Materials Chemistry Frontiers
·
2024
·Vol. 8
·期 10
·2282-2292
·
IF 6
Congcong Lu,Yu Yang,Songjun Li,Maiyong Zhu
Because of their superior power and energy densities, supercapacitors have garnered considerable amounts of attention in energy storage technologies. Co3O4 is considered as a regularly used electrode material for supercapacitors because of its high theoretical capacitance and outstanding electrochemical activity. However, owing to the Co3O4 electrode materials’ rapid capacity decay and low intrinsic conductivity, it is challenging to achieve high theoretical capacitance. As a result, doping Co3O4 with metal components can enhance its electrical and surface characteristics while also raising its conductivity. Through a straightforward hydrothermal reaction and subsequent thermal decomposition, a series of Fe doping into Co3O4 has been successfully realized in this paper. This generates a nanosheet floral cluster structure and exposes more active sites, and the two metal elements work in concert to improve the capacitance performance. The electrochemical performance of the Co-0.2Fe-450 electrode material appears satisfactory when the doping amount of Fe is 0.2 mmol and its thermal decomposition temperature is 450 °C. The specific capacitance at 1 A g−1 is 680 F g−1. The capacitance retention rate at 10 A g−1 current density after 5000 charge–discharge cycles is 84.67%. Notably, the assembled asymmetric supercapacitor retains 105.5% of its capacitance after 5000 cycles and has a power density of 803.13 W kg−1 and an energy density of 17.78 W h kg−1. Fe-doped Co3O4 has a strong future in energy storage, as evidenced by its exceptional electrochemical characteristics.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Kailin Wang,Songyu Yang,Yan Wu
Dual cocatalysts play an important role in photocatalytic water splitting to hydrogen production . In this paper, Fe-doped Co 3 O 4 (Fe-Co 3 O 4 ) and Pt were loaded on the surface of g -C 3 N 4 to enhance the water photocatalytic splitting, in which Fe-Co 3 O 4 was used as an oxidation cocatalyst to capture the photo-generated holes of g -C 3 N 4 , and Pt was used as a reduction cocatalyst to transfer photo-generated electrons. Under the irradiation of visible light, its hydrogen production rate reaches up to 3.015 mmol g −1 h −1 , which is 3.01 times higher than that of g -C 3 N 4 loaded with Pt. Pt and Fe-Co 3 O 4 dual cocatalysts not only promote the migration rate of photo-generated electrons and holes on the surface of g -C 3 N 4 , but also improve the light absorption capacity of visible light. The interfacial electric field built from the p-n heterojunction of Fe-Co 3 O 4 / g -C 3 N 4 drives photo-generated electrons in Fe-Co 3 O 4 flowing to the holes of g -C 3 N 4 , which further inhibiting the recombination of g -C 3 N 4 photo-generated carriers. This work provides a reference for the development of high-efficiency photocatalyst and an effective support for the development of semiconductor cocatalyst.
研究领域:
材料科学
·
化学
·
可再生能源
·
催化
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2024
·
IF 4.2
Qi Ding,Hairong Li,Weining Liu,Dandan Huang,Xi Tan,Mingyang Zhao,Qionglin Cheng,Ming Yi,Yaqian Ren
Triethylamine (TEA) is easily volatilized and poses a huge health hazard. Therefore, the rapid detection of TEA is of great significance in environmental protection and industrial applications. In this paper, coral flower-like Fe-doped Co 3 O 4 was prepared using Co-MOF-74 as precursor. Compared with the pure Co 3 O 4 , Co 3 O 4 doped with 2 mol% Fe has better gas sensing performance of TEA. At an optimum operating temperature of 199 °C, the response to 100 ppm TEA is 21.2, five times higher than that of the pure Co 3 O 4 , with a short response recovery time (13 s/15 s). In addition, the gas sensor exhibits a certain selectivity and anti-humidity stability, with a minimum detection limit of 1 ppm at operating temperature. The higher Co 2+ /Co 3+ content in the sensor promotes the reaction of TEA with ionized oxygen, and amplifies the resistance change by adjusting the carrier concentration. Meanwhile, the introduction of Fe enriches the content of vacant oxygen and provides sufficient sites for the reaction and diffusion of TEA, further enhancing the sensing performance. In addition, Co 3 O 4 and Fe 2 O 3 combine to form p-n heterojunction , which helps to accelerate the gas adsorption-desorption process and improve the sensitive response speed. It creates a new design idea for the rapid detection of TEA gas by P-type metal-oxide semiconductors at relatively low operating temperatures.
研究领域:
材料科学
·
环境科学
·
化学工程
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2023
·Vol. 52
·期 7
·4951-4958
·
IF 2.1
Mu Guili,Zhou Jinglin,Ye Beirong,Zhang Tengfei,Li Chen,Zhao Qiang
The development of efficient, long-lasting, low-cost, and environment friendly electrocatalysts for oxygen evolution reactions (OER) is imminent in many energy storage and conversion devices. Here, a unique electrocatalyst of Fe-doped Co 3 O 4 particles loaded on carbon nanotubes (Fe-doped Co 3 O 4 /CNT/NF) was synthesized by a one-step flame method. This method significantly reduces the reaction time (the whole flame process just maintain ~ 10 s). The doping of iron significantly enhances the activity of the OER, as demonstrated by a reduced overpotential of 232 mV to achieve 10 mA cm −2 , a tiny Tafel slope (34.1 mV dec −1 ), and long-lasting durability in an alkaline electrolyte. This work provides a potential possibility for large-scale industrial production. Graphical Abstract The carbon nanotubes attached with Fe-doped and Co 3 O 4 nanoparticles were generated in situ by a simple and reliable one-step flame method. Fe-doped and Co 3 O 4 nanoparticles were immobilized on the surface of the carbon nanotubes, resulting in Co being able to expose more active edges. As a result, the newly designed Fe-doped Co 3 O 4 /CNT/NF exhibits lower overpotential and Tafel slope. The low cost of the basic materials in this design and the easy and fast preparation method ensure that it can be produced on a large scale.
研究领域:
材料科学
·
电化学
·
能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）