Li An,Jie Yin,Jing Jin,Rui Yang,Bolong Huang,Yang Hu,Yong-Qing Zhao,Pinxian Xi
The electrochemical oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) are key electrochemical processes in metal–air batteries and water splitting devices. Aluminium–air batteries, as an important type of metal–air battery, have been considered to be promising power candidates for flexible electronics. Here, we describe electronically engineered amorphous Fe–Co–S sites embedded in Prussian blue analogue (FeCoSx-PBA) hetero-nanoframes. The experimental results and DFT calculations reveal the critical role of the introduced FeCoSx layer to PBA, which enhances the electron transfer and alleviates the overbinding effect of OH* during the OER. The FeCoSx-PBA hybrid system supplies an optimized electronic structure for the alkaline OER, which is also confirmed by the much-lowered overpotential (266 mV at 10 mA cm−2) for the alkaline OER. Furthermore, a flexible Al–air battery based on an FeCoSx-PBA cathode catalyst exhibits a high peak power density (58.3 mW cm−2) and energy density (1483 W h kgAl−1), and outstanding stability for more than 50 h of operation under bending or stretching conditions, demonstrating its potential in the practical application of flexible electronic devices. Our results may provide a new strategy of modulating the electronic structure of air electrode catalysts to efficiently promote the reactivity of alkaline OER and Al–air battery processes.
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高影响因子
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