Designing Oxide Catalysts for Oxygen Electrocatalysis: Insights from Mechanism to Application

Nano-Micro Letters, Journal Year: 2023, Volume and Issue: 15(1)

Published: July 29, 2023

Abstract The electrochemical oxygen reduction reaction (ORR) and evolution (OER) are fundamental processes in a range of energy conversion devices such as fuel cells metal–air batteries. ORR OER both have significant activation barriers, which severely limit the overall performance that utilize ORR/OER. Meanwhile, is another very important involving has been widely investigated. occurs aqueous solutions via two pathways: direct 4-electron or 2-electron pathways from O 2 to water (H O) hydrogen peroxide ). Noble metal electrocatalysts often used catalyze ORR, despite fact noble certain intrinsic limitations, low storage. Thus, it urgent develop more active stable low-cost electrocatalysts, especially for severe environments (e.g., acidic media). Theoretically, an ideal electrocatalyst should provide adequate binding species. Transition metals not belonging platinum group metal-based oxides substance could give d orbital species binding. As result, transition regarded substitute typical precious electrocatalysts. However, development oxide catalysts reactions still faces challenges, e.g., catalytic activity, stability, cost, mechanism. We discuss principles underlying design catalysts, including influence crystal structure, electronic structure on their performance. also challenges associated with developing potential strategies overcome these challenges.

Language: Английский

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Next-Generation Green Hydrogen: Progress and Perspective from Electricity, Catalyst to Electrolyte in Electrocatalytic Water Splitting

Nano-Micro Letters, Journal Year: 2024, Volume and Issue: 16(1)

Published: July 5, 2024

Green hydrogen from electrolysis of water has attracted widespread attention as a renewable power source. Among several production methods, it become the most promising technology. However, there is no large-scale system currently that can compete with conventional fossil fuel production. Renewable energy electrocatalytic splitting an ideal technology environmental cleanliness protection and good purity, which meet requirements future development. This review summarizes introduces current status by three aspects: electricity, catalyst electrolyte. In particular, present situation latest progress key sources power, catalytic materials electrolyzers for are introduced. Finally, problems generation electrolytic directions next-generation green in discussed outlooked. It expected this will have important impact on field water.

Language: Английский

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Internal Polarization Field Induced Hydroxyl Spillover Effect for Industrial Water Splitting Electrolyzers

Nano-Micro Letters, Journal Year: 2023, Volume and Issue: 16(1)

Published: Nov. 30, 2023

The formation of multiple oxygen intermediates supporting efficient evolution reaction (OER) are affinitive with hydroxyl adsorption. However, ability the catalyst to capture and maintain continuous supply at active sits remains a tremendous challenge. Herein, an affordable Ni

Language: Английский

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Enhanced Electron Delocalization within Coherent Nano‐Heterocrystal Ensembles for Optimizing Polysulfide Conversion in High‐Energy‐Density Li‐S Batteries

Advanced Materials, Journal Year: 2023, Volume and Issue: 36(13)

Published: Dec. 25, 2023

Abstract Commercialization of high energy density Lithium‐Sulfur (Li‐S) batteries is impeded by challenges such as polysulfide shuttling, sluggish reaction kinetics, and limited Li + transport. Herein, a jigsaw‐inspired catalyst design strategy that involves in situ assembly coherent nano‐heterocrystal ensembles (CNEs) to stabilize high‐activity crystal facets, enhance electron delocalization, reduce associated barriers proposed. On the surface, stabilized facets induce aggregation. Simultaneously, surrounded surface with enhanced activity promote 2 S deposition diffusion, synergistically facilitating continuous efficient sulfur redox. Experimental DFT computations results reveal dual‐component hetero‐facet alters coordination Nb atoms, enabling redistribution 3D orbital electrons at center promoting d‐p hybridization sulfur. The CNE, based on level gradient lattice matching, endows maximum transfer catalysts establishes smooth pathways for ion diffusion. Encouragingly, NbN‐NbC‐based pouch battery delivers Weight 357 Wh kg −1 , thereby demonstrating practical application value CNEs. This work unveils novel paradigm designing high‐performance catalysts, which has potential shape future research electrocatalysts storage applications.

Language: Английский

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Recent Advances in Co‐Based Electrocatalysts for Hydrogen Evolution Reaction

Small, Journal Year: 2023, Volume and Issue: 19(45)

Published: July 11, 2023

Abstract Water splitting is a promising technique in the sustainable “green hydrogen” generation to meet energy demands of modern society. Its industrial application heavily dependent on development novel catalysts with high performance and low cost for hydrogen evolution reaction (HER). As typical non‐precious metal, cobalt‐based have gained tremendous attention recent years shown great prospect commercialization. However, complexity composition structure newly‐developed Co‐based make it urgent comprehensively retrospect summarize their advance design strategies. Hence, this review, mechanism HER first introduced possible role Co component during electrocatalysis discussed. Then, various strategies that could effectively enhance intrinsic activity are summarized, including surface vacancy engineering, heteroatom doping, phase facet regulation, heterostructure construction, support effect. The progress advanced electrocatalysts discussed, emphasizing above can significantly improve by regulating electronic optimizing binding crucial intermediates. At last, prospects challenges according viewpoint from fundamental explorations applications.

Language: Английский

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A review of typical transition metal phosphides electrocatalysts for hydrogen evolution reaction

International Journal of Hydrogen Energy, Journal Year: 2023, Volume and Issue: 52, P. 350 - 375

Published: Sept. 12, 2023

Language: Английский

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In situ self-reconstructed hierarchical bimetallic oxyhydroxide nanosheets of metallic sulfides for high-efficiency electrochemical water splitting

Materials Horizons, Journal Year: 2024, Volume and Issue: 11(7), P. 1797 - 1807

Published: Jan. 1, 2024

The obtained bimetallic sulfide catalyst can be reconstituted as FeCoOOH, which has high efficacy for water splitting. activation energy barrier of key reaction steps effectively reduced by dual-metal cooperation.

Language: Английский

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Facet-Dependent Lattice Oxygen Activation on Oxygen-Defective Co₃O₄ for Electrocatalytic Oxygen Evolution Reaction

ACS Energy Letters, Journal Year: 2024, Volume and Issue: 9(5), P. 2182 - 2192

Published: April 12, 2024

Introducing oxygen vacancies into Co-based oxides with different surface structures can significantly affect their coordination environments and electronic structures, possibly contributing to the variation of electrocatalytic evolution reaction (OER) activity. Herein, were introduced Co3O4 cubes truncated octahedrons uncover effects facets (001) (111) on intrinsic OER activity oxygen-defective Co3O4. The (001)-faceted exhibited a lower onset overpotential 298 mV than that multifaceted (335 mV) because sufficient lattice participation in process. Theoretical calculations revealed vacancy surfaces upshift O 2p band center trigger oxidation mechanism while matched well absorbate mechanism. This work offers new insight for designing electrocatalysts by selectively introducing defects well-defined crystal facets.

Language: Английский

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Design and regulation of defective electrocatalysts

Chemical Society Reviews, Journal Year: 2024, Volume and Issue: unknown

Published: Jan. 1, 2024

This review focuses on the synthesis and characterization of defective electrocatalysts, internal correlation between defects catalytic activity, development application electrocatalysts in various fields.

Language: Английский

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Current Status and Perspectives of Dual-Atom Catalysts Towards Sustainable Energy Utilization

Nano-Micro Letters, Journal Year: 2024, Volume and Issue: 16(1)

Published: Feb. 29, 2024

Abstract The exploration of sustainable energy utilization requires the implementation advanced electrochemical devices for efficient conversion and storage, which are enabled by usage cost-effective, high-performance electrocatalysts. Currently, heterogeneous atomically dispersed catalysts considered as potential candidates a wide range applications. Compared to conventional catalysts, metal atoms in carbon-based have more unsaturated coordination sites, quantum size effect, strong metal–support interactions, resulting exceptional catalytic activity. Of these, dual-atomic (DACs) attracted extensive attention due additional synergistic effect between two adjacent atoms. DACs advantages full active site exposure, high selectivity, theoretical 100% atom utilization, ability break scaling relationship adsorption free on sites. In this review, we summarize recent research advancement DACs, includes (1) comprehensive understanding synergy atomic pairs; (2) synthesis DACs; (3) characterization methods, especially aberration-corrected scanning transmission electron microscopy synchrotron spectroscopy; (4) energy-related last part focuses great catalysis small molecules, such oxygen reduction reaction, CO 2 hydrogen evolution N reaction. future challenges opportunities also raised prospective section.

Language: Английский

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