Multi-site catalysis of high-entropy hydroxides for sustainable electrooxidation of glucose to glucaric acid

Energy & Environmental Science, Год журнала: 2024, Номер 17(9), С. 3042 - 3051

Опубликована: Янв. 1, 2024

Multi-site catalysis of high-entropy hydroxides for co-production glucaric acid and ammonia.

Язык: Английский

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A Solid‐Solution with Asymmetric Ni‐O‐Cr Sites for Boosting Protonation toward Anodic Oxidation

Advanced Energy Materials, Год журнала: 2024, Номер 14(38)

Опубликована: Июль 14, 2024

Abstract Replacing the slow protonation process of oxygen evolution reaction (OER) with fast alcohol electro‐oxidation can decrease driving potentials, thus improving overall efficiency electrochemical devices. However, formation effective catalytic sites for oxidation remains challenging in accelerating to inhibit metal leaching and improve catalyst stability. Herein, asymmetric Ni‐O‐Cr are constructed by alloying Cr into NiO matrix optimize coordination environments, showing significantly enhanced stability during electro‐oxidation. The maintain constant valence states Ni oxidation, efficiently suppressing dissolution even at high potentials. In situ characterizations combined theoretical calculations indicate that adsorption activation OH* molecules compared pure NiO, increasing anodic kinetics. results also smaller gap 3 d ‐O 2 p strengthens charge transfer, leading This work gives insights boosting using sites‐enriched solid‐solution electrocatalysts.

Язык: Английский

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Mn‐Based Mullites for Environmental and Energy Applications

Advanced Materials, Год журнала: 2024, Номер 36(21)

Опубликована: Апрель 15, 2024

Abstract Mn‐based mullite oxides AMn 2 O 5 (A = lanthanide, Y, Bi) is a novel type of ternary catalyst in terms their electronic and geometric structures. The coexistence pyramid Mn 3+ –O octahedral 4+ makes the d‐orbital selectively active toward various catalytic reactions. alternative edge‐ corner‐sharing stacking configuration constructs confined sites abundant oxygen species. As result, they tend to show superior behaviors thus gain great attention environmental treatment energy conversion storage. In applications, mullites have been demonstrated be highly low‐temperature oxidization CO, NO, volatile organic compounds (VOCs), etc. Recent research further shows that decompose 3 ozonize VOCs from −20 °C room temperature. Moreover, enhance reduction reactions (ORR) sulfur (SRR), critical kinetic steps air‐battery Li–S batteries, respectively. Their distinctive structures also facilitate applications gas‐sensitive sensing, ionic conduction, high mobility dielectrics, storage, piezoelectricity, dehydration, H decomposition, beyond. A comprehensive review basic physicochemical properties application certainly not only gains full picture but provides new insights into designing heterogeneous catalysts.

Язык: Английский

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Pd Nanoparticle Size‐Dependent H^* Coverage for Cu‐Catalyzed Nitrate Electro‐Reduction to Ammonia in Neutral Electrolyte

Small, Год журнала: 2024, Номер 20(46)

Опубликована: Авг. 3, 2024

Abstract Electrochemical conversion of nitrate (NO 3 − ) to ammonia (NH is an effective approach reduce pollutants in the environment and also a promising low‐temperature, low‐pressure method for synthesis. However, adequate H * intermediates are highly expected NO hydrogenation, while suppressing competitive hydrogen evolution. Herein, effect coverage on RR synthesis by Cu electrocatalysts investigated. The can be adjusted changing Pd nanoparticle sizes. optimized Pd@Cu with average size 2.88 nm shows best activity RR, achieving maximum Faradaic efficiency 97% (at −0.8 V vs RHE) NH yield 21 mg h −1 cm 2 , from industrial wastewater level 500 ppm – . In situ electrochemical experiments indicate that particles promote hydrogenation via well‐modulated adsorbed species. Coupling anodic glycerol oxidation reaction, ammonium formate successfully obtained as value‐added products membrane electrode assembly electrolyzer. This work provides feasible strategy obtaining size‐dependent hydrogenation.

Язык: Английский

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Vertical Cross‐Alignments of 2D Semiconductors with Steered Internal Electric Field for Urea Electrooxidation via Balancing Intermediates Adsorption

Small, Год журнала: 2024, Номер 20(34)

Опубликована: Апрель 10, 2024

Abstract Single‐component electrocatalysts generally lead to unbalanced adsorption of OH − and urea during oxidation reaction (UOR), thus obtaining low activity selectivity especially when oxygen evolution (OER) competes at high potentials (>1.5 V). Herein, a cross‐alignment strategy in situ vertically growing Ni(OH) 2 nanosheets on 2D semiconductor g‐C 3 N 4 is reported form hetero‐structured electrocatalyst. Various spectroscopy measurements including experiments indicate the existence enhanced internal electric field interfaces vertical nanosheets, favorable for balancing intermediates. This heterojunction electrocatalyst shows high‐selectivity UOR compared pure , even V) large current density. The computational results show could steer increase urea, efficiently avoiding poisoning strongly adsorbed active sites. A membrane electrode assembly (MEA)‐based electrolyzer with anode operate an industrial‐level density 200 mA cm −2 . work paves avenue designing high‐performance by cross‐alignments components.

Язык: Английский

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Optimizing the Dehydrogenation Kinetics of Metal Nitrides for Energy‐Efficient Seawater Hydrogen Production at 2 A cm⁻²

Advanced Functional Materials, Год журнала: 2024, Номер 34(40)

Опубликована: Апрель 12, 2024

Abstract Seawater hydrogen production, vital for sustainable energy solutions and freshwater preservation, faces challenges due to seawater complexity high consumption. A strategy modulate dehydrogenation kinetics of dual‐phase metal nitrides using low‐loaded Pt quantum dots (QDs), achieving stable energy‐efficient generation is introduced. The QDs@Ni 3 N‐MoN/Ti catalyst displays outstanding bifunctional catalytic performance, enabling efficient production hydrazine degradation in a flow anion exchange membrane water electrolysis (AEMWE) device. Operating at low voltage 1.41 V, it achieves 2 cm −2 300 h, circumventing chlorine corrosion yielding record‐breaking equivalent input (2.68 kWh m −3 H 1 ), 47.1% reduction compared traditional methods. Integration with solar biomass facilitates self‐powered hybrid highlighting its potential applications. This work marine resource conversion green offers viable insights into industrial hazardous pollutant metal‐nitride electrocatalysts.

Язык: Английский

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Realizing golden ultraviolet C emission of 265 nm by oxygen vacancies engineering for 100 % sterilization efficiency

Ceramics International, Год журнала: 2024, Номер 50(17), С. 30579 - 30586

Опубликована: Май 23, 2024

Язык: Английский

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Hierarchical NiFeP Nanoflowers on the MXene Film as a Self-Standing Bifunctional Electrode toward Superior Overall Water Electrolysis

ACS Applied Nano Materials, Год журнала: 2024, Номер 7(7), С. 7684 - 7693

Опубликована: Март 15, 2024

The exploitation of highly active, nonprecious metal bifunctional electrodes to facilitate the hydrogen evolution reaction (HER) and oxygen (OER) is essential for water electrolysis produce hydrogen, but performances are still unsatisfactory. Herein, a facile strategy was proposed fabricate three-dimensional (3D) bimetallic phosphide (NiFeP) nanoflower array on self-standing assembled MXene nanosheet film (denoted as NiFeP@MXene) structurally integrated electrode overall splitting. NiFeP@MXene with 3D hierarchical structures can be directly used an without traditional polymer binders, which significantly reduces contact resistance facilitates electron transfer at interface. Meanwhile, interfacial synergistic coupling created between conductive phosphides, favorable catalytic activity. Moreover, addition Fe improves intrinsic activity simultaneously formation flower-like more active sites. Thus, demonstrates excellent in alkaline electrolyte small overpotentials 240 122 mV drive 10 mA cm–2 current density OER HER, respectively, along superior performance compared commercial precious IrO2∥Pt/C catalyst.

Язык: Английский

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Bi Nanospheres Embedded in N‐Doped Carbon Nanowires Facilitate Ultrafast and Ultrastable Sodium Storage

Advanced Science, Год журнала: 2024, Номер 11(28)

Опубликована: Май 2, 2024

Abstract Sodium ion batteries (SIBs) are considered as the ideal candidates for next generation of electrochemical energy storage devices. The major challenges anode lie in poor cycling stability and sluggish kinetics attributed to inherent large Na + size. In this work, Bi nanosphere encapsulated N‐doped carbon nanowires (Bi@N‐C) is assembled by facile electrospinning carbonization. mitigates structure stress/strain during alloying/dealloying, optimizes ionic/electronic diffusion, provides fast electron transfer structural stability. Due excellent structure, Bi@N‐C shows performance SIBs terms good rate capacity half cells full cells. fundamental mechanism outstanding has been demonstrated through synchrotron in‐situ XRD, atomic force microscopy, ex‐situ scanning microscopy (SEM) density functional theory (DFT) calculation. Importantly, a deeper understanding underlying reasons improvement elucidated, which vital providing theoretical basis application SIBs.

Язык: Английский

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Layered Iron Vanadate for High‐Performance and Stable Cathode Material for Aqueous Manganese Batteries

Advanced Science, Год журнала: 2025, Номер unknown

Опубликована: Апрель 7, 2025

Abstract Aqueous rechargeable metal batteries have gained significant attention because of the low cost, high capacity, and inherent safety offered by nonflammable water‐based electrolytes. Among these, Mn‐based systems are promising owing to their intrinsic stability, abundance, affordability, energy density. Despite these advantages, development suitable host structures for Mn storage remains underexplored. This study introduces layered iron vanadate, FeV 3 O 9 ·1.1H 2 O, as a new cathode material aqueous batteries, demonstrating exceptional performance. The exhibits reversible capacity 306.9 mAh g −1 at 0.25 A an excellent rate performance 210.6 . In addition, outstanding cycling retaining 73.4% its initial after 3000 cycles − ¹, which is attributed volume expansion. underlying reaction mechanism elucidated through spectroscopic microscopic analyses. When integrated into final cell, system demonstrates superior compared Zn underscoring potential next‐generation battery systems. These findings advance technology, paving way safer, more cost‐effective, high‐performance solutions.

Язык: Английский

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