Ni₃N–CeO₂ Heterostructure Bifunctional Catalysts for Electrochemical Water Splitting

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(47)

Published: Sept. 3, 2023

Abstract Developing low‐cost and high‐efficient bifunctional catalysts for hydrogen evolution reaction (HER) oxygen (OER) is greatly significant water electrolysis. Here, Ni 3 N‐CeO 2 /NF heterostructure synthesized on the nickel foam, it exhibits excellent HER OER performance. As a result, electrolyzer based catalyst only needs 1.515 V@10 mA cm −2 , significantly better than that of Pt/C||IrO catalysts. In situ characterizations unveil CeO plays completely different roles in processes. infrared spectroscopy density functional theory calculations indicate introduction can optimizes structure interface water, synergistic effect N improve activity significantly, while Raman spectra reveal accelerates reconstruction O V (oxygen vacancy)‐rich NiOOH boosting OER. This study clearly unlocks catalytic mechanisms splitting, which provides useful guidance designing high‐performance splitting.

Language: Английский

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Transition metal (Fe, Co, Mn, Cu) containing nitrogen-doped porous carbon as efficient oxygen reduction electrocatalysts for anion exchange membrane fuel cells

Chemical Engineering Journal, Journal Year: 2023, Volume and Issue: 458, P. 141468 - 141468

Published: Jan. 16, 2023

Language: Английский

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Structural engineering of atomic catalysts for electrocatalysis

Chemical Science, Journal Year: 2024, Volume and Issue: 15(14), P. 5082 - 5112

Published: Jan. 1, 2024

This review systematically introduces how to regulate the electronic structure and geometric configuration of atomic catalysts achieve high-efficiency electrocatalysis performances by analyzing detailed electrocatalytic applications mechanisms.

Language: Английский

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Engineering the electronic structure of isolated manganese sites to improve the oxygen reduction, Zn-air battery and fuel cell performances

Applied Catalysis B Environment and Energy, Journal Year: 2023, Volume and Issue: 337, P. 122966 - 122966

Published: June 7, 2023

Language: Английский

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Synergistic cooperation between atomically dispersed Zn and Fe on porous nitrogen-doped carbon for boosting oxygen reduction reaction

Applied Catalysis B Environment and Energy, Journal Year: 2023, Volume and Issue: 335, P. 122875 - 122875

Published: May 13, 2023

Language: 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, Journal Year: 2023, Volume and Issue: 33(26)

Published: March 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.

Language: Английский

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Recent Advances in Non‐Precious Metal Single‐Atom Electrocatalysts for Oxygen Reduction Reaction in Low‐Temperature Polymer‐Electrolyte Fuel Cells

ChemCatChem, Journal Year: 2023, Volume and Issue: 15(22)

Published: Oct. 9, 2023

Abstract Fuel cells have emerged as a promising clean electrochemical energy technology with great potential in various sectors, including transportation and power generation. However, the high cost scarcity of noble metals currently used to synthesise electrocatalysts for low‐temperature fuel has hindered their widespread commercialisation. In recent decades, development non‐precious metal cathodic oxygen reduction reaction (ORR) gained significant attention. Among those, atomically dispersed active sites, referred single‐atom catalysts (SACs), are gaining more interest. Nanocarbon materials containing single transition atoms coordinated nitrogen ORR both acidic alkaline conditions thus promise be utilised cathode cells. This review article provides an overview advancements utilisation metal‐based SACs proton exchange membrane (PEMFCs) anion (AEMFCs). We highlight main strategies synthetic approaches tailoring properties enhance activity durability. Based on already achieved results, it is evident that indeed could suitable

Language: Английский

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Amorphous/Crystalline Rh(OH)₃/CoP Heterostructure with Hydrophilicity/ Aerophobicity Feature for All‐pH Hydrogen Evolution Reactions

Advanced Energy Materials, Journal Year: 2023, Volume and Issue: 13(44)

Published: Oct. 3, 2023

Abstract Interface engineering shows distinct advantages in the electrocatalytic hydrogen evolution reaction (HER) due to unique structures that can be realized. The interfaces formed by amorphous materials often exhibit special properties are beneficial for HER. Herein, an amorphous/crystalline Rh(OH) 3 /CoP heterostructure is constructed, which exhibits outstanding HER performance all‐pH range. It only needs overpotentials of 13, 12, and 25 mV drive a current density 10 mA cm −2 alkaline, acidic, neutral media, respectively, ranks as one best electrocatalysts reported recently. activities range attributed /CoP, possesses hydrophilic/aerophobic features thataccelerate mass transfer, provide abundant exposed active sites appropriate defects. Importantly, attenuation mechanism catalyst also revealed, i.e., formation Rh aggregations leads poor contact efficacy loss interface In short, this work provides new idea using design electrocatalysts, not HER, but oxygen reduction reactions.

Language: Английский

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Electronic structure regulation of the Fe-based single-atom catalysts for oxygen electrocatalysis

Nano Energy, Journal Year: 2024, Volume and Issue: 121, P. 109268 - 109268

Published: Jan. 9, 2024

Language: Английский

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Efficient Proton-exchange Membrane Fuel Cell Performance of Atomic Fe Sites via p–d Hybridization with Al Dopants

Journal of the American Chemical Society, Journal Year: 2024, Volume and Issue: 146(18), P. 12636 - 12644

Published: April 27, 2024

Orbital hybridization to regulate the electronic structures and surface chemisorption properties of transition metals is great importance for boosting oxygen reduction reaction (ORR) in proton-exchange membrane fuel cells (PEMFCs). Herein, we developed a core–shell rambutan-like nanocarbon catalyst (FeAl-RNC) with atomically dispersed Fe–Al atom pairs from metal–organic framework (MOF) material. Experimental theoretical results demonstrate that strong p–d orbital between Al Fe an asymmetric electron distribution moderate adsorption strength intermediates, rendering enhanced intrinsic ORR activity. Additionally, structure FeAl-RNC abundant micropores macropores can enhance density active sites, stability, transport pathways PEMFC. The FeAl-RNC-based PEMFC achieves excellent activity (68.4 mA cm–2 at 0.9 V), high peak power (1.05 W cm–2), good stability only 7% current loss after 100 h 0.7 V under H2–O2 condition.

Language: Английский

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