scholarly journals Synthesis of transition metal sulfide and reduced graphene oxide hybrids as efficient electrocatalysts for oxygen evolution reactions

2018 ◽  
Vol 5 (9) ◽  
pp. 180927 ◽  
Author(s):  
Yu-Rim Hong ◽  
Sungwook Mhin ◽  
Jiseok Kwon ◽  
Won-Sik Han ◽  
Taeseup Song ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Catalytic Activity ◽  
Transition Metal ◽  
Reduced Graphene Oxide ◽  
Oxygen Evolution ◽  
Chemical Interaction ◽  
High Surface ◽  
Metal Sulfide ◽  
Volume Ratio ◽  
Reduced Graphene

The development of electrochemical devices for renewable energy depends to a large extent on fundamental improvements in catalysts for oxygen evolution reactions (OERs). OER activity of transition metal sulfides (TMSs) can be improved by compositing with highly conductive supports possessing a high surface-to-volume ratio, such as reduced graphene oxide (rGO). Herein we report on the relationship between synthetic conditions and the OER catalytic properties of TMSs and rGO (TMS–rGO) hybrids. Starting materials, reaction temperature and reaction time were controlled to synergistically boost the OER catalytic activity of TMS–rGO hybrids. Our results showed that (i) compared with sulfides, hydroxides are favourable as starting materials to produce the desired TMS–rGO hybrid nanostructure and (ii) high reaction temperatures and longer reaction times can increase physico-chemical interaction between TMSs and rGO supports, resulting in highly efficient OER catalytic activity.

Structural, Electronic and Electrocatalytic Evaluation of Spinel Transition Metal Sulfide Supported Reduced Graphene Oxide

2022 ◽  
Author(s):  
Santhosh Kumar Ramasamy ◽  
Ramakrishnan S ◽  
Sampath Prabhakaran ◽  
Ae Kim ◽  
Ranjith Kumar Dharman ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Hydrogen Production ◽  
Transition Metal ◽  
Reduced Graphene Oxide ◽  
Metal Sulfide ◽  
Water Electrolysis ◽  
Vital Role ◽  
Transition Metal Sulfide ◽  
Highly Active ◽  
Reduced Graphene

Development of highly active and durable non-precious spinel transition metal sulfide (STMS)-based electrocatalysts plays a vital role in increasing the efficiency of hydrogen production via water electrolysis. Herein, we have...

Mesoporous titanosilicate/reduced graphene oxide composites: layered structure, high surface-to-volume ratio, doping effect and application in dye removal from water

2012 ◽  
Vol 22 (38) ◽  
pp. 20504 ◽  
Author(s):  
Thuy-Duong Nguyen-Phan ◽  
Eun Woo Shin ◽  
Viet Hung Pham ◽  
Hyukmin Kweon ◽  
Sunwook Kim ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Layered Structure ◽  
Dye Removal ◽  
High Surface ◽  
Volume Ratio ◽  
Doping Effect ◽  
Reduced Graphene ◽  
Oxide Composites

Enhanced Bifunctional Catalytic Activity of Cobalt Phosphide Flowers Anchored N‐Doped Reduced Graphene Oxide for Hydrogen and Oxygen Evolution

2020 ◽  
Vol 7 (15) ◽  
pp. 3319-3323
Author(s):  
Thazhe Veettil Vineesh ◽  
Usha Vijayakumar Anagha ◽  
Naduvile Purayil Dileep ◽  
Haritha Cheraparambil ◽  
Jyothish Nambeesan ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Catalytic Activity ◽  
Reduced Graphene Oxide ◽  
Oxygen Evolution ◽  
Cobalt Phosphide ◽  
Reduced Graphene

scholarly journals Electrochemical impacts of sheet-like hafnium phosphide and hafnium disulfide catalysts bonded with reduced graphene oxide sheets for bifunctional oxygen reactions in alkaline electrolytes

RSC Advances ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 2599-2607 ◽  
Author(s):  
Mayilvel Dinesh Meganathan ◽  
Taizhong Huang ◽  
Hengyi Fang ◽  
Jianfeng Mao ◽  
Guoxin Sun
Keyword(s):  
Graphene Oxide ◽  
Catalytic Activity ◽  
Oxygen Reduction ◽  
Reduced Graphene Oxide ◽  
Oxygen Evolution ◽  
High Catalytic Activity ◽  
Oxygen Reduction Reactions ◽  
Reduced Graphene ◽  
Alkaline Electrolytes ◽  
Graphene Oxide Sheets

Sheet-like structured hafnium phosphide (HfP) and hafnium disulphide (HfS2) catalysts show high catalytic activity for both oxygen evolution and oxygen reduction reactions, which are determined by the compositional anion ions.

scholarly journals Improving the ammonia sensing of reduced graphene oxide film by using metal nano-materials

2015 ◽  
Vol 18 (3) ◽  
pp. 72-77
Author(s):  
Hoa Tran My Huynh ◽  
Thu Thi Hoang ◽  
Thanh Thi Phuong Nguyen ◽  
Tham Ngoc Nguyen ◽  
Nhung Thi Tuyet Bui ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Gas Adsorption ◽  
Gas Sensing ◽  
High Surface ◽  
Volume Ratio ◽  
Nano Materials ◽  
Gas Sensitivity ◽  
Ammonia Sensing ◽  
Reduced Graphene

Gas sensing is one of the most promising applications for reduced graphene oxide (rGO). High surface-to-volume ratio in conjunction with remaining reactive oxygen functional groups translates into sensitivity to molecular on the rGO surface. The response of the rGO based devices can be further improved by functionalizing its surface with metal nano-materials. In this paper, we report the ammonia (NH3) sensing behavior of rGO based sensors functionalized with nano-structured metal: silver (Ag) or platinum (Pt) or gold (Au) in air at room temperature and atmospheric pressure. The gas response is detected by the monitoring changes in electrical resistance of the rGO/metal hybrids due to NH3 gas adsorption. Compared to bare rGO, significantly improved NH3 sensitivity is observed with the addition of nano-structured metals. These materials are applied to play the small bridges role connecting many graphene islands together to improve electrical conduction of hybrids while maintaining the inherent advantage of rGO for NH3 gas sensitivity.

3D Porous Nb2C MXene/Reduced Graphene Oxide Aerogel Coupled with NiFe Alloy Nanoparticles for Wearable Zn–Air Batteries

2021 ◽  
Author(s):  
Hang Lei ◽  
Shangjing Yang ◽  
Runquan Lei ◽  
Qing Zhong ◽  
Qixiang Wan ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Catalytic Activity ◽  
Reduced Graphene Oxide ◽  
Active Sites ◽  
Alloy Nanoparticles ◽  
Reduced Graphene ◽  
Reduced Graphene Oxide Aerogel ◽  
Graphene Oxide Aerogel ◽  
Catalytic Processes

Insufficient catalytic activity and self-restacking of 2D MXenes during catalytic processes would lead to limited number of active sites, sluggish ionic kinetics and poor durability, extremely restricting its application in...

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