Relation between Water Oxidation Activity and Coordination Environment of C,N-Coordinated Mononuclear Co Catalyst

ACS Catalysis ◽  
2021 ◽  
pp. 491-496
Author(s):  
Qing’e Huang ◽  
Binli Wang ◽  
Sheng Ye ◽  
Hua Liu ◽  
Haibo Chi ◽  
...  
Keyword(s):  
Water Oxidation ◽  
Oxidation Activity ◽  
Co Catalyst ◽  
Coordination Environment

scholarly journals Co3O4/BiVO4 Heterostructures for Photochemical Water Oxidation: The Role of Synthesis Parameters and Preparation Route for the Physico-Chemical Properties and the Catalytic Activity

2019 ◽  
Vol 0 (0) ◽  
Author(s):  
Manuel Heimann ◽  
Klaus Friedel Ortega ◽  
Malte Behrens
Keyword(s):  
Water Oxidation ◽  
Ph Value ◽  
Chemical Properties ◽  
Catalyst Particle ◽  
Impregnation Method ◽  
Oxidation Activity ◽  
Co Catalyst ◽  
Synthesis Conditions ◽  
Vis Spectroscopy ◽  
Co Precipitation

Abstract The synthesis conditions of the semiconductor BiVO4 have marked influence on its physicochemical and photocatalytic properties. In this work, a pH-controlled co-precipitation route was systematically investigated. Special attention was paid to the pH value during co-precipitation and co-precipitate post-treatment. In a sacrificial photocatalytic water oxidation test, the highest activity was observed for a sample precipitated at pH = 1 and 70 °C, which was post treated at 600 °C in air for 3 h after washing and drying. The activity was further improved by another 90% by the addition of the Co3O4-based co-catalyst. Good synergy between semiconductor and co-catalyst was obtained for the deposition of pre-formed nanoparticles at a loading of 0.1 w% (physical impregnation). The effects of different synthesis conditions of the semiconductor and impregnation method for the co-catalyst on the structure, morphology and optical properties of the catalysts were investigated by PXRD, SEM, UV-vis spectroscopy, and TEM, while the water oxidation activity was compared in the dark and with the aid of visible light using cerium (IV) or silver (I) as sacrificial agents, respectively, with the aim of establishing structure-activity correlations. The roles of semiconductor particle anisotropy and co-catalyst particle distribution for optimal photo-activity in the oxygen evolution reaction are discussed.

scholarly journals Sulfur-Doped BiOCl with Enhanced Light Absorption and Photocatalytic Water Oxidation Activity

Nanomaterials ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 2221
Author(s):  
Ruilian Qi ◽  
Jian Liu ◽  
Huanxiang Yuan ◽  
Yu Yu
Keyword(s):  
Light Absorption ◽  
Water Oxidation ◽  
Photocatalytic Performance ◽  
Theoretical Calculations ◽  
Environmental Concerns ◽  
Oxidation Activity ◽  
Co Catalyst ◽  
Oxidation Properties ◽  
Powerful Strategy ◽  
Visible Light Photocatalytic

Photocatalysis is a powerful strategy to address energy and environmental concerns. Sulfur-doped BiOCl was prepared through a facial hydrothermal method to improve the photocatalytic performance. Experimental results and theoretical calculations demonstrated that the band structure of the sulfur-doped BiOCl was optimally regulated and the light absorption range was expanded. It showed excellent visible-light photocatalytic water oxidation properties with a rate of 141.7 μmol h−1 g−1 (almost 44 times of that of the commercial BiOCl) with Pt as co-catalyst.

scholarly journals Origin of enhanced water oxidation activity in an iridium single atom anchored on NiFe oxyhydroxide catalyst

2021 ◽  
Vol 118 (36) ◽  
pp. e2101817118
Author(s):  
Xueli Zheng ◽  
Jing Tang ◽  
Alessandro Gallo ◽  
Jose A. Garrido Torres ◽  
Xiaoyun Yu ◽  
...  
Keyword(s):  
Water Oxidation ◽  
Active Sites ◽  
High Performance ◽  
Operating Conditions ◽  
Utilization Efficiency ◽  
Oxidation Catalyst ◽  
Single Atom ◽  
Photochemical Reduction ◽  
Oxidation Activity ◽  
Coordination Environment

The efficiency of the synthesis of renewable fuels and feedstocks from electrical sources is limited, at present, by the sluggish water oxidation reaction. Single-atom catalysts (SACs) with a controllable coordination environment and exceptional atom utilization efficiency open new paradigms toward designing high-performance water oxidation catalysts. Here, using operando X-ray absorption spectroscopy measurements with calculations of spectra and electrochemical activity, we demonstrate that the origin of water oxidation activity of IrNiFe SACs is the presence of highly oxidized Ir single atom (Ir5.3+) in the NiFe oxyhydroxide under operating conditions. We show that the optimal water oxidation catalyst could be achieved by systematically increasing the oxidation state and modulating the coordination environment of the Ir active sites anchored atop the NiFe oxyhydroxide layers. Based on the proposed mechanism, we have successfully anchored Ir single-atom sites on NiFe oxyhydroxides (Ir0.1/Ni9Fe SAC) via a unique in situ cryogenic–photochemical reduction method that delivers an overpotential of 183 mV at 10 mA ⋅ cm−2 and retains its performance following 100 h of operation in 1 M KOH electrolyte, outperforming the reported catalysts and the commercial IrO2 catalysts. These findings open the avenue toward an atomic-level understanding of the oxygen evolution of catalytic centers under in operando conditions.

scholarly journals Correction to Synthesis, Characterization, and Water Oxidation Activity of Isomeric Ru Complexes

2021 ◽  
Vol 60 (9) ◽  
pp. 6852-6852
Author(s):  
Md Asmaul Hoque ◽  
Abhishek Dutta Chowdhury ◽  
Somnath Maji ◽  
Jordi Benet-Buchholz ◽  
Mehmed Z. Ertem ◽  
...  
Keyword(s):  
Water Oxidation ◽  
Oxidation Activity ◽  
Ru Complexes

Water oxidation activity of azo‐azomethine‐based Ni (II), Co (II), and Cu (II) complexes

2021 ◽  
Vol 35 (3) ◽  
Author(s):  
Zohreh Shaghaghi ◽  
Parya Sallakh Kouhsangini ◽  
Rahim Mohammad‐Rezaei
Keyword(s):  
Water Oxidation ◽  
Oxidation Activity

Bifunctional citrate-Ni0.9Co0.1(OH)x layer coated fluorine-doped hematite for simultaneous hole extraction and injection towards efficient photoelectrochemical water oxidation

Nanoscale ◽  
2021 ◽  
Author(s):  
Peng Wang ◽  
Feng Li ◽  
Xuefeng Long ◽  
Tong Wang ◽  
Huan Chai ◽  
...  
Keyword(s):  
Surface Modification ◽  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Water Oxidation ◽  
Surface Oxygen ◽  
Co Catalyst ◽  
Photoelectrochemical Water Oxidation

Surface modification by loading a water oxidation co-catalyst (WOC) is generally considered to be an efficient means to optimize the sluggish surface oxygen evolution reaction (OER) of hematite photoanode for...

Fluorine-surface-modified tin-doped hematite nanorod array photoelectrodes with enhanced water oxidation activity

2021 ◽  
pp. 149898
Author(s):  
Nguyen Duc Quang ◽  
Phuoc Cao Van ◽  
Duc Duy Le ◽  
Sutripto Majumder ◽  
Nguyen Duc Chinh ◽  
...  
Keyword(s):  
Water Oxidation ◽  
Nanorod Array ◽  
Oxidation Activity ◽  
Surface Modified

Improving photoelectrochemical water oxidation activity of BiFeO3 photoanode via surface passivation

2021 ◽  
Vol 119 (1) ◽  
pp. 013903
Author(s):  
Qian Yu ◽  
Minji Yang ◽  
Xin Luo ◽  
Zeyu Fan ◽  
Qianbao Wu ◽  
...  
Keyword(s):  
Water Oxidation ◽  
Surface Passivation ◽  
Oxidation Activity ◽  
Photoelectrochemical Water Oxidation

scholarly journals Hydrophobic Interactions of Ru-bda-Type Catalysts for Promoting Water Oxidation Activity

2021 ◽  
Author(s):  
Tianqi Liu ◽  
Ge Li ◽  
Nannan Shen ◽  
Mårten S. G. Ahlquist ◽  
Licheng Sun
Keyword(s):  
Water Oxidation ◽  
Hydrophobic Interactions ◽  
Oxidation Activity
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