CHEMICAL PHYSICS LETTERS
·
2019
·
IF 1.901
Xiaoyan Zhang,Xiumei Cheng,Feng Chen,Li Xu,Yaping Wang,Junchao Qian,Zhengying Wu,Qi Zhang
One of the crucial issues in fuel cells is to explore the highly-efficient, long-term stable and low-cost catalysts for the oxygen reduction reaction (ORR). Here, the carbon dots/Co 3 O 4 (CDs/Co 3 O 4 ) is reported as an effective electrocatalyst for ORR. The CDs/Co 3 O 4 was synthesized through an in-situ two-step heating strategy with the graphitic carbon nitride (g-C 3 N 4 ), cobalt nitrate hexahydrate and organic base as raw materials. The carbon dots (CDs) are derived from the C source of g-C 3 N 4 , which are in situ introduced into the Co 3 O 4 to form the CDs/Co 3 O 4 composite. Consequently, the introduction of CDs endows enhanced electrocatalytic activity of the CDs/Co 3 O 4 composite.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Communications
·
2021
·
IF 3.383
Mingyuan Ren,Xu Yang,Han Ye,Yichi Zhang,Shan Hou,Guoxu Zheng
Carbon materials have the characteristics of stable structure, good mechanical properties, large specific surface area, and numerous reactive sites; however, they are characterized by low volumetric specific capacity, poor cycle stability, and poor electrochemical performance, which restricts their application in energy storage. In this study, three-dimensional graphene oxide (3DGO) as a carbon substrate material was combined with Co-MOF precursors to prepare carbon-based composite materials, and the influence of the microstructure of the composite on its electrochemical performance was investigated. The 3DGO/Co 3 O 4 nanosheet array composite material had a radial size of about 2 µm and a longitudinal size of about 20 nm. The arrays were staggered to form a porous structure, and the pore size was 0.2–2 µm. After 30 cycles, the Rct decreased to 50 Ω, from 140 Ω. The specific discharge capacity of the first cycle reached 800 mAh g −1 , and the specific discharge capacity remained at 280 mAh g −1 at a high current density of 1000 mA g −1 . The 3D porous structure improved the lithium storage capacity and rate performance of the material. After the cycling experiment, a crosslinked structure appeared on the top of the electrode material nanosheets.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Hongji Peng,Xiaoliang Zhang,Bingrong Wang,Yang Cao,Mingyu wang,Delun Chen,Xiaohong wang,Jinchun Tu
In seawater electrolysis for hydrogen production, the competition between chlorine evolution and oxygen evolution reaction (OER) at the anode limits its hydrogen yield and system stability. To address this, we optimized the anode material by modulating the surface electronic structure of the active sites of Co 3 O 4 using atomic layer deposition (ALD) technology. By introducing the atomic layers of NiO x species, this approach results in the synthesis of a NiO x @Co 3 O 4 /Carbon cloth (CC) heterojunction, which serves as an effective oxygen evolution reaction electrocatalyst for high-performance seawater electrolysis. Adjusting the deposition cycles creates unique material interfaces that facilitate the transformation of reaction intermediate. The NiO x @Co 3 O 4 /CC heterostructure demonstrates superior catalytic performance over single-phase materials, which is attributed to its unique Ni-O-Co interface, showing low overpotentials of 204 mV in alkaline freshwater and 235 mV in seawater solutions at 10 mA cm −2 , 285 mV in alkaline freshwater and 329 mV in seawater solutions at 100 mA cm −2 . In addition, the incorporation of NiO x endowed the material with enhanced overall durability and corrosion resistance, reducing Cl-related species adsorption. After 300 h of chronoamperometric testing, the voltage remained stable, indicating its potential as an ideal electrocatalyst for seawater electrolysis under alkaline conditions.
研究领域:
材料科学
·
电化学工程
·
能源技术
✓ 已验证
DOI
高影响因子
ACS Sensors
·
2025
·
IF 9.1
Tianrun Zheng,Yi Lu,Yilin Wang,Hong Zhou,Kang Yang,Mingxue Zhang,Yueying Liu,Fengmin Liu,Geyu Lu
Optimizing and improving the surface activity of Co3O4 sensing materials are crucial for applications in triethylamine detection. Herein, indium-doped Co3O4 hollow microflowers (InCo HMfs), assembled from ultrathin nanosheets, were prepared via a hydrolysis reaction. Three distinct crystal facets─{1 1 0}, {1 1 1}, and {0 0 1}─were observed in 2-InCo HMfs. Results from TEM, XPS, and XAS characterization show that the increase of Co2+ content induced by indium doping promotes the formation of highly active crystal planes in Co3O4. DFT calculations revealed the reasons for the improvement in the gas sensing performance of 2-InCo HMfs and the multiple effects of In ions. Our dual strategy of doping with indium and hydrolysis markedly improved the intrinsic TEA sensing performance of Co3O4, offering a novel avenue for designing high-performance TEA sensors.
研究领域:
材料科学
·
化学传感器
·
表面化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2018
·Vol. 124
·期 2
·1-5
·
IF 1.604
Yuan Hongwen,Ma Chi,Geng Junlong,Zhang Liqiang,Cui Hai,Liu Cunzhi
Calcium ion (Ca 2+ ) is an important ion involved in body life activities, and its content detection in biomedical field owns great significance. In this study, we fabricated Co 3 O 4 conical nanotube on F-doped tin oxide (FTO) substrate for detecting Ca 2+ . Co 3 O 4 is fabricated through a hydrothermal method and demonstrates a regular hexagon structure, with a length of 5–10 μm and wall thickness of 30 nm. The structure and morphology of Co 3 O 4 were characterized by X-ray diffraction (XRD), scanning electron microscope, and transmission electron microscopy, respectively. In addition, then, we used electrochemical technique to characterize the Ca 2+ concentration in the simulated body fluid. The detection of Ca 2+ is originated from the electrochemical reaction of hydrogen peroxide using Co 3 O 4 as a catalyst, in which Ca 2+ plays a significant role for accelerating the decomposition of hydrogen peroxide catalytic performance. By monitoring the electron transfer signals changes during the electrochemical reaction, we can quickly quantify the Ca 2+ concentrations. It is found that this Ca 2+ sensor owns a wide detection range (0.1–1.1 mM), a low detection limit (3.767 μM), and good anti-interference ability.
研究领域:
材料科学
·
生物医学工程
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电化学
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale
·
2017
·Vol. 9
·期 17
·5467-5474
·
IF 7.367
Yue Sun,Yunjie Zhou,Cheng Zhu,Lulu Hu,Mumei Han,Aoqi Wang,Hui Huang,Yang Liu,Zhenhui Kang
Highly efficient electrocatalysts remain huge challenges in direct methanol fuel cells (DMFCs). Here, a Pt–Co3O4–CDs/C composite was fabricated as an anode electrocatalyst with low Pt content (12 wt%) by using carbon dots (CDs) and Co3O4 nanoparticles as building blocks. The Pt–Co3O4–CDs/C composite catalyst shows a significantly enhanced electrocatalytic activity (1393.3 mA mg−1 Pt), durability (over 4000 s) and CO-poisoning tolerance. The superior catalytic activity should be attributed to the synergistic effect of CDs, Pt and Co3O4. Furthermore, the Pt–Co3O4–CDs/C catalyst was integrated into a single cell, which exhibits a maximum power density of 45.6 mW cm−2, 1.7 times the cell based on the commercial 20 wt% Pt/C catalyst.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2021
·
IF 7.46
Sheng-Xun Cai,Xian-Qiang Song,Zong-Tao Chi,Yong-Qing Fu,Zheng-Tao Fang,Sun-Ying-Yue Geng,Ya-Ru Kang,Xiao-Xu Yang,Jian-Feng Qin,Wan-Feng Xie
Gas sensors based on metal oxide semiconductors (MOSCs) and reduced graphene oxide (rGO) for sensing of organic volatile compounds often suffer from high operation temperature, low responses, poor selectivity, or narrow detection range. Herein, we design and fabricate Bi-doped rGO/Co 3 O 4 (BGCO) nanohybrids with a flower morphology, which have been applied as a sensing layer for an ethanol sensor. This BGCO sensor exhibits a maximum p -type response of 178.1 towards 500 ppm ethanol at an optimum working temperature of 120 °C. The sensor’s detection range for the ethanol concentration is from 500 ppb to 500 ppm, and the sensor has an excellent selectivity to ethanol compared to other types of organic volatile gases and oxidizing gas such as NO 2 . The enhanced ethanol sensing mechanism is attributed to the increased conductivity of Bi doped rGO/Co 3 O 4 material. Additionally, incorporation of Bi dopant can promote the redox reaction, and the rGO/Co 3 O 4 act as the catalyst.
研究领域:
材料科学
·
传感器技术
✓ 已验证
DOI
高影响因子
IONICS
·
2017
·Vol. 24
·期 6
·1595-1602
·
IF 2.062
Zhou Rihui,Chen Yaqin,Fu Yuanyuan,Li Yanfei,Chen Shouhui,Song Yonghai,Wang Li
A dandelion-like mesoporous Co 3 O 4 was fabricated and employed as anode materials of lithium ion batteries (LIBs). The architecture and electrochemical performance of dandelion-like mesoporous Co 3 O 4 were investigated through structure characterization and galvanostatic charge/discharge test. The as-prepared dandelion-like mesoporous Co 3 O 4 consisted of well-distributed nanoneedles (about 40 nm in width and about 5 μm in length) with rich micropores. Electrochemical experiments illustrated that the as-prepared dandelion-like mesoporous Co 3 O 4 as anode materials of LIBs exhibited high reversible specific capacity of 1430.0 mA h g −1 and 1013.4 mA h g −1 at the current density of 0.2 A g −1 for the first and 100th cycle, respectively. The outstanding lithium storage properties of the as-prepared dandelion-like mesoporous Co 3 O 4 might be attributed to its dandelion-like mesoporous nanostructure together with an open space between adjacent nanoneedle networks promoting the intercalation/deintercalation of lithium ions and the charge transfer on the electrode. The enhanced capacity as well as its high-rate capability made the as-prepared dandelion-like mesoporous Co 3 O 4 to be a good candidate as a high-performance anode material for LIBs.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Huan Wang,Yanming Liu,Zhonghua Sun,Jianhai Ren,Xiaoran Zou,Chun-Yang Zhang
Oxygen evolution reaction (OER) plays important roles in energy storage and conversion technologies, but the sluggish kinetics of OER may result in a large overpotential, and thus there is urgent need for the exploration of new electrocatalysts with a low overpotential and good stability. In this research, we integrate the melamine-assisted alkaline cobalt carbonate (CoCH) nanosheets pyrolysis with high-temperature solid phase fusion to construct the 1-C 3 N 4 /Co 3 O 4 /Ni foam hybrid electrode with Co 3 O 4 ultrathin porous nanosheets as the host, trace C 3 N 4 as the guest, and Ni foam (NF) as the current collector. Benefiting from the unique structure, the obtained 1-C 3 N 4 /Co 3 O 4 hybrid nanosheets can significantly reduce the charge transfer distance between the catalysts to electron collector and improve the electron transportation during the OER process. Moreover, the intimate interaction of Co 3 O 4 with C 3 N 4 can induce a charge redistribution at the interface. Consequently, the 1-C 3 N 4 /Co 3 O 4 /NF hybrid electrode exhibits an enhanced OER performance (166 mV at 10 mA•cm −2 ) and good stability, superior to the commercial RuO 2 particles and the reported transition metal-based electrocatalysts.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Dehao Kong,Weirong Zhou,Jiayin Han,Yubing Gao,Yuan Gao,Liupeng Zhao,Peng Sun,Geyu Lu
Crystal facet engineering strategy is an effective way to regulate the exposed facets, which affect the ability of the surface to adsorb and react with gas molecules, ultimately enhancing the gas-sensing properties. In this work, Co 3 O 4 mesoporous nanosheets with dominant exposed {1 1 1} facets (Co 3 O 4 -60) or {1 1 2} facets (Co 3 O 4 -100) were synthesized by simply adjusting the condensation-reflux temperature. The sensing results toward toluene show that Co 3 O 4 -60 exhibited superior performance. According to the crystal structure analysis and work function calculations, the (1 1 1) facet composed of Co 2+ would adsorb more oxygen molecules, which have been proved by experimental characterization, facilitating the sensing efficiency. The results of X-ray photoelectron spectroscopy indicated that Co 3 O 4 -60 possesses a higher Co 2+ content and chemisorbed oxygen ratio (52.9%). Furthermore, Co 3 O 4 -60 has a high electrical conductivity and a minor apparent activation energy for toluene (38.75 kJ/mol). The gas sensor based on Co 3 O 4 -60 exhibited a response of 20.6 for 100 ppm toluene with rapid recovery and a detection limit of 1 ppm. Besides, other properties such as selectivity, repeatability, and humidity resistance were evaluated. This work evidences that crystal facet engineering is a practical approach to improving the gas-sensing properties of pure-phase Co 3 O 4 .
研究领域:
材料科学
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
CATALYSIS LETTERS
·
2022
·Vol. 153
·期 4
·965-977
·
IF 2.936
Zhang Tong,Zhao HuaHua,Yang Jian,Zhao Jun,Yan Liang,Chou Lingjun,Song Huanling
Selective hydrogenation of crotonaldehyde to crotyl alcohol over PDA (polydopamine) modified Co 3 O 4 supported Pt catalysts was investigated in liquid phase. The catalysts which contain PDA and Co 3 O 4 lead to the formation of two kinds of interfaces: Pt-PDA and Pt-Co 3 O 4 , which greatly improves the performance in the hydrogenation of crotonaldehyde. TEM results reveal that the Pt nanoparticles of Pt/Co 3 O 4 @PDA have a smaller size and better dispersion than Pt/Co 3 O 4 . XPS, FT-IR and CO-DRIFTs results indicate that the addition of PDA decreases the electron density of Pt which is favor to the hydrogenation of C=O in crotonaldehyde. The characterization results demonstrate that the interaction between Pt and PDA creates new active interfacial sites and the synergy of Pt-PDA and Pt-Co 3 O 4 is responsible for the excellent performance. Graphical Abstract
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2019
·
IF 2.781
Jianli Tao,Meng Zhang,Xiang Gao,Hao Zhao,Zhenpeng Ren,Donghui Li,Jiaojiao Li,Ruiqin Zhang,Yonggang Liu,Yunpu Zhai
Co 3 O 4 /red phosphorus (Co 3 O 4 /RP) photocatalysts were synthesized via facile hydrothermal and mechanically grinding approach. The catalysts were characterized via XRD , TEM , XPS , N 2 sorption , photoelectro chemical measurements and UV–vis DRS . The results showed that the Co 3 O 4 nanocrystals were assembled on the surface of the RP. The loading of Co 3 O 4 on RP was beneficial to enhance the light absorption compared with pure RP. Under visible light , 94.5% of malachite green (MG) can be photodegraded within 20 min over 10% Co 3 O 4 /RP composite, while only 17.3% and 59.9% of MG can be photodegraded over pure Co 3 O 4 and RP. The reaction rate constant k obtained over 10% Co 3 O 4 /RP heterojunction (0.1464 min −1 ) is approximately 3.2 times that of pure RP (0.0457 min −1 ), and 15.3 times that of bare Co 3 O 4 (0.0096 min −1 ). The cycle experiments showed that the catalyst had high photocatalytic stability. Co 3 O 4 nanocrystals inhibit the photoelectron-hole pair recombination of red phosphorus semiconductor, and exhibit improved visible light absorption . Consequently, the catalytic performance of Co 3 O 4 /RP has been enhanced under visible light .
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）