JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2025
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IF 9.7
Kaiyue Zhang,Bin Feng,Hong Wang,Lijie Liu,Liang Hu,Hui Zhao,Zeyu Xu,Xihao Zhang,Jianguo Liu
Vanadium flow batteries (VFBs) face critical challenges in power density due to sluggish redox kinetics and inefficient mass transport. Herein, we propose a dual-functional strategy that synergistically addresses both limitations through precursor morphology engineering. By precisely regulating hydrothermal crystallization kinetics, cobalt carbonate hydroxide (CCH) precursors evolve from 1D nanorods to 2D nanosheets, which transform into Co 3 O 4 nanoarrays after annealing while retaining structural features. The resulting 1D rod-like architectures create open mesoporous channels for rapid ion diffusion, while defective Co 3 O 4 surfaces enriched with oxygen vacancies enhance redox kinetics. DFT calculations reveal that oxygen vacancies upshift the Co d-band center in Co 3 O 4 , strengthening vanadium ion adsorption and accelerating redox reactions. Finite element analysis demonstrates that the rod-like microstructure enhances mass transport and reduces concentration polarization, while its uniform potential distribution suppresses parasitic side reactions. As a result, the VFB with Co 3 O 4 @CF-90 achieves a high energy efficiency of 74.4 % at 300 mA cm −2 , outperforming conventional carbon felt by 9.7 %, and maintains 80.2 % efficiency at 200 mA cm −2 over 400 cycles. This work establishes a scalable morphology-induced vacancy engineering paradigm for high-performance flow battery electrodes, decoupling catalytic and transport optimization through precursor design.
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APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Kun Li,Xiao Chang,Xurong Qiao,Shifan Yu,Xiaofang Li,Fujun Xia,Qingzhong Xue
Metal-organic frameworks (MOFs) derived metal oxides, as a promising gas-sensing material, have received extensive attention because of its unique advantages of abundant pore structures, high surface areas and diverse compositions. In this work, hierarchical flower-like Zn-doped Co 3 O 4 derived from Zn/Co-MOF is prepared through a process of solvothermal synthesis and annealing. 3 mol% Zn-doped Co 3 O 4 exhibits the highest response of 52.3 toward 100 ppm acetone at 200 °C, which is nearly 20 times higher than that of pure Co 3 O 4 . Additionally, 3 mol% Zn-doped Co 3 O 4 based sensor displays a ppb-level detection limit for acetone, outstanding selectivity, excellent long-term stability and good independence to humidity. The probable reasons for the improved sensing properties are attributed to the changes of carrier concentration, specific surface area and chemisorbed oxygen amount due to Zn doping.
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MATERIALS TECHNOLOGY
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2021
·
IF 3.846
Juanjuan Yin,Yuanyuan Guo,Zhiwei Liu,Qingrui Zhang,Tifeng Jiao
The energy problem is closely related to the survival and development of human beings. Nowadays, the research of fuel cells is making rapid progress, but the bottleneck of the development of fuel cells is slow oxygen reduction reaction (ORR) of cathode. At present, it is difficult to develop a kind of oxygen reduction catalyst with high performance, low energy consumption and low pollution. Here, we synthesised Co3O4 nanocrystals loaded on a single graphene oxide layer via a convenient one-step hydrothermal method. According to the transmission electron microscopy characterisation tests, the average size of Co3O4 nanocrystals is 5 nm. Compared with the commercially available Pt/C catalyst, the obtained Co3O4/rGO catalyst demonstrates the same four-electron (4e−) oxygen reduction reaction, and the catalytic activity of ORR is significantly higher. This is due to the large surface area provided by the middle part of the composite catalyst Co3O4/rGO, which provides an effective mass transfer and electron transfer path for the catalyst.
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ChemElectroChem
·
2017
·Vol. 4
·期 6
·1279-1286
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IF 4.136
Jinling Zhou,Tongguang Ge,Xiangzhi Cui,Jian Lv,Hangle Guo,Zile Hua,Jianlin Shi
Graphical Upping the pace : A novel precious-metal-free cathode catalyst, Co 3 O 4 nanoparticle-incorporated m -Beta zeolite, is synthesized and used to speed up the sluggish oxygen reduction reaction through a synergistic catalytic effect. Cost-efficient and high-performance oxygen reduction electrocatalysts are widely pursued to boost the sluggish oxygen reduction reaction (ORR) for renewable-energy technology applications. Here, a novel precious-metal-free cathode catalyst, Co 3 O 4 nanoparticle-incorporated mesoporous Beta zeolite, was first synthesized by using a facile steam-assisted crystallization (SAC) and hydrothermal approach. Owning to the synergetic catalytic effects between the Co 3 O 4 nanoparticles and the mesoporous Beta matrix, the resulting Co 3 O 4 / m -Beta nanocomposites catalyst showed comparable ORR electrochemical catalytic activity to the benchmark 20 wt% Pt/C catalyst with a high onset potential of 0.88 V, and much higher methanol tolerance with a negligible negative shift of the peak potential and excellent electrochemical stability in alkaline media. The relatively higher surface Co 2+ concentration and the abundant Brønsted acid sites facilitate the ORR process, mainly through a 4e − pathway, which makes the Co 3 O 4 / m -Beta nanocomposite a favorable candidate for improving energy storage and conversion efficiencies in fuel cells.
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SENSORS AND ACTUATORS B-CHEMICAL
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2021
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IF 7.46
Xiao Wang,Wenjing Liu,Tongkai Wang,Yuli Zhao,Gang Zhao,Shouwei Zhang,Jinzhao Huang,Xijin Xu
Amorphous/crystalline heterophase composites possess expansive reaction interfaces and abundant oxygen vacancy defects, providing novel electron-hole transmittal mode and significantly facilitating the surface adsorptions and redox reactions . Herein, galvanic replacement reaction (GRR) was used to construct amorphous SnO x / crystalline Co 3 O 4 multishell heterostructures . Characterizations indicated the continuous transition from Co 3 O 4 to amorphous SnO x on each shell, generating abundant amorphous/crystalline interfaces. Moreover, the oxygen vacancy defects concentration also increased with the GRR proceeding. Benefitting from theses, the surface oxygen adsorption was facilitated due to more surface active sites and enhanced carrier densities. However, with further increasing the reaction time, decreased adsorbed oxygen concentrations were detected, owning to the unexpected high potential barriers induced by excessive heterojunctions . Gas sensing results showed that the sensors with 1 h GRR exhibited the best sensing performance with an exceptional response (1268) to 100 ppm formaldehyde gas and low detection limit (21 ppb) at low working temperatures (100 °C). The synergistic effects between oxygen vacancy defects and amorphous/crystalline heterophase interfaces on the superior gas sensing behaviors were also investigated. Most importantly, results presented will shed lights on the rational design of highly sensitive gas sensors through amorphous/crystalline interfaces constructions.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2021
·
IF 5.816
Ahmed Zaki Alhakemy,Nangan Senthilkumar,Yichun Ding,Junwei Li,Zhenhai Wen
Exploring low-cost, highly efficient, and sustainable non-precious electrocatalysts for electrolytic H 2 generation is driving research for the sustainable green urban development. Herein, we present a simple synthetic approach, through a two-step process, to prepare the bifunctional electrode of Co 3 O 4 –C@FeMoP hybrid micro rods/nanosheets anchored on nickel foam (NF), in which the Co 3 O 4 –C microrods grown on NF surface are decorated by FeMoP nanosheet layers, which is directly grown through a simple hydrothermal followed by post-phosphorization processes. The obtained hybrid hierarchical Co 3 O 4 –C@FeMoP/NF shows a significant enhancement in the electrocatalytic activities of oxygen/hydrogen evolution reactions (OER/HER) in comparison to the individual Co 3 O 4 –C and FeMoP nanostructures , thanks to more heterointerface active sites provided by FeMoP nanostructures with three-dimensional (3-D) layered architectures. The Co 3 O 4 –C@FeMoP/NF catalyst exhibits a relatively small overpotential of 200 mV vs. RHE for OER to achieve 20 mA/cm 2 and 123 mV vs RHE at 10 mA/cm 2 for HER along with excellent durability in alkaline electrolytes . We demonstrate the bifunctional electrocatalytic electrode as the electrolyzer for the generation of H 2 via water splitting at small applied voltage of 1.61 V to achieve 10 mA/cm 2 and good stability for 24-h continuous running.
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Nano Research
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2017
·Vol. 10
·期 10
·3457-3467
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IF 7.354
Sun Yan,Huang Fangzhi,Li Shikuo,Shen Yuhua,Xie Anjian
A Co-based metal-organic framework (Co-MOF) with a unique three-dimensional starfish-like nanostructure was successfully synthesized using a simple ultrasonic method. After subsequent carbonization and oxidation, a nanocomposite of nitrogen-doped carbon with a Co 3 O 4 coating (Co 3 O 4 @N-C) with a porous starfish-like nanostructure was obtained. The final hybrid exhibited excellent lithium storage performance when evaluated as an anode material in a lithiumion battery. A remarkable and stable discharge capacity of 795 mAh·g −1 was maintained at 0.5 A·g −1 after 300 cycles. Excellent rate capability was also obtained. In addition, a full Co 3 O 4 @N-C/LiFePO 4 battery displayed stable capacity retention of 95% after 100 cycles. This excellent lithium storage performance is attributed to the unique porous starfish-like structure, which effectively buffers the volume expansion that occurs during Li + insertion/deinsertion. Meanwhile, the nitrogendoped carbon coating enhances the electrical conductivity and provides a buffer layer to accommodate the volume change and accelerate the formation of a stable solid electrolyte interface layer.
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Journal of Physical Chemistry Letters
·
2025
·
IF 4.6
Yuhui Sun,Junnan Han,Min Wang,Zhihuan Li,Zijie Lin,Shimin Chen,Zehui Zhang,Shijie Yang,Linwei Yu,Zhongwei Yu,Guangbin Zhang,Wei Li,Songke Mao,Hucheng Song,Jun Xu,Kunji Chen
The global energy crisis and unsustainable reliance on fossil fuels make it particularly urgent to develop efficient renewable energy storage solutions. Aqueous zinc–air batteries (ZABs) have become extremely promising candidates due to their low cost, abundant surface resources, inherent safety, and high theoretical energy density. This study explores the feasibility of using seawater as an electrolyte for ZABs, with the aim to reduce costs and alleviate competition for limited freshwater resources. Research results indicate that ZABs using seawater electrolytes with varying salinities (1.4–10%) show good bifunctional catalytic performance in the oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) with defect-driven Co3O4–MoS2 bifunctional catalysts, while maintaining strong catalytic activity and stability in nonextreme salinity environments. The assembled ZABs with defect-driven Co3O4–MoS2 bifunctional catalysts display a charge–discharge voltage difference of less than 1.1 V, can stably operate for more than 360 cycles at a current density of 5 mA/cm2, and exhibit strong tolerance to halogen ions, with performance comparable to that of batteries using conventional deionized water-based electrolytes. These findings underscore the feasibility of seawater-based ZABs, breaking through the limitations of traditional deionized water-based electrolytes and expanding the application prospects of aqueous ZABs in the realm of sustainable energy storage.
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Batteries & Supercaps
·
2025
·
IF 4.7
Xu Zhang,Heng Xiang,Chuang Pang,Keyu Zhao,Zhongli Zou,Kui Cheng
The development of flexible energy-storage devices is limited by the poor conductivity, limited cycling stability, and slow electron/ion transport of metal oxides. Optimizing their structure and performance is crucial for advancing these technologies. Herein, a hollow cubic core–shell Co 3 O 4 @MnO 2 is synthesized via annealing and hydrothermal approaches. This composite enjoys advantages of the high electrical conductivity of Co 3 O 4 and the excellent pseudocapacitive properties of MnO 2 ; in addition, the hollow structure of the composite effectively mitigates the mechanical stress caused by volume changes during charge–discharge cycles. Owing to its large specific surface area and stable framework, Co 3 O 4 @MnO 2 achieves a high specific capacitance of 670.2 F g −1 and retains 83.18% of its initial capacitance after 10,000 cycles, demonstrating exceptional electrochemical stability and durability. Subsequently, an all-solid-state flexible supercapacitor was assembled using Co 3 O 4 @MnO 2 positive electrode and a negative electrode made of reduced graphene oxide hydrogel. The device achieves a high energy density of 78.2 W h kg −1 and a power density of 11,500 W kg −1 . Further, even after 10,000 charge–discharge cycles, it retained 73.1% of its initial capacitance, demonstrating potential for flexible energy-storage applications. This article highlights the advantages of Co 3 O 4 @MnO 2 in enhancing supercapacitor performance and offers insights for cost-effective cobalt-based energy-storage systems. Graphical The diagram illustrates the synthesis process of Co 3 O 4 @MnO 2 composites, in which a hollow core–shell structure is successfully constructed with Co 3 O 4 cages serving as the core and MnO 2 nanosheets as the shell.
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ACS Applied Energy Materials
·
2025
·
IF 5.5
Yu Zuo,Zhuo Cai,Zijian Li,Jiepeng Zhao,Jun Sun,Xinyu Wang,Yifei Ma,Zhaomin Tong,Mei Wang,Liantuan Xiao,Suotang Jia,Xuyuan Chen
Co3O4 obtained from zeolitic imidazolate framework-67 (ZIF-67) has great potential for supercapacitor applications owing to its exceptional electrochemical behavior and adjustable structural characteristics. However, Co3O4 in powder form and conventional slurry coating methods suffer from problems like poor electrical conductivity and ion diffusion, weak electrode integration, complex processing, and particle aggregation. Growing vertically aligned Co3O4 directly on conductive substrates to construct binder-free integrated electrodes seems to be an effective strategy to address these problems and enhance the electrochemical performance and stability. In this study, vertically aligned Co3O4 nanoarrays (Co3O4/NA) with a high mass loading were successfully synthesized on carbon fabric by combining a static growth method with heat treatment. By optimizing the growth time of ZIF-67 (4, 6, 8, and 10 h), the electrode obtained at 8 h exhibited the best performance, delivering an areal capacitance of 466.07 mF·cm–2 at 1 mA·cm–2. Furthermore, based on the optimized growth time (8 h), a subsequent annealing strategy (vacuum annealing followed by air annealing) was employed, which effectively regulated the morphology, specific surface area, pore structure, and introduced oxygen vacancies, thereby further boosting the capacitance to 952 mF·cm–2 at 1 mA·cm–2 under a high mass loading (4.7 mg·cm–2). Asymmetric supercapacitors fabricated using activated carbon and ZIF-67-derived Co3O4 nanoarrays displayed an impressive specific energy of 99 μWh·cm–2. Moreover, it retained 82% of the initial capacitance when subjected to 5000 tests at 5 mA·cm–2. Thus, the design of vertically aligned Co3O4 nanoarrays shows great potential in supercapacitor applications.
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GREEN CHEMISTRY
·
2025
·
IF 9.2
Wen-Jing Shi,Zhen-Hong He,Mei-Xia Yang,Yue Tian,Lu-Ting Pan,Xin-Yan Wei,Weitao Wang,Kuan Wang,Huan Wang,Zhao-Tie Liu
Utilizing renewable energy-derived H2 to convert CO2 into valuable chemicals represents a crucial strategy for achieving carbon emission reduction and enabling resource utilization. Conventional photocatalytic CO2 methanation, however, is hindered by low activity and inefficient energy utilization, limiting its practical application. In the present work, we developed a Cu and Nd co-doped Co3O4 catalyst that synergistically harnesses both light and thermal energy for photothermal catalytic CO2 methanation. The optimized catalyst with a molar ratio of 9/1/1 for Co/Cu/Nd (denoted as CCNO-9) achieves a remarkable CH4 formation activity of 27.3 mmol·gcat-1·h-1 at 200 °C, especially at ambient pressure. The incorporation of foreign Cu and Nd atoms in Co3O4 lattice induces the formation of abundant heterogeneous interfaces and oxygen vacancies, thereby exposing additional active sites for CO2 adsorption and activation. In-situ DRIFTS studies revealed that the Nd promotes the conversion of CO2 into *HCO3- and *COOH key intermediates. The photothermal synergy significantly enhances the reaction. Photoexcitation generates electrons and holes for CO2 reduction, while the thermal energy assists in overcoming the reaction energy barriers. DFT calculations confirmed that the CCNO-9 catalyst requires the lowest energy barrier for the rate-determining step from *COOH to *CH4. This study presents a very active and stable photothermal catalytic system for efficient CO2 conversion, advancing the development of low-carbon catalytic technologies.
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Journal of Energy Storage
·
2025
·
IF 9.8
Yong Tang,Jianwei Zhao,Yi Li,Yujing Wang,Guangqiu Zhang,Yihang Zhao,Lirong Qin
In this study, we synthesized Co 3 O 4 :Ce 3+ /Mn 2+ granular nanowires on nickel foam as an electrode for supercapacitors using a hydrothermal method. The introduction of Mn 2+ ions into the Co 3 O 4 :Ce 3+ electrode material increased the oxygen vacancy and Co 2+ /Co 3+ ratio of the material, resulting in an increase in electrical conductivity and electrochemical performance. In the three-electrode system, the Co 3 O 4 :Ce 3+ /Mn 2+ electrode achieved a specific capacitance of 2527.8 F/g at 1 A/g, which is 65 % higher than that without Mn 2+ ions. A symmetric supercapacitor (SSC) device was prepared by assembling two electrode components. At a current density of 1 A/g, the SSC device achieved a specific capacitance of 467.0 F/g, delivering a maximum energy density of 233.5 Wh/kg (1 A/g) and a maximum power density of 36,600 W/kg (20 A/g), coupled with outstanding cycling stability. These results indicate that the Co 3 O 4 :Ce 3+ /Mn 2+ nanowires coated nickel foam electrode holds considerable promise for applications in energy storage.
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