Bubble evolution and transport in PEM water electrolysis: Mechanism, impact, and management

Progress in Energy and Combustion Science, Journal Year: 2023, Volume and Issue: 96, P. 101075 - 101075

Published: Jan. 18, 2023

Language: Английский

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Solutal Marangoni effect determines bubble dynamics during electrocatalytic hydrogen evolution

Nature Chemistry, Journal Year: 2023, Volume and Issue: 15(11), P. 1532 - 1540

Published: Aug. 10, 2023

Language: Английский

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Coupling Adsorbed Evolution and Lattice Oxygen Mechanism in Fe‐Co(OH)₂/Fe₂O₃ Heterostructure for Enhanced Electrochemical Water Oxidation

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(45)

Published: Sept. 1, 2023

Abstract Oxygen evolution reaction (OER) remains a bottleneck for electrocatalytic water‐splitting to generate hydrogen. However, the traditional adsorbed mechanism (AEM) possesses sluggish kinetics due scaling relationship, while lattice oxygen (LOM) triggers an unstable structure escaping of oxygen. Herein, proof‐of‐concept Fe‐Co(OH) 2 /Fe O 3 heterostructure is put forward, where following AEM can complete rapidly deprotonation process Fe LOM trigger O─O coupling step. Combining theoretical and experimental investigation confirmed that redistributed space‐charge junction optimize synergistically oxygen, facilitate synchronously OER activity stability. As result, shows excellent performance with low overpotential only 219 249 mV reach current density 10 100 mA cm −2 . Specifically, electrocatalyst maintains long‐term stability h at large This work paves avenue break through limit conventional mechanism.

Language: Английский

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Efficient bubble/precipitate traffic enables stable seawater reduction electrocatalysis at industrial-level current densities

Nature Communications, Journal Year: 2024, Volume and Issue: 15(1)

Published: April 5, 2024

Abstract Seawater electroreduction is attractive for future H 2 production and intermittent energy storage, which has been hindered by aggressive Mg 2+ /Ca precipitation at cathodes consequent poor stability. Here we present a vital microscopic bubble/precipitate traffic system (MBPTS) constructing honeycomb-type 3D robust anti-precipitation seawater reduction (SR), massively/uniformly release small-sized bubbles to almost every corner of the cathode repel precipitates without break. Noticeably, optimal with built-in MBPTS not only enables state-of-the-art alkaline SR performance (1000-h stable operation –1 A cm −2 ) but also highly specialized in catalytically splitting natural into greatest ability. Low amounts after prolonged tests under large current densities reflect genuine efficacy our MBPTS. Additionally, flow-type electrolyzer based on stably functions industrially-relevant 500 mA 150 h while unwaveringly sustaining near-100% Faradic efficiency. Note that estimated price (~1.8 US$/kg H2 even cheaper than US Department Energy’s goal (2 ).

Language: Английский

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Highly Efficient Biomass Upgrading by a Ni−Cu Electrocatalyst Featuring Passivation of Water Oxidation Activity

Angewandte Chemie International Edition, Journal Year: 2023, Volume and Issue: 62(37)

Published: July 24, 2023

Abstract Electricity‐driven organo‐oxidations have shown an increasing potential recently. However, oxygen evolution reaction (OER) is the primary competitive reaction, especially under high current densities, which leads to low Faradaic efficiency (FE) of product and catalyst detachment from electrode. Here, we report a bimetallic Ni−Cu electrocatalyst supported on Ni foam (Ni−Cu/NF) passivate OER process while oxidation 5‐hydroxymethylfurfural (HMF) significantly enhanced. A density 1000 mA cm −2 can be achieved at 1.50 V vs . reversible hydrogen electrode, both FE yield keep close 100 % over wide range potentials. Both experimental results theoretical calculations reveal that Cu doping impedes OH* deprotonation O* hereby greatly passivated. Those instructive provide new approach realizing highly efficient biomass upgrading by regulating activity.

Language: Английский

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Ternary NiMo-Bi liquid alloy catalyst for efficient hydrogen production from methane pyrolysis

Science, Journal Year: 2023, Volume and Issue: 381(6660), P. 857 - 861

Published: Aug. 24, 2023

Methane pyrolysis (MP) is a potential technology for CO2-free hydrogen production that generates only solid carbon by-products. However, developing highly efficient catalyst stable methane at moderate temperature has been challenging. We present new and created by modifying Ni-Bi liquid alloy with the addition of Mo to produce ternary NiMo-Bi (LAC). This exhibited considerably low activation energy 81.2 kilojoules per mole, which enabled MP temperatures between 450 800 Celsius generation efficiency 4.05 ml gram nickel minute. At Celsius, 100% H2 selectivity 120 hours stability.

Language: Английский

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A review on recent trends, challenges, and innovations in alkaline water electrolysis

International Journal of Hydrogen Energy, Journal Year: 2024, Volume and Issue: 64, P. 599 - 625

Published: March 30, 2024

Language: Английский

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The formation of unsaturated IrOx in SrIrO3 by cobalt-doping for acidic oxygen evolution reaction

Nature Communications, Journal Year: 2024, Volume and Issue: 15(1)

Published: April 4, 2024

Abstract Electrocatalytic water splitting is a promising route for sustainable hydrogen production. However, the high overpotential of anodic oxygen evolution reaction poses significant challenge. SrIrO 3 -based perovskite-type catalysts have shown great potential acidic reaction, but origins their activity are still unclear. Herein, we develop Co-doped system to enhance and elucidate origin catalytic activity. In situ experiments reveal Co activates surface lattice oxygen, rapidly exposing IrO x active sites, while bulk doping optimizes adsorbate binding energy . The demonstrates electrocatalytic activity, markedly surpassing commercial 2 in both conventional electrolyzer proton exchange membrane electrolyzer.

Language: Английский

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Hydrogen spillover in MoOxRh hierarchical nanosheets boosts alkaline HER catalytic activity

Applied Catalysis B Environment and Energy, Journal Year: 2023, Volume and Issue: 341, P. 123275 - 123275

Published: Sept. 7, 2023

Language: Английский

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Electroreduction of alkaline/natural seawater: Self-cleaning Pt/carbon cathode and on-site co-synthesis of H2 and Mg hydroxide nanoflakes

Chem, Journal Year: 2024, Volume and Issue: 10(10), P. 3067 - 3087

Published: June 18, 2024

Language: Английский

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