Nature Communications
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2025
·Vol. 16
·期 1
·1-14
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IF 15.7
Wei Zhuoming,Ding Yunxuan,Shi Weili,Zhang Feiyang,Song Yuxiang,Cui Xin,Guo Yu,Sun Licheng,Jiang Qike,Zhang Biaobiao
The use of single-atom catalysts is an effective way to reduce the amount of iridium in proton exchange membrane water electrolysis (PEM-WE). However, conventional methods can only obtain surface-loaded single atoms or clusters which cannot meet the needs of high current density and stability. In this study, assisted by lanthanum-doping-induced ion exchange, we realize atomically anchoring iridium within the Co 3 O 4 lattice. The lattice anchored iridium in lanthanum-doped Co 3 O 4 exhibits higher atomic dispersion, a larger average coordination number, and an elevated oxidation state. This improvement stimulates the oxide path mechanism (OPM), resulting in enhanced activity (236 mV at 10 mA cm −2 ) and stability (1000 h at 10 mA cm −2 ). Impressively, our catalyst demonstrates notable performance in a PEM electrolyzer with an iridium mass loading of just 0.2 mg Ir cm −2 , achieving a low cell voltage of 1.61 V at 1.0 A cm −2 and maintaining stable operation for over 1000 h. This work presents an effective strategy for fabricating low-noble-metal-loading catalysts with enhanced efficiency for PEM-WE.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2025
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IF 6.3
Huangtong Chen,Yifei Yang,Xiaofei Li,Huimei Duan
Defect engineering in oxide supports has emerged as a promising approach to enhance the surface chemical properties of active metals for methane catalytic oxidation. Herein, the N-doped Pd/Co 3 O 4 (Pd/N-Co 3 O 4 ) catalysts were successfully synthesized using ZIF-67 as a self-sacrificial template via an H 2 O-soaking treatment. Compared to conventional Pd/Co 3 O 4 catalysts (T 50 : 294 °C), the Pd/N-Co 3 O 4 catalysts exhibited superior catalytic activity (T 50 : 278 °C) and exceptional water resistance, with only a 6% activity loss at 350 °C in the presence of 5 vol% H 2 O, as opposed to a 56% loss for Pd/Co 3 O 4 catalysts. Detailed experimental characterizations revealed that N-doping significantly increased oxygen vacancy concentrations and surface lattice oxygen mobility while stabilizing Pd/PdO x active sites through the electronic metal-support interaction (EMSI) between Pd and N-Co 3 O 4 . In the Pd/N-Co 3 O 4 catalysts, the enhanced oxygen vacancies rendered the N-Co 3 O 4 support electron-rich, which in turn diminishes the electron transfer from Pd to N-Co 3 O 4 supports. This modulation effectively inhibited the excessive oxidation of Pd/PdO x active species into bulk PdO, thereby enhancing catalytic performance and water tolerance in methane oxidation. These findings provide valuable insights into the role of N-doped defect engineering in facilitating efficient methane catalytic combustion, highlighting the significance of EMSI and oxygen vacancies in optimizing catalyst performance.
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CHINESE JOURNAL OF CHEMISTRY
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2025
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IF 5.5
Xiao Liu,Xiang Yuan,Zhike Si,Haixia Liao,Lihong Wu,Yongzhu Yan,Yongxin Qian,Gengping Wan,Guizhen Wang
Comprehensive Summary Combining magnetic materials with high dielectric MXene has been proven to be an effective method to construct superb electromagnetic protective materials as they can introduce interface polarization and collaborate dielectric-magnetic loss mechanism. However, the application of such hybrid structure is constrained by the obvious instability of MXene at acidic, basic, and high-temperature environments. Herein, inspired by the great advantage of unique “hard shell and soft core” protective structure of natural coconuts, polydopamine (PDA)@Co 3 O 4 /Ti 3 C 2 T x (M)/polytetrafluoroethylene (PTFE) composite was fabricated for durable electromagnetic protective application. In this structure, the antioxidant PDA and chemically inert PTFE serve as a robust protective layer analogous to a “coconut shell”, effectively encapsulating the Co 3 O 4 /Ti 3 C 2 T x core, which functions as the primary additive for electromagnetic wave attenuation. The PDA@Co 3 O 4 /M/PTFE composite demonstrates a reflection loss (RL) value of −59.12 dB and an effective absorption bandwidth (EAB) of 6.72 GHz. It also exhibits electromagnetic shielding effectiveness of up to 27.67 dB and an absorption efficiency of 94.12%. Furthermore, the composite shows excellent environmental stability under acidic, basic, and sunlight exposure conditions, along with outstanding hydrophobic and flame-retardant properties. In conclusion, the PDA@Co 3 O 4 /M/PTFE has significant potential to satisfy electromagnetic protective need of electronic systems, aerospace, and defense industries under harsh conditions.
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Journal of Environmental Chemical Engineering
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2025
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IF 7.2
Shihua Zhang,Shuang Dai,Qiao Huang,Jincan Huang,Shengqiang Hei,Peng Wang,Biming Liu
The confinement effect triggered by nano-confinement systems in the advanced oxidation processes has received extensive attention. In this study, the strategy of constructing stable confined Co 3 O 4 @SiO 2 materials and activating peroxymonosulfate (PMS) was adopted to successfully achieve the efficient removal of enrofloxacin (EON). The removal efficiency of EON by Co 3 O 4 @SiO 2 (0.08 g/L) could reach 99 % at pH 0 of 7 and PMS of 0.2 g/L, and the optimal degradation rate could reach 0.147 min −1 , which was 9.6 times higher than that of the unconfined system. The reaction process was mainly driven by the synergistic interaction between the non-radical 1 O 2 and the interfacial electron transfer network, and the formation of oxygen vacancies within the reaction system accelerated the degradation process. Density functional theory calculations further showed that the confinement effect of SiO 2 aerogel stabilized the Co 3 O 4 nanoparticles, the charge transfer efficiency between Co 3 O 4 @SiO 2 and PMS was optimized, and at the same time, Co 3 O 4 was the key active site for EON degradation. This research can provide an effective strategy for the activation of PMS by SiO 2 aerogel confined structure to remove antibiotic pollutants.
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RSC Advances
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2025
·Vol. 15
·期 37
·30817-30828
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IF 4.6
Hui Fui,Xinran Ma,Yiping Huang,Shiyao Xi,Zhandong Ren,Yuchan Zhu
AS a low-cost and high-performance catalyst, spinel cobalt oxide (Co3O4) has two different catalytic active sites (tetrahedral Co2+ and octahedral Co3+) to drive the activation of peroxymonosulfate (PMS) through Co2+/Co3+ redox cycle. Tuning Co2+/Co3+ atomic ratio on the surface of Co3O4 for the construction of a synergy in the Co2+/Co3+ redox cycle might be an effective way to further boost PMS activation performance of Co3O4 catalyst. Herein, we suggested a metal-doping strategy to regulate Co2+/Co3+ atomic ratio of Co3O4 by partially substituting Co2+ with inert Mg2+ and formed a series of Mg doped Co3O4 (MCO) catalysts. Structural characterizations and experimental investigations demonstrated that Mg doping did not change Co3O4 host lattice and particle morphology, but could manipulate surface Co2+/Co3+ atomic ratio of Co3O4 for an improved PMS activation. The optimal MCO catalysts (MCO-0.2) with the suitable Co2+/Co3+ atomic ratios (1.13) exhibited the excellent thiacloprid (THIA) degradation performance through PMS activation, and the apparent degradation rate constant (0.2835 min−1) was highly outperformed that of pure Co3O4 (0.09555 min−1) and other similar cobalt-based catalysts. The optimal THIA degradation conditions might be: catalyst dose 100 mg L−1, PMS concentration 0.8 mM, pH 7 and THIA concentration 20 mg L−1. Quenching experiments and electron paramagnetic resonance (EPR) characterizations suggested SO4˙−, HO˙ and 1O2 were all involved in THIA degradation during the MCO-0.2/PMS process. Furthermore, the steady-state concentrations of these reactive species and their relative contributions to THIA degradation were also calculated by combining a kinetic model and a series of probe compound-based experiments. The results indicated that SO4˙− and HO˙ were generated at lower steady-state concentrations than that of 1O2, but they dominated THIA abatement during the MCO-0.2/PMS process. This study presented new insights into the construction of efficient PMS activator and a mechanistic understanding for PMS-mediated reaction.
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LANGMUIR
·
2025
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IF 3.9
Jiao Wang,Yang Yu,Anqi Wang,Chunxu Chen,Shaojun Li,Lei Bai
The efficient activation of the O–O band in persulfate (PDS) with high energy was important and could be achieved by the interface engineering of catalysts. It was discovered that the robust bisphenol A (BPA) degradation could be achieved in the presence of PDS via different mechanisms with steel-wool-shaped Cu–Co3O4 composites obtained via in-situ hydrolysis of cobalt and copper nitrate with zeolitic imidazolate framework-67 after calcination. The calcination temperature at 483 K resulted in abundant oxygen vacancies in Cu–Co3O4 with the amorphous structure, which displayed about a 25-fold higher degradation rate constant (k = 0.385 min–1) than that (0.015 min–1) of Co3O4 for BPA disposal with PDS, possibly via forming the surface-activated complex process. The higher temperature (583 K) treated Cu–Co3O4 could also lead to the fast BPA degradation with the k of 0.670 min–1, which was more than 160-fold higher than the referenced Co3O4 and experienced the radical and nonradical processes, including the HO•, SO4•–, O2•–, and 1O2 as reactive oxygen species. The above difference was possibly due to the amount of oxygen vacancy, the ratio of metal ions with different oxidation states, and the interaction of Cu–O–Co in the composite.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
·
IF 9.4
Shuangshuang Li,Jie Liu,Yunmei Du,Mengmeng Wang,Yuanxiang Gu,Dehong Chen,Ruiyong Zhang,Lei Wang
The difficulty of nitride modification is to develop simple and efficient strategies to induce defects and efficiently capture Ru atoms. With these in mind, this work innovatively constructed a Ru-Co 3 O 4 /CoN-L catalyst with abundant anion defects (oxygen vacancies (V O ) and nitrogen vacancies (V N )) using the nitridation-quenching-Ru doping strategy. Surprisingly, the porous structure provided more active sites, and the V N and V O were conducive to promoting the anchoring of Ru atoms. These significantly improved the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) performances of the Ru-Co 3 O 4 /CoN/NF-L catalyst. The density functional theory results showed that the anion defects optimized the hydrogen adsorption capacity of the Ru active sites for the HER. Furthermore, Ru dopants and anion defects reduced the OER energy barrier of the Co-active sites, accelerating the HER and OER kinetics. This study proposes a new concept for defect construction and nitride-structure optimization.
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COLLOIDS AND SURFACES B-BIOINTERFACES
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2017
·
IF 3.887
Wei Zhang,Jinlai Dong,Yang Wu,Peng Cao,Lina Song,Ming Ma,Ning Gu,Yu Zhang
In this study, Co 3 O 4 nanopolyhedrons, nanocubes, nanoplates and nanorods were synthesized and characterized. Furthermore, the peroxidase- and catalase-like activities of these Co 3 O 4 nanoparticles (NPs) were studied and influence of the exposed crystal planes was explored. According to their morphology and peroxidase-like activity, dimercaptosuccinic acid (DMSA) modified Co 3 O 4 nanopolyhedrons synthesized via coprecipitation method (Co 3 O 4 NHs) were selected as a proper candidate for the immunohistochemical (IHC) detection of epidermal growth factor receptor (EGFR) expression in non-small cell lung cancer (NSCLC) tissues. Bivalent cobalt ions were coupled to the carboxyls on the surface of the obtained Co 3 O 4 NHs so as to chelate the hexahistidine residues (His-Tags) at the C-terminal of EGFR single-domain antibodies (EGFR sdAbs). Finally, the as-obtained EGFR sdAbs-binding Co 3 O 4 NHs (Co 3 O 4 nanoprobes) were successfully applied to the detection of EGFR expression in NSCLC tissues.
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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 .
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SENSORS AND ACTUATORS B-CHEMICAL
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2022
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IF 9.221
Rongrong Jin,Yueru Jiang,Liupeng Zhao,Tianshuang Wang,Xiaomin Liu,Fangmeng Liu,Xu Yan,Peng Sun,Geyu Lu
In this paper, we successfully prepared Ru-doped Co 3 O 4 flower-like hollow microspheres by a simple hydrothermal method . The microstructure characterization results indicated the formation of well-organized microflowers with a size of 0.5–1 µm, which were composed of nanosheets . The gas sensing performances of sensors by using the synthesized Ru-doped Co 3 O 4 hollow microflowers as sensing material were investigated. The 1 at% Ru-doped Co 3 O 4 sensor showed the best acetone sensing performance and had a response 18.8–10 ppm acetone, which was almost 5.4 times that of pure Co 3 O 4 . Significantly, the sensor had an ultra-low detection limit, with a response value of 1.5–50 ppb acetone at 137.5 °C (30%RH). We propose a plausible mechanism for sensing performance improvement. Namely, the substitution of Ru 4+ regulated the carrier concentration and induced the change of Co 3 O 4 defect oxygen and chemisorbed oxygen.
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CERAMICS INTERNATIONAL
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2020
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IF 3.83
Bo Yu,Fanming Meng,Muhammad Wasim Khan,Rui Qin,Xingbin Liu
Traditional bulk photocatalysts often experience serious charge recombination and poor visible-light capturing, resulting in inefficient photocatalytic activity. However, proper nanostructure design usually helps to increase the activity of composite photocatalysts. Here, hollow TiO 2 @g-C 3 N 4 /Co 3 O 4 core-shell microspheres are first reported. The hollow structure of the heterostructured will directionally separate the photogenerated carriers, and the photogenerated holes transferred to the surface will be further captured by Co 3 O 4 to achieve an exposed oxidized surface. The novel multi-stage hollow microspheres can simultaneously achieve effective transfer of photogenerated carriers and extended light absorption. Benefiting from these structural and compositional characteristics, the optimized TiO 2 @g-C 3 N 4 /Co 3 O 4 nanospheres have excellent photodegradation activity for tetracycline and MO. Under simulated sunlight, the degradation rates of TC (10 mg/L) and MO (25 mg/L) at 60 min are 91.6% and 97.8%, respectively. At the same time, high activity is maintained after multiple cycles of testing. Possible transfer paths for photogenerated carriers have also been proposed. This work will provide more inspiration for the design of multi-stage hollow photocatalytic systems.
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FUEL
·
2022
·
IF 8.035
Yihua Yue,Zhongliang Huang,Dongren Cai,Shafqat Ullah,Abdul-Rauf Ibrahim,Xin Yang,Jiale Huang,Guowu Zhan
Controlled fabrication of spatial positions of different active sites on catalyst structures is critical to exploring the reaction mechanisms for CO 2 hydrogenation. Herein, two isomorphous zeolitic imidazolate frameworks (ZIF-67 and ZIF-8) were used as sacrificial templates to synthesize multi-layered Co 3 O 4 /ZnO catalysts with tunable core-shell structures and well-controlled spatial positions. The multi-layered catalysts were then evaluated for the catalytic performance for CO 2 hydrogenation. A series of characterization techniques were applied to investigate the morphology and structure of the Co 3 O 4 /ZnO composites with different spatial locations. Due to the unique multi-layered structure, the distinct interfacial structures, and the synergistic effects, the resultant core-shell structured Co 3 O 4 /ZnO nanocatalysts exhibited significantly enhanced activity as compared to their monometallic counterparts (pure Co 3 O 4 and ZnO). In addition, the ZnO@Co 3 O 4 with Co 3 O 4 as shell showed significantly higher CO 2 conversion (25%) than that of Co 3 O 4 @ZnO with ZnO as shell (0.82%). Furthermore, in-situ Diffuse Reflection Fourier Transform Infrared Spectroscopy (DRIFTS) analysis suggested that formate (HCOO*) and methoxy (CH 3 O*) species were the crucial intermediates in the CO 2 hydrogenation over the Co 3 O 4 /ZnO composite nanocatalysts. However, pure ZnO could not activate the CO 2 ; consequently, the use of the Co 3 O 4 /ZnO nanocatalysts derived from multiple-layered ZIFs structures provides new insights into improving the catalytic efficiency of CO 2 hydrogenation.
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