Toward Understanding the Formation Mechanism and OER Catalytic Mechanism of Hydroxides by In Situ and Operando Techniques

Angewandte Chemie International Edition, Год журнала: 2023, Номер 62(51)

Опубликована: Авг. 31, 2023

Abstract Developing efficient and affordable electrocatalysts for the sluggish oxygen evolution reaction (OER) remains a significant barrier that needs to be overcome practical applications of hydrogen production via water electrolysis, transforming CO 2 value‐added chemicals, metal‐air batteries. Recently, hydroxides have shown promise as OER. In situ or operando techniques are particularly indispensable monitoring key intermediates together with understanding process, which is extremely important revealing formation/OER catalytic mechanism preparing cost‐effective However, there lack comprehensive discussion on current status challenges studying these mechanisms using in techniques, hinders our ability identify address obstacles present this field. This review offers an overview outlining their capabilities, advantages, disadvantages. Recent findings related formation OER revealed by also discussed detail. Additionally, some field concluded appropriate solution strategies provided.

Язык: Английский

---

Heterostructured electrocatalysts for the oxygen evolution reaction

Journal of Materials Chemistry A, Год журнала: 2024, Номер 12(30), С. 18832 - 18865

Опубликована: Янв. 1, 2024

This review focuses mainly on the overall facilitating effect of heterostructures OER process. The fabrication heterostructured electrocatalysts and relationship between their structures electrocatalytic properties are discussed.

Язык: Английский

---

Defects and morphology engineering for constructing VS-Ni3S2@VS-Cu2S nanotube heterojunction arrays toward efficient bifunctional electrocatalyst for overall water splitting

Journal of Energy Chemistry, Год журнала: 2024, Номер 94, С. 29 - 40

Опубликована: Фев. 28, 2024

Язык: Английский

---

High-entropy alloy enables multi-path electron synergism and lattice oxygen activation for enhanced oxygen evolution activity

Nature Communications, Год журнала: 2025, Номер 16(1)

Опубликована: Апрель 8, 2025

Electrocatalytic oxygen evolution reaction (OER) is key to several energy technologies but suffers from low activity. Leveraging the lattice activation mechanism (LOM) a strategy for boosting its However, this approach faces significant thermodynamic challenges, requiring high-valent oxidation of metal ions without compromising their stability. We reveal that high-entropy alloys (HEAs) can efficiently activate LOM through synergistic multi-path electron transfer. Specifically, nickel enhanced by transfer, aided integration weaker Co-O bonds, enabling effective at Ni-Co dual-site. These insights allow design NiFeCoCrW0.2 HEA exhibits improved activity, achieving an overpotential 220 mV current density 10 mA cm-2. It also demonstrates good stability, maintaining potential with less than 5% variation over 90 days 100 cm-2 density. This study sheds light on effects confer high activity in HEAs and contribute advancement high-performance OER electrocatalysts.

Язык: Английский

---

Defects engineering of layered double hydroxide-based electrocatalyst for water splitting

CHINESE JOURNAL OF CATALYSIS (CHINESE VERSION), Год журнала: 2023, Номер 55, С. 116 - 136

Опубликована: Дек. 1, 2023

Язык: Английский

---

Protective Cerium Oxide Coating Promoted Ce‐Doping and Reconstruction of High‐Valence NiFe Sulfide toward Robust Overall Water Splitting

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

Опубликована: Авг. 25, 2023

Abstract Active and stable electrocatalysts toward oxygen evolution reaction (OER) are essential for alkaline water splitting. Herein, an efficient durable high‐valence NiFe‐based OER electrocatalyst is developed, featuring a protective CeO 2− x coating to prevent the corrosion of carbon substrates during oxidative operation, ensuring excellent catalyst stability. The incorporation also leads formation Ce‐doped NiFe sulfide catalyst. Ce modulator enables dynamic transformation into highly active (oxy)hydroxide species with Ni sites enhanced Ni─O covalency, thereby improving its catalytic activity. Accordingly, prepared NiFeS 2 /CeO /CC achieves activity overpotential 260 mV at 100 mA cm −2 in 1.0 m KOH. Moreover, current density 187 hydrogen reaction. anion exchange membrane electrolyzer reached 500 1.73 V cell voltage stability h continuous operation. This study demonstrates promising approach fabrication robust water‐splitting electrocatalysts.

Язык: Английский

---

Metal-organic framework-derived cation regulation of metal sulfides for enhanced oxygen evolution activity

CHINESE JOURNAL OF CATALYSIS (CHINESE VERSION), Год журнала: 2023, Номер 54, С. 290 - 297

Опубликована: Ноя. 1, 2023

Язык: Английский

---

Ce‐Doping Rather Than CeO₂ Modification and Their Synergistic Effect: Promotion from Ce Species in the Electrocatalytic Oxidation of 5‐Hydroxymethylfurfural Over NiFe–LDH

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

Опубликована: Июль 11, 2024

Abstract Electrocatalytic oxidation of 5‐hydroxymethylfurfural (HMFOR) is an effective route to produce value‐added chemicals with low energy consumption. In this work, efficient electrocatalysts are prepared by varying the amount Ce doping and CeO 2 modification on NiFe layered double hydroxide (NiFe–LDH) nanosheets supported carbon cloth (CC). Through heterogeneous interface construction, electronic structure coordination chemistry NiFe–LDH greatly changed. Compared synergistic effect Ce‐doping modification, CC@NiFeCe(3%)‐LDH only show excellent charge transfer ability, higher HMF conversion (95.73%), 2,5‐furandicarboxylic acid (FDCA) selectivity (93.31%), Faraday efficiency (99.47%) at 1.44 V RHE . Density‐functional theory calculations X‐ray fine spectroscopy demonstrate that doping, compared their effects, significantly facilitates electron transport optimizes intermediate adsorption effectively lowering activation for transformation 5‐formyl‐2‐furancarboxylic (FFCA) encourage FFCA FDCA. Overall, work systemically investigates HMFOR behaviors CC@NiFe–LDH under synergetic effect, which provides some guidance development high‐performance performance.

Язык: Английский

---

Enhanced electrochemical oxidation of 5-hydroxymethylfurfural over tailored nickel nanoparticle assembly

Applied Catalysis B Environment and Energy, Год журнала: 2024, Номер 353, С. 124086 - 124086

Опубликована: Апрель 17, 2024

Язык: Английский

---

Vacancy Mediated Electrooxidation of 5‐Hydroxymethyl Furfuryl Using Defect Engineered Layered Double Hydroxide Electrocatalysts

Advanced Energy Materials, Год журнала: 2024, Номер unknown

Опубликована: Июнь 4, 2024

Abstract Electrochemical biomass oxidation coupled with hydrogen evolution offers a promising route to generate value‐added chemicals and clean energy. The complex adsorption behavior of 5‐hydroxymethyl furfural (HMF) hydroxyl ions (OH − ) on the electrocatalyst surface during HMF electrooxidation reaction (HMFOR) necessitates an in‐depth understanding active sites available for adsorption. Herein, oxygen vacancy (V O defects are introduced in NiFe layered double hydroxide (LDH) using Ce dopants manipulate electronic structure. Synchrotron‐based HE‐XRD XAS indicate negligible V La‐doped while doping leads due flexible redox (Ce 3+ ↔ 4+ ). ‐rich Ce‐NiFe exhibits higher Faradic efficiency ≈90% produce 2,5‐furan dicarboxylic acid (FDCA), far greater than ≈60% act as alternative OH adsorption, hence reducing competition same metal sites. DFT calculation results corroborate experimental findings by showcasing that presence manipulates energies facilitates chemical improve HMFOR. In situ derived pair distribution function RMC simulations confirm trapping centers evident interlayer distance evolution. Taken together, this work showcases routes dual‐site design improved electrooxidation.

Язык: Английский

---