Nitrogen vacancies cobalt nitride and its loading Pt electrocatalysts for efficient overall water splitting

Journal of Material Science and Technology, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 1, 2025

Language: Английский

---

Exploring the properties, types, and performance of atomic site catalysts in electrochemical hydrogen evolution reactions

Chemical Society Reviews, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 1, 2025

This review investigates atomic site catalysts (ASCs) for electrochemical hydrogen evolution reaction (HER), discussing their properties, types, performance, significance, activity, selectivity, stability, challenges, and future research directions.

Language: Английский

---

The Optimized Catalytic Performance of Single‐Atom Catalysts by Incorporating Atomic Clusters or Nanoparticles: In‐Depth Understanding on Their Synergisms

Advanced Energy Materials, Journal Year: 2023, Volume and Issue: 13(38)

Published: Aug. 7, 2023

Abstract The performance optimization of single‐atom catalysts (SACs) is important but remains challenging. Taking advantage accompanying in situ formation atomic clusters (ACs)/nanoparticles (NPs) during the preparation SACs can be a promising solution. coupled ACs/NPs and single atoms (SAs) highly efficient catalyzing various reactions (e.g., oxygen reduction reaction (ORR), hydrogen evolution (HER), CO 2 (CO RR), N oxidation (NOR), etc), showing superior activity, selectivity, stability. mechanisms mainly categorized as intensified SAs, SAs ACs/NPs, proceeding on both SAs. proposed may applicable to rationalize excellent consisting In end, existing issues further development directions are put forward. This review expected simultaneously contribute application in‐depth understanding catalysis (SAC).

Language: Английский

---

Boosting oxygen electrocatalytic performance of Cu atom by engineering the d-band center via secondary heteroatomic phosphorus modulation

Applied Catalysis B Environment and Energy, Journal Year: 2023, Volume and Issue: 338, P. 123043 - 123043

Published: June 29, 2023

Language: Английский

---

Dual Single-Atomic Co–Mn Sites in Metal–Organic-Framework-Derived N-Doped Nanoporous Carbon for Electrochemical Oxygen Reduction

ACS Nano, Journal Year: 2023, Volume and Issue: 17(19), P. 19155 - 19167

Published: Sept. 29, 2023

Synthesizing dual single-atom catalysts (DSACs) with atomically isolated metal pairs is a challenging task but can be an effective way to enhance the performance for electrochemical oxygen reduction reaction (ORR). Herein, well-defined DSACs of Co-Mn, stabilized in N-doped porous carbon polyhedra (named CoMn/NC), are synthesized using high-temperature pyrolysis Co/Mn-doped zeolitic imidazolate framework. The Co-Mn site CoMn/NC recognized by combining microscopic as well spectroscopic techniques. exhibited excellent ORR activities alkaline (E1/2 = 0.89 V) acidic 0.82 electrolytes long-term durability and enhanced methanol tolerance. Density functional theory (DFT) suggests that efficiently activating O-O bond via bridging adsorption, decisive 4e- process. Though sites favor O2 activation dissociative mechanism, stronger adsorption intermediates path degrades overall activity. Our DFT studies conclude on mainly occurs side-on following thermodynamically kinetically favorable associative mechanistic pathways lower overpotential barrier. performed excellently cathode proton exchange membrane (PEM) fuel cell rechargeable Zn-air battery high peak power densities 970 176 mW cm-2, respectively. This work provides guidelines rational design synthesis nonprecious enhancing activity robustness multifunctional robust electrocatalysts energy storage conversion devices.

Language: Английский

---

Ultrathin Co‐N‐C Layer Modified Pt–Co Intermetallic Nanoparticles Leading to a High‐Performance Electrocatalyst toward Oxygen Reduction and Methanol Oxidation

Small, Journal Year: 2023, Volume and Issue: 19(37)

Published: May 5, 2023

The development of low platinum-based alloy electrocatalysts is crucial to accelerate the commercialization fuel cells, yet remains a synthetic challenge and an incompatibility between activity stability. Herein, facile procedure fabricate high-performance composite that comprises Pt-Co intermetallic nanoparticles (IMNs) Co, N co-doped carbon (Co-N-C) electrocatalyst proposed. It prepared by direct annealing homemade black-supported Pt (Pt/KB) covered with Co-phenanthroline complex. During this process, most Co atoms in complex are alloyed form ordered IMNs, while some atomically dispersed doped framework superthin layer derived from phenanthroline, which coordinated Co-Nx moieties. Moreover, Co-N-C film obtained observed cover surface prevent dissolution agglomeration nanoparticles. catalyst exhibits high stability toward oxygen reduction reactions (ORR) methanol oxidation (MOR), delivering outstanding mass activities 1.96 2.92 A mgPt-1 for ORR MOR respectively, owing synergistic effect IMNs film. This study may provide promising strategy improve electrocatalytic performance Pt-based catalysts.

Language: Английский

---

Which is Best for ORR: Single Atoms, Nanoclusters, or Coexistence?

ACS Energy Letters, Journal Year: 2023, Volume and Issue: 9(1), P. 93 - 101

Published: Dec. 8, 2023

The commercialization of fuel cells necessitates achieving ultralow Pt loadings due to the scarcity Pt. Single atoms (SAs) have emerged as a potential solution enhance atomic utilization catalysts. Our density functional theory (DFT) calculations reveal that combining SAs with nanoclusters rather than using alone in catalysts leads optimized electronic structures. coexistence and significantly improves adsorption desorption behaviors oxygen-containing intermediates during oxygen reduction reaction (ORR). To experimentally validate this finding, we synthesized SAs, nanoclusters, their mixture. electrochemical performance these ORR is consistent DFT calculations. This study answers question, which best for ORR: single atoms, or coexistence?

Language: Английский

---

Probing the Roles of Indium Oxides on Copper Catalysts for Enhanced Selectivity during CO₂-to-CO Electrochemical Reduction

Nano Letters, Journal Year: 2023, Volume and Issue: 23(6), P. 2262 - 2268

Published: March 13, 2023

The electrochemical CO2 reduction reaction (CO2RR) provides an alternative protocol to producing industrial chemicals with renewable electricity sources, and the highly selective, durable, economic catalysts should expedite CO2RR applications. Here, we demonstrate a composite Cu-In2O3 catalyst in which trace amount of In2O3 decorated on Cu surface greatly improves selectivity stability for CO2-to-CO as compared counterparts (Cu or In2O3), realizing CO faradaic efficiency (FECO) 95% at -0.7 V (vs RHE) no obvious degradation within 7 h. In situ X-ray absorption spectroscopy reveals that undergoes redox preserves metallic state during process. Strong electronic interaction coupling occur Cu/In2O3 interface serves active site selective CO2RR. Theoretical calculation confirms roles preventing oxidation altering structure assist COOH* formation demote CO* adsorption interface.

Language: Английский

---

Dual‐Active‐Sites Single‐Atom Catalysts for Advanced Applications

Small, Journal Year: 2023, Volume and Issue: 19(42)

Published: June 15, 2023

Abstract Dual‐Active‐Sites Single‐Atom catalysts (DASs SACs) are not only the improvement of SACs but also expansion dual‐atom catalysts. The DASs contains dual active sites, one which is a single atomic site, and other site can be atom or type endowing with excellent catalytic performance wide range applications. categorized into seven types, including neighboring mono metallic SACs, bonded non‐bonded bridged asymmetric metal nonmetal combined space separated SACs. Based on above classification, general methods for preparation comprehensively described, especially their structural characteristics discussed in detail. Meanwhile, in‐depth assessments variety applications electrocatalysis, thermocatalysis photocatalysis provided, as well unique mechanism addressed. Moreover, prospects challenges related highlighted. authors believe great expectations this review will provide novel conceptual methodological perspectives exciting opportunities further development application

Language: Английский

---

Materials for electrocatalysts in proton exchange membrane fuel cell: A brief review

Frontiers in Energy Research, Journal Year: 2023, Volume and Issue: 11

Published: Feb. 14, 2023

Energy is a requisite factor for technological advancement and the economic development of any society. Currently, global energy demand supply largely rely on fossil fuels. The use fuels as source has caused severe environmental pollution warming. To salvage dire situation, research effort geared toward utilization clean, renewable sustainable sources hydrogen economy among most preferred choices. Hydrogen economy, which includes production, storage conversion gained wide consideration an ecofriendly future solution with fuel cell its device. Fuel cells, especially, proton exchange membrane category, present promising technology that converts directly into electricity great efficiency no hazardous emissions. Unfortunately, current generation cells faces some drawbacks prevent them from large-scale market adoption. These challenges include high costs durability concerns catalyst materials. main cost in platinum used electrodes, particularly at cathode where sluggish oxygen reduction reaction kinetics require loading precious metals. Many efforts are directed to reduce device by reducing or completely replacing metal using alternative low-cost materials “platinum-like” catalytic behaviour while maintaining power performance durability. Consequently, this review attempts highlight recent replace carbon support other cost-effective durable electrocatalysts. Overview such alloy-based (binary, ternary, quaternary high-entropy alloys), single atom metal-free electrocatalysts were discussed, areas still their infancy have many open questions need be answered gain insight intrinsic requirements will inform recommendation outlook selecting cell.

Language: Английский

---