Boosting Electrocatalytic Water Oxidation by Creating Defects and Lattice‐Oxygen Active Sites on Ni‐Fe Nanosheets

ChemSusChem ◽  
2020 ◽  
Vol 13 (18) ◽  
pp. 5067-5072 ◽  
Author(s):  
Chi Chen ◽  
Peili Zhang ◽  
Mei Wang ◽  
Dehua Zheng ◽  
Junchi Chen ◽  
...  
Keyword(s):  
Water Oxidation ◽  
Active Sites ◽  
Lattice Oxygen

scholarly journals Direct and indirect role of Fe doping in NiOOH monolayer for water oxidation catalysis

2021 ◽  
Author(s):  
Manish Kumar ◽  
Simone Piccinin ◽  
Varadharajan Srinivasan
Keyword(s):  
Water Oxidation ◽  
Active Sites ◽  
Oxidation Catalysis ◽  
Lattice Oxygen ◽  
Nucleophilic Attack ◽  
Different Types ◽  
Water Oxidation Catalysis ◽  
Experimental Findings ◽  
Precise Role

The oxygen evolution reaction (OER) activity of pristine NiOOH is enhanced by doping with Fe. However, the precise role of Fe is still being debated. Here, we use the first-principles DFT+U approach to study three different types of active sites: one on pristine and the other two on Fe-doped NiOOH monolayers to account for the direct and indirect roles of Fe. To compare the activity of the active sites, we consider two mechanisms of OER based on the source of O-O bond formation. Our results show that the mechanism involving the coupling of lattice oxygen is generally more favorable than water nucleophilic attack on lattice oxygen. On doping with Fe, the overpotential of NiOOH is reduced by 0.33 V in excellent agreement with experimental findings. Introducing Fe at active sites results in different potential determining steps (PDS) in the two mechanisms, whereas Ni sites in pristine and Fe-doped NiOOH have the same PDS regardless of the mechanism. The Fe sites not only have the lowest overpotential but also decrease the overpotential for Ni sites.

scholarly journals Correction: Activating the lattice oxygen in (Bi0.5Co0.5)2O3 by vacancy modulation for efficient electrochemical water oxidation

2021 ◽  
Vol 9 (8) ◽  
pp. 5111-5112
Author(s):  
Huan Liu ◽  
Xiaoning Li ◽  
Cailing Peng ◽  
Liuyang Zhu ◽  
Yuanxi Zhang ◽  
...  
Keyword(s):  
Water Oxidation ◽  
Lattice Oxygen

Correction for ‘Activating the lattice oxygen in (Bi0.5Co0.5)2O3 by vacancy modulation for efficient electrochemical water oxidation’ by Huan Liu et al., J. Mater. Chem. A, 2020, 8, 13150–13159, DOI: 10.1039/D0TA03411H.

Oriental and robust anchoring of Fe via anodic interfacial coordination assembly on ultrathin Co hydroxides for efficient water oxidation

Nanoscale ◽  
2021 ◽  
Author(s):  
Ya-Nan Zhou ◽  
Ruo-Yao Fan ◽  
Yu-Ning Cao ◽  
Hui-Ying Wang ◽  
Bin Dong ◽  
...  
Keyword(s):  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Water Oxidation ◽  
Active Sites

The oriental distribution and strong conjunction of Fe active sites in multiple metals hydroxides are very crucial to modulate the activity and stability for efficient oxygen evolution reaction (OER). Whereas,...

scholarly journals Nano-sized manganese oxides as biomimetic catalysts for water oxidation in artificial photosynthesis: a review

2012 ◽  
Vol 9 (75) ◽  
pp. 2383-2395 ◽  
Author(s):  
Mohammad Mahdi Najafpour ◽  
Fahimeh Rahimi ◽  
Eva-Mari Aro ◽  
Choon-Hwan Lee ◽  
Suleyman I. Allakhverdiev
Keyword(s):  
Hydrogen Production ◽  
Water Splitting ◽  
Water Oxidation ◽  
Active Sites ◽  
Manganese Oxides ◽  
Metal Compounds ◽  
Functional Models ◽  
Current Densities ◽  
Conversion Efficiencies ◽  
Manganese Compounds

There has been a tremendous surge in research on the synthesis of various metal compounds aimed at simulating the water-oxidizing complex (WOC) of photosystem II (PSII). This is crucial because the water oxidation half reaction is overwhelmingly rate-limiting and needs high over-voltage (approx. 1 V), which results in low conversion efficiencies when working at current densities required for hydrogen production via water splitting. Particular attention has been given to the manganese compounds not only because manganese has been used by nature to oxidize water but also because manganese is cheap and environmentally friendly. The manganese–calcium cluster in PSII has a dimension of about approximately 0.5 nm. Thus, nano-sized manganese compounds might be good structural and functional models for the cluster. As in the nanometre-size of the synthetic models, most of the active sites are at the surface, these compounds could be more efficient catalysts than micrometre (or bigger) particles. In this paper, we focus on nano-sized manganese oxides as functional and structural models of the WOC of PSII for hydrogen production via water splitting and review nano-sized manganese oxides used in water oxidation by some research groups.

scholarly journals Morphological and Elemental Investigations on Co–Fe–B–O Thin Films Deposited by Pulsed Laser Deposition for Alkaline Water Oxidation: Charge Exchange Efficiency as the Prevailing Factor in Comparison with the Adsorption Process

2021 ◽  
Author(s):  
Y. Popat ◽  
M. Orlandi ◽  
S. Gupta ◽  
N. Bazzanella ◽  
S. Pillai ◽  
...  
Keyword(s):  
Pulsed Laser Deposition ◽  
Water Oxidation ◽  
Active Sites ◽  
High Surface ◽  
Pulsed Laser ◽  
Industrial Applications ◽  
Active Species ◽  
Laser Deposition ◽  
Core Shell ◽  
Adsorption Sites

Abstract Mixed transition-metals oxide electrocatalysts have shown huge potential for electrochemical water oxidation due to their earth abundance, low cost and excellent electrocatalytic activity. Here we present Co–Fe–B–O coatings as oxygen evolution catalyst synthesized by Pulsed Laser Deposition (PLD) which provided flexibility to investigate the effect of morphology and structural transformation on the catalytic activity. As an unusual behaviour, nanomorphology of 3D-urchin-like particles assembled with crystallized CoFe2O4 nanowires, acquiring high surface area, displayed inferior performance as compared to core–shell particles with partially crystalline shell containing boron. The best electrochemical activity towards water oxidation in alkaline medium with an overpotential of 315 mV at 10 mA/cm2 along with a Tafel slope of 31.5 mV/dec was recorded with core–shell particle morphology. Systematic comparison with control samples highlighted the role of all the elements, with Co being the active element, boron prevents the complete oxidation of Co to form Co3+ active species (CoOOH), while Fe assists in reducing Co3+ to Co2+ so that these species are regenerated in the successive cycles. Thorough observation of results also indicates that the activity of the active sites play a dominating role in determining the performance of the electrocatalyst over the number of adsorption sites. The synthesized Co–Fe–B–O coatings displayed good stability and recyclability thereby showcasing potential for industrial applications. Graphic Abstract

Lattice Oxygen Redox Chemistry in Solid-State Electrocatalysts for Water Oxidation

2021 ◽  
Author(s):  
Ning Zhang ◽  
Yang Chai
Keyword(s):  
Solid State ◽  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Water Oxidation ◽  
Water Electrolysis ◽  
Redox Chemistry ◽  
Lattice Oxygen ◽  
Vital Importance ◽  
Production Of Hydrogen ◽  
Overall Efficiency

Fundamental understandings towards oxygen evolution reaction (OER) are of vital importance as it dominates the overall efficiency of water electrolysis – a compelling technique for sustainable production of hydrogen feedstock....

Activating the lattice oxygen in (Bi0.5Co0.5)2O3 by vacancy modulation for efficient electrochemical water oxidation

2020 ◽  
Vol 8 (26) ◽  
pp. 13150-13159
Author(s):  
Huan Liu ◽  
Xiaoning Li ◽  
Cailing Peng ◽  
Liuyang Zhu ◽  
Yuanxi Zhang ◽  
...  
Keyword(s):  
Water Oxidation ◽  
Lattice Oxygen ◽  
And Performance

Lattice-oxygen-active (Bi0.5Co0.5)2O3 was successfully prepared through vacancy modulation and demonstrated great OER activity and performance.

Constructing Chemical Interaction between Hematite and Carbon Nanosheets with Single Active Sites for Efficient Photo‐Electrochemical Water Oxidation

Small Methods ◽  
2020 ◽  
Vol 4 (12) ◽  
pp. 2000577
Author(s):  
Gaoliang Yang ◽  
Yunxiang Li ◽  
Huiwen Lin ◽  
Xiaohui Ren ◽  
Davin Philo ◽  
...  
Keyword(s):  
Water Oxidation ◽  
Active Sites ◽  
Chemical Interaction ◽  
Carbon Nanosheets

scholarly journals Lattice oxygen activation enabled by high-valence metal sites for enhanced water oxidation

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Ning Zhang ◽  
Xiaobin Feng ◽  
Dewei Rao ◽  
Xi Deng ◽  
Lejuan Cai ◽  
...  
Keyword(s):  
Water Oxidation ◽  
Oxygen Activation ◽  
Lattice Oxygen
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