Electrocatalytic nitrate-to-ammonia conversion on CoO/CuO nanoarrays using Zn–nitrate batteries

Nanoscale, Год журнала: 2023, Номер 15(48), С. 19577 - 19585

Опубликована: Янв. 1, 2023

Zn-NO3- batteries can generate electricity while producing NH3 in an environmentally friendly manner, making them a very promising device. However, the conversion of NO3- to involves proton-assisted 8-electron (8e-) transfer process with high kinetic barrier, requiring high-performance catalysts realize potential applications this technology. Herein, we propose heterostructured CoO/CuO nanoarray electrocatalyst prepared on copper foam (CoO/CuO-NA/CF) that electrocatalytically and efficiently convert at low achieves maximum yield 296.9 μmol h-1 cm-2 Faraday efficiency (FE) 92.9% -0.2 V vs. reversible hydrogen electrode (RHE). Impressively, battery based monolithic CoO/CuO-NA/CF delivers 60.3 cm-2, FENH3 82.0%, power density 4.3 mW cm-2. This study provides paradigm for catalyst preparation energy-efficient production simultaneously generating electrical energy.

Язык: Английский

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Electronic Spin Alignment within Homologous NiS₂/NiSe₂ Heterostructures to Promote Sulfur Redox Kinetics in Lithium‐Sulfur Batteries

Advanced Materials, Год журнала: 2024, Номер 36(25)

Опубликована: Апрель 3, 2024

Abstract The catalytic activation of the Li‐S reaction is fundamental to maximize capacity and stability batteries (LSBs). Current research on catalysts mainly focuses optimizing energy levels promote adsorption conversion, while frequently overlooking electronic spin state influence charge transfer orbital interactions. Here, hollow NiS 2 /NiSe heterostructures encapsulated in a nitrogen‐doped carbon matrix (NiS @NC) are synthesized used as additive sulfur cathodes. heterostructure promotes splitting 3d orbital, driving Ni 3+ transformation from low high spin. This configuration raises level activates state. accelerates optimizes energy, lowering barrier polysulfides conversion. Benefiting these characteristics, LSBs based @NC/S cathodes exhibit initial (1458 mAh·g⁻ 1 at 0.1C), excellent rate capability (572 5C), stable cycling with an average decay only 0.025% per cycle 1C during 500 cycles. Even loadings (6.2 mg·cm⁻ ), capacities 1173 (7.27 mAh·cm⁻ ) measured 0.1C, 1058 retained after 300

Язык: Английский

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Significantly enhanced ion‐migration and sodium‐storage capability derived by strongly coupled dual interfacial engineering in heterogeneous bimetallic sulfides with densified carbon matrix

SusMat, Год журнала: 2024, Номер 4(3)

Опубликована: Апрель 28, 2024

Abstract The development of highly efficient sodium‐ion batteries depends critically on the successful exploitation advanced anode hosts that is capable overcoming sluggish reaction kinetics while also withstanding severe structural deformation triggered by large radius Na + ‐insertion. Herein, a hierarchically hybrid material with hetero‐Co 3 S 4 /NiS hollow nanosphere packaged into densified N‐doped carbon matrix (Co /NiS@N‐C) was designed and fabricated utilizing CoNi‐glycerate as self‐sacrifice template, making utmost synergistic effect strong electric field rich active‐sites together outer‐carbon scaffolds remarkable electronic conductivity robust mechanical toughness. As anticipated, as‐fabricated Co /NiS@N‐C affords specific capacity, prolonged cycle lifespan up to 2 400 cycles an only 0.05% fading each at 20.0 A g −1 , excellent rate feature (354.9 mAh 30.0 ), one best performances for most existing /NiS‐based anodes. Ex situ characterizations in tandem theoretical analysis demonstrate reversible insertion‐conversion mechanism initially proceeding de‐/intercalation superior heterogeneous interfacial behavior ‐adsorption ability. Further, full cell capacitor based exhibit impressive electrochemical characteristics cycling performance capability, showcasing its outstanding feasibility toward practical use.

Язык: Английский

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Catalytic chemistry inspired hollow carbon nanofibers loaded with NiS/Ni as high-performance and safe Li+ reservoir

Journal of Colloid and Interface Science, Год журнала: 2024, Номер 664, С. 156 - 167

Опубликована: Март 1, 2024

Язык: Английский

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Surface Patterning of Metal Zinc Electrode with an In-Region Zincophilic Interface for High-Rate and Long-Cycle-Life Zinc Metal Anode

Nano-Micro Letters, Год журнала: 2024, Номер 16(1)

Опубликована: Фев. 9, 2024

Abstract The undesirable dendrite growth induced by non-planar zinc (Zn) deposition and low Coulombic efficiency resulting from severe side reactions have been long-standing challenges for metallic Zn anodes substantially impede the practical application of rechargeable aqueous metal batteries (ZMBs). Herein, we present a strategy achieving high-rate long-cycle-life anode patterning foil surfaces endowing Zn-Indium (Zn-In) interface in microchannels. accumulation electrons microchannel zincophilicity Zn-In promote preferential heteroepitaxial region enhance tolerance electrode at high current densities. Meanwhile, electron aggregation accelerates dissolution non-(002) plane atoms on array surface, thereby directing subsequent homoepitaxial surface. Consequently, planar dendrite-free long-term cycling stability are achieved (5,050 h 10.0 mA cm −2 27,000 cycles 20.0 ). Furthermore, Zn/I 2 full cell assembled pairing with such an can maintain good 3,500 5.0 C, demonstrating potential as-prepared ZnIn high-performance ZMBs.

Язык: Английский

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High‐Energy‐Density Cathode Achieved via the Activation of a Three‐Electron Reaction in Sodium Manganese Vanadium Phosphate for Sodium‐Ion Batteries

Small, Год журнала: 2023, Номер 19(50)

Опубликована: Авг. 24, 2023

Abstract Sodium superionic conductor (NASICON)‐type Na 3 V 2 (PO 4 ) has attracted considerable interest owing to its stable three‐dimensional framework and high operating voltage; however, it suffers from a low‐energy density due the poor intrinsic electronic conductivity limited redox couples. Herein, partial substitution of Mn 3+ for in is proposed activate 4+ /V 5+ couple boosting energy cathodes (Na 2‒ x ). With introduction into , band gap significantly reduced by 1.406 eV thus greatly enhanced. The successive conversions four oxidation states (V 2+ are also successfully achieved voltage window 1.4–4.0 V, corresponding three electrons involved reversible reaction. Consequently, cathode with = 0.5 exhibits discharge capacity 170.9 mAh g −1 at C an ultrahigh 577 Wh kg . Ex‐situ x‐ray diffraction (XRD) analysis reveals that sodium‐storage mechanism Mn‐doped consists single‐phase bi‐phase reactions. This work deepens understanding activation three‐electron reaction NASICON‐structured polyanionic phosphates provides feasible strategy develop high‐energy‐density sodium‐ion batteries.

Язык: Английский

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Achieving High-Rate and Stable Sodium-Ion Storage by Constructing Okra-Like NiS₂/FeS₂@Multichannel Carbon Nanofibers

ACS Applied Materials & Interfaces, Год журнала: 2024, Номер 16(15), С. 18991 - 19002

Опубликована: Апрель 8, 2024

Transition metal sulfides (TMSs) are considered as promising anode materials for sodium-ion batteries (SIBs) due to their high theoretical capacities. However, the relatively low electrical conductivity, large volume variation, and easy aggregation/pulverization of active seriously hinder practical application. Herein, okra-like NiS

Язык: Английский

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Multilayer Core–Sheath Wires with Radially Aligned N-Doped Carbon Nanohole Arrays for Boosting Energy Storage in Zinc-Ion Hybrid Supercapacitors

ACS Applied Materials & Interfaces, Год журнала: 2024, Номер 16(4), С. 4793 - 4802

Опубликована: Янв. 18, 2024

Aqueous zinc-ion hybrid supercapacitors (ZHSCs) with the characteristics of low cost, long cycle stability, and good safety have been regarded as potential candidates for wearable energy storage applications. Herein, we reasonably designed a unique binder-free nitrogen-doped (N-doped) porous carbon@TiO2@Ti multilayer core–sheath wire (N-CTNT), which has vertical N-doped carbon nanoholes radially aligned on surface. The structure nitrogen dopants N-CTNTs facilitated zinc deposition N-CTNT to form hierarchical robust zinc–carbon composite (Zn@N-CTNTs). A wire-shaped ZHSC was constructed Zn@N-CTNTs cathode anode electrodes, respectively. as-prepared an outstanding specific capacitance 488 mF cm–2 at 1 mA cm–2. This supercapacitor also exhibits excellent density 211 μW h cm–2, rate performance, stability capacity retention 90.4% after 16,000 cycles.

Язык: Английский

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Rapid and Up‐Scalable Flash Fabrication of Graphitic Carbon Nanocages for Robust Potassium Storage

Advanced Functional Materials, Год журнала: 2024, Номер 34(32)

Опубликована: Март 13, 2024

Abstract Graphitic carbon nanocages (CNCs) have garnered attention as viable candidates for potassium storage, primarily due to their notable crystallinity, large surface area, and rich porosity. Yet, the development of a rapid, scalable, economically feasible synthesis approach CNCs persists formidable challenge. This study presents rapid (millisecond‐scale) scalable (gram‐scale) method fabricating mesoporous characterized by high purity orderly graphitic structures, utilizing flash Joule heating technique. Employed CNC electrode developed herein exhibits exceptional performance metrics, including initial capacity, rate capability, cycling stability, surpassing numerous carbonaceous materials previously documented. Impressively, it delivers capacity 312.3 mAh g −1 at 0.1 A , maintains 175.1 2.0 retains 219.6 over 1000 cycles 1.0 . Molecular dynamics simulations in situ characterizations are employed elucidate this robust behavior. work underscores significant advantages technique synthesizing storage applications.

Язык: Английский

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Sulfur vacancies and heterogeneous interfaces promote high performance sodium storage of bimetallic chalcogenide hollow nanospheres

Journal of Energy Chemistry, Год журнала: 2024, Номер 95, С. 596 - 610

Опубликована: Апрель 19, 2024

Язык: Английский

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