Emerging Two-Dimensional Nanomaterials for Electrocatalysis

Chemical Reviews, Год журнала: 2018, Номер 118(13), С. 6337 - 6408

Опубликована: Март 19, 2018

Over the past few decades, design and development of advanced electrocatalysts for efficient energy conversion technologies have been subjects extensive study. With discovery graphene, two-dimensional (2D) nanomaterials emerged as some most promising candidates heterogeneous due to their unique physical, chemical, electronic properties. Here, we review 2D-nanomaterial-based selected electrocatalytic processes. We first discuss advances in 2D based on different compositions functions followed by specific principles. Following this overview, various processes involved water cycle, carbon nitrogen cycle from fundamental conception functional application. place a significant emphasis engineering strategies influence these intrinsic material performance, such properties adsorption energetics. Finally, feature opportunities challenges ahead electrocatalysts. By considering theoretical calculations, surface characterization, electrochemical tests, describe relationships between structure, energy, apparent activity wide variety with goal providing better understanding emerging at atomic level.

Язык: Английский

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General synthesis and definitive structural identification of MN4C4 single-atom catalysts with tunable electrocatalytic activities

Nature Catalysis, Год журнала: 2017, Номер 1(1), С. 63 - 72

Опубликована: Дек. 22, 2017

Язык: Английский

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Transition‐Metal (Co, Ni, and Fe)‐Based Electrocatalysts for the Water Oxidation Reaction

Advanced Materials, Год журнала: 2016, Номер 28(42), С. 9266 - 9291

Опубликована: Авг. 29, 2016

Increasing energy demands and environment awareness have promoted extensive research on the development of alternative conversion storage technologies with high efficiency environmental friendliness. Among them, water splitting is very appealing, receiving more attention. The critical challenge this renewable-energy technology to expedite oxygen evolution reaction (OER) because its slow kinetics large overpotential. Therefore, developing efficient electrocatalysts catalytic activities great importance for high-performance splitting. In past few years, much effort has been devoted OER based transition-metal elements that are low-cost, highly efficient, excellent stability. Here, recent progress design, synthesis, application elements, including Co, Ni, Fe, summarized, some invigorating perspectives future developments provided.

Язык: Английский

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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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Electrocatalytic oxygen evolution reaction for energy conversion and storage: A comprehensive review

Nano Energy, Год журнала: 2017, Номер 37, С. 136 - 157

Опубликована: Май 10, 2017

Язык: Английский

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Earth-Abundant Heterogeneous Water Oxidation Catalysts

Chemical Reviews, Год журнала: 2016, Номер 116(22), С. 14120 - 14136

Опубликована: Окт. 31, 2016

Water oxidation is a key chemical transformation for the conversion of solar energy into fuels. Our review focuses on recent work robust earth-abundant heterogeneous catalysts oxygen-evolving reaction (OER). We point out that improvements in performance OER will depend critically success aimed at understanding barriers based atomic-level mechanisms. highlight challenge obtaining acid-stable catalysts, with proposals elements could be employed to reach this goal. suggest future advances fuels science accelerated by development new methods materials synthesis and characterization, along in-depth investigations redox mechanisms catalytic surfaces.

Язык: Английский

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Transition Metal Oxides as Electrocatalysts for the Oxygen Evolution Reaction in Alkaline Solutions: An Application-Inspired Renaissance

Journal of the American Chemical Society, Год журнала: 2018, Номер 140(25), С. 7748 - 7759

Опубликована: Май 22, 2018

Water splitting is the essential chemical reaction to enable storage of intermittent energies such as solar and wind in form hydrogen fuel. The oxygen evolution (OER) often considered bottleneck water splitting. Though metal oxides had been reported OER electrocatalysts more than half a century ago, recent interest renewable energy has spurred renaissance studies transition Earth-abundant nonprecious catalysts. This Perspective presents major progress several key areas field theoretical understanding, activity trend, situ operando characterization, active site determination, novel materials. A personal overview past achievements future challenges also provided.

Язык: Английский

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Spinels: Controlled Preparation, Oxygen Reduction/Evolution Reaction Application, and Beyond

Chemical Reviews, Год журнала: 2017, Номер 117(15), С. 10121 - 10211

Опубликована: Июль 26, 2017

Spinels with the formula of AB2O4 (where A and B are metal ions) properties magnetism, optics, electricity, catalysis have taken significant roles in applications data storage, biotechnology, electronics, laser, sensor, conversion reaction, energy storage/conversion, which largely depend on their precise structures compositions. In this review, various spinels controlled preparations oxygen reduction/evolution reaction (ORR/OER) beyond summarized. First, composition structure introduced. Then, recent advances preparation solid-, solution-, vapor-phase methods summarized, new particularly highlighted. The physicochemical characteristics such as compositions, structures, morphologies, defects, substrates been rationally regulated through approaches. This regulation can yield improved ORR/OER catalytic activities, further accelerate speed, prolong life, narrow polarization fuel cells, metal-air batteries, water splitting devices. Finally, magnetic, optical, electrical, OER/ORR also discussed. future considered to be closely related environmental issues, will aided by development species advanced characterizations.

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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Atomically dispersed Fe ³⁺ sites catalyze efficient CO ₂ electroreduction to CO

Science, Год журнала: 2019, Номер 364(6445), С. 1091 - 1094

Опубликована: Июнь 13, 2019

Currently, the most active electrocatalysts for conversion of CO2 to CO are gold-based nanomaterials, whereas non-precious metal catalysts have shown low modest activity. Here, we report a catalyst dispersed single-atom iron sites that produces at an overpotential as 80 millivolts. Partial current density reaches 94 milliamperes per square centimeter 340 Operando x-ray absorption spectroscopy revealed be discrete Fe3+ ions, coordinated pyrrolic nitrogen (N) atoms N-doped carbon support, maintain their +3 oxidation state during electrocatalysis, probably through electronic coupling conductive support. Electrochemical data suggest derive superior activity from faster adsorption and weaker than conventional Fe2+ sites.

Язык: Английский

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