Fabrication of Co3O4/PEI-GO composites for gas-sensing applications at room temperature

Zhang, Xinci; Zhong, Hua; Xu, Lai-Di; Wang, Shuhong; Chi, Huanzhe; Pan, Qing‐Jiang; Guo, Zihao

doi:10.1016/j.materresbull.2018.02.025

Cited by 21 publications

(3 citation statements)

References 43 publications

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“…PEI provided high-density homogeneous functional groups on the CNTs' sidewalls for binding Co 3 O 4 nanoparticles. Meanwhile, PEI is helpful for highdensity dispersion of Co 3 O 4 grains and enhances the interaction between Co 3 O 4 grains and CNTs and improves the transport of the carriers to the surface [39,40]. Therefore, it could be concluded that the PEI played an important role in the sensing performance of the nanocomposites.…”

Section: Gas Sensingmentioning

confidence: 96%

Highly Sensitive H₂ Sensors Based on Co₃O₄/PEI‐CNTs at Room Temperature

Gao

et al. 2022

Journal of Nanomaterials

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The highly dispersed Co3O4 on the surface of CNTs modified with polyethylenimine (PEI) was synthesized using the hydrothermal method. In the CNT-Co3O4 composite materials, CNTs not only provide the substrate for the Co3O4 nanoparticles but also prevent their aggregation. Furthermore, the interaction between Co3O4 and CNTs modified with polyethylenimine (PEI) helps to improve the gas sensing performance. In particular, the CNT-Co3O4 composite synthesized at 190°C shows the outstanding sensitive characteristics to H2 with a lower detection limit of 30 ppm at room temperature. The obtained CNT-Co3O4 sensor displays excellent selectivity and stability to H2. The energy band model of the conductive mechanism has been built to explain the resistance change when the gas sensor is exposed to the H2. Hence, the CNT-Co3O4 composite material presents highly promising applications in H2 gas sensing.

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Section: Gas Sensingmentioning

confidence: 96%

Highly Sensitive H₂ Sensors Based on Co₃O₄/PEI‐CNTs at Room Temperature

Gao

et al. 2022

Journal of Nanomaterials

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“…GO nanosheets decorated with metal oxide nanoparticles combine the outstanding features of each because of the synergistic effect between them. Metal oxide semiconductors, such as tin oxide (SnO 2 ) [4], titanium dioxide (TiO 2 ) [5], zinc oxide (ZnO) [6], copper oxide (CuO) [7], tungsten oxide (WO 3 ) [8,9], indium oxide (In 2 O 3 ) [10], molybdenum sulfide (MoS 2 ) [11], ferric oxide (Fe 2 O 3 ) [12], and cobalt oxide (Co 3 O 4 ) [13] possess many outstanding advantages such as high sensitivity, fast response/recovery times, and low cost, such that they are often used as important materials for gas sensors. The synergistic effects of graphene hybridization with metal oxides revealed high levels of electrochemical properties, helping to improve the selectivity and sensitivity of the electrochemical sensor.…”

Section: Introductionmentioning

confidence: 99%

In Situ Deposition of Reduced Graphene Oxide on Ti Foil by a Facile, Microwave-Assisted Hydrothermal Method

et al. 2022

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Reduced graphene oxide (rGO) was successfully deposited in situ onto Ti foil via a microwave-assisted hydrothermal method for the development of Ti-TiO2-rGO composite structures. The TiO2 crystallin layer was produced by the thermal oxidation of titanium foil in the presence of 0.5 M hydrofluoric acid in a controlled atmosphere consisting of a mixed flow gas of Ar and O2 at 500 °C. A great advantage of using the microwave-assisted hydrothermal method for obtaining composite structures is the fast and uniform heating mode, which prevents the aggregation of graphene layers. Specific analyses, such as X-ray diffraction, UV-VIS analysis, and SEM morphology, were used to investigate the structural, optical, and morphological characteristics of the composites. The I-V measurements of the Ti-TiO2-rGO composite structures were performed using forward bias with an applied voltage between −3 V and +3 V and a step rate of 10 mV/s. Moreover, the electrochemical behavior was obtained by cyclic voltammetry in a 1 M KNO3 supporting electrolyte and in the presence of 4 mM K3Fe(CN)6 to determine the electroactive surface area and apparent diffusion coefficient. The charge transfer resistance was investigated via electrochemical impedance spectroscopy (EIS) in a 0.1 M Na2SO4 supporting electrolyte and within a frequency range of 100 kHz to 0.1 Hz to confirm the role of rGO on the electrode’s surface. This study provided new insights into the development of high-performance and cost-effective Ti-TiO2-rGO structures both for the development of electrochemical electrodes and gas sensors.

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“…Literatürde farklı yapısal ve morfolojik özelliklere sahip Co3O4 elde etmek için çöktürme tekniği (Uddin and Baig, 2019), termal ayrışma (Salavati-Niasari et al, 2009), püskürtme yöntemi (Shinde et al, 2006), sol-jel (Vennela et al, 2019) ve hidrotermal sentez (Jin et al, 2014) gibi çeşitli yöntemler mevcuttur. Bunlar arasında hidrotermal sentez, spinel Co3O4 ve Co3O4-tabanlı nanomalzemelerin hazırlanmasında sıklıkla kullanılan, verimli ve doğrudan bir sentez yöntemidir (Rajeshkhanna et al, 2017;Zhang et al, 2018;Yuan et al, 2019). Genel olarak, elektrokimyasal uygulamalar için geliştirilen elektrot malzemelerinin temel özellikleri arasında; yüksek yüzey alanı, uygun gözeneklilik, küçük parçacık boyutu ve uygun morfoloji bulunur.…”

Section: Introductionunclassified

Co3O4/Ni Köpük Nanokompozitlerinin Doğrudan Metanol Yakıt Hücresinde Elektrot Malzemesi Olarak Kullanımı

Urhan

2021

Iğdır Üniversitesi Fen Bilimleri Enstitüsü Dergisi

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Bu çalışmada, nikel köpük üzerindeki Co3O4 nano-iğne dizileri (Co3O4/Ni köpük), basit tekkap hidrotermal yöntemle sentezlenmiş ve ardından tek aşamalı ısıl işlem uygulanmıştır. Co3O4/Ni köpük nanokompozitlerinin yapısal ve morfolojojik analizleri; X-ışını kırınım spektroskopisi (XRD) ve alan emisyonlu taramalı elektron mikroskobu (FESEM) ile karakterize edilmiştir. Alkali çözeltide Co3O4/Ni köpük üzerinde metanolün elektrokimyasal oksidasyonu, dönüşümlü voltametri (CV) ve kronoamperometri (CA) teknikleri ile incelenmiştir. Düşük başlangıç potansiyeli (270 mV), yüksek akım yoğunluğu (67 mA cm -2 ) ve uzun elektro-oksidasyon kararlılığı (%86) ile Co3O4/Ni köpük mükemmel elektrokatalitik performans göstermiştir. Böylece, sentezlenen nanokompozitin doğrudan metanol yakıt hücreleri için yüksek performanslı platinsiz elektrokatalizörlere mükemmel bir aday olabileceği saptanmıştır.

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Fabrication of Co3O4/PEI-GO composites for gas-sensing applications at room temperature

Cited by 21 publications

References 43 publications

Highly Sensitive H₂ Sensors Based on Co₃O₄/PEI‐CNTs at Room Temperature

Highly Sensitive H₂ Sensors Based on Co₃O₄/PEI‐CNTs at Room Temperature

In Situ Deposition of Reduced Graphene Oxide on Ti Foil by a Facile, Microwave-Assisted Hydrothermal Method

Co3O4/Ni Köpük Nanokompozitlerinin Doğrudan Metanol Yakıt Hücresinde Elektrot Malzemesi Olarak Kullanımı

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Fabrication of Co3O4/PEI-GO composites for gas-sensing applications at room temperature

Cited by 21 publications

References 43 publications

Highly Sensitive H2 Sensors Based on Co3O4/PEI‐CNTs at Room Temperature

Highly Sensitive H2 Sensors Based on Co3O4/PEI‐CNTs at Room Temperature

In Situ Deposition of Reduced Graphene Oxide on Ti Foil by a Facile, Microwave-Assisted Hydrothermal Method

Co3O4/Ni Köpük Nanokompozitlerinin Doğrudan Metanol Yakıt Hücresinde Elektrot Malzemesi Olarak Kullanımı

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Highly Sensitive H₂ Sensors Based on Co₃O₄/PEI‐CNTs at Room Temperature

Highly Sensitive H₂ Sensors Based on Co₃O₄/PEI‐CNTs at Room Temperature