Inhibiting Dissolution of Active Sites in 80 °C Alkaline Water Electrolysis by Oxyanion Engineering

Angewandte Chemie International Edition, Год журнала: 2024, Номер 63(32)

Опубликована: Май 29, 2024

Abstract Commercial alkaline water electrolysers typically operate at 80 °C to minimize energy consumption. However, NiFe‐based catalysts, considered as one of the most promising candidates for anode, encounter bottleneck high solubility such temperatures. Herein, we discover that dissolution NiFe layered double hydroxides (NiFe‐LDH) during operation not only leads degradation anode itself, but also deactivates cathode splitting, resulting in decay overall electrocatalytic performance. Aiming suppress dissolution, employed oxyanions inhibitors electrolyte. The added phosphates electrolyte inhibit loss NiFe‐LDH active sites 400 mA cm −2 1/3 original amount, thus reducing rate performance by 25‐fold. Furthermore, usage borates, sulfates, and carbonates yields similar results, demonstrating reliability universality site inhibitor, its role elevated electrolysis.

Язык: Английский

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Unlocking the potential of hydrogen evolution: Advancements in 3D nanostructured electrocatalysts supported on nickel foam

Applied Catalysis B Environment and Energy, Год журнала: 2024, Номер 355, С. 124197 - 124197

Опубликована: Май 12, 2024

Язык: Английский

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Hydrogen and High-Value-Added Chemicals from Glycerol Electroreforming Using a Highly Efficient and Selective Ligand-Stabilized PdCu Catalyst

ACS Sustainable Chemistry & Engineering, Год журнала: 2025, Номер unknown

Опубликована: Март 26, 2025

PdCu alloy nanoparticles stabilized by a secondary diamine ligand (L) bearing C16-alkyl chains at the nitrogen atoms were successfully synthesized. The PdCuL supported on Vulcan XC-72 (Cv) with very low metal loading (1 wt %) was applied in alkaline glycerol electroreforming experiments for both hydrogen generation and chemicals. PdCuL/Cv electrocatalyst exhibited excellent activity as an anode material oxidation specific of 6 A mgPd–1 1 V notable selectivity (up to 95%) high-value C3 products (glycerate tartronate). Sterically demanding L allows obtaining small stable size-controlled (dm 1.9 ± 0.7 nm) observed through high-resolution transmission electron microscopy (TEM) analysis before after catalysis testing. catalyst also thoroughly investigated X-ray photoelectron spectroscopy (XPS) absorption (XAS) techniques. Pd–Cu synergistic effect alcohol verified electrochemical experiments, which highlight superior catalytic 3 times) compared monometallic catalyst.

Язык: Английский

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Orange-peel derived carbon-loaded low content ruthenium nanoparticles as ultra-high performance alkaline water HER electrocatalysts

Dalton Transactions, Год журнала: 2023, Номер 52(43), С. 15839 - 15847

Опубликована: Янв. 1, 2023

Carbon materials have a very wide range of applications in the field electrocatalysis, both as catalyst bodies and excellent supports for catalysts. In this work, we obtained graphitic-like orange-peel derived carbon (OPC) material through pre-carbonization KOH activation strategies using discarded raw material. OPC has good graphitization characteristics few-layer structure, making it suitable support nanoparticle order to compare performance OPC, used commercial graphene benchmark, made two uniformly loaded with ruthenium nanoparticles under same conditions, HER catalysts (Ru/OPC Ru/rGO). The results indicate that Ru/OPC catalytic alkaline not only superior Ru/rGO, but also surpassing Pt/C. 1 M KOH; overpotential is 3 mV at -10 mA cm-2, greatly exceeding those Ru/rGO (100 mV) Pt/C (31 mV). Under high current density (j), even better; 79 136 -100 cm-2 -200 respectively. More importantly, TOF long-term stability, up 10.62 H2 s-1 an 100 almost no attenuation after 72 h operation -50 cm-2. exhibits acidic significantly Ru/rGO. For Ru/OPC, 86 mV, 167 214 143 253 306

Язык: Английский

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Temperature-dependence of magnetron sputtered NiFe films: Structure, morphology, optical, electrical and OER catalytic properties

Applied Surface Science, Год журнала: 2024, Номер 653, С. 159317 - 159317

Опубликована: Янв. 9, 2024

Язык: Английский

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Coupling MoS₂ nanosheets with CeO₂ for efficient electrocatalytic hydrogen evolution at large current densities

Chemical Communications, Год журнала: 2023, Номер 59(77), С. 11512 - 11515

Опубликована: Янв. 1, 2023

We developed an efficient MoS2 nanosheet electrode coupled with CeO2via a hydrothermal process to facilitate water adsorption and dissociation, which displayed good HER activity stability at large current density of 500 mA cm-2. In situ Raman spectroscopy confirmed the formation hydroxide ions based on strengthening Ce-O bond during HER.

Язык: Английский

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Polyaniline nanowires decorated nickel phosphides hollow spheres hydrogen evolution catalyst for proton exchange membrane electrolysis

Journal of Power Sources, Год журнала: 2024, Номер 596, С. 234099 - 234099

Опубликована: Янв. 21, 2024

Язык: Английский

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NiMoFeO and its derived composite material as highly efficient and robust OER and HER catalysts for intermittent water electrolysis

International Journal of Hydrogen Energy, Год журнала: 2024, Номер 82, С. 1341 - 1350

Опубликована: Авг. 8, 2024

Язык: Английский

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Ultrafast Electrodeposition of Durable NiFe Catalysts for Efficient Hydrogen Evolution Reaction

ChemistrySelect, Год журнала: 2025, Номер 10(1)

Опубликована: Янв. 1, 2025

Abstract Finding noble‐metal‐free hydrogen evolution reaction (HER) catalysts with facile synthesis and efficient performance is essential to carry out electrochemical overall water splitting for energy development. An ultrafast electrodeposition technique the of NiFe developed. The rapid nanoparticle film morphology was achieved by uniformly anchoring particles onto three‐dimensional nickel foam (NF) via one‐step constant‐current in 30 s. catalyst exhibited excellent HER electrocatalytic activity stability 1.0 M KOH solution. To attain a current density 10 mA·cm −2 , displayed favorable kinetics an overpotential 168 mV Tafel slope 168.5 mV·dec −1 . Continuous tests NiFe/NF electrode were conducted up 23 h at 10·mA·cm decrease merely 2 mV, exhibiting outstanding durability.

Язык: Английский

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A First-Principles Investigation of Substrate Oxidation Effects on the Catalytic Activity of Co Single-Atom Supported on C2N for Oxygen Evolution Reaction

Chemical Communications, Год журнала: 2025, Номер unknown

Опубликована: Янв. 1, 2025

In this work, the substrate oxidation effects on catalytic activity of a C 2 N supported Co single-atom for oxygen evolution reaction (OER) were theoretically investigated.

Язык: Английский

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