Chemical Science, Год журнала: 2024, Номер unknown
Опубликована: Дек. 27, 2024
This review provides an overview of the advances in high entropy spinel oxides diverse catalytic reactions and highlights intrinsic structure–property–performance relationships.
Язык: Английский
Small, Год журнала: 2025, Номер unknown
Опубликована: Янв. 29, 2025
Abstract The hydrogen spillover phenomenon provides an expeditious reaction pathway via transfer from a strong H adsorption site to weak site, enabling cost‐efficient evolution (HER) analogous platinum with moderate energy. Here, high‐entropy oxychalcogenide (HEOC) comprising Co, Ni, Mo, W, O, Se, and Te is prepared by two‐step electrochemical deposition for spillover‐enhanced HER in acidic alkaline water electrolysis. anodic–cathodic reversal current enables the co‐deposition of cations aliovalent anions, facilitating glass structure multiple active sites spillover. HEOC exhibits low overpotentials 52 57 mV obtain density 10 mA cm −2 media, respectively, long‐term stability 500 h. analytical approaches elucidate toward Mo/W−O both acid HERs. Meanwhile, other act as or dissociation‐derived hydroxide sites, showing accommodable behavior media. practically high 1 A at cell voltages 1.78 1.89 V 100 h proton anion exchange membrane electrolyzers, respectively.
Язык: Английский
Процитировано
2
ACS Nano, Год журнала: 2025, Номер unknown
Опубликована: Фев. 26, 2025
The growth of inorganic shells on nanocrystal seeds to form core@shell nanoparticles is well-known enhance and improve properties performance, therefore foundational many applications. High entropy alloys, which contain five or more metals in near-equal amounts, are emerging as important materials due their synergistic properties. Integrating high alloys into the has potential combine expand benefits both. However, compositional complexity complicates shell because competing reactions byproducts that possible. Here, we report a synthetic protocol for growing alloy metal nanoparticle seeds, along with mechanistic insights from time-point studies define guidelines controlling composition, thickness, modes. By studying NiPdPtRhIr, SnPdPtRhIr, SnNiPdPtIr Au NiFePdRhIr both Pt find seed modifies reaction pathways accelerates formation compared when they synthesized directly absence seed. We also identify produce freestanding multimetallic particles instead desired shells, well evidence galvanic exchange ripening processes contribute growth. Based these insights, compiled roadmap design rules was then applied synthesis additional including SnNiFeRhIr SnNiFeCoPd, tolerance relative what can be achieved through direct synthesis.
Язык: Английский
Процитировано
1
Nature Synthesis, Год журнала: 2024, Номер unknown
Опубликована: Дек. 3, 2024
Язык: Английский
Процитировано
6
ACS Applied Energy Materials, Год журнала: 2024, Номер 7(21), С. 9625 - 9633
Опубликована: Окт. 23, 2024
Currently, ammonia borane (AB, NH3BH3) hydrolysis is considered an available tactic for hydrogen evolution under ambient conditions, which includes many complex reaction steps, such as the activation and adsorption of AB water molecules on catalyst. Therefore, exploiting high-performance catalysts with multiple active sites to match multistep catalytic processes in a critical urgent task but tough challenge. Herein, we propose synthesis scheme high-entropy alloy (HEA) catalyst liberation from hydrolysis. The FeCoNiMnRu HEA face-centered cubic (fcc) phase was synthesized by polymer fiber nanoreactor method using low-cost transition metals Co, Fe, Mn, Ni basic elements combined precious metal Ru, facilitates electron transfer enhances synergistic interaction between these elements, hence enhancing activity toward release hydrogen. For instance, as-synthesized Fe23Co27Ni27Mn12Ru11 shows superior catalyzing apparent energy (Ea) 42.3 kJ·mol–1 turnover frequency (TOF) 55.3 molH2·molRu–1·min–1 at 298 K. This work affords facile approach high-efficiency produce
Язык: Английский
Процитировано
4
Advanced Materials, Год журнала: 2025, Номер unknown
Опубликована: Март 4, 2025
The unique hydrogen adsorption characteristics of negatively charged platinum play a crucial role in enhancing the electrocatalytic evolution reaction. However, atomically dispersed Pt atoms are typically anchored to support through non-metallic atom bonds, resulting high oxidation state. Here, oxygen-deficient NiFe-LDH. Electron transfer between and NiFe-LDH occurs primarily Pt─Ni bonds rather than conventional Pt─O bonds. Oxygen vacancies promote additional electron from Ni Pt, thereby reducing valence state adsorption. Meanwhile, elevated increases catalyst's hydrophilicity reduces energy barrier for hydrolysis dissociation. This catalyst demonstrates remarkably low overpotentials 4 9 mV at 10 mA cm-2 1 m KOH KPi, respectively. Additionally, its mass activity is 51.5 23.7 times higher that Pt/C, study presents novel strategy performance rational design coordination environments electronic structures supported metal catalysts.
Язык: Английский
Процитировано
0
ACS Nano, Год журнала: 2025, Номер unknown
Опубликована: Март 26, 2025
Multielemental alloy (MEA) nanomaterials, such as medium and high entropy alloys, display promising catalytic performance in a range of chemical reactions due to their multicomponent structural configurations. These complex arrangements can be influenced by several factors, mechanical stress, irradiation, temperatures, which impact the MEAs various applications. Here, we investigated effect temperatures on MEA nanoparticles composed noble transition metals (quaternary PtPdFeCo) at atomic scale found material undergoes series phase transitions between solid solution intermetallic phases elevated ranging from room temperature 1073 K. In contrast, binary PtFe nanoalloy displays one-way these temperatures. Our findings, rationalized density functional theory (DFT) studies, demonstrate how varied migration energies elements govern differences bonding elemental pairs influence Gibbs free energy change (ΔG), dictates solid-solution transition. Overall, this work provides better guidance design, development, usage nano-MEAs for high-temperature-based
Язык: Английский
Процитировано
0
EnergyChem, Год журнала: 2025, Номер unknown, С. 100158 - 100158
Опубликована: Апрель 1, 2025
Язык: Английский
Процитировано
0
Advanced Science, Год журнала: 2025, Номер unknown
Опубликована: Апрель 26, 2025
Abstract Development of active and cost‐effective electrocatalysts to substitute platinum‐based catalysts in alkaline hydrogen evolution reactions (HERs) remains a challenge. The synergistic effect between different elements alloy can regulate electronic structure thereby provide an abundance catalytic sites for reactions. Thus, are suitable candidates future energy applications. Conventional methods enhancing the performance have mainly focused on element composition thus often neglected examine catalyst design. In this paper, ruthenium–manganese–niobium (Ru 62 Mn12Nb 21 O 5 ) is reported with supra‐nanocrystalline dual‐phase that fabricated through combinatorial magnetron co‐sputtering at ambient temperatures. induced crystal–crystal heterostructure Ru Mn 12 Nb reduced system energy, achieving balance stability activity. exhibited excellent HER performance, as demonstrated by low overpotential (18 mV 10 mA cm −2 robust (300 h 1.2 A ). Moreover, oxygen‐rich interfaces enhanced charge transfer kinetics water dissociation well optimized adsorption/desorption processes, boosting performance. its nanocrystalline structure, which represents new structural design sustainable development.
Язык: Английский
Процитировано
0
Deleted Journal, Год журнала: 2025, Номер unknown
Опубликована: Апрель 29, 2025
Abstract The stability of a nanoparticle catalyst during electrochemical reaction is crucial for its application. Despite increasing interest in multi-metallic alloy nanoparticles, such as high-entropy alloys (HEAs), electrocatalysis and emerging models their catalytic activity, there limited work on frameworks that can predict the metastability these under conditions, including against surface dissolution. Incorporating multi-objective optimization would advance HEAs discovery platform. To address knowledge gap stability, we propose methodology simulating dissolution n-element nanoparticles comprised density functional theory machine-learning regression to calculate potentials atoms. We demonstrate Ag–Au–Cu–Ir–Pd–Pt–Rh–Ru HEA system with conditions oxygen reduction reaction. investigated trends through compositional grid search octo-metallic composition space, uncovering two alloying strategies increase dissolution: Alloying noble metal or high relative energy. In simulations, stabilization ensues from forming protective layer, consequently, persistent alloyed results core–shell structures. model enables tracing evolution dissolved dissolution, paths revealing unretainable compositions. Graphical
Язык: Английский
Процитировано
0
ACS Nanoscience Au, Год журнала: 2025, Номер unknown
Опубликована: Апрель 30, 2025
Язык: Английский
Процитировано
0