scholarly journals Facile Mechanochemical Synthesis of Nickel/Graphene Oxide Nanocomposites with Unique and Tunable Morphology: Applications in Heterogeneous Catalysis and Supercapacitors

Catalysts ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 486 ◽  
Author(s):  
Mayakrishnan Gopiraman ◽  
Somasundaram Saravanamoorthy ◽  
Dian Deng ◽  
Andivelu Ilangovan ◽  
Ick Soo Kim ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Catalytic Activity ◽  
Specific Capacitance ◽  
Preparation Method ◽  
High Rate ◽  
Ni Nanoparticles ◽  
Graphene Nanocomposites ◽  
Factual Content ◽  
Tunable Morphology ◽  
Defective Sites

In this study, a very simple and highly effective mechanochemical preparation method was developed for the preparation of Ni nanoparticles supported graphene oxide (GO) nanocomposites (Ni/GO, where Ni is a composition of Ni(OH)2, NiOOH, NiO, Ni2O3 and NiO2), 3 wt% NiO/GO (Ni/GO-1) and 8 wt% NiO/GO(Ni/GO-2). The developed method is not only very simple and efficient, but also, the morphology of Ni/GO nanocomposites can be tuned by simply varying the metal loading. Morphology and specific surface area of the resultant Ni/GO nanocomposites were investigated by mean of AFM, HR-TEM and BET. Chemical sate and factual content of Ni in Ni/GO-1 and Ni/GO-2, and the presence of defective sites in Ni-nanocomposites were investigated in detail. To our delight, the prepared Ni/GO-2 demonstrated superior catalytic activity toward the reduction of 2- and 4-nitrophenol in water with high rate constant (kapp) of 35.4 × 10−3 s−1. To the best of our knowledge, this is the best efficient Ni-based graphene nanocomposites for the reduction of 2- and 4-NP reported to date. The Ni/GO-1 and Ni/GO-2 demonstrated an excellent reusability; no loss in its catalytic activity was noticed, even after 10th cycle. Surprisingly the Ni/GO-2 as electrode material exhibited an excellent specific capacitance of 461 F/g in 6 M KOH at a scan rate of 5 mV. Moreover, the Ni/GO nanocomposites were found to possess poor electrical resistance and high stability (no significant change in the specific capacitance even after 1000 cycles).

MOF-derived uniform Ni nanoparticles encapsulated in carbon nanotubes grafted on rGO nanosheets as bifunctional materials for lithium-ion batteries and hydrogen evolution reaction

Nanoscale ◽  
2019 ◽  
Vol 11 (32) ◽  
pp. 15112-15119 ◽  
Author(s):  
Yingying Cao ◽  
Yidong Lu ◽  
Edison Huixiang Ang ◽  
Hongbo Geng ◽  
Xueqin Cao ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Graphene Oxide ◽  
Catalytic Activity ◽  
Lithium Ion Batteries ◽  
Lithium Ion ◽  
Ni Nanoparticles ◽  
Lithium Storage ◽  
Storage Performance ◽  
Reduced Graphene ◽  
Controllable Process

N-Doped CNT-encapsulated Ni nanoparticles on reduced graphene oxide (Ni@NC-rGO) were fabricated by a controllable process, which could deliver superior lithium storage performance and outstanding catalytic activity for HER.

Facile sonochemical synthesis and electrochemical investigation of ceria/graphene nanocomposites

2015 ◽  
Vol 3 (11) ◽  
pp. 2362-2370 ◽  
Author(s):  
Amin Shiralizadeh Dezfuli ◽  
Mohammad Reza Ganjali ◽  
Parviz Norouzi ◽  
Farnoush Faridbod
Keyword(s):  
Graphene Oxide ◽  
Catalytic Activity ◽  
Synergistic Effect ◽  
Self Assembly ◽  
Sonochemical Method ◽  
Electrochemical Investigation ◽  
Sonochemical Synthesis ◽  
Graphene Nanocomposites ◽  
Reduced Graphene ◽  
Electro Catalytic Activity

We have developed a self-assembly approach to anchor CeO2 nanoparticles onto reduced graphene oxide (RGO) through a sonochemical method. We found that a suitable loading content of CeO2 on RGO can induce a synergistic effect for optimizing the electro-catalytic activity of the nanocomposites.

NiAg-graphene quantum dot-graphene hybrid with high oxidase-like catalytic activity for sensitive colorimetric detection of malathion

2021 ◽  
Author(s):  
Xu Dan ◽  
Ruiyi Li ◽  
Qinsheng Wang ◽  
Yongqiang Yang ◽  
Haiyan Zhu ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Graphene Oxide ◽  
Catalytic Activity ◽  
Quantum Dot ◽  
Colorimetric Detection ◽  
Graphene Quantum Dots ◽  
Functionalized Graphene ◽  
Graphene Quantum Dot ◽  
Nickel Silver

The paper reports the synthesis of nickel-silver-graphene quantum dot-graphene hybrid. Histidine-functionalized graphene quantum dots (His-GQDs) were bonded to graphene oxide (GO) and then combined with Ni2+ and Ag+ to form...

Covalent Modified Reduced Graphene Oxide: Facile Fabrication and High Rate Supercapacitor Performances

2020 ◽  
pp. 137700
Author(s):  
Qing Wang ◽  
Haiyan Gao ◽  
Chenzhuo Zhao ◽  
HuiXin Yue ◽  
Guowei Gao ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
High Rate ◽  
Reduced Graphene ◽  
Facile Fabrication

scholarly journals Tuning the hierarchical pore structure of graphene oxide through dual thermal activation for high-performance supercapacitor

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Jeongpil Kim ◽  
Jeong-Hyun Eum ◽  
Junhyeok Kang ◽  
Ohchan Kwon ◽  
Hansung Kim ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Pore Structure ◽  
Specific Capacitance ◽  
Surface Area ◽  
Thermal Annealing ◽  
High Performance ◽  
Annealing Process ◽  
Supercapacitor Electrode ◽  
Simple Method ◽  
Surface Areas

AbstractHerein, we introduce a simple method to prepare hierarchical graphene with a tunable pore structure by activating graphene oxide (GO) with a two-step thermal annealing process. First, GO was treated at 600 °C by rapid thermal annealing in air, followed by subsequent thermal annealing in N2. The prepared graphene powder comprised abundant slit nanopores and micropores, showing a large specific surface area of 653.2 m2/g with a microporous surface area of 367.2 m2/g under optimized conditions. The pore structure was easily tunable by controlling the oxidation degree of GO and by the second annealing process. When the graphene powder was used as the supercapacitor electrode, a specific capacitance of 372.1 F/g was achieved at 0.5 A/g in 1 M H2SO4 electrolyte, which is a significantly enhanced value compared to that obtained using activated carbon and commercial reduced GO. The performance of the supercapacitor was highly stable, showing 103.8% retention of specific capacitance after 10,000 cycles at 10 A/g. The influence of pore structure on the supercapacitor performance was systematically investigated by varying the ratio of micro- and external surface areas of graphene.

scholarly journals Oxygen-Deficient β-MnO2@Graphene Oxide Cathode for High-Rate and Long-Life Aqueous Zinc Ion Batteries

2021 ◽  
Vol 13 (1) ◽  
Author(s):  
Shouxiang Ding ◽  
Mingzheng Zhang ◽  
Runzhi Qin ◽  
Jianjun Fang ◽  
Hengyu Ren ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Manganese Oxides ◽  
Rate Capability ◽  
High Energy ◽  
Zinc Ion ◽  
Cycling Stability ◽  
High Rate ◽  
High Energy Density ◽  
Superior Performance ◽  
Long Life

AbstractRecent years have witnessed a booming interest in grid-scale electrochemical energy storage, where much attention has been paid to the aqueous zinc ion batteries (AZIBs). Among various cathode materials for AZIBs, manganese oxides have risen to prominence due to their high energy density and low cost. However, sluggish reaction kinetics and poor cycling stability dictate against their practical application. Herein, we demonstrate the combined use of defect engineering and interfacial optimization that can simultaneously promote rate capability and cycling stability of MnO2 cathodes. β-MnO2 with abundant oxygen vacancies (VO) and graphene oxide (GO) wrapping is synthesized, in which VO in the bulk accelerate the charge/discharge kinetics while GO on the surfaces inhibits the Mn dissolution. This electrode shows a sustained reversible capacity of ~ 129.6 mAh g−1 even after 2000 cycles at a current rate of 4C, outperforming the state-of-the-art MnO2-based cathodes. The superior performance can be rationalized by the direct interaction between surface VO and the GO coating layer, as well as the regulation of structural evolution of β-MnO2 during cycling. The combinatorial design scheme in this work offers a practical pathway for obtaining high-rate and long-life cathodes for AZIBs.

scholarly journals Magnetization of graphene oxide nanosheets using nickel magnetic nanoparticles as a novel support for the fabrication of copper as a practical, selective, and reusable nanocatalyst in C–C and C–O coupling reactions

RSC Advances ◽  
2021 ◽  
Vol 11 (42) ◽  
pp. 25867-25879
Author(s):  
Parisa Moradi ◽  
Maryam Hajjami
Keyword(s):  
Graphene Oxide ◽  
Catalytic Activity ◽  
Magnetic Nanoparticles ◽  
Coupling Reactions ◽  
Graphene Oxide Nanosheets ◽  
Magnetic Graphene Oxide ◽  
Diaryl Ethers ◽  
Magnetic Graphene

Catalytic activity of supported copper on magnetic graphene oxide was investigated as a selective and reusable nanocatalyst in the synthesis of diaryl ethers and biphenyls.

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