Self‐Supported Transition‐Metal‐Based Electrocatalysts for Hydrogen and Oxygen Evolution

Advanced Materials, Год журнала: 2019, Номер 32(3)

Опубликована: Апрель 1, 2019

Abstract Electrochemical water splitting is a promising technology for sustainable conversion, storage, and transport of hydrogen energy. Searching earth‐abundant hydrogen/oxygen evolution reaction (HER/OER) electrocatalysts with high activity durability to replace noble‐metal‐based catalysts plays paramount importance in the scalable application electrolysis. A freestanding electrode architecture highly attractive as compared conventional coated powdery form because enhanced kinetics stability. Herein, recent progress developing transition‐metal‐based HER/OER electrocatalytic materials reviewed selected examples chalcogenides, phosphides, carbides, nitrides, alloys, phosphates, oxides, hydroxides, oxyhydroxides. Focusing on self‐supported electrodes, latest advances their structural design, controllable synthesis, mechanistic understanding, strategies performance enhancement are presented. Remaining challenges future perspectives further development also discussed.

Язык: Английский

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Clean and Affordable Hydrogen Fuel from Alkaline Water Splitting: Past, Recent Progress, and Future Prospects

Advanced Materials, Год журнала: 2021, Номер 33(31)

Опубликована: Июнь 12, 2021

Abstract Hydrogen economy has emerged as a very promising alternative to the current hydrocarbon economy, which involves process of harvesting renewable energy split water into hydrogen and oxygen then further utilization clean fuel. The production by electrolysis is an essential prerequisite with zero carbon emission. Among various technologies, alkaline splitting been commercialized for more than 100 years, representing most mature economic technology. Here, historic development overviewed, several critical electrochemical parameters are discussed. After that, advanced nonprecious metal electrocatalysts that recently negotiating evolution reaction (OER) (HER) discussed, including transition oxides, (oxy)hydroxides, chalcogenides, phosphides, nitrides OER, well alloys, carbides HER. In this section, particular attention paid catalyst synthesis, activity stability challenges, performance improvement, industry‐relevant developments. Some recent works about scaled‐up novel electrode designs, seawater also spotlighted. Finally, outlook on future challenges opportunities offered, potential directions speculated.

Язык: Английский

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Non-noble metal-nitride based electrocatalysts for high-performance alkaline seawater electrolysis

Nature Communications, Год журнала: 2019, Номер 10(1)

Опубликована: Ноя. 8, 2019

Abstract Seawater is one of the most abundant natural resources on our planet. Electrolysis seawater not only a promising approach to produce clean hydrogen energy, but also great significance desalination. The implementation electrolysis requires robust and efficient electrocatalysts that can sustain splitting without chloride corrosion, especially for anode. Here we report three-dimensional core-shell metal-nitride catalyst consisting NiFeN nanoparticles uniformly decorated NiMoN nanorods supported Ni foam, which serves as an eminently active durable oxygen evolution reaction alkaline electrolysis. Combined with nanorods, have achieved industrially required current densities 500 1000 mA cm −2 at record low voltages 1.608 1.709 V, respectively, overall 60 °C. This discovery significantly advances development large-scale production.

Язык: Английский

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Exceptional performance of hierarchical Ni–Fe oxyhydroxide@NiFe alloy nanowire array electrocatalysts for large current density water splitting

Energy & Environmental Science, Год журнала: 2019, Номер 13(1), С. 86 - 95

Опубликована: Окт. 8, 2019

Exceptionally high OER & HER performances were achieved by rationally designing the electrode structure of non-noble NiFe materials.

Язык: Английский

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Atomic-level insight into super-efficient electrocatalytic oxygen evolution on iron and vanadium co-doped nickel (oxy)hydroxide

Nature Communications, Год журнала: 2018, Номер 9(1)

Опубликована: Июль 17, 2018

It is of great importance to understand the origin high oxygen-evolving activity state-of-the-art multimetal oxides/(oxy)hydroxides at atomic level. Herein we report an evident improvement oxygen evolution reaction via incorporating iron and vanadium into nickel hydroxide lattices. X-ray photoelectron/absorption spectroscopies reveal synergistic interaction between iron/vanadium dopants in host matrix, which subtly modulates local coordination environments electronic structures iron/vanadium/nickel cations. Further, in-situ absorption spectroscopic analyses manifest contraction metal-oxygen bond lengths activated catalyst, with a short vanadium-oxygen distance. Density functional theory calculations indicate that site co-doped (oxy)hydroxide gives near-optimal binding energies intermediates has lower overpotential compared sites. These findings suggest doped distorted geometric disturbed makes crucial contribution trimetallic catalyst.

Язык: Английский

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Support and Interface Effects in Water‐Splitting Electrocatalysts

Advanced Materials, Год журнала: 2019, Номер 31(31)

Опубликована: Март 6, 2019

Water-splitting electrolyzers that can convert electricity into storable hydrogen are a fascinating and scalable energy conversion technology for the utilization of renewable energies. To speed up sluggish oxygen evolution reactions (HER OER), electrocatalysts essential reducing their kinetic barriers eventually improving efficiency. As efficient strategies modulating binding ability water-splitting intermediates on electrocatalyst surface, support effect interface drawing growing attention. Herein, some recent research progress effects in HER, OER, overall is highlighted. Specifically, correlation between electronic interaction constituent components electrocatalytic performance profoundly discussed, with aim advancing development highly electrocatalysts, which may replace noble-metal-based bring practically widespread reality.

Язык: Английский

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Ultrafast room-temperature synthesis of porous S-doped Ni/Fe (oxy)hydroxide electrodes for oxygen evolution catalysis in seawater splitting

Energy & Environmental Science, Год журнала: 2020, Номер 13(10), С. 3439 - 3446

Опубликована: Янв. 1, 2020

A robust oxygen-evolving electrocatalyst for high-performance seawater splitting was developed using a cost-effective and industrially compatible method.

Язык: Английский

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Single Atoms and Clusters Based Nanomaterials for Hydrogen Evolution, Oxygen Evolution Reactions, and Full Water Splitting

Advanced Energy Materials, Год журнала: 2019, Номер 9(22)

Опубликована: Май 2, 2019

Abstract The sustainable and scalable production of hydrogen through evolution reaction (HER) oxygen (OER) in water splitting demands efficient robust electrocatalysts. Currently, state‐of‐the‐art electrocatalysts Pt IrO 2 /RuO exhibit the benchmark catalytic activity toward HER OER, respectively. However, expanding their practical application is hindered by exorbitant price scarcity. Therefore, development alternative effective for crucial. In last few decades, substantial effort has been devoted to HER/OER catalysts based on various transition metals (including Fe, Co, Ni, Mo, atomic Pt) which show promising activities durability. this review, after a brief introduction basic mechanism HER/OER, authors systematically discuss recent progress design, synthesis, single atom cluster‐based catalysts. Moreover, crucial factors that can tune such as morphology, crystal defects, hybridization with nonmetals, heteroatom doping, alloying, formation inside graphitic layered materials are discussed. Finally, existing challenges future perspectives improving performance addressed.

Язык: Английский

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

Advanced Energy Materials, Год журнала: 2019, Номер 9(17)

Опубликована: Март 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.

Язык: Английский

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

Advanced Science, Год журнала: 2018, Номер 5(8)

Опубликована: Май 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.

Язык: Английский

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