Surface reconstruction establishing Mott-Schottky heterojunction and built-in space-charging effect accelerating oxygen evolution reaction

Kang, Yao; Wang, Shuo; Hui, Kwan San; Wu, Shuxing; Dinh, Duc Anh; Fan, Xi; Feng, Bin; Chen, Fuming; Geng, Jianxin; Cheong, Weng‐Chon; Hui, Kwun Nam

doi:10.1007/s12274-021-3917-7

Cited by 21 publications

(9 citation statements)

References 55 publications

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“…When metal and semiconductor are highly coupled and the Fermi level of metal is lower than that of the n-type semiconductor or higher than that of the p-type semiconductor, the formed metal–semiconductor interface is called a Mott–Schottky heterojunction, − which is similar to a p–n heterojunction. Taking a metal-n-type semiconductor as an example, after contact, electrons will transfer from the n-type semiconductor to metal due to the different work function and enrich in the metal region.…”

Section: Bief In Electrocatalysismentioning

confidence: 99%

Designing a Built-In Electric Field for Efficient Energy Electrocatalysis

et al. 2022

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

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Section: Bief In Electrocatalysismentioning

confidence: 99%

Designing a Built-In Electric Field for Efficient Energy Electrocatalysis

et al. 2022

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“…In the first step, through the hydrothermal reaction, Ni(OH) 2 was made followed by phosphidation of Ni(OH) 2 to convert into Ni 2 P. In the final step, FeOOH was electrodeposited on Ni 2 P forming a Ni 2 P/FeOOH heterojunction. Kang and co-workers developed F-incorporated Ni(OH) 2 nanowires on NF by the hydrothermal method, which during OER the outer layer transformed into F-NiOOH forming a F-NiOOH/F-Ni(OH) 2 p – n heterojunction. Such in situ generation of a p – n heterojunction was found to be very effective and even beneficial toward OER activity.…”

Section: Strategies To Fabricate Heterojunctionsmentioning

confidence: 99%

Heterojunction Engineering for Electrocatalytic Applications

Pal

Ahmed

Khatun

et al. 2023

ACS Appl. Energy Mater.

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Production of green hydrogen from the electrolysis of water is considered to be one of the most desirable processes to address the clean energy demand. However, a high energy barrier and an economically unsustainable nature limit the process toward practical implementation in an extensive way. The designing of an electrocatalyst accompanied by defect engineering, heteroatom doping, and strain creation are known to be effective strategies to make the process efficient. Recently, construction of heterojunctions with a combination of materials with desired band structures is considered to be a smart approach in promoting electrocatalytic activities by attaining charge redistribution and manipulating the electronic structure at the interface. The present review elaborately discusses possible heterojunctions, alterations at the interface, insight thermodynamics, and possible causes for boosting electrocatalytic activities. The heterojunction-based electrocatalysts are found not only effective for oxygen evolution reactions and hydrogen evolution reactions, but also to be very useful toward various electrochemical oxidation reactions as well as electrochemical reduction reactions involving small molecules undergoing decomposition at very low energy. Having such a specialty, there is no doubt that heterojunction-based electrocatalysts are going to be the primary choices of researchers in coming years.

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“…The F−Ni(OH) 2 -SR-200 electrode exhibited an η10 of 420 mV, favoring OER catalytic activity. 166 Alternatively, Wang et al investigated a 3D freestanding NiFe(oxy)hydroxide (NiFe(OH) x ) based electrode with a Schottky junction of metal-like Ni 3 S 2 scaffolds that were executed in situ on a conventional Ni mesh (NM) covered by NiFe(OH) x NSs. The Ni 3 S 2 interlayer generated the heterojunction contacts that connected NiFe(OH) x and the NM substrate.…”

Section: Metal−metal Nitridesmentioning

confidence: 99%

Review of Mott–Schottky-Based Nanoscale Catalysts for Electrochemical Water Splitting

Krishnamachari,

Lenus,

Pradeeswari

et al. 2023

ACS Appl. Nano Mater.

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Fundamental structural modification of nanomaterials perpetually presents a phenomenal technique to control the electronic structure of active sites, thereby improving the electrocatalytic activities. Nevertheless, appropriate surface reconstruction is necessary to overcome the large electrochemical overpotential that remains unexplored. In such scenarios, a deep understanding of fundamental structural modification mechanisms, including the Janus structure, spillover effect, d-band center shift theory, and interfacial coupling, is essential. One such fundamental interface and valence engineering strategy includes the Mott–Schottky (M–S) effect. Recently, M–S heterostructure catalysts have piqued the interest of researchers due to their ability to enable mass transport, regulate the density of states, enable continuous rapid electron transfer via band bending, and create a synergistic effect at the metal–semiconductor interface. In recent years, there has been a rise in the number of publications related to the M–S effect on electrocatalysis. In this review, we comprehensively summarize the M–S mechanism and the structural advantages of the M–S heterointerface with various nanoscale featured transition metal nitrides, phosphides, carbides, oxides, hydroxides, chalcogenides, and noble metal composites. Finally, we briefly propose the obstacles, limitations, possibilities, and future directions for M–S heterostructure catalysts in water electrolysis.

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Surface reconstruction establishing Mott-Schottky heterojunction and built-in space-charging effect accelerating oxygen evolution reaction

Cited by 21 publications

References 55 publications

Designing a Built-In Electric Field for Efficient Energy Electrocatalysis

Designing a Built-In Electric Field for Efficient Energy Electrocatalysis

Heterojunction Engineering for Electrocatalytic Applications

Review of Mott–Schottky-Based Nanoscale Catalysts for Electrochemical Water Splitting

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