scholarly journals Improving the onset potential and Tafel slope determination of earth-abundant water oxidation electrocatalysts

2021 ◽  
pp. 138613
Author(s):  
Roger Sanchis-Gual ◽  
Alvaro Seijas-Da Silva ◽  
Marc Coronado-Puchau ◽  
Toribio F. Otero ◽  
Gonzalo Abellán ◽  
...  
Keyword(s):  
Water Oxidation ◽  
Tafel Slope ◽  
Onset Potential ◽  
Earth Abundant

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.

Strongly electrophilic heteroatoms confined in atomic CoOOH nanosheets realizing efficient electrocatalytic water oxidation

2018 ◽  
Vol 6 (7) ◽  
pp. 3202-3210 ◽  
Author(s):  
Yuanyuan Huang ◽  
Xu Zhao ◽  
Fumin Tang ◽  
Xusheng Zheng ◽  
Weiren Cheng ◽  
...  
Keyword(s):  
Water Oxidation ◽  
Tafel Slope ◽  
Onset Potential

We design Mn-confined CoOOH nanosheets that actively catalyze water oxidation with a low onset potential of 1.43 Vvs.RHE and a small Tafel slope of ∼38 mV dec−1.

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.

Hierarchically nanostructured MoS2 with rich in-plane edges as a high-performance electrocatalyst for the hydrogen evolution reaction

2016 ◽  
Vol 4 (38) ◽  
pp. 14577-14585 ◽  
Author(s):  
Haoliang Huang ◽  
Liqin Chen ◽  
Chuanhe Liu ◽  
Xinshun Liu ◽  
Senxuan Fang ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
High Performance ◽  
Tafel Slope ◽  
Onset Potential

Hierarchical MoS2 with a rich in-plane edge nanostructure is synthesized and exhibits surging HER activity with a low onset potential and Tafel slope.

Cathodic shift of onset potential for water oxidation on a Ti4+doped Fe2O3photoanode by suppressing the back reaction

2014 ◽  
Vol 7 (2) ◽  
pp. 752-759 ◽  
Author(s):  
Dapeng Cao ◽  
Wenjun Luo ◽  
Jianyong Feng ◽  
Xin Zhao ◽  
Zhaosheng Li ◽  
...  
Keyword(s):  
Water Oxidation ◽  
Back Reaction ◽  
Onset Potential

scholarly journals Photocatalytic water oxidation with a Prussian blue modified brown TiO2

2021 ◽  
Author(s):  
Gulsum Gundogdu ◽  
T. Gamze Ulusoy Ghobadi ◽  
Sina Sadigh Akbari ◽  
Ekmel Ozbay ◽  
Ferdi Karadas
Keyword(s):  
Prussian Blue ◽  
Water Oxidation ◽  
Prussian Blue Analogue ◽  
Earth Abundant

A CoFe Prussian blue analogue is coupled with brown TiO2 nanoparticles to achieve an earth-abundant photocatalytic water oxidation assembly.

scholarly journals Cover Feature: Tailoring a Zinc Oxide Nanorod Surface by Adding an Earth‐Abundant Cocatalyst for Induced Sunlight Water Oxidation (ChemPhysChem 6/2020)

ChemPhysChem ◽  
2020 ◽  
Vol 21 (6) ◽  
pp. 465-465
Author(s):  
Rafael M. Almeida ◽  
Victoria C. Ferrari ◽  
Juliana S. Souza ◽  
Flavio L. Souza ◽  
Wendel A. Alves
Keyword(s):  
Zinc Oxide ◽  
Water Oxidation ◽  
Earth Abundant

Co-doped carbon layer to lower the onset potential of hematite for solar water oxidation

2019 ◽  
Vol 258 ◽  
pp. 117962 ◽  
Author(s):  
Huiwen Lan ◽  
Yujian Xia ◽  
Kun Feng ◽  
Aimin Wei ◽  
Zhenhui Kang ◽  
...  
Keyword(s):  
Water Oxidation ◽  
Carbon Layer ◽  
Onset Potential ◽  
Solar Water ◽  
Solar Water Oxidation ◽  
Co Doped

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.

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