Magnetic Multifunctional Nanostructures as High-efficiency Catalysts for Oxygen Evolution Reactions

MRS Advances ◽  
2016 ◽  
Vol 1 (34) ◽  
pp. 2401-2407 ◽  
Author(s):  
Umanga De Silva ◽  
W. P. R. Liyanage ◽  
Manashi Nath
Keyword(s):  
Oxygen Evolution ◽  
Water Oxidation ◽  
High Efficiency ◽  
Clean Energy ◽  
Elemental Selenium ◽  
Ferromagnetic Behavior ◽  
High Electron ◽  
Metallic Component ◽  
Onset Potential ◽  
Multifunctional Nanostructures

AbstractThe search for high-efficiency and environmentally benign water splitting catalysts has been on the rise since this process is a source of renewable, clean energy. However the process is inherently slow, especially for the production of O2 from H2O (water oxidation) due to the high electron count and energy intensive bond formation of the reaction. Hence the search for novel catalysts for oxygen evolution reactions (OER) has led researchers to focus on various families of compounds including oxides and recently selenides. Multifunctional nanostructures containing the semiconductor electrocatalyst grafted onto an optically active metallic component might boost the catalytic activity even further due to efficient charge injection. Magnetically active catalysts will also be lucrative since that might induce better adhesion of the oxygenated species at the catalytically active site. In this report we introduce multifunctional, magnetic Au3Pd–CoSe nanostructures as high-efficiency OER electrocatalysts. These multifunctional nanostructures were synthesized by a chemical vapor deposition (CVD) reaction with cobalt acetylacetonate and elemental selenium on Au-Pd sputter coated silica substrate at 800°C. The morphology of these multifunctional nanostructures were mostly bifunctional Janus-like nanoparticles as seen through scanning and transmission electron microscopy. They also showed soft ferromagnetic behavior. These bifunctional nanoparticles were coated on the anodes of a water oxidation cell and it was observed that these nanoparticles showed a higher OER activity with lower onset potential for O2 evolution as compared to the conventional oxide-based OER electrocatalysts.

scholarly journals Aromaticity Driven Electrocatalytic Water Oxidation by a Phosphorus-Nitrogen PN3-Pincer Cobalt Complex

2019 ◽  
Author(s):  
Pradip K. Das ◽  
Sarmistha Bhunia ◽  
Priyanka Chakraborty ◽  
Atanu Rana ◽  
Abhishek Dey ◽  
...  
Keyword(s):  
Water Oxidation ◽  
High Efficiency ◽  
Cobalt Complex ◽  
Potential Jump ◽  
Onset Potential ◽  
New Strategy ◽  
Earth Abundant ◽  
High Valent ◽  
Lower Overpotential ◽  
Cobalt Species

Water oxidation is the primary step in both natural and artificial photosynthesis to convert solar energy in into chemical fuels. Herein, we report the first cobalt-based pincer catalyst for electrolytic water oxidation at neutral pH with high efficiency under electrochemical conditions. Most importantly, ligand (pseudo)aromaticity is identified to play an important role in the electrocatalysis. A significant potential jump (~300 mV) was achieved towards a lower positive value when the aromatized cobalt complex was transformed to a (pseudo)dearomatized cobalt species. This complex catalyzes the water oxidation in its high valent oxidation state at a much lower overpotential (~ 340 mV vs. NHE) based on the onset potential (0.5 mA/cm<sup>2</sup>) of catalysis at pH 10.5, outperforming all the other literature systems. These observations may provide a new strategy for the design of earth-abundant transition metal-based water oxidation catalysts.

Nickel selenide as a high-efficiency catalyst for oxygen evolution reaction

2016 ◽  
Vol 9 (5) ◽  
pp. 1771-1782 ◽  
Author(s):  
A. T. Swesi ◽  
J. Masud ◽  
M. Nath
Keyword(s):  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
High Efficiency ◽  
Onset Potential ◽  
Alkaline Conditions

Ni3Se2 has been identified as a high-efficiency oxygen evolution catalyst with low onset potential and extended stability under alkaline conditions.

scholarly journals Surface Modification of Hematite Photoanodes for Improvement of Photoelectrochemical Performance

Catalysts ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 497 ◽  
Author(s):  
Lifei Xi ◽  
Kathrin Lange
Keyword(s):  
Surface Modification ◽  
Water Splitting ◽  
Oxygen Evolution ◽  
Water Oxidation ◽  
Oxidation Kinetics ◽  
Surface Passivation ◽  
Earth Metal ◽  
Photoelectrochemical Performance ◽  
Onset Potential ◽  
Solar Water Splitting

Solar water splitting is a promising method for producing renewable fuels. Thermodynamically, the overall water splitting reaction is an uphill reaction involving a multiple electron transfer process. The oxygen evolution reaction (OER) has been identified as the bottleneck process. Hematite (α-Fe2O3) is one of the best photoanode material candidates due to its band gap properties and stability in aqueous solution. However, the reported efficiencies of hematite are notoriously lower than the theoretically predicted value mainly due to poor charge transfer and separation ability, short hole diffusion length as well as slow water oxidation kinetics. In this Review Article, several emerging surface modification strategies to reduce the oxygen evolution overpotential and thus to enhance the water oxidation reaction kinetics will be presented. These strategies include co-catalysts loading, photoabsorption enhancing (surface plasmonic metal and rare earth metal decoration), surface passivation layer deposition, surface chemical etching and surface doping. These methods are found to reduce charge recombination happening at surface trapping states, promote charge separation and diffusion, and accelerate water oxidation kinetics. The detailed surface modification methods, surface layer materials, the photoelectrochemical (PEC) performances including photocurrent and onset potential shift as well as the related proposed mechanisms will be reviewed.

scholarly journals Facile Synthesis of IrCu Microspheres Based on Polyol Method and Study on Their Electro-Catalytic Performances to Oxygen Evolution Reaction

Nanomaterials ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 1145 ◽  
Author(s):  
Xuan Liu ◽  
Zichao Li ◽  
Luming Zhou ◽  
Kuankuan Wang ◽  
Xihui Zhao ◽  
...  
Keyword(s):  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
High Efficiency ◽  
Synthesis Method ◽  
Clean Energy ◽  
Polyol Method ◽  
One Pot ◽  
Acidic Conditions ◽  
Shape Controlled ◽  
Catalytic Performances

The development of Ir-based catalyst with high efficiency for oxygen evolution reaction (OER) in acidic conditions is of great significance to the development of clean energy, but it still remains a significant challenge for shape controlled synthesis of Ir-based catalysts. This article presented a facile one-pot synthesis method that is based on polyol method for preparing IrCu microspheres. In the process of synthesis, formaldehyde solution and ethylene glycol were used as reducing agent and solvent, respectively, while poly(vinylpyrrolidone) was used as surfactant and dispersant, and all of them played important roles in the successful synthesis of Ir-Cu microspheres. The Ir-Cu microspheres, as synthesized, showed well sphere shape and smooth surface, while their alloy features were quite clear and the composition could be adjusted. Benefitting from the synergistic electronic effect between the Iridium and Cupric atoms from the alloy, the IrCu0.77 microspheres exhibited excellent electrocatalytic activity towards OER in 0.1 M HClO4 electrolyte, and to achieve 10 mA cm−2, IrCu0.77 microspheres only required the overpotential of 282 mV, which was much lower than that of commercial Ir/C catalysts.

Hydrogenated hematite nanostructures for high-efficiency solar water oxidation

RSC Advances ◽  
2016 ◽  
Vol 6 (95) ◽  
pp. 92206-92212 ◽  
Author(s):  
Litao Zhou ◽  
Xiaolin Lv ◽  
Yuting Nie ◽  
Jiujun Deng ◽  
Hui Zhang ◽  
...  
Keyword(s):  
Water Oxidation ◽  
Oxygen Vacancies ◽  
High Efficiency ◽  
Onset Potential ◽  
Solar Water ◽  
Solar Water Oxidation

Hematite with oxygen vacancies can lower the onset potential and achieve a high photocurrent of 2.00 mA cm−2 at 1.0 VRHE.

scholarly journals Hollow CoP/FeP4 Heterostructural Nanorods Interwoven by CNT as a Highly Efficient Electrocatalyst for Oxygen Evolution Reactions

Nanomaterials ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 1450
Author(s):  
Yanfang Liu ◽  
Yong Li ◽  
Qi Wu ◽  
Zhe Su ◽  
Bin Wang ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Oxygen Evolution ◽  
Water Oxidation ◽  
Active Sites ◽  
High Performance ◽  
Hydrothermal Reaction ◽  
Clean Energy ◽  
Electrochemical Performances ◽  
Ion Diffusion ◽  
Kinetics Of

Electrolysis of water to produce hydrogen is crucial for developing sustainable clean energy and protecting the environment. However, because of the multi-electron transfer in the oxygen evolution reaction (OER) process, the kinetics of the reaction is seriously hindered. To address this issue, we designed and synthesized hollow CoP/FeP4 heterostructural nanorods interwoven by carbon nanotubes (CoP/FeP4@CNT) via a hydrothermal reaction and a phosphorization process. The CoP/FeP4@CNT hybrid catalyst delivers prominent OER electrochemical performances: it displays a substantially smaller Tafel slope of 48.0 mV dec−1 and a lower overpotential of 301 mV at 10 mA cm−2, compared with an RuO2 commercial catalyst; it also shows good stability over 20 h. The outstanding OER property is mainly attributed to the synergistic coupling between its unique CNT-interwoven hollow nanorod structure and the CoP/FeP4 heterojunction, which can not only guarantee high conductivity and rich active sites, but also greatly facilitate the electron transfer, ion diffusion, and O2 gas release and significantly enhance its electrocatalytic activity. This work offers a facile method to develop transition metal-based phosphide heterostructure electrocatalysts with a unique hierarchical nanostructure for high performance water oxidation.

scholarly journals The rise of hematite: origin and strategies to reduce the high onset potential for the oxygen evolution reaction

2015 ◽  
Vol 3 (33) ◽  
pp. 16896-16912 ◽  
Author(s):  
Beniamino Iandolo ◽  
Björn Wickman ◽  
Igor Zorić ◽  
Anders Hellman
Keyword(s):  
Water Splitting ◽  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Water Oxidation ◽  
Large Scale ◽  
Electrochemical Potential ◽  
Onset Potential

The prospect of large scale light-driven water splitting on hematite (Fe2O3) is currently hampered by the high electrochemical potential required to initiate the water oxidation.

Elemental selenium enables enhanced water oxidation electrocatalysis of NiFe layered double hydroxides

Nanoscale ◽  
2019 ◽  
Vol 11 (37) ◽  
pp. 17376-17383 ◽  
Author(s):  
Shuo Duan ◽  
Shaoqing Chen ◽  
Tanyuan Wang ◽  
Shenzhou Li ◽  
Jianyun Liu ◽  
...  
Keyword(s):  
Oxygen Evolution ◽  
Layered Double Hydroxides ◽  
Oxygen Evolution Reaction ◽  
Water Oxidation ◽  
Monoclinic Phase ◽  
Electronic States ◽  
Catalytic Performance ◽  
Elemental Selenium ◽  
Double Hydroxides

Elemental Se with monoclinic phase tunes the electronic states of metallic sites for NiFe-layered double hydroxides and promotes the generation of γ-NiOOH, leading to enhanced catalytic performance for oxygen evolution reaction.

Synergetic recycling and conversion of spent Li-ion battery leachates into high-efficiency oxygen evolution catalysts

2021 ◽  
Author(s):  
Hong Chen ◽  
Zhijie Chen ◽  
Wensong Zou ◽  
Renji Zheng ◽  
Wenfei Wei ◽  
...  
Keyword(s):  
Energy Conversion ◽  
Oxygen Evolution ◽  
High Efficiency ◽  
Clean Energy ◽  
Li Ion Batteries ◽  
Li Ion Battery ◽  
Efficient Energy ◽  
Highly Efficient ◽  
Li Ion

Converting spent Li-ion batteries (LIBs) into highly efficient energy conversion catalysts in a facile manner is a win-win strategy in addressing the metal resources shortage and clean energy problems. Herein,...

scholarly journals Aromaticity Driven Electrocatalytic Water Oxidation by a Phosphorus-Nitrogen PN3-Pincer Cobalt Complex

2019 ◽  
Author(s):  
Pradip K. Das ◽  
Sarmistha Bhunia ◽  
Priyanka Chakraborty ◽  
Atanu Rana ◽  
Abhishek Dey ◽  
...  
Keyword(s):  
Water Oxidation ◽  
High Efficiency ◽  
Cobalt Complex ◽  
Potential Jump ◽  
Onset Potential ◽  
New Strategy ◽  
Earth Abundant ◽  
High Valent ◽  
Lower Overpotential ◽  
Cobalt Species

Water oxidation is the primary step in both natural and artificial photosynthesis to convert solar energy in into chemical fuels. Herein, we report the first cobalt-based pincer catalyst for electrolytic water oxidation at neutral pH with high efficiency under electrochemical conditions. Most importantly, ligand (pseudo)aromaticity is identified to play an important role in the electrocatalysis. A significant potential jump (~300 mV) was achieved towards a lower positive value when the aromatized cobalt complex was transformed to a (pseudo)dearomatized cobalt species. This complex catalyzes the water oxidation in its high valent oxidation state at a much lower overpotential (~ 340 mV vs. NHE) based on the onset potential (0.5 mA/cm<sup>2</sup>) of catalysis at pH 10.5, outperforming all the other literature systems. These observations may provide a new strategy for the design of earth-abundant transition metal-based water oxidation catalysts.

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