ENERGY & FUELS
·
2022
·
IF 4.654
Weijun Zhang,Fen Li,Zhinan Fu,Sheng Dai,Fenghongkang Pan,Jinxia Li,Lihui Zhou
The appearance of mixed-metal MOF materials with abundant metal active sites, high porosity, large surface area, and, particularly, the synergistic effect between different metals which show prominent catalytic activity for oxygen evolution reaction (OER) has motivated profound research. Most of the related reports focus on the hydrothermal methods to prepare the mixed-metal MOFs containing metal ions such as Co, Ni, and Cr, etc. In this work, we proposed a facile impregnation method through an ion-exchange process to fabricate Fe-doped Co-BDC nanosheets (Fe@Co-BDC NSs) that represented significant enhancement for electrocatalytic OER. The tuning mechanism of the ion-exchange method was investigated by the morphology change and electronic structure of Fe@Co-BDC NSs, which should be important for an efficient OER catalyst. The optimized Fe@Co-BDC NSs (5 mM, 60 min) exhibited a significantly lower overpotential of 307 mV with a smaller Tafel slope of 34.1 mV·dec–1, as compared with the pure Co-BDC NSs.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Duo Xu,Chenchangxiang Wang,Xiaochen Hu,Qiming Sun,Weigao Zhong,Qiangli lv,Haoran Guo,Hua Wang,Zhouhang Li,Kongzhai Li,Zhishan Li
The oxygen evolution reaction (OER) plays a crucial role in hydrogen production, but its potential is limited by the lack of scalable and stable electrocatalysts for industrial applications. In this study, we developed a repeated impregnation-drying co-precipitation (RIP) method to prepare CoFe-based OER electrocatalysts. We found that the optimized FeCo(OOH) x -5/NF catalyst achieves an overpotential of 340 mV at 500 mA cm −2 , significantly outperforming catalysts prepared via hydrothermal or chemical bath deposition methods. The RIP method accelerates the co-precipitation rate of metal ions and helps repair defects between the catalytic layer and the nickel foam substrate, promoting the three-dimensional growth of the catalyst layer. Notably, the entire reaction occurs in air, and the solution can be reused, ensuring the optimal utilization of all ions. Additionally, the FeCo(OOH) x -5/NF catalyst was scaled up to 6000 cm 2 to assess the feasibility of roll-to-roll industrial production. In practical alkaline water electrolysis, electrolyzers equipped with FeCo(OOH) x -5&RANEY Nickel catalysts demonstrated excellent performance, achieving 500 mA cm −2 at 1.75 V in 6.0 M KOH. This work provides valuable insights into the design of efficient alkaline OER electrocatalysts, such as FeCo(OOH) x /NF, for promising industrial applications.
研究领域:
化学工程
·
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Energy Storage Materials
·
2025
·
IF 20.2
Gaige Zhang,Changchun Ye,Tan Li,Shumin Liu,Wei-Hsiang Huang,Zhaoxi Chen,Xiaochao Ren,Jiajin Lin,Jin Yang,Yongcai Qiu,Guangxu Chen
Repurposing spent battery materials into electrocatalysts offers a dual-functional strategy to mitigate environmental burdens and create value-added products. However, developing efficient conversion methods to transform spent cathodes into high-activity, cost-effective catalysts remains a critical challenge. Here, we report a Fe-doped LCO/Co 3 O 4 heterogeneous interface catalyst (Fe-LCO/Co 3 O 4 ) synthesized by quenching the calcinated spent LiCoO 2 (SLCO) in the Fe 3+ solution for promoting the performance of the oxygen evolution reaction (OER). Fe-LCO/Co 3 O 4 features outstanding OER activity, including a low overpotential of 312 mV at 10 mA cm −2 , a Tafel slope of 34 mV dec −1 , and remarkable stability exceeding 1000 h, better than the majority of cobalt-based electrocatalysts. Experimental results and density functional theory reveal that Fe ions coupled with LCO/Co 3 O 4 heterostructures alter the adsorption configuration of *OH and *O, optimizing binding capabilities and effectively reducing the rate-determining step of *OOH dehydrogenation energy barrier, thereby accelerating the OER. This study introduces a novel strategy for the sustainable reuse of spent cathode materials, providing insights into the rational design of high-performance OER electrocatalysts.
研究领域:
材料科学
·
电化学
·
环境科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2020
·
IF 16.683
Lei Chen,Yiming Xu,Zhi Yang,Kun Zhang,Baoliang Chen
Developing a low-cost co-catalyst for hydrogen evolution reaction (HER) on a photocatalyst is a great challenge. An open-framework material, cobalt ethylenediammonium bis(sulfate) tetrahydrate, was initially used as an efficient co-catalyst to improve photocatalytic HER of g-C 3 N 4 . The unique open‐framework cobalt(II) sulfate (Co-S) lead to twice higher H 2 evolution performance (10328.9 μmol g −1 h -1 ) compared to noble metal (Pt)-decorated g-C 3 N 4 photocatalyst under simulated sunlight. The open network structure provides abundant active sites and excellent electron transport properties, properties and then promotes electron-hole separation, which play a synergistic role with g-C 3 N 4 in the photocatalytic process. The loading of Co-S significantly changes the microenvironment of the catalyst surface of g-C 3 N 4 and enhances its hydrophilicity, which benefits the release of the produced gas on the catalyst surface. The formation of the Co(Ⅰ) species in the open-framework material by the electron reduction of Co(Ⅱ) is proposed as a vital role in the extraordinary HER process.
研究领域:
材料科学
·
催化化学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Yanfei Li,Yuanyuan Fu,Wenbin Liu,Yonghai Song,Li Wang
A novel hollow Co-Co 3 O 4 coated with carbon nanotubes (CNTs) nanostructure was designed. Here, zeolite imidazolate framework-67 cubes were used as sacrificial template and carbonized under H 2 /Ar atmosphere along with in-situ growth of CNTs to form Co nanostructures@CNTs. Then the Co nanostructures@CNTs was treated by thermal-oxidation under air to further construct hollow Co-Co 3 O 4 @CNTs. The obtained hollow Co-Co 3 O 4 @CNTs was characterized by scanning electron microscopy, transmission electron microscopy , N 2 adsorption/desorption isotherms, X-ray powder diffraction, X-ray photoelectron spectroscopy and electrochemical techniques . It was found that the hollow Co-Co 3 O 4 @CNTs cubes were wrapped by lots of CNTs. As it was used as anode materials for lithium ion batteries (LIBs), after cycling 200 cycles at 0.2 A g −1 , the reversible capacity was still kept at 806.7 mA h g −1 . Excellent cycle stability and Li + storage capacity originated from the hollow nanostructures and the encapsulation of CNTs around hollow Co-Co 3 O 4 cubes to buffer the volume change of Co 3 O 4 and improve the electrical conductivity . Meanwhile, the increased specific surface area could effectively improve the storage of Li + . Therefore, the hollow Co-Co 3 O 4 @CNTs might have potential application in LIBs.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Peng-Fei Qiu,Xiu-Niang Tan,Zai-Yin Huang,Yan Zhou
The low conductivity of many traditional metal–organic-framework (MOF)-based electrode limits their developments in the field of electrochemical energy storage and still of great challenge. The controllable preparation of various kinds of nanomaterials using thiol-functionalized MOF shows great prospects. In this work, a thiol-functionalized metal–organic framework sheet structure ( Co-MOF/NF ) on nickel foam was successfully prepared by in situ interfacial growth synthesis, which was transformed into its derivatives S-doped β-Co(OH) 2 nanoflowers Co-x/NF ( x = 1, 2 and 6) in different concentrations of KOH solutions through ion etching/exchange reaction. The pristine thiol-functionalized Co-MOF/NF and its derivatives Co-x/NF ( x = 1, 2 and 6) nanoflower-like arrays could be used as positive electrode materials for effective supercapacitors. Among them, the transformation of the nanoflower-like Co-1/NF electrode exhibits excellent electrochemical properties with high areal capacitance (1925 ± 23 mF/cm 2 at 1 mA/cm 2 ), good rate performance, excellent conductivity and decent cycling stability. The Co-1//AC ASC device provides a high energy density of 0.176 mWh/cm 2 (92.6 Wh/kg) at a power density of 0.745 mW/cm 2 (392.1 W/kg). And this Co-1//AC ASC device exhibits a good cycling stability and practical application in energy storage field. This study provides a new strategy for the pristine thiol-functionalized MOF and its conversion nanostructures for energy storage applications.
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
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Ning Zhao,Qiyi Ma,Yanfu Wei,Shun Wang,Xuemin Zhong,Guanzheng Zhuang,Peng Yuan
Due to the low valence band maximum value, Co 3 O 4 is an outstanding catalyst, but its utilization in adsorption needs to be addressed. In this study, we proposed a novel method for loading aggregation-prone Co 3 O 4 onto sepiolite (Sep) to facilitate tetracycline (TC) adsorption. The XRD, TEM, and FTIR analyses demonstrated that the highly dispersed Co 3 O 4 was successfully anchored on the sepiolite grooves via the Si-OH on the sepiolite surface’s grooves to the cobalt site in Co 3 O 4 . We firstly proposed a view of how metal oxide aggregates are confined to the grooves on the surface of sepiolite (via Si-OH at the edges of the grooves on the sepiolite surface). The ultra-high sorption capacity of Co 3 O 4 -Sep is 219.53 mg/g for TC, which is three times that of Sep (70.75 mg/g) and Co 3 O 4 (85.29 mg/g). The kinetic and isotherm results fitting suggested that the adsorption of TC on Co 3 O 4 -Sep mainly contributed to the multilayer chemisorption adsorption process. Thermodynamic investigations revealed the spontaneous endothermic reaction of TC adsorption on Co 3 O 4 -Sep. Co 3 O 4 strengthened the complexation between the composite and functional groups of TC, significantly increasing TC adsorption capacity. In addition, the Co 3 O 4 -Sep retained an extraordinary adsorption capacity with the presence of competing ions, at strongly acidic and alkaline pH values and after three cycles. Therefore, this study offers new perspectives on applying cobalt-based materials and demonstrates the potential for antibiotic adsorption in the prepared composites.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
ACS Catalysis
·
2021
·
IF 13.084
Nosheen Zafar,Sining Yun,Menglong Sun,Jing Shi,Asim Arshad,Yongwei Zhang,Zhanbo Wu
The development of cost-effective electrocatalysts is a key challenge for facilitating advanced electrochemical energy-conversion technologies. In this study, transition metals (niobium, bismuth, and molybdenum)-/cobalt-assisted nitrogen-doped carbon electrocatalysts with a unique rhombic dodecahedron structure were fabricated via pyrolysis of the Co-metal organic framework. Solar cells fabricated using the Mo/Co–N–C counter electrode (CE) exhibited a significantly higher power conversion efficiency (PCE) of 7.98%, while the cells with Nb/Co–N–C and Bi/Co–N–C CE catalysts attained PCEs of 7.46 and 7.65%, respectively, much enhanced than that of the Pt-based photovoltaic cell (7.10%). This robust behavior was mainly attributed to the synergistic effect between the bimetallic active sites (Nb/Co, Bi/Co, and Mo/Co) and the nitrogen-doped carbon network, which resulted in a pronounced decrease in the charge-transfer resistance and superior device stability. Furthermore, the catalytic mechanism of these catalysts was investigated by the general strategy based on the surface adsorption of iodine atoms with the CE, work function, and electronic structure of the as-prepared nanohybrids, using first-principles density functional theory. The calculated adsorption energy and bond lengths were −0.82 eV and 3.05 Å for Co–N–C, −0.91 eV and 3.22 Å for Nb/Co–N–C, −1.00 eV and 3.28 Å for Bi/Co–N–C, and −1.20 eV and 3.46 Å for Mo/Co–N–C, respectively. The density-of-states calculation predicted the metallic behavior of the as-prepared samples, and Bader charge analysis revealed that the development of uneven potential on the material surfaces with the addition of transition metals increases their polarities and the ability to adsorb I3– ions on the CE surface, which enhances the credibility of these catalysts. In addition, the enhanced value of the calculated work function also indicates their superior catalytic behavior and fast electron transfer mechanism for the triiodide reduction reaction. This work opens an era for the rational design of incorporated transition-metal/Co electrocatalysts with nitrogen-doped carbon networks for advanced energy devices in catalytic fields.
研究领域:
材料科学
·
能源技术
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
Science China-Technological Sciences
·
2025
·Vol. 68
·期 6
·1-17
·
IF 4.9
Guo Sijia,Tian Xikun,Yan Jun,Shang Chaolin,Zhao Changying
Thermochemical energy storage (TCES) under direct irradiation mode is a promising technology that promotes the widespread utilization of high-temperature concentrated solar energy. However, poor cyclic stability and solar absorption for calcium carbonates, high cost for cobalt oxides, and safety issues for powder-form materials hinder the practical applications of the TCES systems. This work innovatively proposed a compressed reactive TCES unit composed of 10%-volume of modified Co 3 O 4 in the center and 90%-volume of modified CaCO 3 around the center. The modified calcium-based compacted material (CaCO 3 M-p) exhibits 20.5°C lower onset temperature, 13.9 kJ mol −1 lower activation energy, and faster kinetics than the commercial CaCO 3 powder (CaCO 3 -u) in the energy storage process. Both the cyclic stability in 15 cycles and solar absorption of the CaCO 3 M-p are boosted, which are 1.25 times and 18.3 times those of the CaCO 3 -u, respectively. While compaction reduces the reactive performances by narrowing the porous, the Mn/Mg co-modification has a more significant effect in increasing the above properties by creating lattice defects and introducing impurities. The modified cobalt-based compacted material (Co 3 O 4 M2-p) presents similar reactive and optical properties as raw Co 3 O 4 powder, yet it elevates the average conversion rate in 30 cycles to 1.75 times that of compressed raw Co 3 O 4 . Modification by microcrystalline cellulose is the key to this improvement, as it reduces activation energy and promotes decomposition kinetics for compacted Co-based materials. The compressed reactive TCES unit demonstrates outstanding energy storage density and power. The 10%-volume Co 3 O 4 improves external radiation absorption and reinforces internal heat transfer, enhancing the unit’s energy storage rate. Moreover, Co 3 O 4 also contributes to energy density, raising the total density to 0.4217 MWh m −3 , exceeding the 0.2468 MWh m −3 limit of CaCO 3 powder. The compacted materials and composite unit advance the practical use of TCES in solar energy storage.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
ChemSusChem
·
2019
·Vol. 12
·期 12
·2755-2762
·
IF 7.804
Yangxing Liu,Miao Wang,Yunwei Li,Gang Yuan,Xiangwen Zhang,Qingfa Wang
Graphical On the edge : The incorporation of Fe into Co-based (oxy)hydroxide materials leads to not only enhanced intrinsic reactivity of each active site, which is attributed to the strong electronic interaction between Co and Fe, but also changes in the number of edge/defect sites. Fe-doped transition metal (oxy)hydroxides are regarded as the most efficient oxygen evolution reaction (OER) electrocatalysts in alkaline conditions. The incorporation of Fe effectively enhances the OER activity of Co-/Ni-based materials, but the corresponding role of Fe in Co-based (oxy)hydroxide materials still remains unresolved. Herein, α-Co 1− m Fe m (OH) x is synthesized and systematically engineered to study the effect of Fe content on the morphology, crystalline structure, electronic structure, and OER activity. As the Fe content is changed, the basic crystalline phase of α-Co 1− m Fe m (OH) x is consistent whereas the micromorphology changes. Much smaller and thinner nanoplates with more edge/defect sites are fabricated because of increased Fe incorporation. When the Fe content is more than 0.1, twin nanoparticles emerge at the edge/defect sites of the sister nanoplate. Additionally, the OER activity of α-Co 1− m Fe m (OH) x against Fe content can be plotted as a volcano curve. These data thus support a hypothesis that the edge/defect sites in α-Co 1− m Fe m (OH) x are responsible for the OER performance. The incorporation of Fe leads to not only the accelerated intrinsic reactivity of each active site, which is attributed to the strong electronic interaction between Co and Fe but also changes the number of edge/defect sites.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2019
·
IF 3.218
Bingbing Liu,Xiaoya Wang,Yunyun Zhai,Zulei Zhang,Haiqing Liu,Lei Li,Herui Wen
Due to its nano-thickness, fast mass transfer and excellent electron transfer capability, two-dimensional (2D) MOF are an efficient strategy to develop good electrocatalytic materials. In this paper, 2D-MOF were synthesized by facile and cost-efficient methods. MOF can be fast prepared with nucleation and crystal growth in several minutes at room temperature , leading to very thin 2D Co-MOF. Herein, Co, Ni and NiCo-based 2D MOF as non-enzymatic H 2 O 2 sensors at different oxidation potentials in KOH solution, the Co-MOF exhibited excellent H 2 O 2 oxidation and detection performance including a wide linear range from 0.5 μM to 832.5 μM, low detection limit of 0.69 μM, and very fast sensing response in basic solution. By taking advantage of excellent conductivity, the Co-MOF showed the low oxidation potential for H 2 O 2 and good detection performance at 0.25 V. It was comparable to most carbon materials and reported MOF materials for H 2 O 2 detection. We insist that 2D MOF is effective for creating active catalysts. The 2D Co-MOF performed higher electrochemical sensitivity with high stability, conductivity, and selectivity. It indicates 2D MOF has potential employment in the fabrication of sensing devices.
研究领域:
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2020
·
IF 4.939
Lin Li,Shuiyun Shen,Xiaolin Li,Liuxuan Luo,Guanghua Wei,Junliang Zhang
It remains urgent to make continuous efforts on well-designed and highly active non-precious metal (NPM) electrocatalysts for the cathodic oxygen reduction reaction (ORR) in proton exchange membrane fuel cells (PEMFCs), thus helping greatly reduce the fuel cell cost. Due to an unsatisfied stability caused by Fenton reaction for Fe-based materials, Co-based materials bear much more expectations as one type of NPM electrocatalysts to be applied in the ORR. Here we report a novel strategy to synthesize a series of mesoporous nitrogen-doped carbon-supported cobalt electrocatalysts (Co-DCD-CA), which takes full advantage of electrostatic interaction between carboxyl in citric acid (CA) and amidogen in dicyandiamide (DCD) as well as chelating interaction between citric acid and cobalt cation . When CA is employed as carbon source, the optimal derivative of the Co-DCD-2-CA-900 electrocatalyst exhibits a higher ORR activity with a half-wave potential at 0.75 V, which is 60 mV higher than that prepared using Ketjenblack EC 300 J (Co-DCD-2-EC-900) as the carbon support. Besides, the effects of pyrolysis temperature as well as DCD to CA ratio on the ORR activity are detailedly investigated.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）