Results in Chemistry, Год журнала: 2024, Номер unknown, С. 101831 - 101831
Опубликована: Окт. 1, 2024
Язык: Английский
Science Advances, Год журнала: 2024, Номер 10(23)
Опубликована: Июнь 5, 2024
Alloying has proven power to upgrade metallic electrocatalysts, while the traditional alloys encounter limitation for optimizing electronic structures of surface sites in a continuous manner. High-entropy (HEAs) overcome this by manageably tuning adsorption/desorption energies reaction intermediates. Recently, marriage nanotechnology and HEAs made considerable progresses renewable energy technologies, showing two important trends size diminishment multidimensionality. This review is dedicated summarizing recent advances that are rationally designed electrocatalysis. We first explain advantages as electrocatalysts from three aspects: high entropy, nanometer, multidimension. Then, several structural regulation methods proposed promote electrocatalysis HEAs, involving thermodynamically nonequilibrium synthesis, regulating (sub-)nanosize anisotropic morphologies, well engineering atomic ordering. The general relationship between electrocatalytic properties further discussed. Finally, we outline remaining challenges field, aiming inspire more sophisticated HEA-based nanocatalysts.
Язык: Английский
Процитировано
25
Catalysts, Год журнала: 2024, Номер 14(9), С. 569 - 569
Опубликована: Авг. 28, 2024
Proton exchange membrane fuel cells (PEMFCs) have been considered by many countries and enterprises because of their cleanness efficiency. However, due to high cost low platinum utilization rate, the commercialization process PEMFC is severely limited. The cathode catalyst layer (CCL) plays an important role in manipulating performance lifespan PEMFCs, which makes them one most significant research focuses this community. In CCL, intrinsic activity stability catalysts determine lifetime layer. paper, composition working principle are briefly introduced, focusing on Pt-based for oxygen reduction reactions (ORRs). progress past five years particularly reviewed, mainly concentrating development status emerging popular current field, including novel concepts like phase regulation (intermetallic alloys high-entropy alloys), interface engineering (coupled low-Pt/Pt-free catalysts), single-atom catalysts. Finally, future directions ORR summarized prospected.
Язык: Английский
Процитировано
5
Small Methods, Год журнала: 2025, Номер unknown
Опубликована: Апрель 15, 2025
Abstract Conventional alloys have long been limited by their simple compositions, which make it difficult to meet the requirements of modern catalysis applications. In contrast, high‐entropy (HEAs), characterized multi‐principal elements in near‐equimolar ratios, become a transformative paradigm materials science since inception 2004. The unique core effects HEAs, including effect, severe‐lattice distortion sluggish‐diffusion and cocktail endow them with superior catalytic properties activity, selectivity, durability. However, rapid advanced development comprehensive review applications is imperative foster deeper understanding. this review, capability commencing from entropy‐driven mechanism HEAs systematically explored. Then, are comprehensively analyzed diverse fields, energy conversion, chemical industries, environmental remediation, emphasizing remarkable capabilities Finally, pivotal challenges outlined synthesis methods, mechanistic elucidation, green manufacturing, propose future directions such as database establishment machine‐learning‐assisted design. By addressing knowledge gaps inspiring innovative strategies, aims accelerate translation into practical solutions for sustainable future.
Язык: Английский
Процитировано
0
Green Chemistry, Год журнала: 2024, Номер unknown
Опубликована: Янв. 1, 2024
Renewable energy sources are crucial for addressing the crisis and global warming, but their intermittent nature necessitates storage.
Язык: Английский
Процитировано
3
Journal of Electroanalytical Chemistry, Год журнала: 2025, Номер unknown, С. 119175 - 119175
Опубликована: Май 1, 2025
Язык: Английский
Процитировано
0
Journal of the American Chemical Society, Год журнала: 2025, Номер unknown
Опубликована: Май 23, 2025
Metal-nitrogen-carbon (M-N-C, M = Mn, Fe, Co, Ni, Cu, Zn, and Pt) dual-atom catalysts (DACs) show great potential for the oxygen reduction reaction (ORR) at cathode of proton exchange membrane fuel cells (PEMFCs). During catalytic reactions, multiple reactants intermediates interact with active sites, yet understanding their dynamic structural evolution under operating conditions remains challenging. In this study, we analyze 186 heteronuclear FeM-N-C DACs using ab initio thermodynamic phase diagrams find that OH-ligated structures become predominant higher applied potentials. This indicates activity is governed by electrochemically modified metal sites rather than bare structures. We further investigate mechanism these ligated reveal ORR limiting can be efficiently predicted from diagrams. Among studied, 29 were found to outperform Pt-based catalysts, FeCo-N-C demonstrating highest activity. Our computational predictions align well experimental observations, highlighting crucial role changes in enhancing electrocatalytic performance DACs.
Язык: Английский
Процитировано
0
Applied Organometallic Chemistry, Год журнала: 2024, Номер 38(11)
Опубликована: Авг. 10, 2024
ABSTRACT Fuel cell technologies constitute a clean, reliable, highly efficient, and eco‐friendly source of alternative energy generation. However, they still require reliable robust catalytic system showing comparative electrochemical activity to precious metal Pt with less cost. In this work, Mn@ZnO NPs were synthesized using hydrothermal‐assisted simple method. Several techniques including SEM, TGA, XRD used confirm the material synthesis. Electrochemical properties analyzed by linear sweep voltammetry, chronoamperometry, cyclic voltammetry. A higher ORR in terms mass current density was observed 133.9 mA/mg as compared Pt/C (96 mA/mg) Pd/C (67 under otherwise identical conditions. also exhibited excellent (1.913 mA cm −2 ), comparable (1.55 ). Chronoamperometry shows stability for up 800 s. Comparative studies conducted both acidic basic mediums, media.
Язык: Английский
Процитировано
2
ACS Applied Materials & Interfaces, Год журнала: 2024, Номер unknown
Опубликована: Ноя. 19, 2024
Platinum particle growth during long-term operations is one of the well-known bottlenecks offsetting performance and stability Pt-based electrocatalysts in polymer electrolyte membrane (PEM) fuel cells PEM water electrolyzers. In this research, addition certain ceramic nanoparticulate additives to catalyst ink was evaluated as a means improving electrochemical carbon-supported platinum (Pt/C) electrocatalyst gas diffusion electrodes (GDEs) an accelerated stress test (AST). GDEs prepared using three (TiN, ATO, TiO
Язык: Английский
Процитировано
2
Sustainability, Год журнала: 2024, Номер 17(1), С. 198 - 198
Опубликована: Дек. 30, 2024
In this study, the performance and durability of polymer electrolyte membrane fuel cells (PEMFCs) were improved using a Pt-Pr6O11 composite electrode fabricated through co-sputtering technique. Platinum (Pt), widely used as catalyst material in PEMFCs, often faces stability issues under various electrical load conditions. These require greater efforts to enhance PEMFC durability. Various approaches, including replacement supports with electrically stable materials (such metal oxides) or adoption core-shell alloy structures stabilize Pt, have been attempted. research, thin film combining Pr6O11 Pt was fabricated. Pr6O11, lanthanide oxide, enhances oxygen reduction reaction (ORR) strong interactions its multi-valence state contributes Scanning electron microscopy (SEM) X-ray photoelectron spectroscopy (XPS) employed analyze composition, morphology, chemical characteristics electrodes. I-V curves electrochemical impedance spectroscopies (EIS) measured evaluate properties cells. A cyclic voltammetry (CV) test conducted calculate surface area cell. As result, incorporation pristine cell by 7.6% increased after degradation testing 121% compared Pt-only cases. This demonstrates effectiveness enhancing both initial PEMFCs.
Язык: Английский
Процитировано
1
C – Journal of Carbon Research, Год журнала: 2024, Номер 10(2), С. 47 - 47
Опубликована: Май 17, 2024
Glucose-derived carbon hybrids were synthesized by hydrothermal treatment in the presence of oxidized nanotubes. Additionally, iron and nitrogen functionalities incorporated into structure using different methodologies. The introduction a single step under H2 atmosphere favored formation quaternary nitrogen, whereas incorporation an N2 after doping with mainly produced pyridinic nitrogen. samples characterized scanning electron microscopy, X-ray spectroscopy, adsorption isotherms, inductively coupled plasma optical emission spectrometry, Raman spectroscopy. carbons increases onset potential toward oxygen reduction KOH 0.1 mol L−1 130 mV (0.83 V), comparison to carbonized glucose, reaction mechanism shifts closer direct pathway HO2− decreases 25% (3.5 electrons). rate also increased as observed decrease Tafel slope value from 117 61 dec−1. Furthermore, enhanced short-term performance prepared electrocatalysts, which may be due higher relative amount
Язык: Английский
Процитировано
0