Intermetallic Nanocrystals for Fuel-Cells-Based Electrocatalysis

Chemical Reviews, Год журнала: 2023, Номер 123(22), С. 12507 - 12593

Опубликована: Ноя. 1, 2023

Electrocatalysis underpins the renewable electrochemical conversions for sustainability, which further replies on metallic nanocrystals as vital electrocatalysts. Intermetallic have been known to show distinct properties compared their disordered counterparts, and long explored functional improvements. Tremendous progresses made in past few years, with notable trend of more precise engineering down an atomic level investigation transferring into practical membrane electrode assembly (MEA), motivates this timely review. After addressing basic thermodynamic kinetic fundamentals, we discuss classic latest synthetic strategies that enable not only formation intermetallic phase but also rational control other catalysis-determinant structural parameters, such size morphology. We demonstrate emerging nanomaterials potentially advancement energy electrocatalysis. Then, state-of-the-art characterizations representative electrocatalysts emphasis oxygen reduction reaction evaluated a MEA setup. summarize review by laying out existing challenges offering perspective future research directions toward practicing conversions.

Язык: Английский

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Advanced electrocatalysts with unusual active sites for electrochemical water splitting

InfoMat, Год журнала: 2023, Номер 6(1)

Опубликована: Ноя. 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

Язык: Английский

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Biaxially‐Strained Phthalocyanine at Polyoxometalate@Carbon Nanotube Heterostructure Boosts Oxygen Reduction Catalysis

Angewandte Chemie International Edition, Год журнала: 2023, Номер 62(42)

Опубликована: Авг. 31, 2023

Iron phthalocyanine (FePc) with unique FeN4 site has attracted increasing interests as a promising non-precious catalyst. However, the plane symmetric structure endows FePc undesired catalytic performance toward oxygen reduction reaction (ORR). Here, we report novel one-dimensional heterostructured ORR catalyst by coupling at polyoxometalate-encapsulated carbon nanotubes (FePc-{PW12 }@NTs) using host-guest chemistry. The encapsulation of polyoxometalates can induce local tensile strain single-walled NTs to strengthen interactions FePc. Both and curvature effects {PW12 }@NT scaffold tune geometric electronic localization centers enhance performance. As expected, such FePc-{PW12 electrocatalyst exhibits prominent durability, methanol tolerance, activity high half-wave potential 0.90 V low Tafel slope 30.9 mV dec-1 in alkaline medium. Besides, assembled zinc-air battery demonstrates an ultrahigh power density 280 mW cm-2 , excellent charge/discharge ability long-term stability over 500 h, outperforming that commercial Pt/C+IrO2 cathode. This study offers new strategy design catalysts opens avenue regulate electrocatalytic molecules.

Язык: Английский

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Identification and Understanding of Active Sites of Non‐Noble Iron‐Nitrogen‐Carbon Catalysts for Oxygen Reduction Electrocatalysis

Advanced Functional Materials, Год журнала: 2023, Номер 33(26)

Опубликована: Март 14, 2023

Non‐noble iron‐nitrogen‐carbon (Fe‐N‐C) catalysts have been explored as one type of the most promising alternatives precious platinum (Pt) in catalyzing oxygen reduction reaction (ORR). However, their catalytic ORR activity and stability still cannot meet requirement practical applications. Active sites such are key factors determining performance. This review gives a critical overview on identification understanding active sties non‐pyrolytic pyrolytic Fe‐N‐C terms design strategies, synthesis, characterization, functional mechanisms performance validation. The diversity complexity that greatly dominate progress include Fe‐containing (Fe‐based nanoparticles single‐atom Fe‐species) metal‐free (heteroatoms doping defects). Meanwhile, synergistic effects also discussed this with emphasis interaction among multiple sites. Although substantial endeavors devoted to develop efficient catalysts, some challenges remain. To facilitate further research toward applications, perspectives prospected aspects innovative synthesis methods, active‐sites modulation high‐resolution ex situ/in situ/operando characterization techniques, theoretical calculations, so on. may provide guideline for identifying developing high‐performance catalysts.

Язык: Английский

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Modified separators boost polysulfides adsorption-catalysis in lithium-sulfur batteries from Ni@Co hetero-nanocrystals into CNT-porous carbon dual frameworks

Journal of Colloid and Interface Science, Год журнала: 2023, Номер 652, С. 1417 - 1426

Опубликована: Авг. 29, 2023

Язык: Английский

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Surface reconstruction in amorphous CoFe-based hydroxides/crystalline phosphide heterostructure for accelerated saline water electrolysis

Journal of Colloid and Interface Science, Год журнала: 2024, Номер 659, С. 821 - 832

Опубликована: Янв. 10, 2024

Язык: Английский

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Structure–Activity Relationships in Oxygen Electrocatalysis

Advanced Materials, Год журнала: 2024, Номер unknown

Опубликована: Сен. 30, 2024

Abstract Oxygen electrocatalysis, as the pivotal circle of many green energy technologies, sets off a worldwide research boom in full swing, while its large kinetic obstacles require remarkable catalysts to break through. Here, based on summarizing reaction mechanisms and situ characterizations, structure–activity relationships oxygen electrocatalysts are emphatically overviewed, including influence geometric morphology chemical structures electrocatalytic performances. Subsequently, experimental/theoretical is combined with device applications comprehensively summarize cutting‐edge according various material categories. Finally, future challenges forecasted from perspective catalyst development applications, favoring researchers promote industrialization electrocatalysis at an early date.

Язык: Английский

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Recent advances in catalyst design, performance, and challenges of metal-heteroatom-co-doped biochar as peroxymonosulfate activator for environmental remediation

Environmental Research, Год журнала: 2024, Номер 252, С. 118919 - 118919

Опубликована: Апрель 16, 2024

Язык: Английский

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Destabilization of Single‐Atom Catalysts: Characterization, Mechanisms, and Regeneration Strategies

Advanced Materials, Год журнала: 2025, Номер unknown

Опубликована: Янв. 19, 2025

Abstract Numerous in situ characterization studies have focused on revealing the catalytic mechanisms of single‐atom catalysts (SACs), providing a theoretical basis for their rational design. Although research is relatively limited, stability SACs under long‐term operating conditions equally important and prerequisite real‐world energy applications, such as fuel cells water electrolyzers. Recently, there has been rise destabilization regeneration SACs; however, timely comprehensive summaries that provide catalysis community with valuable insights directions are still lacking. This review summarizes recent advances strategies SACs, specifically highlighting various state‐of‐the‐art techniques employed studies. The factors induce identified by discussing failure active sites, coordination environments, supports, reaction scenarios. Next, primary introduced, including redispersion, surface poison desorption, exposure subsurface sites. Additionally, advantages limitations both ex discussed. Finally, future proposed, aimed at constructing structure–stability relationships guiding design more stable SACs.

Язык: Английский

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Recent progress of in situ/operando characterization techniques for electrocatalytic energy conversion reaction

Chinese Chemical Letters, Год журнала: 2023, Номер 35(9), С. 109237 - 109237

Опубликована: Окт. 24, 2023

Язык: Английский

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