EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
·
2019
·Vol. 2019
·期 24
·2933-2939
·
IF 2.578
Xuefeng Hu,Zeshu Zhang,Yibo Zhang,Liwei Sun,Heyuan Tian,Xiangguang Yang
Graphical A Pt/Co 3 O 4 catalyst was prepared by the galvanic displacement method, which exhibited excellent catalytic activity for toluene combustion (T 90 = 150 °C at GHSV = 60 000 mL g –1 h – 1 ) and outstanding stability reflected in a continuous 100 h on-stream toluene combustion lifetime experiment without loss in catalytic activity. Catalytic combustion has become one of the most economical, feasible and effective tools for the abatement of VOCs. However, it is difficult to prepare supported Pt catalysts possessing both excellent catalytic activity and stability by traditional preparation methods, such as incipient-wetness impregnation method and nanoparticle loading method. In this work, we prepared Pt/Co 3 O 4 catalyst with high catalytic activity and stability for the catalytic combustion of toluene by galvanic displacement method. As comparing, additional reference samples were prepared using incipient-wetness impregnation method and nanoparticle loading method, respectively. All of the samples were characterized by XRD, TEM, H 2 -TPR, O 2 -TPD and XPS techniques. The catalyst prepared by galvanic displacement method exhibited the best catalytic activity with the temperature of 90 % toluene conversion about 150 °C (T 90 = 150 °C) and outstanding stability reflected in a continuous 100 h on-stream toluene combustion lifetime experiment without catalytic activity decline at the GHSV = 60 000 mL g –1 h –1 compared to which prepared by traditional methods. These results are attributed to the excellent oxygen mobility, the high surface chemisorbed oxygen species concentration and the strong interaction between Pt and support Co 3 O 4 . Therefore, our work provided a universal strategy for designing high-efficiency and stable catalyst for the abatement of VOCs at low temperature.
研究领域:
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Qiuyu Shen,Zhihui Lu,Fukun Bi,Dongfeng Zhang,Lijuan Li,Xiaodong Zhang,Yiqiong Yang,Minghong Wu
The synthesis method of precious metal catalysts would affect the electronic metal-support interaction (EMSI) of catalysts, which further affected the catalytic activity. In this paper, Co 3 O 4 was obtained as support by the pyrolysis of ZIF-67 as a template sacrificial agent, and Pt species were loaded by three different reduction methods. Among them, the catalyst produced by the NaBH 4 reduction method possessed the best activity with T 90 of 168 °C. Through a series of characterization and experiments, it was found that the EMSI of the catalyst was optimized by this synthesis method, which led to electron transfer among Pt species and Co 3 O 4 . The catalysts also exhibited excellent water resistance, stability, and recycling performance. The possible degradation mechanism of toluene was also revealed by in situ DRIFTS and GC–MS. This paper provided ideas for the construction of catalysts and a theoretical reference for the relevant verification of EMSI.
研究领域:
催化化学
·
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 10
·6316-6324
·
IF 12.732
Kun Xiang,Zhongxin Song,Dan Wu,Xiaohui Deng,Xuewan Wang,Wen You,Zhikun Peng,Lei Wang,Jing-Li Luo,Xian-Zhu Fu
Electrocatalytic seawater splitting has been considered as a transformative technology for industrial-scale hydrogen generation. However, the competition between the oxygen evolution reaction (OER) and chlorine evolution reaction (CER) at the anode with sluggish kinetics is the main bottleneck. Herein, an organic-oxidation-assisted strategy has been demonstrated, in which the thermodynamically favorable methanol selective oxidation reaction (MSOR) is used to suppress the undesired OER/CER using carbon paper supported Pt–Co3O4 electrocatalysts (denoted as Pt–Co3O4/CP), leading to hydrogen and value-added formate generation simultaneously with significantly low energy consumption. In the integrated two-electrode electrolyzer using Pt–Co3O4/CP bifunctional electrocatalysts, the required cell voltage at 10 mA cm−2 is only 0.555 V when adding 2.0 M methanol, which is 1022 mV lower than that in alkaline seawater. The integrated cell also produces hydrogen and formate simultaneously with high faradaic efficiency and considerable durability. The findings in this work represent a new direction for energy-saving production of hydrogen from seawater.
研究领域:
电化学
·
材料科学
·
可再生能源
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Mengyuan Jin,Xiang Han,Aitong Yang,Ting Chou,Tingting Chen,Yecan Pi,Shun Wang,Yun Yang,Juan Wang,Huile Jin
Interfacial engineering is considered an effective strategy to improve the electrochemical water-splitting activity of catalysts by modulating the local electronic structure to expose more active sites. Therefore, we report a platinum–cobaltic oxide nanosheets (Pt/Co3O4 NSs) with plentiful grain boundary as the efficient bifunctional electrocatalyst for water splitting. The Pt/Co3O4 NSs exhibit a low overpotential of 55 and 201 mV at a current density of 10 mA cm–2 for the hydrogen evolution reaction and oxygen evolution reaction in 1.0 M potassium hydroxide, respectively. A negligible degradation of 1.52 V at a current density of 10 mA cm–2 after continuous operation for 100 h, demonstrates the long-term stability of the catalyst. Furthermore, the overall water-splitting performance of the Pt/Co3O4 NSs surpasses that of the commercial Pt/C||RuO2. The density functional theory calculation results explain that the improvement of catalyst activity is attributed to the moderate adsorption/desorption energy of *H and the low reaction energy barrier of the rate-determining step. This work presents a novel vision to design bifunctional catalysts for the storage and conversion of hydrogen energy.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
PubMed
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
PLASMA SCIENCE & TECHNOLOGY
·
2023
·Vol. 25
·期 10
·104003
·
IF 1.7
Shucheng DI,Jiacheng XU,Shuiliang YAO,Jing LI,Zuliang WU,Erhao GAO,Jiali ZHU,Lianxin DAI,Weihua LIU,Buhe ZHANG,Junwei ZHANG
The plasma catalytic degradation of o-xylene in simulated air was improved by loading low amounts of Pt, Pd, or Au onto Co3O4. At room temperature, o-xylene conversion and COx selectivity using a 0.1 wt% Pt/Co3O4 catalyst reached 98.9% and 80%, and the energy efficiency was at the top level in comparison with values in the literature. A stable o-xylene degradation performance could be obtained by online regenerating the heat-insulated reactor with a high energy density. After characterization, it was found that the loading of nanosized Pt not only increased the Co3+/Co2+ ratio, where the Co3+ benefitted the formation of reactive oxygen species, but also conduced Pt0 to oxygen activation, resulting in effective promotion of complete o-xylene oxidation. Operando plasma diffuse reflectance infrared Fourier transform spectroscopy demonstrated the complete o-xylene oxidation and proved that Pt played a key role in the complete oxidation of o-xylene.
研究领域:
环境科学
·
催化
·
等离子体化学
✓ 已验证
DOI
高影响因子
ACS Omega
·
2026
·Vol. 11
·期 32
·47638-47653
·
IF 5.2
Liu Yanchi,Sun Mohan,Qian Chengchao,Fu Yabo,Qiao Junwei,Wang Diangang,Shi Jiazi,Zhang Gaimei,Zhang Xinlin,Liu Hui
To overcome the poor
visible light response and high
recombination
rate of photogenerated carriers in bare TiO 2 , a Pt/Co 3 O 4 /TiO 2 photocatalyst was fabricated
via a template-assisted spontaneous galvanic replacement route. The
as-prepared material contains anatase–rutile mixed-phase TiO 2 , Co 3 O 4 , and metallic Pt and retains
a dodecahedral morphology with a high specific surface area of 122.64
m 2 /g. Under visible light irradiation for 120 min, its
degradation rates for tetracycline and methylene blue reached 85%
and 93%, respectively, which are significantly better than those of
pure TiO 2 and Pt/Co 3 O 4 . The composite
also exhibited excellent stability and recyclability. Its superior
performance is ascribed to the synergistic effects of the mixed-phase
TiO 2 , the p–n heterojunction between TiO 2 and Co 3 O 4 , the Schottky barrier at the Pt/TiO 2 interface, the localized surface plasmon resonance of Pt,
and the high adsorption capacity of the porous material. This work
offers a new strategy for treating dye- and antibiotic-containing
wastewater.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ANALYTICA CHIMICA ACTA
·
2021
·
IF 6.558
Yiwei Liu,Xiaopeng Hu,Yide Xia,Faqiong Zhao,Baizhao Zeng
In this work, a novel signal on/off ratiometric electrochemical sensor for the selective detection of chlorpromazine (CPZ) was developed. The sensor was constructed by electrodepositing dual-monomer molecularly imprinted polymer (DMMIP) film on the surface of Pt/Co 3 O 4 nanoparticles modified glassy carbon electrode, using CPZ as template molecule, methylene blue and catechol as functional monomers. The copolymerization of two monomers increased the diversity of functional groups for binding template molecules, and enhanced stability. The quantitative detection of CPZ was performed by differential pulse voltammetry, using the peak current of poly (methylene blue) as reference signal and the peak current of CPZ as indicating signal. The results showed that the developed DMMIP sensor not only possessed high selectivity and sensitivity, but also exhibited satisfactory anti-interference ability. Under the optimum conditions, a linear detection range of 0.005–9 μmol L −1 (R 2 = 0.9962) was obtained, and the limit of detection was 2.6 nmol L −1 . Moreover, the sensor showed good reproducibility and stability toward CPZ detection. It was applied to detect CPZ in serum and pharmaceutical samples, and satisfactory recoveries (ranging from 95.3% to 108.0%) were achieved.
研究领域:
分析化学
·
电化学
·
药物检测
✓ 已验证
产品关联
DOI
PubMed
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
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