Advanced electrocatalysts with unusual active sites for electrochemical water splitting

InfoMat, Journal Year: 2023, Volume and Issue: 6(1)

Published: Nov. 27, 2023

Abstract Electrochemical water splitting represents a promising technology for green hydrogen production. To design advanced electrocatalysts, it is crucial to identify their active sites and interpret the relationship between structures performance. Materials extensively studied as electrocatalysts include noble‐metal‐based (e.g., Ru, Ir, Pt) non‐noble‐metal‐based 3d transition metals) compounds. Recently, advancements in characterization techniques theoretical calculations have revealed novel unusual sites. The present review highlights latest achievements discovery identification of various unconventional electrochemical splitting, with focus on state‐of‐the‐art strategies determining true establishing structure–activity relationships. Furthermore, we discuss remaining challenges future perspectives development next‐generation By presenting fresh perspective reaction involved this aims provide valuable guidance study industrial applications. image

Language: Английский

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Trends and Prospects of Bulk and Single‐Atom Catalysts for the Oxygen Evolution Reaction

Advanced Energy Materials, Journal Year: 2023, Volume and Issue: 13(17)

Published: March 20, 2023

Abstract Electrolytic hydrogen is expected to play a key role in the production of green fuels and chemicals, while contributing balancing consumption supply future electricity grid relying largely on intermittent renewable sources for energy production. However, oxygen evolution reaction (OER) major bottleneck boosting conversion efficiency due sluggish kinetics four‐electron transfer process. Intensive research efforts are thus directed toward development advanced OER electrocatalysts. This review aims at bringing together recent advances bulk single‐atom electrocatalysts (SACs) OER. Starting from established understanding mechanism, it offers an overview state‐of‐the‐art materials OER, highlighting current directions shortcomings The final part addresses novel SACs, covering their performance as well synthetic routes characterization techniques that shine light geometric electronic configuration SACs. experimental findings complimented with theoretical insights density functional theory (DFT). article concludes summary along opportunities further improve activity SACs

Language: Английский

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Atomic‐Scale Configuration Enables Fast Hydrogen Migration for Electrocatalysis of Acidic Hydrogen Evolution

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(43)

Published: June 27, 2023

Abstract The efficiency of hydrogen evolution reaction (HER) electrocatalysts under acidic conditions is largely determined by the equilibrium adsorption/desorption on catalyst surface. A promising strategy for enhancing performance multimetal‐supported HER utilization spillover. However, current heterostructured catalysts often present challenges such as high interfacial transport barriers, extended paths, and intricate synthesis processes. Addressing these limitations, a novel orthorhombic SrHf 1− x Ru O 3− δ perovskite oxide proposed an exemplary model atomic‐level configuration design strategy. This material exhibits unique synergistic effect multiple catalytic sites between Hf/Ru pairs, overcoming aforementioned challenges. study presents new cooperative mechanism HER, consisting three steps: proton adsorption Hf site, migration via strong O‐bridge H 2 detachment from active site. conductivity unusual charge redistribution within Hf‐O‐Ru structure further enhance specific activity . research paves way designing high‐performance media, leveraging spillover atomic‐scale configurations. findings have significant implications development efficient, cost‐effective, environmentally friendly production technologies.

Language: Английский

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Unraveling Quantum Mysteries: Probing the Interplay of CdS Quantum Dots and g-C₃N₄ Nanosheets for Enhanced Photo/Electrocatalytic Hydrogen Evolution

The Journal of Physical Chemistry C, Journal Year: 2023, Volume and Issue: 128(1), P. 85 - 94

Published: Dec. 27, 2023

A series of CdS quantum dots (QDs) at low temperature were grown on the nanosheets (NSs) g-C3N4 through an in situ successive ionic layer adsorption and reaction process. The visible light active band gap ultrathin NSs has attracted more attention due to its essential bandgap for water splitting reaction. However, a single catalyst with limited number sites does not exhibit significant photo/electrocatalytic activity hydrogen production. In current strategies, development photogenerated charge transfer-driven type-II QDs/g-C3N4 heterostructure demonstrates enhanced evolution amount 14.8 mmol gcat–1 H2 gas AQY 27.6% as result decreased transfer resistance significantly increased electrochemical surface area. Additionally, as-prepared shown overpotentials 182 382 mV (HER) oxygen (OER) reactions reach density 10 mA cm–2, respectively. addition, bifunctional electrocatalyst exhibits 4- 6-fold higher mass material OER HER compared g-C3N4, considerable faradaic efficiency under potentiostatic system, Moreover, remarkable was well explained photoluminescence quenching effect Mott–Schottky analysis.

Language: Английский

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Modulation Strategies for the Preparation of High‐Performance Catalysts for Urea Oxidation Reaction and Their Applications

Small, Journal Year: 2023, Volume and Issue: 19(45)

Published: July 11, 2023

Abstract Compared with the traditional electrolysis of water to produce hydrogen, urea‐assisted hydrogen has significant advantages and received extensive attention from researchers. Unfortunately, urea oxidation reaction (UOR) involves a complex six‐electron transfer process leading high overpotential, which forces researchers develop high‐performance UOR catalysts drive development splitting. Based on mechanism literature research, this review summarizes strategies for preparing highly efficient catalysts. First, is introduced characteristics excellent are pointed out. Aiming at this, following modulation proposed improve catalytic performance based summarizing various literature: 1) Accelerating active phase formation reduce initial potential; 2) Creating double sites trigger new mechanism; 3) adsorption promoting C─N bond cleavage ensure effective conduct UOR; 4) Promoting desorption CO 2 stability prevent catalyst poisoning; 5) electron overcome inherent slow dynamics 6) Increasing or surface area. Then, application in electrochemical devices summarized. Finally, current deficiencies future directions discussed.

Language: Английский

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Accelerated deprotonation with a hydroxy-silicon alkali solid for rechargeable zinc-air batteries

Nature Communications, Journal Year: 2023, Volume and Issue: 14(1)

Published: Nov. 1, 2023

Transition metal oxides are promising electrocatalysts for zinc-air batteries, yet surface reconstruction caused by the adsorbate evolution mechanism, which induces zinc-ion battery behavior in oxygen reaction, leads to poor cycling performance. In this study, we propose a lattice mechanism involving proton acceptors overcome performance of OER process. We introduce stable solid base, hydroxy BaCaSiO4, onto surfaces PrBa0.5Ca0.5Co2O5+δ perovskite nanofibers with one-step exsolution strategy. The HO-Si sites on BaCaSiO4 significantly accelerate transfer from OH* adsorbed during As proof concept, rechargeable assembled composite electrocatalyst is an alkaline environment over 150 hours at 5 mA cm-2 galvanostatic charge/discharge tests. Our findings open new avenues designing efficient batteries.

Language: Английский

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FeCo alloy/N, S co-doped carbon aerogel derived from directional-casting cellulose nanofibers for rechargeable liquid flow and flexible Zn-air batteries

Nano Research, Journal Year: 2023, Volume and Issue: 16(5), P. 6870 - 6880

Published: Feb. 8, 2023

Language: Английский

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Anchored Cobalt Nanoparticles on Layered Perovskites for Rapid Peroxymonosulfate Activation in Antibiotic Degradation

Advanced Materials, Journal Year: 2024, Volume and Issue: 36(27)

Published: April 16, 2024

Abstract In the Fenton‐like reaction, revealing dynamic evolution of active sites is crucial to achieve activity improvement and stability catalyst. This study reports a perovskite oxide in which atomic (Co 0 ) situ embedded exsolution occurs during high‐temperature phase transition. unique anchoring strategy significantly improves Co 3+ /Co 2+ cycling efficiency at interface inhibits metal leaching peroxymonosulfate (PMS) activation. The Co@L‐PBMC catalyst exhibits superior PMS activation ability could 99% degradation tetracycline within 5 min. combination experimental characterization density functional theory (DFT) calculations elucidates that electron‐deficient oxygen vacancy accepts an electron from 3d‐orbital, resulting significant delocalization site, thereby facilitating adsorption *HSO /*OH intermediate onto “metal‐V O bridge” structure. work provides insights into mechanism level, will guide rational design next‐generation catalysts for environmental remediation.

Language: Английский

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General Scalable Synthesis of Mesoporous Metal Oxide Nanosheets with High Crystallinity for Ultralong‐Life Li–S Batteries

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: 34(25)

Published: Jan. 15, 2024

Abstract Mesoporous metal oxide nanosheets (MMONs) are demonstrated great promise for various catalytic applications such as water splitting, CO 2 reduction, and metal–sulfur batteries. However, limited by the conventional high‐temperature synthetic routes, prepared MMONs expose only a small portion of effective sites, which greatly restricts their electrocatalytic activity. Herein, facile general glycine‐assisted strategy is developed to synthesize series with high crystallinity remarkable porosity. Impressively, single‐phase perovskite type containing up ten cations can be synthesized easily using this method without any further purification step. As proof concept, Li–S cell mesoporous LaFe 0.4 Co 0.2 Ni Cu O 3 catalyst achieves superior ultralong cycling life over 1500 cycles at C 0.041% capacity decay per cycle areal reaching 6.0 mAh cm −2 low electrolyte/sulfur ratio 5.9 µL mg −1 . The improved performance attributed abundant active sites synergistic contribution multicomponent. This work paves new avenue synthesis advanced will inspire practical in different fields.

Language: Английский

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Microwave-assisted PMS activation Ti3C2/LaFe0.5Cu0.5O3-P catalysts for efficient degradation of CIP: Enhancement of catalytic performance by phosphoric acid etching

Separation and Purification Technology, Journal Year: 2024, Volume and Issue: 354, P. 129357 - 129357

Published: Aug. 25, 2024

Language: Английский

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