Electrochemical Water Splitting: Bridging the Gaps Between Fundamental Research and Industrial Applications

Energy & environment materials, Journal Year: 2022, Volume and Issue: 6(5)

Published: May 28, 2022

Electrochemical water splitting represents one of the most promising technologies to produce green hydrogen, which can help realize goal achieving carbon neutrality. While substantial efforts on a laboratory scale have been made for understanding fundamental catalysis and developing high‐performance electrocatalysts two half‐reactions involved in electrocatalysis, much less attention has paid doing relevant research larger scale. For example, few such researches done an industrial Herein, we review very recent endeavors bridge gaps between applications electrolysis. We begin by introducing fundamentals electrochemical then present comparisons testing protocol, figure merit, catalyst interest, manufacturing cost industry‐based water‐electrolysis research. Special is tracking surface reconstruction process identifying real catalytic species under different conditions, highlight significant distinctions corresponding mechanisms. Advances designs industry‐relevant electrolysis are also summarized, reveal progress moving practical forward accelerating synergies material science engineering. Perspectives challenges electrocatalyst design strategies proposed finally further lab‐scale large‐scale electrocatalysis applications.

Language: Английский

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Designing a Built-In Electric Field for Efficient Energy Electrocatalysis

ACS Nano, Journal Year: 2022, Volume and Issue: 16(12), P. 19959 - 19979

Published: Dec. 15, 2022

To utilize intermittent renewable energy as well achieve the goals of peak carbon dioxide emissions and neutrality, various electrocatalytic devices have been developed. However, reactions, e.g., hydrogen evolution reaction/oxygen reaction in overall water splitting, polysulfide conversion lithium–sulfur batteries, formation/decomposition lithium peroxide lithium–oxygen nitrate reduction to degrade sewage, suffer from sluggish kinetics caused by multielectron transfer processes. Owing merits accelerated charge transport, optimized adsorption/desorption intermediates, raised conductivity, regulation microenvironment, ease combine with geometric characteristics, built-in electric field (BIEF) is expected overcome above problems. Here, we give a Review about very recent progress BIEF for efficient electrocatalysis. First, construction strategies characterization methods (qualitative quantitative analysis) are summarized. Then, up-to-date overviews engineering electrocatalysis, attention on electron structure optimization microenvironment modulation, analyzed discussed detail. In end, challenges perspectives proposed. This gives deep understanding design electrocatalysts next-generation storage devices.

Language: Английский

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Improved Interface Charge Transfer and Redistribution in CuO‐CoOOH p‐n Heterojunction Nanoarray Electrocatalyst for Enhanced Oxygen Evolution Reaction

Advanced Science, Journal Year: 2021, Volume and Issue: 8(22)

Published: Oct. 12, 2021

Abstract Electron density modulation is of great importance in an attempt to achieve highly active electrocatalysts for the oxygen evolution reaction (OER). Here, successful construction CuO@CoOOH p‐n heterojunction (i.e., p‐type CuO and n‐type CoOOH) nanoarray electrocatalyst through situ anodic oxidation CuO@CoS x on copper foam reported. The can remarkably modify electronic properties space‐charge region facilitate electron transfer. Moreover, Raman study reveals generation SO 4 2− from CoS oxidation, cloud distribution functional theory calculation suggest that surface‐adsorbed OER process by enhancing adsorption OH − . positively charged CoOOH significantly enhance activity. As a result, shows enhanced performance with low overpotential 186 mV afford current 10 mA cm −2 preparation large scale (14 × 25 2 ) sample demonstrates possibility promoting catalyst industrial‐scale production. This offers new insights into design fabrication non‐noble metal‐based as effective catalytic materials energy storage conversion.

Language: Английский

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Cation Defect Engineering of Transition Metal Electrocatalysts for Oxygen Evolution Reaction

Advanced Energy Materials, Journal Year: 2022, Volume and Issue: 12(45)

Published: Sept. 30, 2022

Abstract The rational design and development of highly efficient oxygen evolution reaction (OER) electrocatalysts is vital for the application renewable energy devices. Recently, strategy defect engineering draws much attention due to its positive effect on regulating electronic structure, thus, promoting electrocatalytic performance various materials. In this review, main focus cation vacancy defects transition metal‐based electrocatalysts; latest progress in OER summarized. different effects are well discussed together with mechanism, mainly including improving conductivity, optimizing adsorption key intermediates, guiding surface reconstruction form active species, enhancing long‐term stability. Then, methods construct characterization vacancies systematically introduced. Finally, remaining challenges future prospects further proposed.

Language: Английский

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Operando Identification of Active Species and Intermediates on Sulfide Interfaced by Fe₃O₄ for Ultrastable Alkaline Oxygen Evolution at Large Current Density

ACS Catalysis, Journal Year: 2022, Volume and Issue: 12(8), P. 4318 - 4326

Published: March 28, 2022

Transition-metal sulfides are investigated as promising electrocatalysts for oxygen evolution reaction (OER) in alkaline media; however, the real active species remain elusive and development of oxyhydroxides reconstructed from delivering stable large current density at low applied potentials is a great challenge. Here, we report synergistic hybrid catalyst, composed nanoscale heterostructures Co9S8 Fe3O4, that exhibits only potential 350 mV record stability 120 h 500 mA cm–2 1.0 M KOH. Voltage-dependent soft X-ray absorption spectroscopy (XAS) Operando Raman demonstrate initial Co9S8@Fe3O4 into CoOOH/CoOx@Fe3O4 further to complete CoOOH@Fe3O4. XAS electron microscopy imaging analyses reveal completely CoOOH acts Fe3O4 components prevent aggregation CoOOH. infrared indicates cobalt superoxide (*OOH) intermediates during OER process. Density functional theory calculations formation *OOH rate-determining step CoOOH@Fe3O4 lower energy barrier OER. Our results provide an in-depth understanding dynamic surface structure evolutions sulfide insights design excellent nanocatalysts density.

Language: Английский

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Deciphering the Space Charge Effect of the p–n Junction between Copper Sulfides and Molybdenum Selenides for Efficient Water Electrolysis in a Wide pH Range

ACS Nano, Journal Year: 2022, Volume and Issue: 16(9), P. 15425 - 15439

Published: Aug. 29, 2022

Space charge transfer is crucial for an efficient electrocatalytic process, especially narrow-band-gap metal sulfides/selenides. Herein, we designed and synthesized a core-shell structure which ultrathin MoSe2 nanosheet coated CuS hollow nanoboxes (CuS@MoSe2) to form open p-n junction structure. The space effect in the region will greatly improve electron mass conduction, also have abundant active interfaces. It was used as bifunctional electrocatalyst water oxidation at wide pH range. exhibits low overpotential of 49 mV HER 236 OER current density 10 mA·cm-2 acidic pH, 72 219 alkaline 62 230 under neutral conditions. experimental results functional theory calculations testify that CuS@MoSe2 has strong with synergistic effect. built-in field can boost transport during process stabilize charged center junction. This be beneficial performance. work provides understanding semiconductor heterojunction applications regulating electronic sites.

Language: Английский

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Enabling Internal Electric Fields to Enhance Energy and Environmental Catalysis

Advanced Energy Materials, Journal Year: 2023, Volume and Issue: 13(11)

Published: Jan. 29, 2023

Abstract Recent years have witnessed an upsurge of interest in exploiting advanced photo‐/electrocatalysts for efficient energy conversion and environmental remediation. Constructing internal electric fields has been highlighted as a rising star to help facilitate various catalytic processes, with the merits promoting charge transfer/separation, optimizing redox potential creating effective active/adsorption sites. Internal are usually formed by polarization uneven distributions between different constituent layers, which widely exist piezoelectrics, polar surface terminations, heterostructure materials. Herein, groundbreaking interdisciplinary overview latest advances construction improve photo(electro)catalytic electrocatalytic activity is provided. This critical review begins encyclopedic summary classification, advantages, synthesis strategies fields. Subsequently, identification methods thoroughly discussed based on characterization techniques, experiments, theoretical calculations, can provide profound guidance in‐depth study To elaborate theory–structure–activity relationships fields, corresponding reaction mechanisms, modification strategies, performance jointly discussed, along discussion their practical applications. Finally, insightful analysis challenges future prospects field‐based catalysts discussed.

Language: Английский

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Boosting ethanol oxidation by NiOOH-CuO nano-heterostructure for energy-saving hydrogen production and biomass upgrading

Applied Catalysis B Environment and Energy, Journal Year: 2023, Volume and Issue: 325, P. 122388 - 122388

Published: Jan. 7, 2023

Language: Английский

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When It's Heavier: Interfacial and Solvation Chemistry of Isotopes in Aqueous Electrolytes for Zn‐ion Batteries

Angewandte Chemie International Edition, Journal Year: 2023, Volume and Issue: 62(16)

Published: Feb. 21, 2023

The electrochemical effect of isotope (EEI) water is introduced in the Zn-ion batteries (ZIBs) electrolyte to deal with challenge severe side reactions and massive gas production. Due low diffusion strong coordination ions D

Language: Английский

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Regulation Strategy of Transition Metal Oxide-Based Electrocatalysts for Enhanced Oxygen Evolution Reaction

Accounts of Materials Research, Journal Year: 2022, Volume and Issue: 3(10), P. 1088 - 1100

Published: Sept. 26, 2022

ConspectusThe deployment of hydrogen as alternative energy carrier is a promising route to reduce the consumption fossil fuel and achieve "zero carbon" target. Water electrolysis, powered by renewable sources, regarded most environmentally friendly efficient technology for production. Generally, sluggish oxygen evolution reaction (OER) process at anode predominantly limits efficiency water electrolysis. Therefore, developing highly electrocatalysts accelerate OER kinetic has always been crucial hot topic. Recently, transition metal oxide (TMO)-based materials have attracted much attention because their facile fabrication, low cost, synergistic effects between coupled metals. However, further enhancement catalytic performance TMO encounters bottleneck originated from limited regulation strategies.Typically, strategies oxide-based could be classified into three different levels. (1) For bulk electrocatalyst, reducing particle size would generate more catalytically active sites, which usually adopted basic method enhance overall activities. simple reduction in demonstrated promotion performance, intrinsic activity individual sites still very low. (2) To TMO, mesoscale modulation are proposed, involve optimization interfaces where embedded in, including surface reconstruction, constructing heterostructure, phase engineering. (3) In addition interface modulation, remarkable focus on enhancing atomic level, such heteroatom doping, defect engineering, so on. themselves, recent advances that external field can also manipulate property TMO-based coupling with sites. All these afford considerable opportunities fundamental investigation practical applications electrocatalysts.In this Account, we highlighted progress electrocatalysts. We started introduction two mechanisms process. Then conducted an in-depth discussion about used activities electrocatalysts, application field. end Account summary current challenges point out some possible future designing

Language: Английский

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