High‐Coordination and Nb‐Bridging of Bimetallic Amorphous P₆‐Nb‐W‐P₅ Clusters in Carbon Nanospheres for High‐Performance Sodium‐Ion Hybrid Capacitors

Advanced Science, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 23, 2025

Abstract Amorphous clusters are gaining prominence as prospective hosts for sodium‐ion hybrid capacitors (SIHCs), but their efficacy is still affected by atomic coordination. Optimization of ion storage and charge transport can be achieved through high coordination bimetallic configurations. Herein, high‐coordination amorphous P 6 ‐Nb‐W‐P 5 (Nb/W‐P) skillfully tailored bridging Nb into the second shell W in W‐P configuration, nested situ conductive stable N, co‐doped carbon nanospheres (Nb/W‐P@NPC). Such with atom utilization offer profuse Na + sites due to As an electron donor, Nb‐bridging subtly modify electronic structure clusters, broaden hybridization d‐p orbitals, thus improving transfer efficiency fostering diversified active sites. Compared low‐coordinated L @NPC high‐coordinated W‐P@NPC, reversible capacity Nb/W‐P@NPC upgrades 556.3 mAh g −1 at 0.1 A , alongside exceptional cycling stability rates. When integrated SIHCs, energy density high‐power output (223.6 9800 kg ) achieved. By systematically exploring effect design on efficacies this study has greatly advanced development SIHC technologies.

Language: Английский

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Enhanced Activity and Stability for Electrocatalytic Nitrate Reduction to Ammonia over Low‐Coordinated Cobalt

Small, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 31, 2025

It is still challenging to develop an effective strategy simultaneously enhance the activity and stability of electrocatalysts for electrocatalytic nitrate reduction reaction (eNO3RR). Herein, taking metallic cobalt as example, it demonstrated that construction low-coordinated nanosheets (L-Co NSs) by H2 plasma etching electrodeposited (Co can greatly eNO3RR. Compared with Co NSs, at -0.4 V versus RHE, removal rate, ammonia partial current density, yield are increased L-Co NSs from 82.14% 98.57%, 476 683 mA cm-2, 2.11 2.54 mmol h-1 respectively. In addition, demonstrate negligible decay after 30 cycles test, while show significant decline. situ electrochemical characterizations theoretical calculations verify abundance vacancies in not only contribute optimized electronic structure enhanced desorption key intermediate boost but also facilitate transformation Co(OH)2 Co0 promote stability. Furthermore, exhibit favorable performance removing simulated wastewater air discharge-electrocatalytic cascade system produce ammonia.

Language: Английский

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Engineering Ce Promoter to Regulate H^* Species to Boost Tandem Electrocatalytic Nitrate Reduction for Ammonia Synthesis

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 5, 2025

Abstract The renewable‐energy‐powered electroreduction of nitrate (NO 3 RR) to ammonia emerges as a generalist for contamination remediation, green synthesis, and even advanced energy conversion, garnering significant interest. However, it comes across limited yield selectivity due the imbalance active hydrogen (H * ) supply within cutting‐edge single‐center Cu‐based materials. Herein, secondary Ce entity is engineered into Cu/MoO 2 @C substrate by thermal treatment Ce‐doping NENU‐5 precursors provide H effectively. A high NH rate (20.3 ± 0.7 mg h −1 cat. NO − −to−NH Faradaic efficiency (92 3%) at −0.4 V (vs RHE) can be reached in 5%Ce‐Cu/MoO @C, ranking among recently reported state‐of‐the‐art catalysts. core this boosting performance lies dual‐site tandem catalysis, which Cu site adsorbs activates , dissociates water generate respectively. And spillover from vicinal x intermediates on promotes hydrogenation generation with selectivity. Theoretical calculations further indicate that engineering optimizes electronic properties, activation adsorbed decreases barrier rate‐determining step catalysis. These findings consolidate positive role rare earth center highlight its corresponding catalysis sustainable synthesis.

Language: Английский

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Embedding Pure‐Phase Fe₃C Functional Sites Into Biochar Matrix for Multi‐Scenario Electrocatalytic Ammonia Synthesis and Energy Conversion Utilization

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 7, 2025

Abstract The rational design and development of application‐oriented advanced functional catalysts is crucial for facilitating the conversion nitrogen oxides into high‐value ammonia. Herein, biomass derived from pomelo peel, which rich in metal complex groups exhibits a metallic foam‐like framework, utilized as precursor. Iron carbide (Fe 3 C) active sites are incorporated locally 2D, globally 3D biochar structure, enabling multi‐scenario green synthesis ammonia integrated energy utilization. As catalyst, Fe C‐BC achieved an yield rate up to 102120.53 µg h⁻¹ mg cat ⁻¹, with maximum selectivity 100%. A flow‐based electrolysis system featuring not only facilitated continuous but also enhanced solar harvesting. Additionally, nitrate battery employing anode exhibited high output enabled self‐driven synthesis, offering novel insights operational solutions future production. Density‐functional‐theory calculations confirmed that C actively reduces barrier key steps eNitRR process while accelerating water dissociation promote sustained proton supply. These findings collectively provide promising foundation advancing ammonia, emphasizing both efficient catalytic performance sustainable integration.

Language: Английский

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Recent advances in metal single−atom catalysts for ammonia electrosynthesis

Materials Horizons, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 1, 2025

This review provides insight into the development of advanced metal single-atom catalysts for ammonia electrosynthesis.

Language: Английский

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