Iron and Nitrogen Co-doped CoSe2 Nanosheet Arrays for Robust Electrocatalytic Water Oxidation

2021 ◽  
Author(s):  
Di Li ◽  
Yingying Xing ◽  
Changjian Zhou ◽  
Yikai Lu ◽  
Shengjie Xu ◽  
...  
Keyword(s):  
Water Splitting ◽  
Water Oxidation ◽  
Energy Barrier ◽  
Large Scale ◽  
Scale Production ◽  
Reaction Energy ◽  
Large Scale Production ◽  
Nanosheet Arrays ◽  
Production Of Hydrogen ◽  
Co Doped

The high reaction energy barrier of the oxygen evolution reaction (OER) extremely reduces the efficiency of water splitting, which is not conducive to large-scale production of hydrogen. Due to the...

scholarly journals Stabilized Hydroxide-Mediated Nickel-Based Electrocatalysts for High-Current-Density Hydrogen Evolution in Alkaline Media

2021 ◽  
Author(s):  
Yuting Luo ◽  
Zhiyuan Zhang ◽  
Fengning Yang ◽  
Jiong Li ◽  
Zhibo Liu ◽  
...  
Keyword(s):  
Water Splitting ◽  
Large Scale ◽  
Fossil Fuels ◽  
High Current Density ◽  
Critical Energy ◽  
Alkaline Media ◽  
Scale Production ◽  
High Current ◽  
Large Scale Production ◽  
Electrochemical Water Splitting

Large-scale production of green hydrogen by electrochemical water splitting is considered as a promising technology to address critical energy challenges caused by the extensive use of fossil fuels. Although nonprecious...

scholarly journals Electrochemically derived functionalized graphene for bulk production of hydrogen peroxide

2020 ◽  
Vol 11 ◽  
pp. 432-442 ◽  
Author(s):  
Munaiah Yeddala ◽  
Pallavi Thakur ◽  
Anugraha A ◽  
Tharangattu N Narayanan
Keyword(s):  
Large Scale ◽  
Reduction Reaction ◽  
Single Step ◽  
Scale Production ◽  
Functionalized Graphene ◽  
Large Scale Production ◽  
Production Of Hydrogen ◽  
Electron Reduction ◽  
Bulk Production ◽  
Carbon Based

On-site peroxide generation via electrochemical reduction is gaining tremendous attention due to its importance in many fields, including water treatment technologies. Oxidized graphitic carbon-based materials have been recently proposed as an alternative to metal-based catalysts in the electrochemical oxygen reduction reaction (ORR), and in this work we unravel the role of C=O groups in graphene towards sustainable peroxide formation. We demonstrate a versatile single-step electrochemical exfoliation of graphite to graphene with a controllable degree of oxygen functionalities and thickness, leading to the formation of large quantities of functionalized graphene with tunable rate parameters, such as the rate constant and exchange current density. Higher oxygen-containing exfoliated graphene is known to undergo a two-electron reduction path in ORR having an efficiency of about 80 ± 2% even at high overpotential. Bulk production of H2O2 via electrolysis was also demonstrated at low potential (0.358 mV vs RHE), yielding ≈34 mg/L peroxide with highly functionalized (≈23 atom %) graphene and ≈16 g/L with low functionalized (≈13 atom %) graphene, which is on par with the peroxide production using state-of-the-art precious-metal-based catalysts. Hence this method opens a new scheme for the single-step large-scale production of functionalized carbon-based catalysts (yield ≈45% by weight) that have varying functionalities and can deliver peroxide via the electrochemical ORR process.

scholarly journals Polymer network-derived nitrogen/sulphur co-doped three-dimensionally interconnected hierarchically porous carbon for oxygen reduction, lithium-ion battery, and supercapacitor

RSC Advances ◽  
2019 ◽  
Vol 9 (63) ◽  
pp. 36570-36577 ◽  
Author(s):  
Zili Xu ◽  
Fangfang Zhang ◽  
Weiran Lin ◽  
Haining Zhang
Keyword(s):  
Porous Carbon ◽  
Large Scale ◽  
Polymer Network ◽  
Polymer Networks ◽  
Lithium Ion ◽  
Scale Production ◽  
Hierarchical Porous Carbon ◽  
Large Scale Production ◽  
Hierarchical Porous ◽  
Co Doped

Polymer networks are efficient precursors for large scale production of hierarchical porous carbon.

scholarly journals An Overview of the Photocatalytic Water Splitting over Suspended Particles

Catalysts ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 60
Author(s):  
Muhammad Amtiaz Nadeem ◽  
Mohd Adnan Khan ◽  
Ahmed Abdeslam Ziani ◽  
Hicham Idriss
Keyword(s):  
Water Splitting ◽  
Large Scale ◽  
Cost Effective ◽  
Synthetic Methods ◽  
Scale Production ◽  
Practical Applications ◽  
Co Catalysts ◽  
Large Scale Production ◽  
Cost Effective Method ◽  
Order Of Magnitude

The conversion of solar to chemical energy is one of the central processes considered in the emerging renewable energy economy. Hydrogen production from water splitting over particulate semiconductor catalysts has often been proposed as a simple and a cost-effective method for large-scale production. In this review, we summarize the basic concepts of the overall water splitting (in the absence of sacrificial agents) using particulate photocatalysts, with a focus on their synthetic methods and the role of the so-called “co-catalysts”. Then, a focus is then given on improving light absorption in which the Z-scheme concept and the overall system efficiency are discussed. A section on reactor design and cost of the overall technology is given, where the possibility of the different technologies to be deployed at a commercial scale and the considerable challenges ahead are discussed. To date, the highest reported efficiency of any of these systems is at least one order of magnitude lower than that deserving consideration for practical applications.

scholarly journals Universal Scaling Relations for the Rational Design of Molecular Water Oxidation Catalysts with Near- Zero Overpotential

2019 ◽  
Author(s):  
Michael Craig ◽  
Gabriel Coulter ◽  
eoin dolan ◽  
Joaquín Soriano-López ◽  
Wolfgang Schmitt ◽  
...  
Keyword(s):  
Water Splitting ◽  
Water Oxidation ◽  
Rational Design ◽  
Heterogeneous Systems ◽  
Molecular Water ◽  
Scaling Relations ◽  
Linear Scaling ◽  
Scale Production ◽  
Production Of Hydrogen ◽  
Molecular Catalysts

<div><div><div><p>A major roadblock in realizing the large-scale production of hydrogen via electrochemical water splitting is the lack of cost-effective and highly efficient catalysts for the oxygen evolution reaction (OER). In this regard, computational research has driven important developments in the understanding and the design of heterogeneous OER catalysts by establishing linear scaling relations. These relations are of paramount importance since they drastically reduce the amount of time required to traverse the vast chemical search space of potential OER materials. In this work, we interrogate 17 of the most active molecular OER catalysts known to date based on different transition metals (M= Ru, Mn, Fe, Co, Ni, and Cu), and show that they obey the linear scaling relations established for metal oxides. This demonstrates that the conventional OER descriptor established for heterogeneous systems can also be applied to rapidly screen novel molecular catalysts. However, we find that this descriptor underestimates the activity of some of the most active OER complexes as it does not consider the additional one-electron oxidation that these undergo prior to O–O bond formation. Importantly, we show that this additional step allows certain molecular catalysts to circumvent the “overpotential wall” observed for heterogeneous systems (i.e. 370 mV), leading to an enhanced performance in agreement with experimental observations. To describe the activity of such highly active catalysts, we propose a new OER descriptor that opens up the possibility of designing molecular catalysts exhibiting zero theoretical overpotential. With all this knowledge, we establish the fundamental principles for the rational design of ideal OER catalysts to advance the development of water splitting technologies.</p></div></div></div>

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