JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Xiaoya Fan,Chaoqun Ma,Donglin Zhao,Zhiqin Deng,Longcheng Zhang,Yan Wang,Yongsong Luo,Dongdong Zheng,Tingshuai Li,Jing Zhang,Shengjun Sun,Qipeng Lu,Xuping Sun
Electrochemical nitrate (NO 3 − ) reduction reaction (NO 3 RR) possesses two-pronged properties for sustainable ammonia (NH 3 ) synthesis and mitigating NO 3 − contamination in water. However, the sluggish kinetics for the direct eight-electron NO 3 − -to-NH 3 conversion makes a formidable challenge to develop efficient electrocatalysts. Herein, we report a heterostructure of Co 3 O 4 nanosheets decorated TiO 2 nanobelt array on titanium plate (Co 3 O 4 @TiO 2 /TP) as an efficient NO 3 RR electrocatalyst. Both experimental and density theory calculations reveal that the heterostructure of Co 3 O 4 @TiO 2 establishes a built-in electric field which can optimize the electron migration kinetics, as well as facilitate the adsorption and fixation of NO 3 − on the electrode surface, ensuring the selectivity to NH 3 . As expected, the designed Co 3 O 4 @TiO 2 /TP exhibits a remarkable Faradaic efficiency of 93.1 % and a remarkable NH 3 yield as high as 875 μmol h −1 cm −2 , superior to Co 3 O 4 /TP and TiO 2 /TP. Significantly, it also demonstrates strong electrochemical durability.
研究领域:
材料科学
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环境科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CRYSTENGCOMM
·
2016
·Vol. 18
·期 42
·8253-8261
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IF 3.849
Kun Ding,Xiao Zhang,Ping Yang,Xin Cheng
The controlled synthesis of multifarious nanostructures is valuable for understanding the properties associated with the surface structure and for exploring potential applications. Herein, various morphological Co3O4 precursors were synthesized hydrothermally for fabricating mesoporous Co3O4 nanostructures. Importantly, the morphology, size, and crystalline phase of precursors were independently tuned by controlling the components in solution (e.g. anions, cations, and hydrolysis agents). The microstructure of Co3O4 precursors has obviously changed from porous hexagons to nanoneedles by changing the anions in solution. After calcination, as-prepared precursors were converted into mesoporous Co3O4 nanostructures, and their morphology and size were well preserved. The effect of experimental conditions on the growth of Co3O4 precursors was explored, and the corresponding growth mechanism was proposed. Moreover, the electrochemical properties of Co3O4 with different morphologies were tested. The results showed that the 3D hierarchical flower-like Co3O4 assembled by hexagonal nanosheets exhibited higher specific capacitance (327.3 F g−1 at 0.5 A g−1) with excellent retention (96.07% at 5 A g−1) after 10 000 cycles. It is believed that this anion-assisted synthetic approach can be extended to the preparation of other transition metal oxides.
研究领域:
材料科学
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能源科学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Science
·
2018
·Vol. 5
·期 9
·1800514
·
IF 12.441
Jie Yu,Yijun Zhong,Xinhao Wu,Jaka Sunarso,Meng Ni,Wei Zhou,Zongping Shao
Hydrogen production from renewable electricity relies upon the development of an efficient alkaline water electrolysis device and, ultimately, upon the availability of low cost and stable electrocatalysts that can promote oxygen evolution reaction (OER) and hydrogen evolution reaction (HER). Normally, different electrocatalysts are applied for HER and OER because of their different reaction intermediates and mechanisms. Here, the synthesis of a heterostructured CoP@a-CoOx plate, which constitutes the embedded crystalline cobalt phosphide (CoP) nanoclusters and amorphous cobalt oxides (CoOx) nanoplates matrix, via a combined solvothermal and low temperature phosphidation route is reported. Due to the presence of synergistic effect between CoP nanoclusters and amorphous CoOx nanoplates in the catalyst, created from the strong nanointerfaces electronic interactions between CoP and CoOx phases in its heterostructure, this composite displays very high OER activity in addition to favorable HER activity that is comparable to the performance of the IrO 2 OER benchmark and approached that of the Pt/C HER benchmark. More importantly, an efficient and stable alkaline water electrolysis operation is achieved using CoP@a-CoOx plate as both cathode and anode as evidenced by the obtainment of a relatively low potential of 1.660 V at a 10 mA cm −2 current density and its marginal increase above 1.660 V over 30 h continuous operation.
研究领域:
材料科学
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电化学
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能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SYNTHETIC METALS
·
2017
·
IF 2.435
Binghu Wang,Wensheng Tan,Renjun Fu,Huihui Mao,Yong Kong,Yong Qin,Yongxin Tao
Hierarchical mesoporous Co 3 O 4 /C@MoS 2 core-shell structured materials are synthesized via a two-step calcination and a solvothermal method using cobalt metal-organic frameworks (cobalt-MOFs, ZIF-67) and (NH 4 ) 2 MoS 4 as the precursors of Co 3 O 4 /C and MoS 2 , respectively, which is a new class of core-shell materials as supercapacitor electrode materials. The obtained Co 3 O 4 /C@MoS 2 exhibits high specific capacitance (1076 F g −1 at 1 A g −1 ), rate capability (76.9% capacitance retention at 10 A g −1 ) and cyclic stability (64.5% capacitance retention after 5000 cycles at 10 A g −1 ). Moreover, the content of MoS 2 greatly influences the electrochemical performances of the obtained core-shell materials. The results demonstrate that the as-synthesized ZIF-67 can be used as a promising candidate for designing Co 3 O 4 based core-shell materials used in supercapacitors.
研究领域:
材料科学
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Yanling Li,Shengchang Wang,Junke Wu,Jinfu Ma,Lihua Cui,Hui Lu,Zhilin Sheng
We successfully synthesized a novel core-shell hybrid metal oxide via a simple one-step hydrothermal method without annealing. This composite of Co 3 O 4 particles covered with SnO 2 –SnO (Co 3 O 4 @SnO 2 –SnO) predicted better performance compared to pure Co 3 O 4 , which strongly depends on the synthetic temperature. The Co 3 O 4 @SnO 2 –SnO prepared at a temperature of 250 °C (labeled Co 3 O 4 @SnO 2 –SnO-250) exhibited an outstanding specific capacitance of 325 F g −1 under the current density of 1 A g −1 , which was much higher than those of Co 3 O 4 (12.6 F g −1 ) and other composites. Additionally, the sample also exhibited good cycle stability performance with a retention rate of 100% after 5000 cycles at a current density of 5 A g −1 . Through X-ray photoelectron spectroscopy analysis, the presumed mechanism was that Sn-O x decreases the surface electron densities of Co 3 O 4 , which is beneficial to OH − adsorption and specific capacitance improvement, and the synthetic temperature had a strong impact on the microstructure and thus on the surface electron densities. The most. obvious finding to emerge from this study is that the specific capacitance can be improved through adjusting the surface electron densities of transition metal oxides .
研究领域:
材料科学
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
Scientific Reports
·
2025
·Vol. 15
·期 1
·1-18
·
IF 3.9
Cui Haotian,Yang Rongqian,Cui Gongjun,Li Xun,Li Junxia,Kou Ziming
This research aims to design a high-temperature wear resistance cobalt-based coating of hot-end parts as protective coating. The cobalt-based matrix coatings were reinforced by NiCrAlY and different contents of TiC (6.0, 8.0 and 10.0 wt%) using laser cladding technology. Some efforts were made to explore the influence of TiC on the microstructure, hardness and wear behavior of prepared coatings. The wear behavior of coatings was done via a ball-on-disk wear machine under room temperature -800 °C. The results showed that NiCrAlY decomposed and formed γ-Co(fcc) and β-NiAl phases. The hardness of coatings with TiC was reinforced due to the fine-grain strengthening and dispersion strengthening. The friction coefficients of reinforced coatings were destroyed due to the TiC particle and in-situ synthetized ceramic particles, whereas the wear resistance of coatings with TiC was enhanced. There existed an optimal content of TiC for the wear resistance of Co-NiCrAlY-TiC coatings. The coating with 8.0 wt% TiC had a satisfactory tribologcial performance at test temperatures. It was ascribed to the moderate hardness and in-situ synthetized solid lubricants, as well as the tribo-layer.
研究领域:
材料科学
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表面工程
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机械工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF POWER SOURCES
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2016
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IF 6.333
Ruchun Li,Dan Zhou,Jiaxian Luo,Weiming Xu,Jingwei Li,Shuoshuo Li,Pengpeng Cheng,Dingsheng Yuan
Electrochemical water splitting has attracted great interest because of the growing demand for sustainable energy and increasing concerns for the environment. We present a facile strategy to design the three-dimensional (3D) urchin-like sphere arrays Co 3 O 4 as an effective bifunctional catalyst for electrochemical water splitting. The 3D urchin-like Co 3 O 4 was directly grown on Ni foam by a hydrothermal reaction and annealing treatment at a low temperature. This process offers several advantages including facile synthesis, binder-free, and low cost. The 3D urchin-like Co 3 O 4 as a catalyst for hydrogen evolution reaction exhibits a low onset potential (−130 mV vs. RHE) and good cycling stability in an alkaline electrolyte . When urchin-like Co 3 O 4 is used as a catalyst for oxygen evolution reaction , the onset potential is at 1.46 V (vs. RHE) with a low overpotential of only 230 mV. The good catalytic activity can be attributed to the unique urchin-like nanostructure , abundant mesopores, and low charge-transfer resistance (compared with Co 3 O 4 NPs). In addition, H 2 and O 2 generation was performed using Co 3 O 4 as both cathode and anode catalysts with a potential of 1.64 V to reach a current density of 10 mA cm −2 .
研究领域:
材料科学
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电化学
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能源科学
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
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2014
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IF 5.211
Xuefei Gong,J.P. Cheng,Fu Liu,Li Zhang,Xiaobin Zhang
Nickel–Cobalt hydroxide microspheres are electrodepositioned on the films of NiCo 2 O 4 nanowires grown on the current collector through a facile approach and the hierarchical structures are then investigated as an electrode material for high-performance supercapacitors . Owing to the superior electrical conductivity of NiCo 2 O 4 nanowires, the porous structure of the (Ni–Co)(OH) 2 microspheres and the synergic effect of the multi-components, the electrode can deliver a high areal capacitance of 6 F cm −2 and a corresponding specific capacitance of 1132 F g −1 at a current density of 2 mA cm −2 , as well as a good rate capability (61.8% capacitance retention from 2 mA cm −2 to 50 mA cm −2 ), and excellent cycling stability (90% capacitance retention after 2000 cycles). The results suggest that our research opens up the possibility for the fabrication of high-performance energy-storage devices of binder-free electrodes.
研究领域:
材料科学
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能源存储
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电化学
✓ 已验证
DOI
高影响因子
FERROELECTRICS
·
2024
·
IF 0.6
Muhammad Rafiq,Raza Ullah,Adeel Ahmed,Muhammad Usman,Bing Yu,You-Qing Shen,Hai-Lin Cong
Since traditional wastewater treatment techniques only partially remove antibiotics like metronidazole (MTZ), the rising use of these drugs causes their entry into wastewater and receiving surface waterways. A flexible method that may effectively degrade such organic pollutants is adsorption assisted photocatalytic degradation. Herein, an easy mixing-and-heating procedure was used to synthesize visible light-induced g-C3N4/Co3O4 heterojunction photocatalysts. The structural properties and morphology of as-prepared materials were measured using characterization techniques such as FTIR, FSEM, and XRD analysis. The as-prepared catalyst has demonstrated a remarkable adoption and photocatalytic performance in degrading MTZ. It was found that 0.2 weight percent of Co3O4 was the optimum amount for achieving the best photocatalytic efficiency. A key factor in boosting photo-generated carrier separation is the synergistic interaction between g-C3N4 and Co3O4. The kinetics study of MTZ adsorption and degradation as well as factors effecting such as pH (2-10) and catalyst dosage process were investigated. The functional treatment method attained 78% degradation of MTZ under the following general conditions: pH = 6, g-C3N4/Co3O4 = 0.04 g/L, and reaction time = 200 min and MTZ concentration = 20 mg/L. A possible mechanism for the photocatalytic degradation was introduced, wherein O2•− was found to be the leading radical, whereas h+ and HO• radicals contribute moderately to the degradation process. The research presents an appealing and environmentally friendly technique for the practical remediation of waste water carrying antibiotics.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOM
·
2020
·Vol. 72
·期 9
·3296-3302
·
IF 2.054
Liu Jiaming,Lu Yanhua,Wang Ruixiang,Xu Zhifeng,Li Xue
The development of low-cost, simple, and efficient methods to prepare high-performance anode materials is a huge challenge. In this work, Co 3 O 4 with high crystallinity was prepared by a solution combustion method. When used as an anode electrode, it displayed excellent electrochemical performance. The reversible capacity remained at 1115.7 mAh g −1 after 100 cycles at 200 mA g −1 . Moreover, the capacity retention rate reached 96.3% after 300 cycles at 1000 mA g −1 . This excellent electrochemical performance can be attributed to the special macroporous structure of Co 3 O 4 , which can increase the contact area between the electrolyte and active material, improve the transport capacity of lithium ions, and effectively alleviate the volume change stress caused by charging and discharging. These results show that the solution combustion synthesis is simple and efficient, providing a low-cost production method for production of high-performance energy storage materials.
研究领域:
材料科学
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能源存储
·
电化学
✓ 已验证
DOI
高影响因子
NANOTECHNOLOGY
·
2020
·Vol. 32
·期 2
·024001
·
IF 3.551
Yuantao Pei,Haijun Zhang,Lei Han,Liang Huang,Longhao Dong,Quanli Jia,Shaowei Zhang
Development an alternative approach to efficiently and economically produce hydrogen from water to replace non-renewable fossil fuels is one of the great challenges in the energy field. In this paper, a Co foam (CF) with 90% porosity and pore size of a few tens of micrometers was prepared, on which FeCoP nanoflowers were in-situ formed. Such a combination was used as a new electrocatalyst/self-supporting electrode for high efficiency hydrogen evolution reaction. Thanks to the larger surface area (and thus many more active sites), and quicker mass transfer through the porous structure, the CF supported FeCoP electrode exhibited much better hydrogen evolution reaction (HER) performance than the commercial Ni foam supported counterpart prepared under identical conditions. In the case of the former, only −44 mV overpotential was required to achieve a geometric current density of −10 mA cm−2, and the electrode showed a high stability at a current density < −500 mA cm−2. The electrode developed in this work could be potentially used as a novel electrode for future large-scale production of hydrogen. In addition, the novel strategy reported here could be similarly used to develop many other types of self-supporting electrodes with further improved HER performance.
研究领域:
能源材料
·
电化学
✓ 已验证
DOI
高影响因子
ACS Nano
·
2025
·
IF 16
Fengting Xie,Xuxin Kang,Ziyang Wu,Honglin Zhu,Lin Gu,Xiangmei Duan,Jianping Yang
Nitrate pollution in water bodies urgently necessitates sustainable electrocatalytic nitrate reduction (NO3RR) technologies, yet achieving high–efficiency catalysis for NO3RR with optimized interfacial charge distribution on electrocatalyst remains challenging. Herein, we report a built–in electric field (BIEF) construction strategy using mesoporous carbon–supported Co/Co3O4 heterojunction catalyst (Co/Co3O4–meso–C), which delivered exceptional NO3RR performance with 90.77% nitrate removal, 99% N2 selectivity (−1.4 V vs SCE), and robust stability (80% activity retention after 30 cycles). Density functional theory (DFT) calculations confirmed that the Co/Co3O4 heterostructure exhibited excellent NO3RR catalytic performance, which was attributed to the charge redistribution induced by the BIEF at the Co/Co3O4 interface (electron–rich Co and electron–deficient Co3O4), creating thermodynamic driving forces for optimized tandem catalysis. Mechanistic studies and theory simulations reveal that the synergy between Co3O4–mediated nitrate capture and Co–driven hydrogenation, enhanced by the mesoporous carbon architecture, underpins the catalytic activity. In a customized cross–flow electrofiltration system, the engineered membrane electrode achieves 80.57% nitrate removal within 6 h (3.0–fold faster than conventional single–cell configurations) and 99% N2 selectivity, enabled by hierarchical pore–enhanced nitrate flux and maximized active site accessibility. This work elucidates BIEF–driven interfacial charge modulation and offers a scalable membrane–electrode design for industrial NO3RR in low–concentration wastewater.
研究领域:
环境科学
·
电化学
·
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）