110 results match your criteria: "National Synchrotron Radiation Research Center (NSRRC)[Affiliation]"

LiZrF protective layer enabled high-voltage LiCoO positive electrode in sulfide all-solid-state batteries.

Nat Commun

January 2025

Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Fudan University, Shanghai, China.

The application of high-voltage positive electrode materials in sulfide all-solid-state lithium batteries is hindered by the limited oxidation potential of sulfide-based solid-state electrolytes (SSEs). Consequently, surface coating on positive electrode materials is widely applied to alleviate detrimental interfacial reactions. However, most coating layers also react with sulfide-based SSEs, generating electronic conductors and causing gradual interface degradation and capacity fading.

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Article Synopsis
  • - Buried-interface engineering plays a vital role in the production of perovskite solar cells (PSCs), especially in inverted PSCs (IPSCs), enhancing the deposition of perovskite materials by utilizing dewetting agents.
  • - The study reveals that using fluorene-based conjugated polyelectrolyte treatments creates unique dendrite-like patterns at the buried interface, which significantly alters the optical properties and mechanical behavior of the perovskite films, such as reducing Young's modulus and hardness.
  • - While these dendritic structures initially improve energy conversion efficiency in IPSCs, they negatively impact the long-term stability of the devices, highlighting the need for balanced strategies in buried-interface engineering.
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The traditional sulfur selenization process in CuZnSn(S,Se) (CZTSSe) solar cell fabrication often results in the creation of localized anion vacancies ( and ). These vacancies are considered harmful defects as they can trap carriers generated by light, leading to reduced solar cell efficiency. Moreover, concrete evidence has been lacking on the extent of the impact caused by these anion vacancies.

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Tailoring the d‑Band Center of High-Entropy Perovskite Oxide Nanotubes for Enhanced Nitrate Electroreduction.

Small

November 2024

Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi, 214122, China.

High-entropy perovskite oxides exhibit promising application prospects in the field of electrocatalysis, owing to their flexible elemental composition, plentiful active sites, and superior structural stability. Herein, high-entropy perovskite oxide nanotubes are prepared with La, Nd, Pr, Er, Eu at A-site by electrospinning as efficient electrocatalysts for nitrate reduction reaction (NORR). Electrochemical tests demonstrate that LaNdPrErEuCuO nanotubes (LNPEEC NTs) display outstanding NORR performance, achieving a NH Faraday efficiency (FE) of 100% at -0.

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Impacts of distorted local chemical coordination on electrochemical performance in hydrated vanadium pentoxide.

Nat Commun

October 2024

Interdisciplinary Materials Research Center, School of Materials Science and Engineering, Tongji University, Shanghai, 201804, China.

Modulating and elevating the operating voltage of a given cathode is a significant challenge to enhance the energy density of secondary batteries without sacrificing power output. The chemical coordination strongly influences the energy levels of d-orbitals of redox cations in cathode materials, which tie to their operating voltage. In contrast to concentrated studies on enhancing the specific capacity, in this study, we choose bi-layered hydrated vanadium pentoxide as the model to modulate the d-orbital energy levels through local chemical coordination manipulation, achieving a higher operating voltage in rechargeable aqueous zinc ion batteries.

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Designing hybrid transition metal phosphosulfide electrocatalysts is critical for the hydrogen evolution reaction (HER). We propose a novel approach by designing a hierarchical structure of cobalt phosphide (CoP) and nickel phosphide (NiP) nanoparticles topotactically developed on nickel sulfide (NiS) nanorods (CoNiP/NiS) a sulfuration-phosphorization strategy using conductive 3D nickel foam. Hierarchical heterostructured nanorods were achieved without the need for template removal steps or the assistance of surfactants.

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Observation of Enhanced Long-Range Ferromagnetic Order in B-Site Ordered Double Perovskite Oxide CdCrSbO.

Inorg Chem

October 2024

Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.

A B-site ordered double perovskite oxide CdCrSbO was synthesized under high-pressure and high-temperature conditions. The compound crystallizes to a monoclinic structure with a space group of 2/. The charge configuration is confirmed to be that of Cd/Cr/Sb.

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The solid electrolyte is anticipated to prevent lithium dendrite formation. However, preventing interface reactions and the development of undesirable lithium metal deposition during cycling are difficult and remain unresolved. Here, to comprehend these occurrences better, this study reports an alloy formation strategy for enhanced interface stability by incorporating antimony (Sb) in the lithium argyrodite solid electrolyte LiPSCl (LPSC-P) to form Li-Sb alloy.

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Substrate-Assisted Atomic Dispersion of Cobalt for Alkaline Water Electrolysis.

J Phys Chem Lett

September 2024

Electrochemical Technology Center, Department of Chemistry, University of Guelph, 50 Stone Road East, Guelph, ON N1G 2W1, Canada.

Atomically dispersed single-atom catalysts have recently attracted broad research interest due to their high atom efficiency and unique catalytic performance. In this study, atomic dispersion of cobalt is achieved using a chemical bath deposition method on a highly stable alkali titanate film (Ti/KTiO). These films were characterized using a variety of techniques, with atomic dispersion confirmed via grazing incidence X-ray absorption spectroscopy and ab initio modeling of single-atom systems.

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The efficacy and structural evolution of Mo-doped titania nanoparticles (MTNPs) as advanced photocatalysts for degrading methyl blue (MB) are investigated by X-ray absorption spectroscopy (XAS). The 3 wt % MTNP, characterized by uniform size and anatase structure, exhibits higher efficiency. The spectral analyses unveiled structural variations in the TiO octahedral structure and revealed an active site of the distorted square pyramidal structure symmetry (C).

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Metal oxide composites with graphene/graphene oxide have increasingly gained popularity in enhancing the photocatalytic degradation of several existing harmful dyes. Moreover, identifying the role of carbon networks and their interactions in composite formation would assist in the design and development of photocatalysts. In the present study, we investigated the role of carbon networks in improving photocatalytic properties.

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Charge Redistribution in High-Entropy Perovskite Oxide Porous Nanotubes Boosts Nitrate Electroreduction to Ammonia.

ACS Nano

July 2024

Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, China.

High-entropy perovskite oxides are promising materials in the field of electrocatalysis due to their advantages such as large spatial composition regulation, entropy effects, and tunable material properties. However, the preparation of high-entropy perovskite oxides with stable and controllable structures still remains challenging. Herein, we fabricated a series of high-entropy perovskite oxide porous nanotubes (PNTs) by electrospinning as efficient electrocatalysts for the nitrate reduction reaction (NORR).

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Enhanced electrocatalytic biomass oxidation at low voltage by Ni-O-Pd interfaces.

Nat Commun

July 2024

School of Environment and Energy, State Key Laboratory of Luminescent Materials and Devices, Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control, South China University of Technology, Guangzhou, China.

Article Synopsis
  • Challenges in efficiently converting biomass-based aldehydes and alcohols to acids limit their broader application; this study presents a solution with a new catalyst.
  • The Pd/Ni(OH) catalyst achieves nearly 100% selectivity in producing 2,5-furandicarboxylic acid from 5-hydroxymethylfurfural, yielding 97.3% at a voltage of 0.6 V under standard conditions.
  • The catalyst's effectiveness is enhanced by its unique Ni-O-Pd interfaces, which promote reaction steps, prevent nanoparticle clumping, and maintain stability over 200 hours of continuous use.
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Synergistic Bulk and Surface Engineering for Expeditious and Durable Reversible Protonic Ceramic Electrochemical Cells Air Electrode.

Adv Mater

August 2024

Department of Building and Real Estate, Research Institute for Sustainable Urban Development (RISUD) and Research Institute for Smart Energy (RISE), The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, 999077, China.

Reversible protonic ceramic electrochemical cells (R-PCECs) offer the potential for high-efficiency power generation and green hydrogen production at intermediate temperatures. However, the commercial viability of R-PCECs is hampered by the sluggish kinetics of the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) within conventional air electrodes operating at reduced temperatures. To address this challenge, this work introduces a novel approach based on the simultaneous optimization of bulk-phase metal-oxygen bonds and in-situ formation of a metal oxide nano-catalyst surface modification.

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Metal-organic frameworks (MOFs) are porous materials with potential in biomedical applications such as sensing, drug delivery, and radiosensitization. However, how to tune the properties of the MOFs for such applications remains challenging. Herein, we synthesized two MOFs, Zr-PEB and Hf-PEB.

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Crystal-Phase-Engineered High-Entropy Alloy Aerogels for Enhanced Ethylamine Electrosynthesis from Acetonitrile.

Adv Mater

June 2024

Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi, 214122, China.

Crystal-phase engineering that promotes the rearrangement of active atoms to form new structural frameworks achieves excellent result in the field of electrocatalysis and optimizes the performance of various electrochemical reactions. Herein, for the first time, it is found that the different components in metallic aerogels will affect the crystal-phase transformation, especially in high-entropy alloy aerogels (HEAAs), whose crystal-phase transformation during annealing is more difficult than medium-entropy alloy aerogels (MEAAs), but they still show better electrochemical performance. Specifically, PdPtCuCoNi HEAAs with the parent phase of face-centered cubic (FCC) PdCu possess excellent 89.

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The use of the "Holy Grail" lithium metal anode is pivotal to achieve superior energy density. However, the practice of a lithium metal anode faces practical challenges due to the thermodynamic instability of lithium metal and dendrite growth. Herein, an artificial stabilization of lithium metal was carried out via the thermal pyrolysis of the NHF salt, which generates HF(g) and NH(g).

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High-Pressure Synthesis of Semiconducting PbCuMnO with Near-Room-Temperature Ferrimagnetic Order.

Inorg Chem

April 2024

Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.

A transition-metal oxide of PbCuMnO was prepared at 1523 K and 10 GPa. An A-site-ordered quadruple perovskite structure with the space group 3̅ is assigned for this compound. Based on bond-valence-sum calculations and X-ray absorption spectroscopy, the charge combination is determined to be PbCuMnO.

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Due to its good mechanical properties and high ionic conductivity, the sulfide-type solid electrolyte (SE) can potentially realize all-solid-state batteries (ASSBs). Nevertheless, challenges, including limited electrochemical stability, insufficient solid-solid contact with the electrode, and reactivity with lithium, must be addressed. These challenges contribute to dendrite growth and electrolyte reduction.

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Article Synopsis
  • - The study examined the formation of C6H and C8H from various chemical reactions using advanced techniques like product translational and photoionization spectroscopy to analyze the resulting products.
  • - The researchers assessed the stability of the linear isomers C6H and C8H by comparing their photoionization efficiency curves to those of other known isomers, determining the ionization thresholds for both products.
  • - The findings, supported by quantum-chemical calculations, suggest that the reactions studied do not have significant energy barriers, indicating their relevance in the formation of interstellar C6H and C8H.
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Article Synopsis
  • The study investigated the production of CH, derived from reactions between C and CH or CH with itself, using advanced spectroscopy techniques.
  • It was found that the contributions of each reaction to CH production were evaluated at a ratio of 17:83, indicating that reactions involving CH are more significant.
  • The findings suggest that these reactions might play a role in forming CH in interstellar environments, contrasting with traditional models that focus mainly on C + CH reactions.
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Two-dimensional transition metal nitrides offer intriguing possibilities for achieving novel electronic and mechanical functionality owing to their distinctive and tunable bonding characteristics compared to other 2D materials. We demonstrate here the enabling effects of strong bonding on the morphology and functionality of 2D tungsten nitrides. The employed bottom-up synthesis experienced a unique substrate stabilization effect beyond van-der-Waals epitaxy that favored WN over lower metal nitrides.

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Al-Pt intermetallic compounds: HAXPES study.

Phys Chem Chem Phys

November 2023

Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Str. 40, 01187 Dresden, Germany.

Intermetallic compounds in the Al-Pt system were systematically studied hard X-ray photoelectron spectroscopy, focusing on the positions of Pt 4f and Al 2s core levels and valence band features. On one hand, with increasing Al content, the Pt 4f core levels shift towards higher binding energies (BE), revealing the influence of the atomic interactions (chemical bonding) on the electronic state of Pt. On the other hand, the charge transfer from Al to Pt increases with increasing Al content in Al-Pt compounds.

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  • * Analysis reveals that M-ZnO has more oxygen-related defects, while N-ZnO has a higher concentration of surface defects due to its smaller size; this affects their optical properties and potential applications.
  • * M-ZnO demonstrates superior photocatalytic activity for degrading rhodamine B dye, suggesting it is an efficient catalyst for environmental applications, supported by findings on defect states and energy band diagrams.
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Sulfide-based solid-state lithium-ion batteries (SSLIB) have attracted a lot of interest globally in the past few years for their high safety and high energy density over the traditional lithium-ion batteries. However, sulfide electrolytes (SEs) are moisture-sensitive which pose significant challenges in the material preparation and cell manufacturing. To the best of our knowledge, there is no tool available to probe the types and the strength of the basic sites in sulfide electrolytes, which is crucial for understanding the moisture stability of sulfide electrolytes.

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