Roles of Graphene Oxide in Hydrothermal Carbonization and Microwave Irradiation of Distiller’s Dried Grains with Solubles To Produce Supercapacitor Electrodes

2017 ◽  
Vol 5 (6) ◽  
pp. 5588-5597 ◽  
Author(s):  
Yong Wang ◽  
Long Jiang
Keyword(s):  
Graphene Oxide ◽  
Microwave Irradiation ◽  
Hydrothermal Carbonization

Synthesis and Study of Reduced Graphene Oxide layers under Microwave Irradiation

2018 ◽  
Vol 5 (2) ◽  
pp. 3403-3410 ◽  
Author(s):  
D. Sreedhar ◽  
Sandhya Devireddy ◽  
Vasudeva Rao Veeredhi
Keyword(s):  
Graphene Oxide ◽  
Microwave Irradiation ◽  
Reduced Graphene Oxide ◽  
Oxide Layers ◽  
Reduced Graphene

Rapid Nucleation of Reduced Graphene Oxide-Supported Palladium Electrocatalysts for Methanol Oxidation Reaction

2019 ◽  
Vol 19 (11) ◽  
pp. 7236-7243
Author(s):  
Jen Chao Ng ◽  
Chou Yong Tan ◽  
Boon Hoong Ong ◽  
Atsunori Matsuda ◽  
Wan Jefrey Basirun ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Microwave Irradiation ◽  
Reduced Graphene Oxide ◽  
Oxidation Reaction ◽  
Room Temperature ◽  
Methanol Oxidation Reaction ◽  
Ph Adjustment ◽  
Reduced Graphene ◽  
High Supersaturation ◽  
Supported Palladium

Small sized electrocatalysts, which can be obtained by rapid nucleation and high supersaturation are imperative for outstanding methanol oxidation reaction (MOR). Conventional microwave synthesis processes of electrocatalysts include ultrasonication, stirring, pH adjustment, and microwave irradiation of the precursor mixture. Ethylene glycol (EG), which serves as a reductant and solvent was added during the ultrasonication or stirring stage. However, this step and pH adjustment resulted in unintended multi-stage gradual nucleation. In this study, the microwave reduction approach was used to induce rapid nucleation and high supersaturation in order to fabricate small-sized reduced graphene oxide-supported palladium (Pd/rGO) electrocatalysts via the delayed addition of EG, elimination of the pH adjustment step, addition of sodium carbonate (Na2CO3), prior microwave irradiation of the EG mixed with Na2CO3, and addition of room temperature precursor mixture. Besides its role as a second reducing agent, the addition of Na2CO3 was primarily intended to generate an alkaline condition, which is essential for the high-performance of electrocatalysts. Moreover, the microwave irradiation of the EG and Na2CO3 mixture generated highly reactive free radicals that facilitate rapid nucleation. Meanwhile, the room temperature precursor mixture increased supersaturation. Results showed improved electrochemically active surface area (78.97 m2 g−1, 23.79% larger), MOR (434.49 mA mg−1, 37.96% higher) and stability.

Arc spectra of different solid reduced graphene oxide samples under microwave irradiation

2020 ◽  
Vol 109 ◽  
pp. 108060
Author(s):  
Wenshuai Jiang ◽  
Zhenxin Li ◽  
Yongtao Zhu ◽  
Wei Xin ◽  
Yi Yu
Keyword(s):  
Graphene Oxide ◽  
Microwave Irradiation ◽  
Reduced Graphene Oxide ◽  
Reduced Graphene

Graphene oxide-catalysed oxidation reaction of unsaturated compounds under microwave irradiation

2015 ◽  
Vol 72 ◽  
pp. 133-137 ◽  
Author(s):  
Jose M. Bermudez ◽  
J. Angel Menendez ◽  
Ana Arenillas ◽  
Rafael Martínez-Palou ◽  
Antonio A. Romero ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Microwave Irradiation ◽  
Oxidation Reaction ◽  
Unsaturated Compounds ◽  
Catalysed Oxidation

Graphene Oxide Assisted Hydrothermal Carbonization of Carbon Hydrates

ACS Nano ◽  
2013 ◽  
Vol 8 (1) ◽  
pp. 449-457 ◽  
Author(s):  
Deepti Krishnan ◽  
Kalyan Raidongia ◽  
Jiaojing Shao ◽  
Jiaxing Huang
Keyword(s):  
Graphene Oxide ◽  
Hydrothermal Carbonization ◽  
Carbon Hydrates

Microwave-assisted synthesis of multiply-twinned Au–Ag nanocrystals on reduced graphene oxide for high catalytic performance towards hydrogen evolution reaction

2016 ◽  
Vol 4 (10) ◽  
pp. 3865-3871 ◽  
Author(s):  
Yuchen Qin ◽  
Xiaoping Dai ◽  
Xin Zhang ◽  
Xingliang Huang ◽  
Hui Sun ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Microwave Irradiation ◽  
Reduced Graphene Oxide ◽  
Hydrogen Evolution Reaction ◽  
Catalytic Performance ◽  
Microwave Assisted Synthesis ◽  
One Pot ◽  
Microwave Assisted ◽  
Reduced Graphene ◽  
Ag Ncs

Multiply-twinned Au–Ag NCs/rGO are prepared by a one-pot method under microwave irradiation and exhibit excellent HER activity and stability.

scholarly journals Sintesis Graphene Melalui Iradiasi Microwave Sebagai Sensor Metanol

2020 ◽  
Vol 5 (1) ◽  
pp. 40
Author(s):  
Endah Fitriani Rahayu ◽  
Alfi Nurul Amalia
Keyword(s):  
Graphene Oxide ◽  
Microwave Irradiation ◽  
Gas Target

Graphene merupakan material 2 dimensional yang mempunyai sifat unik salah satunya memiliki luas permukaan sangat tinggi (~2630 m2g-1) yang dapat mengadsorbsi gas target. Tidak seperti sensor gas lainnya, sensor graphene dapat dioperasikan di bawah kondisi sekitar dan pada suhu kamar. Interaksi antar gas metanol dengan graphene menghasilkan perubahan pada sifak konduktifitas dan resistensinya yang membuat graphene menjadi elemen sensor yang baik. Struktur dan sifat elektronik graphene tergantung pada proses sintesisnya. Metode Hummers dan microwave irradiation dipilih karena biaya produksi efektif, menghasilkan graphene dengan sensitifitas tinggi terhadap target gas. Dari ketiga variasi pembuatan graphene dari Graphene Oxide (GO) melalui microwave irradiation yaitu 0,1 g-450 Watt, 0,1 g-630 Watt dan 0,02 g-450 Watt menunjukkan sensitifitas paling tinggi pada variasi graphene 0,02 g-450 Watt. Hal ini mengindikasikan semakin kecil massa GO  dan semakin tinggi daya microwave membentuk sifat graphene yang lebih optimal terlebih untuk sensor gas.

scholarly journals Microwave induced electric discharges on metal particles for the synthesis of zero-, one- and two-dimensional inorganic nanomaterials under solvent-free conditions

2020 ◽  
Author(s):  
Vijay Tripathi ◽  
Harit Kumar ◽  
Anubhav Agarwal ◽  
Leela Srinivas Panchakarla
Keyword(s):  
Graphene Oxide ◽  
Microwave Irradiation ◽  
Metal Particles ◽  
Electric Discharges ◽  
Two Dimensional ◽  
Metallic Nanoparticle ◽  
One Dimensional ◽  
Solvent Free Conditions ◽  
Reduced Graphene ◽  
Inorganic Nanomaterials

Microwave irradiation of metals generates electric discharges (sparks). These sparks are used to generate metallic nanoparticle of Cu and Ni and one-dimensional nanorods of CuS, ZnF2, and NiF2 protected with fluorinated amorphous carbon. We have also synthesized reduced graphene oxide and graphene partially rolled into scrolls by this method.

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