scholarly journals A comparison of the chemical, optical and electrocatalytic properties of water-oxidation catalysts for use in integrated solar-fuel generators

2017 ◽  
Vol 10 (4) ◽  
pp. 987-1002 ◽  
Author(s):  
Ke Sun ◽  
Ivan A. Moreno-Hernandez ◽  
William C. Schmidt ◽  
Xinghao Zhou ◽  
J. Chance Crompton ◽  
...  
Keyword(s):  
Optical Properties ◽  
Water Oxidation ◽  
Oxidation Catalyst ◽  
Oxidation Catalysts ◽  
Solar Fuel ◽  
Electrocatalytic Properties ◽  
Electrocatalytic Performance

Thein situoptical properties and electrocatalytic performance of representative water-oxidation catalyst have been considered.

In Situ Formation of Efficient Cobalt-Based Water Oxidation Catalysts from Co2+-Containing Tungstate and Molybdate Solutions

2015 ◽  
Vol 10 (10) ◽  
pp. 2228-2233 ◽  
Author(s):  
Biaobiao Zhang ◽  
Xiujuan Wu ◽  
Fei Li ◽  
Fengshou Yu ◽  
Yong Wang ◽  
...  
Keyword(s):  
Water Oxidation ◽  
Oxidation Catalysts ◽  
In Situ Formation

In-Situ Electrochemical Construction of Stable Water Oxidation Catalysts

2021 ◽  
Vol MA2021-01 (38) ◽  
pp. 1222-1222
Author(s):  
Jiaye Chen ◽  
Dongsheng Geng
Keyword(s):  
Water Oxidation ◽  
Oxidation Catalysts

Hexagonal nanoplates of NiO/CoO/Fe2O3 composite acting as an efficient photocatalytic and electrocatalytic water oxidation catalyst

2015 ◽  
Vol 44 (35) ◽  
pp. 15628-15635 ◽  
Author(s):  
Yukun Zhao ◽  
Yan Zhang ◽  
Yong Ding ◽  
Mindong Chen
Keyword(s):  
Hydrothermal Method ◽  
Water Oxidation ◽  
Oxidation Catalyst ◽  
Electrocatalytic Performance ◽  
Co Precipitation ◽  
Hexagonal Sheet ◽  
Hexagonal Nanoplates

The unique hexagonal sheet-shaped NiO/CoO/Fe2O3 composite fabricated through a co-precipitation and hydrothermal method demonstrates robust photocatalytic and electrocatalytic performance for water oxidation.

scholarly journals In Situ EPR Characterization of a Cobalt Oxide Water Oxidation Catalyst at Neutral pH

Catalysts ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 926 ◽  
Author(s):  
Yury Kutin ◽  
Nicholas Cox ◽  
Wolfgang Lubitz ◽  
Alexander Schnegg ◽  
Olaf Rüdiger
Keyword(s):  
Cobalt Oxide ◽  
Water Oxidation ◽  
Large Scale ◽  
Low Cost ◽  
Operating Conditions ◽  
Oxidation Catalyst ◽  
O2 Evolution ◽  
Ligand Field ◽  
Neutral Ph

Here we report an in situ electron paramagnetic resonance (EPR) study of a low-cost, high-stability cobalt oxide electrodeposited material (Co-Pi) that oxidizes water at neutral pH and low over-potential, representing a promising system for future large-scale water splitting applications. Using CW X-band EPR we can follow the film formation from a Co(NO3)2 solution in phosphate buffer and quantify Co uptake into the catalytic film. As deposited, the film shows predominantly a Co(II) EPR signal, which converts into a Co(IV) signal as the electrode potential is increased. A purpose-built spectroelectrochemical cell allowed us to quantify the extent of Co(II) to Co(IV) conversion as a function of potential bias under operating conditions. Consistent with its role as an intermediate, Co(IV) is formed at potentials commensurate with electrocatalytic O2 evolution (+1.2 V, vs. SHE). The EPR resonance position of the Co(IV) species shifts to higher fields as the potential is increased above 1.2 V. Such a shift of the Co(IV) signal may be assigned to changes in the local Co structure, displaying a more distorted ligand field or more ligand radical character, suggesting it is this subset of sites that represents the catalytically ‘active’ component. The described spectroelectrochemical approach provides new information on catalyst function and reaction pathways of water oxidation.

Sub-5 nm palladium nanoparticles in situ embedded in N-doped carbon nanoframes: facile synthesis, excellent sinter resistance and electrocatalytic properties

2019 ◽  
Vol 7 (46) ◽  
pp. 26243-26249 ◽  
Author(s):  
Xian Jiang ◽  
Jiaxin Wang ◽  
Tan Huang ◽  
Gengtao Fu ◽  
Yawen Tang ◽  
...  
Keyword(s):  
Palladium Nanoparticles ◽  
Pd Nanoparticles ◽  
Facile Synthesis ◽  
Electrocatalytic Properties ◽  
Electrocatalytic Performance

N-carbon nanoframes embedded with sub-5 nm Pd nanoparticles are prepared through a 1-naphthylamine-driven pyrolysis strategy and exhibit excellent bifunctional electrocatalytic performance.

scholarly journals Understanding the performance of a bisphosphonate Ru water oxidation catalyst

2020 ◽  
Vol 49 (40) ◽  
pp. 14052-14060
Author(s):  
Jesús A. Luque-Urrutia ◽  
Jayneil M. Kamdar ◽  
Douglas B. Grotjahn ◽  
Miquel Solà ◽  
Albert Poater
Keyword(s):  
Water Oxidation ◽  
Clean Energy ◽  
Oxidation Catalyst ◽  
Oxidation Catalysts

Water oxidation catalysts (WOCs) are a key part of generating H2 from water and sunlight, consequently, it is a promising process for the production of clean energy.

scholarly journals Synthesis of an amorphous Geobacter-manganese oxide biohybrid as an efficient water oxidation catalyst

2020 ◽  
Vol 22 (17) ◽  
pp. 5610-5618
Author(s):  
Shafeer Kalathil ◽  
Krishna P. Katuri ◽  
Pascal E. Saikaly
Keyword(s):  
Manganese Oxide ◽  
Water Oxidation ◽  
Geobacter Sulfurreducens ◽  
Oxidation Catalyst ◽  
Oxidation Catalysts

Self-decorated Mn2O3 nanocrystals on Geobacter sulfurreducens were synthesized as sustainable and efficient water oxidation catalysts.

(Invited) Visible Light-Driven Water Oxidation with Porphyrin Sensitizers and Water Oxidation Catalysts

2018 ◽  
Vol MA2018-01 (31) ◽  
pp. 1852-1852
Author(s):  
Hiroshi Imahori
Keyword(s):  
Excited State ◽  
Visible Light ◽  
Water Oxidation ◽  
Light Harvesting ◽  
Visible Region ◽  
Oxidation Catalyst ◽  
Efficient Production ◽  
Oxidation Catalysts ◽  
Visible Light Driven ◽  
Artificial Photosynthetic

Exporing renewable energy sources is an important task in making our society sustainable. In this regard, use of sunlight as an infinite energy source is fascinating. Specifically, realizing artificial photosynthesis, i.e., integration of light-harvesting, multi-step electron and proton transfer, and water oxidation for the efficient production of solar fuels, is a great challenge in chemistry. For the purpose, dye-sensitized photoelectrosynthesis cells (DSPSC) have been investigated, as the heterogeneous water splitting on inorganic semiconductors is promising for the upcoming large scale device operation. In DSPSC a molecular sensitizer adsorbed on a semiconducting electrode harvests visible light and injects an electron from the excited-state of the sensitizer (S*) to a conduction band (CB) of the electrode. Then, the sensitizer radical cation (S• +) extracts an electron from a water oxidation catalyst (WOC) to regenerate the sensitizer and one-electron oxidized WOC. After reiterating the cycle, high oxidation states of the WOC are produced, eventually transforming two water molecules into four protons and one oxygen molecule. As the sensitizer bis(2,2’-bipyridine)(4,4’-diphosphonato-2,2’-bipyridine)ruthenium(II) (RuP) has been frequently employed for the construction of molecule-based artificial photosynthetic systems, owing to its sufficient first oxidation potential for water oxidation and a long lifetime of its excited state for electron injection. However, the light-harvesting ability of RuP is rather low in visible region beyond 500 nm. Considering that yellow to red photons mainly shower down on the earth from sun, use of photons in visible region is essential for efficient chemical conversion by sunlight. In this context, porphyrins are attractive as the sensitizer due to their excellent light-harvesting in visible region and facile tuning of their excited-states and redox properties by their chemical functionalization. Nevertheless, molecule-based artificial photosynthetic systems with porphyrins as the sensitizer have been very limited as the result of their poor performance. One plausible reason is the occurrence of fast charge recombination (CR) between the electron injected into the CB of TiO2 (denoted as TiO2(e−)) and S• +. CR from TiO2(e−) to the oxidized WOC would also take place within a few microsecond. Undesirable CR from TiO2(e−) to water is indicated. Thus, to overcome the disadvantages, it is crucial to optimize the electron transfer (ET) processes at the interfaces. In this talk, I will give an overview of our recent initiatives on visible light-driven water oxidation with novel porphyrin sensitizers and water oxidation catalysts. [1] M. Yamamoto, L. Wang, F. Li, T. Fukushima, K. Tanaka, L. Sun and H. Imahori, Chem. Sci., 7, 1430-1439 (2016). [2] M. Yamamoto, Y. Nishizawa, P. Chábera, F. Li, T. Pascher, V. Sundström, L. Sun, and H. Imahori, Chem. Commun., 52, 13702-13705 (2016). [3] M. Yamamoto, J. Föhlinger, J. Petersson, L. Hammarström, and H. Imahori, Angew. Chem. Int. Ed., 56, 3329-3333 (2017).

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