The roles of oxygen vacancies in electrocatalytic oxygen evolution reaction

Nano Energy, Journal Year: 2020, Volume and Issue: 73, P. 104761 - 104761

Published: April 15, 2020

Language: Английский

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Advanced Transition Metal‐Based OER Electrocatalysts: Current Status, Opportunities, and Challenges

Small, Journal Year: 2021, Volume and Issue: 17(37)

Published: June 10, 2021

Abstract Oxygen evolution reaction (OER) is an important half‐reaction involved in many electrochemical applications, such as water splitting and rechargeable metal–air batteries. However, the sluggish kinetics of its four‐electron transfer process becomes a bottleneck to performance enhancement. Thus, rational design electrocatalysts for OER based on thorough understanding mechanisms structure‐activity relationship vital significance. This review begins with introduction which include conventional adsorbate mechanism lattice‐oxygen‐mediated mechanism. The pathways related intermediates are discussed detail, several descriptors greatly assist catalyst screen optimization summarized. Some parameters suggested measurement criteria also mentioned discussed. Then, recent developments breakthroughs experimental achievements transition metal‐based reviewed reveal novel principles. Finally, some perspectives future directions proposed further catalytic enhancement deeper design. It believed that iterative improvements fundamental principles essential realize applications efficient energy storage conversion technologies.

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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Recent Progress on Layered Double Hydroxides and Their Derivatives for Electrocatalytic Water Splitting

Advanced Science, Journal Year: 2018, Volume and Issue: 5(8)

Published: May 23, 2018

Abstract Layered double hydroxide (LDH)‐based materials have attracted widespread attention in various applications due to their unique layered structure with high specific surface area and electron distribution, resulting a good electrocatalytic performance. Moreover, the existence of multiple metal cations invests flexible tunability host layers; intercalation characteristics lead ion exchange exfoliation. Thus, performance can be tuned by regulating morphology, composition, ion, However, poor conductivity limits performance, which therefore has motivated researchers combine them conductive improve Another factor hampering activity is large lateral size bulk thickness LDHs. Introducing defects tuning electronic LDH‐based are considered effective strategies increase number active sites enhance intrinsic activity. Given advantages materials, derivatives been also used as advanced electrocatalysts for water splitting. Here, recent progress on LDHs splitting summarized, current designing proposed, significant challenges perspectives discussed.

Language: Английский

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Recent advances in transition metal-based electrocatalysts for alkaline hydrogen evolution

Journal of Materials Chemistry A, Journal Year: 2019, Volume and Issue: 7(25), P. 14971 - 15005

Published: Jan. 1, 2019

Transition metal-based electrocatalysts for alkaline hydrogen evolution reaction.

Language: Английский

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Overall electrochemical splitting of water at the heterogeneous interface of nickel and iron oxide

Nature Communications, Journal Year: 2019, Volume and Issue: 10(1)

Published: Dec. 6, 2019

Abstract Efficient generation of hydrogen from water-splitting is an underpinning chemistry to realize the economy. Low cost, transition metals such as nickel and iron-based oxides/hydroxides have been regarded promising catalysts for oxygen evolution reaction in alkaline media with overpotentials low ~200 mV achieve 10 mA cm −2 , however, they are generally unsuitable reaction. Herein, we show a Janus nanoparticle catalyst nickel–iron oxide interface multi-site functionality highly efficient comparable performance benchmark platinum on carbon catalyst. Density functional theory calculations reveal that catalytic activity induced by strong electronic coupling effect between iron at interface. Remarkably, also exhibits extraordinary activity, enabling active stable bi-functional whole cell with, best our knowledge, highest energy efficiency (83.7%) reported date.

Language: Английский

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Synergistic coupling of CoFe-LDH arrays with NiFe-LDH nanosheet for highly efficient overall water splitting in alkaline media

Applied Catalysis B Environment and Energy, Journal Year: 2019, Volume and Issue: 253, P. 131 - 139

Published: April 18, 2019

Language: Английский

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Bifunctional Heterostructured Transition Metal Phosphides for Efficient Electrochemical Water Splitting

Advanced Functional Materials, Journal Year: 2020, Volume and Issue: 30(34)

Published: June 29, 2020

Abstract Reducing green hydrogen production costs is essential for developing a economy. Developing cost‐effective electrocatalysts water electrolysis thus of great research interest. Among various material candidates, transition metal phosphides (TMP) have emerged as robust bifunctional both the evolution reaction (HER) and oxygen (OER) due to their phases tunable electronic structure. Recently, heterostructured catalysts exhibited significantly enhanced activities toward HER/OER. The enhancement can be attributed increased amount accessible active sites, accelerated mass/charge transfer, optimized adsorption intermediates, which arise from synergistic effects heterostructure. Herein, comprehensive overview recent progress TMP‐based heterostructure introduced provide an insight into preparation corresponding mechanisms. It starts with summarizing general fundamental aspects HER/OER effect heterostructures catalytic activity. Next, innovational strategies design construct overall splitting activity, well related mechanisms, are discussed in detail. Finally, summary perspective further opportunities challenges highlighted development points practical application mechanistic studies.

Language: Английский

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Metal oxide-based materials as an emerging family of hydrogen evolution electrocatalysts

Energy & Environmental Science, Journal Year: 2020, Volume and Issue: 13(10), P. 3361 - 3392

Published: Jan. 1, 2020

Metal oxide-based materials are emerging as a promising family of hydrogen evolution reaction (HER) electrocatalysts.

Language: Английский

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Heterogeneous Bimetallic Phosphide Ni₂P‐Fe₂P as an Efficient Bifunctional Catalyst for Water/Seawater Splitting

Advanced Functional Materials, Journal Year: 2020, Volume and Issue: 31(1)

Published: Sept. 28, 2020

Abstract Developing high‐performance and cost‐effective bifunctional electrocatalysts for large‐scale water electrolysis is desirable but remains a significant challenge. Most existing nano‐ micro‐structured require complex synthetic procedures, making scale‐up highly challenging. Here, heterogeneous Ni 2 P‐Fe P microsheet synthesized by directly soaking foam in hydrochloric acid an iron nitrate solution, followed phosphidation. Benefiting from high intrinsic activity, abundant active sites, superior transfer coefficient, this self‐supported electrocatalyst shows superb catalytic activity toward overall splitting, requiring low voltages of 1.682 1.865 V to attain current densities 100 500 mA cm −2 1 m KOH, respectively. Such performance the benchmark IrO || Pt/C pair also places among best catalysts reported thus far. Furthermore, its enhanced corrosion resistance hydrophilic surface make it suitable seawater splitting. It able achieve KOH at 1.811 2.004 V, respectively, which, together with robust durability, demonstrates great potential realistic electrolysis. This work presents general economic approach fabrication metallic phosphide water/seawater electrocatalysis.

Language: Английский

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