نتایج جستجو برای: nitrogen doped graphene sheet

تعداد نتایج: 248428  

Journal: :Chemical communications 2015
Chao Hu Chang Yu Mingyu Li Xiuna Wang Qiang Dong Gang Wang Jieshan Qiu

An all-carbon hybrid, composed of coal-based nitrogen-doped carbon dots decorated on graphene, was prepared via hydrothermal treatment. The hybrid possesses comparable electrocatalytic activity, better durability and methanol tolerance than those of the commercial Pt-based electrocatalysts for oxygen reduction reaction, indicative of its great potential in fuel cells.

Journal: :Chemical communications 2014
Mojtaba Mahyari Mohammad Sadegh Laeini Ahmad Shaabani

Copper(ii) tetrasulfophthalocyanine supported on three-dimensional nitrogen-doped graphene-based frameworks was synthesized and introduced as a bifunctional catalyst for selective aerobic oxidation of alkyl arenes and alcohols to the corresponding carbonyl compounds. The ease of catalyst separation, high turnover, low catalyst loading and recyclability could potentially render it applicable in ...

2013
Qinggang He Qing Li Samson Khene Xiaoming Ren Franz E. Loṕez-Suaŕez Dolores Lozano-Castello Agustín Bueno-Loṕez Gang Wu

A new nanocomposite catalyst consisting of high-loading cobalt oxide (CoO) on nitrogen-doped reduced graphene oxide (rGO) for oxygen reduction reaction (ORR) was prepared in this work. Its high activity for the ORR in alkaline electrolyte was determined using the rotating disk electrode technique, and further confirmed in real alkaline membrane fuel cells. A combination of physicochemical chara...

2016
Zhong-Jie Jiang Zhongqing Jiang

Nitrogen doped graphene hollow microspheres (NGHSs) have been used as the supports for the growth of the CoO nanoparticles. The nitrogen doped structure favors the nucleation and growth of the CoO nanoparticles and the CoO nanoparticles are mostly anchored on the quaternary nitrogen doped sites of the NGHSs with good monodispersity since the higher electron density of the quaternary nitrogen fa...

2014
Dan Qu Min Zheng Ligong Zhang Haifeng Zhao Zhigang Xie Xiabin Jing Raid E. Haddad Hongyou Fan Zaicheng Sun

Photoluminescent graphene quantum dots (GQDs) have received enormous attention because of their unique chemical, electronic and optical properties. Here a series of GQDs were synthesized under hydrothermal processes in order to investigate the formation process and optical properties of N-doped GQDs. Citric acid (CA) was used as a carbon precursor and self-assembled into sheet structure in a ba...

2015
Guangmin Zhou Eunsu Paek Gyeong S. Hwang Arumugam Manthiram

Lithium-sulphur batteries with a high theoretical energy density are regarded as promising energy storage devices for electric vehicles and large-scale electricity storage. However, the low active material utilization, low sulphur loading and poor cycling stability restrict their practical applications. Herein, we present an effective strategy to obtain Li/polysulphide batteries with high-energ...

2014
Meng Du Jing Sun Jie Chang Fan Yang Liangjing Shi Lian Gao

A new route has been developed to synthesize nitrogen-doped reduced graphene oxide (N-RGO) with excellent lithium storage properties. Nitrogen-doped graphene oxide (N-GO) is firstly synthesized and then reduced to N-RGO. The nitrogen content of N-GO can reach up to 5.6 wt%. After hydrothermal treatment, the nitrogen content of N-RGO still remains at 2.0 wt%. Our N-RGO material reveals excellent...

Journal: :Nature nanotechnology 2010
Sukang Bae Hyeongkeun Kim Youngbin Lee Xiangfan Xu Jae-Sung Park Yi Zheng Jayakumar Balakrishnan Tian Lei Hye Ri Kim Young Il Song Young-Jin Kim Kwang S Kim Barbaros Ozyilmaz Jong-Hyun Ahn Byung Hee Hong Sumio Iijima

The outstanding electrical, mechanical and chemical properties of graphene make it attractive for applications in flexible electronics. However, efforts to make transparent conducting films from graphene have been hampered by the lack of efficient methods for the synthesis, transfer and doping of graphene at the scale and quality required for applications. Here, we report the roll-to-roll produ...

2017
Brandon Pollack Sunshine Holmberg Derosh George Ich Tran Marc Madou Maziar Ghazinejad

Catalytic substrate, which is devoid of expensive noble metals and enzymes for hydrogen peroxide (H₂O₂), reduction reactions can be obtained via nitrogen doping of graphite. Here, we report a facile fabrication method for obtaining such nitrogen doped graphitized carbon using polyacrylonitrile (PAN) mats and its use in H₂O₂ sensing. A high degree of graphitization was obtained with a mechanical...

2017
Xiaofen Xu Fuhua Gao Xiaohua Bai Fuchi Liu Wenjie Kong Ming Li

Nitrogen-doped graphene quantum dots (NGQDs) were synthesized by irradiating graphene quantum dots (GQDs) in an NH₃ atmosphere. The photoluminescence (PL) properties of the GQDs and the NGQDs samples were investigated. Compared with GQDs, a clear PL blue-shift of NGQDs could be achieved by regulating the irradiating time. The NGQDs obtained by irradiation of GQDs for 70 min had a high N content...

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