A review on fundamentals for designing oxygen evolution electrocatalysts

Chemical Society Reviews, Journal Year: 2020, Volume and Issue: 49(7), P. 2196 - 2214

Published: Jan. 1, 2020

The fundamentals related to the oxygen evolution reaction and catalyst design are summarized discussed.

Language: Английский

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Water electrolysis: from textbook knowledge to the latest scientific strategies and industrial developments

Chemical Society Reviews, Journal Year: 2022, Volume and Issue: 51(11), P. 4583 - 4762

Published: Jan. 1, 2022

Replacing fossil fuels with energy sources and carriers that are sustainable, environmentally benign, affordable is amongst the most pressing challenges for future socio-economic development.

Language: Английский

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Metallic nanostructures with low dimensionality for electrochemical water splitting

Chemical Society Reviews, Journal Year: 2020, Volume and Issue: 49(10), P. 3072 - 3106

Published: Jan. 1, 2020

The recent advances in 1D and 2D metallic nanostructures for electrochemical water splitting (HER OER) are highlighted.

Language: Английский

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Structural transformation of highly active metal–organic framework electrocatalysts during the oxygen evolution reaction

Nature Energy, Journal Year: 2020, Volume and Issue: 5(11), P. 881 - 890

Published: Oct. 26, 2020

Language: Английский

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“The Fe Effect”: A review unveiling the critical roles of Fe in enhancing OER activity of Ni and Co based catalysts

Nano Energy, Journal Year: 2020, Volume and Issue: 80, P. 105514 - 105514

Published: Oct. 17, 2020

Electrocatalytic oxygen evolution reaction (OER) catalyzed by non-precious metals and their compounds in alkaline medium is an attractive area of energy research for the generation hydrogen from water. The 3d transition metals, particularly, Ni Co show better OER activity than others medium. based oxygen-evolving catalysts (OECs) experience enormous enhancement either incidental or intentional Fe doping/incorporation. To account this, different roles that it exerts when incorporated into these OECs are reported to be responsible. Unfortunately, conclusions drawn many related studies often contradictory one another. Important are: 1) a few claim active site Ni/Co inactive while other act together OER, 2) Fe3+ stays unoxidized shows evidence existence Fe4+, 3) suggest faster OEC matrices but fail explain similar effects observed with matrices. Many critical experimental theoretical investigations have been made recently reveal this magical effect results those coherently presented here discussion. This review as inevitable know succeed efficient

Language: Английский

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2D Layered Double Hydroxides for Oxygen Evolution Reaction: From Fundamental Design to Application

Advanced Energy Materials, Journal Year: 2019, Volume and Issue: 9(17)

Published: March 3, 2019

Abstract The oxygen evolution reaction (OER) has aroused extensive interest from materials scientists in the past decade by virtue of its great significance energy storage/conversion systems such as water splitting, rechargeable metal–air batteries, carbon dioxide (CO 2 ) reduction, and fuel cells. Among all capable catalyzing OER, layered double hydroxides (LDHs) stand out one most effective electrocatalysts owing to their compositional structural flexibility well tenability simplicity preparation process. For this reason, numerous efforts have been dedicated adjusting structure, forming well‐defined morphology, developing methods LDHs promote electrocatalytic performance. In article, recent advances rational design LDH‐based toward OER are summarized. Specifically, various tactics for synthetic methods, composition regulations LDHs, further highlighted, followed a discussion on influential factors Finally, remaining challenges investigate improve ability LDH stated indicate possible future development LDHs.

Language: Английский

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

Nature Communications, Journal Year: 2020, Volume and Issue: 11(1)

Published: Aug. 13, 2020

Abstract Anodic oxygen evolution reaction (OER) is recognized as kinetic bottleneck in water electrolysis. Transition metal sites with high valence states can accelerate the kinetics to offer highly intrinsic activity, but suffer from thermodynamic formation barrier. Here, we show subtle engineering of oxidized Ni 4+ species surface reconstructed (oxy)hydroxides on multicomponent FeCoCrNi alloy film through interatomically electronic interplay. Our spectroscopic investigations theoretical studies uncover that Fe component enables species, which energetically favored by multistep 2+ →Ni 3+ . The dynamically constructed drives holes into ligands facilitate intramolecular coupling, triggering lattice activation form Fe-Ni dual-sites ultimate catalytic center activity. As a result, OER catalyst delivers outstanding mass activity and turnover frequency 3601 A g −1 0.483 s at an overpotential 300 mV alkaline electrolyte, respectively.

Language: Английский

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Engineering single-atomic ruthenium catalytic sites on defective nickel-iron layered double hydroxide for overall water splitting

Nature Communications, Journal Year: 2021, Volume and Issue: 12(1)

Published: July 28, 2021

Abstract Rational design of single atom catalyst is critical for efficient sustainable energy conversion. However, the atomic-level control active sites essential electrocatalytic materials in alkaline electrolyte. Moreover, well-defined surface structures lead to in-depth understanding catalytic mechanisms. Herein, we report a single-atomic-site ruthenium stabilized on defective nickel-iron layered double hydroxide nanosheets (Ru 1 /D-NiFe LDH). Under precise regulation local coordination environments catalytically and existence defects, Ru LDH delivers an ultralow overpotential 18 mV at 10 mA cm −2 hydrogen evolution reaction, surpassing commercial Pt/C catalyst. Density functional theory calculations reveal that optimizes adsorption energies intermediates reaction promotes O–O coupling Ru–O site oxygen reaction. The as ideal model reveals superior water splitting performance with potential development promising water-alkali electrocatalysts.

Language: Английский

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Co Nanoislands Rooted on Co–N–C Nanosheets as Efficient Oxygen Electrocatalyst for Zn–Air Batteries

Advanced Materials, Journal Year: 2019, Volume and Issue: 31(30)

Published: June 6, 2019

Developing non-precious-metal bifunctional oxygen reduction and evolution reaction (ORR/OER) catalysts is a major task for promoting the efficiency of Zn-air batteries. Co-based have been regarded as promising ORR OER owing to multivalence characteristic cobalt element. Herein, synthesis Co nanoislands rooted on Co-N-C nanosheets supported by carbon felts (Co/Co-N-C) reported. felt derived from electrodeposition are applied self-template source. The synergistic effect metal islands with activity superior performance leads good bifuctional catalytic performances. Wavelet transform extended X-ray absorption fine spectroscopy photoelectron certify formation (mainly Co0 ) Co2+ Co3+ structure. As air-cathode, assembled aqueous battery exhibits small charge-discharge voltage gap (0.82 V@10 mA cm-2 high power density 132 mW , outperforming commercial Pt/C catalyst. Additionally, cable flexible rechargeable excellent bendable durability. Density functional theory calculation combined operando further elucidate active sites reactions at Co/Co-N-C cathode in battery.

Language: Английский

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Amorphous Catalysts and Electrochemical Water Splitting: An Untold Story of Harmony

Small, Journal Year: 2019, Volume and Issue: 16(2)

Published: Dec. 11, 2019

Abstract In the near future, sustainable energy conversion and storage will largely depend on electrochemical splitting of water into hydrogen oxygen. Perceiving this, countless research works focussing fundamentals electrocatalysis performance improvements are being reported everyday around globe. Electrocatalysts high activity, selectivity, stability anticipated as they directly determine energy‐ cost efficiency electrolyzers. Amorphous electrocatalysts with several advantages over crystalline counterparts found to perform better in electrocatalytic splitting. There plenty studies witnessing enhancements while employing amorphous materials catalysts. The harmony between flexibility (both oxygen evolution reaction [OER] [HER]) is one untold unsummarized stories field This Review devoted comprehensively discussing upsurge addition that, basics also elaborately introduced characteristics a good electrocatalyst for OER HER discussed.

Language: Английский

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