CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Qun Li,Qingze Jiao,Yu Yan,Huanjun Li,Wei Zhou,Tingting Gu,Xueran Shen,Chengxing Lu,Yun Zhao,Yaoyuan Zhang,Hansheng Li,Caihong Feng
The sluggish kinetics and severe volume expansion are two major drawbacks that limiting the application of transition metal sulfides electrode materials for sodium ion batteries (SIBs). Herein, we assembled Ti 3 C 2 T x MXene nanosheets into thin-walled hollow spheres with PMMA spheres as sacrificial template, on which MOF-derived CoS 2 nanoparticles embedded in N-doped carbon were grown (MXene@CoS 2 /NC). The MXene@CoS 2 /NC exhibits state-of-the-art sodium ion storage properties, including a high reversible capacity of 620 mAh g −1 at 0.2 A g −1 , superior rate capability (394 mAh g −1 at 5 A g −1 ), and excellent cycling stability (355 mAh g −1 after 5000 cycles). The corresponding electrochemical tests prove that the MXene@CoS 2 /NC has fast Na + ion diffusion and electron transfer compared with its counterpart without MXene interfaces. XPS and XANES characterizations disclose the introduced MXene and increased pyrrolic N can weaken the Co-S bonds of CoS 2 , which facilitates the conversion reaction between CoS 2 and Na 2 S, and thus improves the sodium storage kinetics. The DFT calculations also demonstrate the MXene can improve the conductivity of electrode materials by fast interfacial electron transfer. In addition, the MXene hollow spheres and MOF-derived NC provide host structures for CoS 2 , which can increase the contact between electrolyte and active materials, buffer the volume expansion of CoS 2 , and thus enhancing the electrochemical stability. This work provides a feasible strategy to construct anode materials for SIBs with improved sodium storage kinetics and cycling stability.
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高影响因子
ChemCatChem
·
2020
·Vol. 12
·期 18
·4618-4624
·
IF 4.853
Ying Zhang,Guojing Hu,Jing Li,Xingqun Zhu,Ping Liu,Bin Xiang
Searching a low-cost and excellent performance catalyst for hydrogen evolution reaction (HER) is important for enhancing the efficiency of water splitting. In this manuscript, we report the Co, S co-doped carbon-framework supported MoO 2 nanosheets (Co, S/MoO 2 −C) for HER. The carbon-framework improves the distribution of the MoO 2 , which causes a large number of exposed active sites. The synergistic effect of Co and S enhances the electron transport of the MoO 2 . As a result, the Co, S/MoO 2 −C exhibits a low overpotential (62 mV vs . RHE) and enhanced stability in 1 M KOH for HER. Our work puts forward a novel method to improve the catalytic performance of MoO 2 and provides a new option to prepare excellent catalysts. Graphical Synergistic effect : The Co, S co-doped carbon-framework supported MoO 2 (Co, S/MoO 2 −C) catalyst is prepared by hydrothermal reaction and vulcanization. The carbon-framework improves the distribution of the MoO 2 , which causes a large number of exposed active sites. The synergistic effect of Co and S enhances the electron transport of the MoO 2 . Therefore, the Co, S/MoO 2 −C exhibits a low overpotential (62 mV vs . RHE) in 1 M KOH for HER.
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Advanced Materials Interfaces
·
2022
·Vol. 9
·期 9
·2102474
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IF 6.389
Yu Dong,Yueheng Qi,Wenqing Zhao,Shaohui Yuan,Zihao Zeng,Yue Yang,Wei Sun,Peng Ge
As potential candidates, metal sulfides display strong storage abilities but suffer from serious volume swelling and polysulfide shuttling. Especially rich-sulfur materials, inferior reversible conversion reactions (from MS 2 to MS with S) can bring about major formation of sulfur. Herein, cubic-like Sn–Co–S materials with SnO 2 as catalyst are designed with various dimensional carbon. The as-resulted samples display uniform distributed particle size (≈5 µm), while cross-linked Sn–Co–S@carbon is successfully formed due to its rich surficial groups. Significantly, the formation of chemical bonds about Sn/Co–S–C is noted, facilitating ions/e-transfering and architecture enhancing. Meanwhile, owing to the endothermic effect of carbon, SnO 2 finally resulted, effectively limiting the so-called “shuttling effect” of polysulfide. Utilized as sodium-ion anodes, the optimized samples can deliver a capacity of 490 mAh g −1 at 0.5 A g −1 and ≈400 mAh g −1 above at 5.0 A g −1 . Assisted by the detailed kinetic analysis, it can be confirmed that the improvements of surface-controlling behaviors mainly come from the interfacial chemical bonds and strong-polar metal-oxides bonds. This work is expected to illustrate the roles of interfacial design and metal oxide catalysts for advanced energy storage materials.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Yongkun Liu,Guohua Jiang,Bo Yu,Uwamahoro Evariste,Pianpian Ma
Herein, the phosphorus-substituted nickel cobalt sulfides nanosheet arrays growth on nitrogen doped carbonic nanofibers (donated as Ni–Co–S–P) are prepared by an electrodeposition method. The morphologies and chemical composition of Ni–Co–S–P are investigated by SEM, TEM, XPS and EDS . The electrochemical properties of Ni–Co–S–P are tested by CV , GCD and EIS technologies. And the sample Ni–Co–S–P-4 displays the most outstanding electrochemical properties including electrocatalytic activity, rate capability and specific capacitance. In addition, the iron oxide nanosheets growth on N-CNFs (Fe–O/N-CNFs) are prepared by the same electrodepositing route. And they can serve as a negative electrode according to the electrochemical performances analysis. A hybrid supercapacitor based on the obtained electrodes is further assembled by using Fe–O/N-CNFs as negative electrode and Ni–Co–S–P as positive electrode. The as-fabricated hybrid supercapacitor show outstanding energy storage performance, it possesses a high energy density at 55.8 Wh·kg −1 corresponding to a power density at 402.9 W kg −1 .
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Journal of Materials Chemistry A
·
2024
·Vol. 12
·期 16
·9871-9885
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IF 10.7
Longyan Chen,Pengkun Zhang,Dong-Hau Kuo,Jianmei Jiang,Binghong Wu,Zhengjie Su,Osman Ahmed Zelekew,Jinguo Lin,Dongfang Lu,Xiaoyun Chen
Herein, we demonstrate a Co/S doped TiO2 bimetal sulfur oxide nanoparticle catalyst (labeled CoTiOS) with heterovalent Co states and abundant oxygen vacancy (Ov) defects for the photocatalytic nitrogen reduction reaction (PNRR) in an ambient environment. Co/S co-doping converted TiO2 into a catalyst for visible light photocatalytic nitrogen fixation. The incorporation of Co endows TiO2 with better electrical conductivity and electron trapping ability. The introduction of sulfur adjusts the amount of Ov and Co3+/Co2+ ratio. Ov acts as an active site for trapping H2O and activating H2O to generate a proton for the N2 reduction reaction. Active atoms Co3+ were exposed and activated for N2, and electrons hopping between Co2+ and Co3+ enhanced electron transfer. CoTiOS-3 with appropriate Co/S doping has abundant Ov, suitable heterovalent Co3+/Co2+ ratios, higher surface active sites, smaller crystal sizes, higher specific surface area (SBET), and fast transfer of electrons, and it exhibited a super PNRR activity of 491.56 μmol g−1 h−1, an apparent quantum efficiency (AQE) of 1.89% at 420 nm and a solar-to-ammonia (STA) conversion efficiency of 0.083% in pure water under AM1.5G light irradiation. It also exhibited excellent stability and persistence and shows potential for photocatalytic nitrogen fixation.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Bo Yu,Guohua Jiang,Wangcong Xu,Cong Cao,Yongkun Liu,Na Lei,Uwamahoro Evariste,Pianpian Ma
The NiMoO 4 /CoMoO 4 nanorod arrays wrapped by Ni-Co-S nanosheets were successfully grown on the surface of carbon cloth (NCMOS@CC) by combining of hydrothermal and electrochemical deposition methods. And the as-prepared NCMOS@CC showed good flexibility. The obtained NCMOS@CC as electrode materials were tested in a three-electrode system, showing a pretty good specific capacitance of 778.1 F g −1 at a current density of 0.5 A g −1 and excellent rate capability using 1 M KOH as the electrolyte. The flexible asymmetric supercapacitors (FASCs) were further fabricated using NCMOS@CC as the positive electrode and activated carbon@carbon cloth (AC@CC) as the negative electrode. The fabricated FASCs exhibited a safe working range with a potential window of 0–1.6 V with a maximum energy density of 33.1 Wh Kg −1 at 0.25 A g −1 and maximum power density of 3195 W kg −1 at 4 A g −1 . The fabricated FASCs even bent at different angles still showed good flexibility and stable electrochemical properties . These performances enable the NCMOS@CC to be one of the potential flexible electrodes for using in flexible energy storage devices.
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Materials Science and Engineering B-Advanced Functional Solid-State Materials
·
2024
·
IF 3.9
Wenhui Xiong,Zijie Cai,Zihao Wang,Zhongkai Wu,Wencen Mei,Zhizheng Wu,Dingbang Liu,Shiming Yang,Weiping Zhou,Zhenzhi Cheng,Jun Wang,Guangsheng Luo
Multivariate transition metal sulfides and porous nanosheet architectures hold promising potential for applications for the energy-related application. Nevertheless, the addition of polymer binders and conductive agents can adversely affect their electrochemical performance. In this work, we present self-assembled Ni-Co sulfide nanosheet arrays growing on foamed Ni (Ni-Co-S@NF). Ni-Co-S@NF electrode materials are synthesized through the complete sulfidation of interconnected ultrathin nanosheets derived from NiCo layered double hydroxides. The highly conductive nickel foam facilitates electron transfer while the 3D network structure promotes electrolyte diffusion and penetration. Hence, porous Ni-Co-S@NF materials presents the excellent specific capacitance as 1286.6C g −1 in 1 A g −1 and retained 70 % of its original capacity over 5000 charge–discharge cycles. Furthermore, we assemble an asymmetric supercapacitor used active carbon as negative-electrode material and Ni-Co-S@NF as positive-electrode material. This device delivers the specific energy is 74.0 Wh kg −1 and specific power of 850.0 W kg −1 .
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Small
·
2025
·
IF 12.1
Lijuan Liu,Yingqiu Zheng,Wenshu Chen,Yongping Du,Linfeng Hu,Guoqiang Luo,Qiang Shen,Jian Zhang
Alkaline water electrolysis holds potential for large-scale, high-purity hydrogen production. However, the slow kinetics of water dissociation and challenging conditions in alkaline environments complicate the search for an electrocatalyst with both high activity and durability. In this study, a highly active and stable amorphous electrocatalyst is introduced, 3Ni─Co─S─O, developed via a straightforward electrodeposition method for alkaline hydrogen evolution reaction (HER). Notably, the surface of the 3Ni─Co─S─O catalyst undergoes a compositional reconstruction during alkaline HER, yet maintains its amorphous structure. This reconstruction spans roughly 6 µm, leading to a gradual decrease in Ni and S content and a corresponding increase in O concentration toward the surface, thereby forming a stable, gradient active layer. Benefitting from this layer and its amorphous nature, the 3Ni─Co─S─O catalyst demonstrates superior alkaline HER activity—requiring only 170 mV to achieve an industrial HER current density of 1000 mA cm −2 . It also showcases remarkable stability, with a mere 15 mV increase in overpotential during continuous HER at 300 mA cm −2 for 24 h, outperforming the commercial Pt/C catalyst. The research provides a novel approach to designing high-performance amorphous alkaline HER electrocatalysts cost-effectively and contributes insights for understanding and developing advanced amorphous catalysts across various applications.
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PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2020
·
IF 7.632
Lu Chen,Li−Li Cui,Zizhun Wang,Xingquan He,Wei Zhang,Tewodros Asefa
Efficient, durable, nonprecious metal-based catalysts for electrochemical reactions involving oxygen are needed to advance the widespread use of fuel cells and Zn-air batteries. In this work, hybrid materials composed of bimetallic (Co and Fe) sulfide (Co8FeS8) nanoparticles supported on N,S-doped carbon microparticles that can serve as dual-function oxygen electrocatalysts are synthesized. The synthesis of the materials is performed by preparing and then pyrolyzing silica-protected Fe- and Co-modified, S-containing polyphthalocyanine at different temperatures. The materials are named (Fe,Co)SPPc-T-sp, where T denotes the pyrolysis temperature and sp represents the silica protection applied for their synthesis. Among them, the material synthesized at 900 °C, denoted (Fe,Co)SPPc-900-sp, shows superb electrocatalytic activities in an alkaline solution both toward the oxygen reduction reaction (ORR), with a half-wave potential (E1/2) of 0.830 V vs RHE, and toward the oxygen evolution reaction (OER), with a current density of 10 mA cm–2 at an overpotential (η10) of 353 mV. The catalytic activities of this material for both reactions are comparable with those of the respective benchmark, precious-metal-based catalysts, namely, Pt/C (20 wt %) and RuO2, respectively. An alkaline Zn-air battery assembled using (Fe,Co)SPPc-900-sp as an air electrode delivers a high peak power density (158.6 mW cm–2) and outstanding charge–discharge cycling stability (for over 50 h). These catalytic performances are better than those of the corresponding battery containing Pt/C and RuO2 electrocatalysts. This work also offers a facile synthetic strategy for the fabrication of robust, inexpensive dual-function electrocatalysts for Zn-air batteries.
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ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Xing Yu,Weiwei Zhang,Lu Liu,Yves Fautrelle,Xionggang Lu,Xi Li
The abundant mass and charge transfer involved in Faradaic redox reactions are largely determined by microstructures including the surface area and porosity, elemental composition and electrical conductivity of bimetallic sulfides. Here, a high magnetic field (HMF) was introduced to tune these intrinsic characters for superior supercapacitor electrodes. We developed a novel HMF-controlled anion-exchange methodology to prepare the one-dimensional (1D) bunched Zn–Co–S yolk–shell balls (ZCS6T BYSBs). The HMF-induced directional growth and alignment of Zn0.76Co0.24S drive the directional 1D assembly. The as-obtained ZCS6T BYSBs possess larger surface area/pore volume, higher crystallinity and electrical conductivity, richer electroactive elements, and favorable axial electron and ion transport because of HMF-enhanced favorable ion diffusion and exchange kinetics. Flexible S, N codoped carbon nanotubes/graphene films embedded with the ZCS6T BYSBs (CZS6T/CNTs/SNGS) were fabricated by vacuum filtration and one-step S, N codoping and reduction of graphene oxides to improve structural stability and charge transport. The CZS6T/CNTs/SNGS electrode displayed impressive enhanced specific capacitance and rate capability with 78.7% capacitance retention at 30 A g–1. Furthermore, the CZS6T/CNTs/SNGS//CNTs/SNGS asymmetric supercapacitor delivered remarkable cycling stability with a high energy density of 41.1 W h kg–1 at a large power density of 9022 W kg–1.
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PubMed
高影响因子
Catalysis Science & Technology
·
2025
·
IF 4.2
Mingkang Zhang,Jingwei Wu,Haolin Yang,Xiaohan Wang,Zebao Rui,Junfei Chen
Selective catalytic reduction of nitrogen oxides with methane (CH4-SCR) is an effective way to simultaneously eliminate NOx and CH4 emissions. Development of efficient CH4-SCR reaction system with high NOx reduction activity and selectivity is highly desirable for its commercial application. Herein, a two-part relay reaction system, including sequentially Co@S-1 and In-Ce/H-Beta catalysts, is designed for boosting CH4-SCR. In this system, the Co@S-1 with high redox ability boosts NO oxidation to NO2 and generates key intermediate CH3NO2 that can partially be in situ oxidized and the excessive can migrate to In-Ce/H-Beta. Meanwhile, the inner synergistic effect between InO+ and CeO2 species on In-Ce/H-Beta not only exhibits fair CH4-SCR performance, also facilitates the formation of NO- 3 species to react with the migrated CH3NO2 from Co@S-1. Benefiting from the combination between outer active sites synergy and inner active sites synergy, the simultaneous efficient conversion of NOx (T50 = 380 ℃) and CH4 (T50 = 425 ℃) with well durability is achieved.
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Journal of Water Process Engineering
·
2024
·
IF 6.3
Pengkun Zhang,Haoyu Wang,Yujie Lai,Yunzhuo Xu,Longyan Chen,Qinhan Wu,Dong-Hau Kuo,Dongfang Lu,Mengistu Tadesse Mosisa,Jiqing Li,Jinguo Lin,Xiaoyun Chen
The rising accumulation of pollutants, including heavy metals and toxic organics, necessitates effective environmental remediation to protect health and biological systems. In this study, a cubic cerianite CeO 2 -like Co/S co-doped CeO 2 sulfur-oxide catalyst (labeled as CeCoOS) with super catalytic reduction performance of pollutants with NaBH 4 as a reducing agent under dark was prepared via a green and facile preparation method. Transition metal Co 2+ -cation and S 2− -anion co-doped CeO 2 adjusted the energy bandgap and introduced oxygen vacancy (Vo), which converted Ce 4+ around Vo into Ce 3+ to maintain electric neutrality. The heterovalent Ce 4+ /Ce 3+ states in Co/S-CeO 2 enhance the electron lifetime and facilitate fast electron transfer . The valence transition between Ce 4+ /Ce 3+ and Vo make the Co/S co-doped in CeO 2 catalyst increase its electrochemically active surface sites and accelerate the pollutants reduction reaction. The CeCoOS-3 with Co/S dopants has an excellent catalytic reduction activity to completely reduce 20 ppm toxic 4-NP in 10 min, 50 ppm organic dyes of MB, RhB, and MO in 6 min, and 50 ppm heavy metal Cr 6+ in 10 min. The CeCoOS-3 sulfur-oxide catalyst also exhibited excellent stability in the reusability test. Therefore, CeCoOS sulfur-oxide catalysts are expected to be used for dye decolorization, detoxification of organic toxins, and reduction of electroplating wastewater.
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