JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Zhen Peng,Xiaojie Yin,Tianli Han,Jiawei Long,Jinpei Hei,Jinyun Liu
High energy-storage Li-ion battery needs a high-capacity anode. However, current graphite-based anode doesn’t meet this requirement, thus developing high performance anode materials is highly needed and significant. Here, we provide a rational engineering of a multi-layered hollow structure combining with surface coating of polyamine (PANI) layer, forming a Co 3 O 4 /NiO@PANI hybrid using for Li-ion battery anode. PANI is able to effectively improve the conductivity of active materials; besides, PANI is flexible, which can prevent the collapse of the structure caused by volume-expansion during charge and discharge. The multi-layered morphology improves the utilization ratio of voids inside the conventional hollow structured materials, which is significant to improve capacity in practical applications. The Co 3 O 4 /NiO@PANI hybrid-based anode shows a capacity of 1049 mAh g −1 along with a Coulombic efficiency of 99.3% after 100 cycles of 0.2 A g −1 . Rate-performance of Co 3 O 4 /NiO@PANI exceeds that of the bare Co 3 O 4 /NiO. It is believed that the hierarchical structure combining multi-layered hollow morphology with surface coating of conductive polymer presented here would find broad applications for developing high-performance energy-storage hybrids.
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ACTA PHYSICO-CHIMICA SINICA
·
2017
·Vol. 33
·期 7
·1453-1461
·
IF 0.767
LIU Jing-Wei,YANG Na-Ting,ZHU Yan
We report an efficient catalyst composed of ternary components prepared by inlaying Pd/Co3O4 nanoparticles in alkaline Al2O3 nanosheets for catalytic oxidation of methane. Pd/Co3O4 inlaid in alkaline Al2O3
exhibited a higher ability to break the C-H bond of methane than Pd/Co3O4 supported on SiO2, ZrO2, CeO2, and acidic or neutral Al2O3. Our results show more oxygen vacancies and higher amounts of surface adsorbed oxygen
on the surface of Pd/Co3O4/alkaline Al2O3 than on other catalysts, which is responsible for methane activation and conversion. Further, the Pd/Co3O4/alkaline Al2O3 catalyst can almost restore to its initial
value in the absence of water when 5% (volume fraction) vapor water was cut off, although a decrease in activity occurred when water vapor was introduced to the reaction system. Even under a condition similar to the exhaust of a lean-burn natural gas engine, the catalytic performance of the
Pd/Co3O4/alkaline Al2O3 catalyst is excellent, that is, methane could be completely converted when the sample temperature in the reaction atmosphere was ramped to 400°C.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Xiao Song,Yanan Kong,Xiaoxia Sun,Shuaihu Ma,Siyu Zhu,Zhilou Liu,Hui Liu,Lei Wang,Shu Yang
Achieving efficient catalytic oxidation of VOCs by transition metal oxides at low temperatures is a major challenge. Controlling exposed crystal facets through crystal facet engineering is an efficient strategy for enhancing the catalytic activity of catalysts. Herein, we proposed an anion-inducted method for precisely modulating the exposed crystal facets on Co 3 O 4 catalysts by using different types of cobalt salts. The Co 3 O 4 -a catalyst with highly exposed (220) facets exhibits exceptional catalytic performance, achieving 90% conversion of benzene and toluene at 239 and 240 °C, respectively, which are significantly lower than the temperatures required for Co 3 O 4 -s (286 and 299 °C). The specific reaction rates of Co 3 O 4 -a for benzene and toluene catalytic oxidation were 19.7 × 10 −9 mol/m 2 /s and 15.5 × 10 −9 mol/m 2 /s, which were 3.1 times and 19.4 times than that of Co 3 O 4 -s (6.3 × 10 −9 mol/m 2 /s and 0.8 × 10 −9 mol/m 2 /s), respectively. The excellent activity of Co 3 O 4 -a catalyst was due to stronger interactions between the tetra-coordinated cobalt atoms (Co 4c ) on the (220) crystal plane with reactants by in situ DRIFTS and DFT results. The Co 4c sites act as bifunctional active centers, simultaneously inducing C C bond elongation in aromatic hydrocarbons and O O bond activation in O 2 , which the pre-activation of adsorbed molecules can lower the energy barriers for C H cleavage and ring-opening reactions, and ultimately promotes the deep oxidation of VOCs. This research deepens the understanding of surface structure-oriented catalysis in VOCs oxidation, while aiding the rational design of advanced catalysts.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Huihui Shi,Peixin Yang,Lu Huang,Yali Wu,Duohuan Yu,Hangfei Wu,Yunhuai Zhang,Peng Xiao
The design and manufacture of high activity and thermal stability catalysts with minimal precious metal loading is essential for deep degradation of volatile organic compounds (VOCs). In this paper, a novel single-atom Pt-CeO 2 /Co 3 O 4 catalyst with ultra-low Pt loading capacity (0.06 wt%, denoted as 0.06Pt-SA) was fabricated via one-step co-precipitation method. The 0.06Pt-SA exhibited excellent toluene degradation activity of T 90 = 169 °C, matched with the nanoparticle Pt-supported CeO 2 /Co 3 O 4 catalyst with more than six times higher Pt loading (0.41 wt%, denoted as 0.41Pt-NP). Moreover, the ultra-long durability (toluene conversion remains 99% after 120 h stability test) and excellent toluene degradation ability in a wide space speed range of 0.06Pt-SA were superior to that of 0.41Pt-NP catalyst. The excellent performance was derived from the strong metal-support interaction (SMSI) between the single atomic Pt and the carrier, which induced more Pt 0 and Ce 3+ for oxygen activation and more Co 3+ for toluene removal. The in situ diffuse reflectance infrared spectroscopy (DRIFTS) experiments confirmed that the conversion of intermediates was accelerated in the reaction process, thereby promoting the toluene degradation. Our results should inspire the exploitation of noble single-atomic modification strategy for developing the low cost and high performance VOCs catalyst.
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高影响因子
ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Chuanjun Yuan,Ming Li,Meng Wang,Yuanyuan Dan,Tianchun Lin,Haijun Cao,Mengjie Zhang,Peng Zhao,Hui Yang
Latent fingerprints are one of the most important trace evidences at crime scenes that can be used for individual recognition. The invisible nature of latent fingerprints gives rise to various kinds of development and imaging techniques, among which a number of electrochemical methods are receiving increasing attention. We report herein a new interfacial strategy based on spatially selective electrodeposition of Co 3 O 4 films with electrochromic properties to develop and enhance latent fingerprints on stainless steel surfaces. During the development process by potentiostatical deposition of Co 3 O 4 on the background, image contrast and development accuracy as two key factors that measure the effectiveness of fingerprint development are systemically evaluated from millimeter to microscopic scales. Three levels of morphological features in latent fingerprints can be well developed. Optical properties of deposited Co 3 O 4 films can be reversibly adjusted by changing applied potential. This phenomenon is analyzed qualitatively through visual appraisal and determined quantitatively by using color channels. The results indicate that image enhancement of developed fingerprints can be easily accomplished by extracting the blue channel of captured images. Forensic DNA typing is also performed to reveal the impact of this method on DNA evidence in fingerprint residues. The ratio of detected loci reaches 80.9% after electrochemical process. This novel method has advantages including high development accuracy, adjustable image contrast, and relatively non-destructive to DNA analysis.
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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.
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高影响因子
Biosensors-Basel
·
2025
·Vol. 15
·期 1
·63
·
IF 5.6
Changfeng Zhu,Yujiao Zhao,Jiyang Liu
The sensitive detection of inflammatory biomarkers in gingival crevicular fluid (GCF) is highly desirable for the evaluation of periodontal disease. Luminol-based electrochemiluminescence (ECL) immunosensors offer a promising approach for the fast and convenient detection of biomarkers. However, luminol’s low ECL efficiency under neutral conditions remains a challenge. This study developed an immunosensor by engineering an immunorecognition interface on the outer surface of mesoporous silica nanochannel film (SNF) and confining a Co3O4nanocatalyst within the SNF nanochannels to improve the luminol ECL efficiency. The SNF was grown on an indium tin oxide (ITO) electrode using the simple Stöber solution growth method. A Co3O4nanocatalyst was successfully confined within the SNF nanochannels through in situ electrodeposition, confirmed by X-ray photoelectron spectroscopy (XPS) and electrochemical measurements. The confined Co3O4demonstrated excellent electrocatalytic activity, effectively enhancing luminol and H2O2oxidation and boosting the ECL signal under neutral conditions. Using interleukin-6 (IL-6) as a proof-of-concept demonstration, the epoxy functionalization of the SNF outer surface enabled the covalent immobilization of capture antibodies, forming a specific immunorecognition interface. IL-6 binding induced immunocomplex formation, which reduced the ECL signal and allowed for quantitative detection. The immunosensor showed a linear detection range for IL-6 from 1 fg mL−1to 10 ng mL−1, with a limit of detection (LOD) of 0.64 fg mL−1. It also demonstrated good selectivity and anti-interference capabilities, enabling the successful detection of IL-6 in artificial GCF samples.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Xinxiang Wu,Jiaqi Li,Jijiang Li,Qianying Liang,Zena Wu,Fang Wan,Zhenguo Wu,Benhe Zhong,Yanxiao Chen,Xiaodong Guo
Lithium-sulfur (Li-S) batteries are promising for energy storage due to their high theoretical energy density and specific capacity. However, the polysulfide shuttle effect severely limits their performance. In this study, two-dimensional (2D) Co 3 O 4 /CoSe 2 heterostructures were synthesized to enhance polysulfide adsorption and catalysis through synergistic effects. The Co 3 O 4 /CoSe 2 heterostructure exhibited strong adsorption and catalytic activity, significantly improving the battery’s reaction kinetics. At a 1 C rate, the initial discharge capacity reached 958.22 mAh g −1 , with a capacity decay rate of only 0.04 % per cycle over 2000 cycles. At a 2 C rate, the initial capacity was 909.89 mAh g −1 , with a decay rate of 0.06 % over 1400 cycles. Under high temperature conditions (60 °C), the battery delivered an initial capacity of 990.47 mAh g −1 , with a single-cycle decay rate of 0.1 % after 200 cycles. At a low temperature (10 °C), the initial capacity was 1039.1 mAh g −1 , with a decay rate of 0.1 % per cycle after 200 cycles. Additionally, with a high sulfur loading of 3.54 mg cm −2 , the initial capacity reached 1041.8 mAh g −1 , retaining 385.96 mAh g −1 after 200 cycles. These results demonstrate the effectiveness of the Co 3 O 4 /CoSe 2 heterostructure in mitigating the polysulfide shuttle effect and improving the performance of Li-S batteries, offering new opportunities for advanced energy storage systems.
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高影响因子
ACS Applied Energy Materials
·
2025
·
IF 5.5
Kaixin Zhang,Zimu Li,Yeqiang Wang,Dajun Cui,Jiangxin Wang,Kuanhong Mei,Minmin Liu,Haoyang Dong,Yiman Zhang,Juan Zhang,Weiguo Xu,Shuo Li
The employment of Co-based cocatalysts in BiVO4 (BVO) photoanodes is still suffering from inefficient hole transfer to active sites and sluggish charge kinetic processes. To address this issue, we designed a hierarchical dual-shell Co@Co3O4@NC (Co-DS) cocatalyst synthesized via the controlled pyrolysis of CoCo Prussian blue analogs under micro-oxygen conditions. The designed hierarchical structure consists of a graphitic carbon shell that encases the Co3O4 interlayer, which is abundant in OER-active sites, coupled with a metallic Co core that enhances hole accumulation and charge transfer across interfaces. The optimized Mo-BVO/Co-DS photoanode achieves a photocurrent density of 4.95 mA/cm2 at 1.23 VRHE, representing a 129% enhancement over pristine BVO (2.16 mA/cm2). This work provides fundamental insights into the design principles of metal-oxide-based cocatalysts for overcoming efficiency limitations in photochemical water oxidation.
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高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Mengjie Zhang,Hong Xiao,Yang Liu,Wenshuo Hou,Xuting Li,Jianlin Deng,Linrui Hou,Changzhou Yuan
The sluggish redox kinetics and intrinsic dissolution of lithium polysulfides (LiPSs) critically hinder the desirable commercialization of Li-S batteries (LSBs). Purposeful modification of separators with multi-functional materials brings enormous room for both efficiently restraining the dissolution and enhancing the solid-liquid-solid conversion kinetics of LiPSs. For this, herein, hetero-architectured CoO-Co 3 O 4 hollow nanotubes (HNTs) are elaborately designed and fabricated via a self-sacrifice template methodology to modify the polypropylene (PP) separator for advanced LSBs. Besides the robust physico chemical adsorption, the endogenous CoO-Co 3 O 4 heterojunction, as authenticated by theoretical calculations and experimental verification, spontaneously creates an interfacial built-in electric field, which simultaneously enhances the active sites, accelerates the bi-directional sulfur conversion, and favors the fast electron/ion transport. Thanks to successful realization of the synergistic “electrostatic capture-energy barrier regulation-directional conversion” effect, LSBs with the hetero CoO-Co 3 O 4 HNTs modified PP separator exhibit significantly improved electrochemical performance with the long-duration cycling stability for 1000 cycles at 5 C, and a large capacity of 631.5 mAh g −1 even at a high sulfur loading (5 mg cm ‒2 ) and low electrolyte/sulfur ratio (8.0 µL mg −1 ). More essentially, our contribution here offers a viable avenue for up-and-coming hetero-catalyst functionalized separator platforms toward next-generation LSBs and beyond.
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高影响因子
CATALYSIS LETTERS
·
2022
·Vol. 153
·期 3
·779-789
·
IF 2.936
Guo Guangkai,Zhong Dazhong,Zhao Tao,Liu Guang,Li Jinping,Zhao Qiang
It is important to develop active, stable, and cost-effective electrocatalysts for highly efficient overall water splitting. Metal organic frameworks were considered as efficient precursors for overall water splitting catalysts. In this paper, NC/Ni–Co 3 O 4 @Co 1−x S with small size is obtained from ZIF-67. NC/Ni–Co 3 O 4 @Co 1−x S materials exhibit superior overall water splitting properties, with a low overpotential of 170 mV for the hydrogen evolution reaction at 10 mA cm −2 and 210 mV for the oxygen evolution reaction at 10 mA cm −2 and long-term stability. Furthermore, the overall water splitting only requires 1.64 V to drive the current density of 10 mA cm −2 , when the NC/ Ni–Co 3 O 4 @Co 1−x S are used as both anode and cathode. NC/Ni–Co 3 O 4 @Co 1−x S has excellent electrocatalytic activity due to its nanosheet structure, which greatly increases the electrochemically active surface area and the NC/Ni–Co 3 O 4 @Co 1−x S has good electrical conductivity and abundant Co 3+ sites, so the electrocatalytic activity is significantly enhanced. This study provides a new idea for the design and synthesis of novel composite electrocatalysts. Graphical
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高影响因子
Journal of Energy Chemistry
·
2024
·
IF 14
Ming-Hao Guan,Hao-Nan Xu,Jin Liu,Tao Wu,An-Hui Lu
Regulating the intermediates involved in the electrocatalytic nitrate reduction reaction (NO 3 RR) is crucial for the enhancement of reaction efficiency. However, it remains a great challenge to regulate the reaction intermediates through active site manipulation on the surface of the catalyst. Here, a family of n %-Co 3 O 4 /SiC ( n = 5, 8, 12, 20) catalysts with a delicate percentage of Co 2+ and Co 3+ were prepared for NO 3 RR. We found that Co 3+ primarily acts as the active site for NO 3 − reduction to NO 2 − , while Co 2+ is responsible for the conversion of NO 2 − to NH 3 . Moreover, the conversion of these intermediates over the active sites is autonomous and separately controllable. Both processes synergistically accomplish the reduction of nitrate ions to synthesize ammonia. Combining the experimental studies and density functional theory (DFT) calculations, it is discovered the pathway (*NHO→*NHOH→*NH 2 OH→*NH 2 →*NH 3 ) is more favorable due to the lower Δ G value (0.25 eV) for the rate-limiting step (*NO→*NHO). The NH 3 yield rate of 8%-Co 3 O 4 /SiC reached 1.08 mmol/(cm 2 h) with a Faradaic efficiency of 96.4% at −0.89 V versus the reversible hydrogen electrode (RHE), surpassing those of most reported non-noble NO 3 RR catalysts. This strategy not only provides an efficient catalyst for NO 3 RR but also serves as an illustrative model for the regulation of multi-step reaction intermediates through the design of distinct active sites, thereby presenting a new approach to enhance the efficiency of intricate reactions.
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