Electrochemical Oxidation of Small Molecules for Energy‐Saving Hydrogen Production

Advanced Energy Materials, Journal Year: 2024, Volume and Issue: 14(30)

Published: May 27, 2024

Abstract Electrochemical water splitting is a promising technique for the production of high‐purity hydrogen. Substituting slow anodic oxygen evolution reaction with an oxidation that thermodynamically more favorable enables energy‐efficient Moreover, this approach facilitates degradation environmental pollutants and synthesis value‐added chemicals through rational selection small molecules as substrates. Strategies small‐molecule electrocatalyst design are critical to electrocatalytic performance, focus on achieving high current density, selectivity, Faradaic efficiency, operational durability. This perspective discusses key factors required further advancement, including technoeconomic analysis, new reactor system design, meeting requirements industrial applications, bridging gap between fundamental research practical product detection separation. aims advance development hybrid electrolysis applications.

Language: Английский

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Nanostructured Pr-Rich CexPr1-xO2-δ Mixed Oxides for Diesel Soot Combustion: Importance of Oxygen Lability

Nanomaterials, Journal Year: 2024, Volume and Issue: 14(6), P. 483 - 483

Published: March 7, 2024

Soot combustion experiments with 5%O2/He were conducted using model soot, and four distinct compositions of CexPr1-xO2-δ oxides varying nominal cerium (x = 0, 0.2, 0.3, 1) prepared. The catalyst samples comprehensively characterized techniques such as XRD, Raman spectroscopy, HR-TEM, N2 adsorption at −196 °C, XPS, O2-TPD, H2-TPR, work function measurements. Pr-rich compositions, ranging from Ce0.3Pr0.7O2-δ to PrO2-δ, resulted in a significant increase the total evolved O2 amounts enhanced reducibility. However, decrease textural properties catalysts was noted, which particularly important for pure praseodymia under synthesis route conducted. catalytic activity investigated two following contact modes mixing between soot catalyst: loose tight. results revealed that performance is associated surface tight mode combination surface/subsurface/bulk oxygen mobility BET area mode. Notably, temperatures estimated 10% 50% conversion (T10 T50) parameters achieved much lower than uncatalyzed combustion, even conditions. Specifically, 511 °C 538 Ce0.3Pr0.7O2 Ce0.2Pr0.8O2, respectively. While no direct correlation observed, relationship emerges values formation vacancies, whatever conditions used these On other hand, ability generate high population vacancies low temperatures, rather activation gas-phase O2, influences Pr-doped ceria catalysts, highlighting importance surface/subsurface vacancy generation, parameter showed better activity, value or considered.

Language: Английский

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CoFeBP Micro Flowers (MFs) for Highly Efficient Hydrogen Evolution Reaction and Oxygen Evolution Reaction Electrocatalysts

Nanomaterials, Journal Year: 2024, Volume and Issue: 14(8), P. 698 - 698

Published: April 17, 2024

Hydrogen is one of the most promising green energy alternatives due to its high gravimetric density, zero-carbon emissions, and other advantages. In this work, a CoFeBP micro-flower (MF) electrocatalyst fabricated as an advanced water-splitting by hydrothermal approach for hydrogen production with highly efficient evolution reaction (HER) oxygen (OER). The fabrication process MF systematically optimized thorough investigations on various synthesis post-annealing parameters. best electrode demonstrates HER/OER overpotentials 20 mV 219 at mA/cm2. MFs also exhibit low 2-electrode (2-E) cell voltage 1.60 V 50 mA/cm2, which comparable benchmark electrodes Pt/C RuO2. demonstrate excellent 2-E stability over 100 h operation under harsh industrial operational conditions 60 °C in 6 M KOH current density 1000 flower-like morphology can offer largely increased electrochemical active surface area (ECSA), systematic lead improved crystallinity MFs.

Language: Английский

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Large-Scale and Simple Synthesis of NiFe(OH)x Electrode Derived from Raney Ni Precursor for Efficient Alkaline Water Electrolyzer

Catalysts, Journal Year: 2024, Volume and Issue: 14(5), P. 296 - 296

Published: April 29, 2024

Water electrolysis is a crucial technology in the production of hydrogen energy. Due to escalating industrial demand for green hydrogen, required electrode size traditional alkaline water electrolyzer has been increasing. Numerous studies have focused on developing highly active oxygen evolution reaction (OER) catalysts electrolysis. However, there remains significant gap between microscale synthesis laboratory settings and macroscale preparation scenarios. This challenge particularly pronounced sizable self-supported electrodes. In this work, we employed commercially available Raney Ni-coated Ni mesh as precursor material fabricate NiFe(OH)x@Raney anode with substantial dimension exceeding 300 mm through straightforward immersion technique. The as-prepared exhibited remarkable electrocatalytic OER activity, an overpotential only 240 mV achieve 10 mA cm−2. performance comparable that NiFe-LDHs synthesized via hydrothermal method, which difficult scale up applications. Furthermore, demonstrated exceptional durability, maintaining stable operation over 100 h at current density 500 large-scale displayed consistent overpotentials across various areas, indicating uniform catalytic activity. When integrated into device, it delivered average cell voltage 1.80 V 200 cm−2 achieved direct energy consumption low 4.3 kWh/Nm3. These findings underline suitability electrodes applications, offering promising alternative energy-efficient production.

Language: Английский

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Amorphous Cobalt-Impregnated Nitrogen-Doped Carbon Encapsulation Nanochain Enhances Long-Lasting Electrochemical Water Splitting

ACS Applied Materials & Interfaces, Journal Year: 2024, Volume and Issue: 16(27), P. 35013 - 35023

Published: June 27, 2024

Electrochemical water splitting (EWS) is a promising way to attain H

Language: Английский

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Influence of Er₂O₃ Nanoclusters on Transition Metal Oxide Nanostructures in Water Oxidation

ACS Applied Nano Materials, Journal Year: 2024, Volume and Issue: 7(13), P. 15864 - 15873

Published: June 28, 2024

The search for an effective, stable, and economically viable electrocatalyst water splitting to replace expensive noble catalysts remains imperative. This investigation evaluates the impact of erbium oxide (Er2O3) on oxygen evolution reaction (OER) activity transition metal oxides (TMOs), including nickel (NiO), cobalt (Co3O4), iron (Fe2O3). Introducing Er2O3 nanoclusters into TMO nanostructures produces a heterostructure interface between active TMOs, leveraging Er2O3's unique 4f electron occupancy as effective electronic modulator, thus enhancing its electrocatalytic activity. Findings reveal that Fe2O3 hybrid (ErFeO) exhibits most promising OER activity, characterized by low overpotential Tafel slope, exceptional durability relative synthesized materials, outperforming commercial catalyst, RuO2. Consequently, ErFeO is prospective applications.

Language: Английский

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Precision Size Control of Supported Pd and Pt Nanoparticles via Controlled Electroless Deposition

Catalysts, Journal Year: 2025, Volume and Issue: 15(2), P. 156 - 156

Published: Feb. 8, 2025

Well-defined supported metal nanoparticle catalysts, with high uniformity in particle sizes of the dispersed metal, are crucial for studying their catalyzed reactions that exhibit structure sensitivity. For such conventional methods preparation may prove unsuitable controlling size and distribution. In this work, systematic growth Pd Pt particles was achieved through method electroless deposition (ED), which additional deposited on preexisting same metal. The ED process investigated by varying pump time, speed, molar ratios reagents during continuous addition precursor, as well reducing agent stabilizer, were hydrazine ethylenediamine, respectively. This allowed precise control rates, thus regulating size, distribution, density. A slower rate increasing amount ethylenediamine stabilizer lowering pumping speed. Slower rates resulted smaller tighter distributions compared to other preparations weight loading, characterized via X-ray diffraction (XRD), chemisorption, scanning-transmission electron microscopy (STEM) methods.

Language: Английский

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Reconstructed rich oxygen defects and Ag0 on Pr6O11 surface through interface-defect engineering for enhanced electrochemical carbon dioxide reduction

Journal of Colloid and Interface Science, Journal Year: 2025, Volume and Issue: unknown, P. 137368 - 137368

Published: March 1, 2025

Language: Английский

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Development of Electrochemical Water Splitting with Highly Active Nanostructured NiFe Layered Double Hydroxide Catalysts: A Comprehensive Review

Catalysts, Journal Year: 2025, Volume and Issue: 15(3), P. 293 - 293

Published: March 20, 2025

Electrochemical water splitting is a feasible and effective method for attaining hydrogen, offering mechanism renewable energy solutions to combat the world’s crises due scarcity of fossil fuels. Evidently, viability stability electrocatalysts are fundamental electrochemical water-splitting process. However, net efficiency this process noticeably hindered by kinetic drawbacks related OER. Hence, NiFe LDH has been widely used as highly efficient OER HER catalyst material its unique nanostructure, tunable composition, favorable electronic structure. This review offers systematic analysis latest progress in fabrication functional catalysts associated strategies, structure optimizations, performance improvements. Special emphasis given understanding role nanostructure engineering increasing active site accessibility, enhancing effectiveness subsequent electron transfer, boosting intrinsic catalytic activity Moreover, we discuss influence doping, defects, formation heterostructures with other materials on activities LDHs. Additional accounts basic structures provided, along an enhanced theoretical based DFT studies LDH. limitations potential developments work focus need existing synthesis approaches, catalysts, their insertion into working processes. comprehensive current state research use foster improved development sustainable hydrogen sources future.

Language: Английский

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Cooperative Cobalt-Doped and Carboxylate Anions Modification of NiFe-Layered Double Hydroxides for Improving Oxygen Evolution Reaction

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

Published: April 4, 2025

The disparity of the fast electron-slow proton process significantly hinders catalytic efficiency oxygen evolution reaction (OER) in water splitting, so it is necessary to develop efficient and stable materials mitigate elevated overpotentials. In this study, a one-step hydrothermal approach was utilized synthesize cobalt-doped, carboxylic-acid-modified NiFe-layered double hydroxide (CoNiFe-LDH/NF) catalyst with enhanced intrinsic activity. Introducing Co promotes generation active components, carboxylate anions accelerate transfer, synergistic interaction which endows CoNiFe-LDH/NF superior OER performance. Experimental results show that has an overpotential as low 230 mV at 100 mA cm-2, Tafel slope 38.5 dec-1, excellent stability for 120 h current density 10 cm-2. Furthermore, mechanistic exploration by molecular probe detection pH-dependent experiment showed modified closer lattice oxidation mechanism (LOM). This study provides effective strategy improve performance layered materials.

Language: Английский

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