Journal of Colloid and Interface Science, Journal Year: 2024, Volume and Issue: unknown
Published: Dec. 1, 2024
Language: Английский
JACS Au, Journal Year: 2025, Volume and Issue: unknown
Published: March 30, 2025
Proton exchange membrane fuel cells (PEMFCs) are emerging as a key technology in the transition to hydrogen-based energy systems, particularly for heavy-duty vehicles (HDVs) that face operational challenges, such frequent startup-shutdown cycles and starvation. However, widespread adoption of PEMFCs has been limited by their durability long-term performance issues, which crucial applications. This Perspective focuses on recent advancements PEMFC catalysts supports, with an emphasis strategies enhance durability. We introduce Pt-based intermetallic catalysts, including Pt metal (TM) alloys, offer improved stability activity through regular atomic arrangements strengthened metal-support interactions. Hybrid combining M-N-C (M = Fe, Co) have shown promise boosting enhancing catalytic while reducing platinum content. Moreover, stringent conditions must be met meet HDV requirements. Consequently, alternative support materials, oxides graphitized carbons, introduced both corrosion resistance electrical conductivity, thereby addressing limitations conventional carbon supports. Structural innovations material essential optimizing supports achieve performance. provides comprehensive overview developments catalyst design, offering insights into current challenges future directions achieving durable cost-effective PEMFCs.
Language: Английский
Citations
0
Industrial & Engineering Chemistry Research, Journal Year: 2025, Volume and Issue: unknown
Published: April 8, 2025
Language: Английский
Citations
0
Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown
Published: April 8, 2025
Abstract Durable electrocatalysts and optimal ionomer distribution in cathode catalyst layer (CCL) are crucial for the efficiency lifetime of proton exchange membrane fuel cells (PEMFCs), especially at high currents. This work presents a 1D package‐integrated platinum (Pt) designed to optimize mass boost cathodic oxygen reduction reaction (ORR). The Pt not only enhances active site utilization, activity, stability alloys but also optimizes coverage transport within CCL. It shows superior performance with activity 1.33 A mg −1 12 mV decay half‐wave potential after 30 000 cycles. Additionally, it delivers impressive catalytic (320 mA cm −2 0.8 V), polarization (0.632 V 2000 ), low resistance (0.03 s ) hydrogen‐air cells. robust anti‐ionomer interference capability is great significance designing efficient long‐lasting PEMFC cathodes.
Language: Английский
Citations
0
Ionics, Journal Year: 2025, Volume and Issue: unknown
Published: April 23, 2025
Language: Английский
Citations
0
Angewandte Chemie, Journal Year: 2025, Volume and Issue: unknown
Published: Jan. 21, 2025
Abstract Iron‐nitrogen‐carbon (Fe−N−C) single‐atom catalyst is the most promising alternative to platinum for proton‐exchange membrane fuel cells (PEMFCs), however its high performance cannot be maintained a long enough time in device operation. The construction of new Fe coordination environment that completely different from square‐planar Fe−N 4 configuration classic Fe−N−C expected break current stability limits Pt‐free catalysts, which remains unexplored. Here, we report, first time, conversion FeN x Se y cluster catalyst, where active sites are three‐dimensionally (3D) co‐coordinated by N and atoms. Due this unique configuration, exhibits much better 4e − ORR activity selectivity than state‐of‐the‐art catalyst. Specifically, yields hydrogen peroxide (H 2 O ) ⋅OH radicals on only one‐quarter one‐third counterpart, respectively. Therefore, outstanding cyclic stability, losing 10 mV half‐wave potential E 1/2 after 10,000 cycles, smaller (56 mV), representing stable catalysts ever reported PEMFCs. More significantly, 3D co‐coordination structure effectively inhibits demetallization presence H . As result, based PEMFC shows excellent durability, with density attenuation significantly lower accelerated durability testing. Our work provides guidance development next‐generation
Language: Английский
Citations
0
Applied Catalysis B Environment and Energy, Journal Year: 2025, Volume and Issue: 367, P. 125116 - 125116
Published: Feb. 2, 2025
Language: Английский
Citations
0
Advanced Materials, Journal Year: 2025, Volume and Issue: unknown
Published: May 2, 2025
Abstract Carbon‐supported Pt‐based catalysts in fuel cells often suffer from sulfonate poisoning, reducing Pt utilization and activity. Herein, a straightforward strategy is developed for synthesizing porous PtCoV nanoalloy embedded within the structures of carbon nanofibers. Incorporation vanadium (V) atoms into PtCo alloy optimizes oxygen binding energy sites, while heightening dissolution barrier both Co atoms, leading to significantly enhanced intrinsic activity durability catalyst. By encapsulating nanoalloys nanofibers, non‐contact Pt‐ionomer interface created mitigate poisoning effect groups promoting permeation allowing proton transfer. This rational architecture liberates additional active evolved nanostructure extends its exposed surface area, thereby boosting catalytic layer overall cell performance. The optimized catalyst demonstrates an exceptional peak power density 29.0 kW g −1 initial mass 0.69 A mg , which exceeds U.S. Department Energy 2025 targets. study provides promising avenue developing highly durable low‐Pt electrocatalysts applications.
Language: Английский
Citations
0
Advanced Materials, Journal Year: 2025, Volume and Issue: unknown
Published: May 6, 2025
Abstract High‐active nonplatinum group metal oxygen reduction reaction (ORR) catalysts have great potential to improve fuel cell and metal–air battery performance due their efficiency cost‐effectiveness. However, a fundamental understanding of size‐dependent structure–performance relationships remain elusive. Here mesoporous‐dominant carbon nanoreactor with dimensions in the range 15–43 nm edge‐rich defective atomic Zn sites is designed. The crystal size pore diameter this nanoreactors can be precisely adjusted enable tunable mass diffusion pathways porosities. Importantly, hydrophobic nature 25 maximizes nonkinetic advantages active site exposure rapid O 2 transfer at triple‐phase interface. developed Zn‐N‐P/NPC delivers outstanding alkaline acidic ORR half‐wave potentials 0.92 0.80 V, respectively, as well excellent zinc–air charge/discharge over 400 h under 20 mA cm −2 . X‐ray absorption spectroscopy theoretical calculations indicate that enhanced catalytic activity stems from introduction P atoms edge defects effectively exciting localized electronic asymmetric distribution species. findings provide new perspectives on effect porous supports for development efficient cathodes multifunctionality.
Language: Английский
Citations
0
Journal of the American Chemical Society, Journal Year: 2024, Volume and Issue: unknown
Published: Dec. 10, 2024
Understanding the structure evolution of nanoalloys under reaction conditions is vital to design active and durable catalysts. Herein, we report an operando measurement dynamic lattice strains dual-noble-metal alloyed with earth-abundant metal as a model electrocatalyst in working proton-exchange membrane fuel cell using synchrotron high-energy X-ray diffraction coupled pair distribution function analysis. The results reveal interfacial reaction-triggered oscillatory strain alloy nanoparticles upon surface dealloying. Analysis apparent irregularity terms frequency amplitude time-frequency domain transformation theoretical calculation reveals its origin from atom vacancy diffusion pathway facilitate realloying This process, partial oxidation, constitutes key factor for nanoalloy's durability electrocatalytic oxygen reduction condition, which serves new guiding principle engineering or self-healable electrocatalysts sustainable energy conversion.
Language: Английский
Citations
3
Advanced Functional Materials, Journal Year: 2024, Volume and Issue: unknown
Published: Nov. 4, 2024
Abstract Efficient, durable, and economical oxygen reduction catalysts are key for practical applications such as fuel cells metal–air batteries. Single atom (SACs) have attracted sustained widespread attention owing to their unique electronic properties exceptional atomic utilization, positioning them promising electrocatalysts in energy conversion storage. However, the symmetric charge distribution of metal site M‐N 4 configuration SACs is not conducive electron transfer transport electrocatalytic reactions, resulting a low adsorption reaction (ORR) related species (*OH, *O, *OOH), which severely limits intrinsic activity electrocatalysts. To overcome this limitation improve durability, heteroatom doping can effectively modulate local coordination environment (LCE) atom, including coordinating atoms, shells number. These modifications significantly improved performance carbon supported with ORR. Based on this, thorough summary major progress made recent years adjusting LCE through heteroatoms provided perspective future development offered here.
Language: Английский
Citations
2