Performance Enhancement of Electrocatalytic Hydrogen Evolution through Coalescence-Induced Bubble Dynamics

Journal of the American Chemical Society, Год журнала: 2024, Номер 146(14), С. 10177 - 10186

Опубликована: Март 27, 2024

The evolution of electrogenerated gas bubbles during water electrolysis can significantly hamper the overall process efficiency. Promoting departure electrochemically generated (water) is therefore beneficial. For a single bubble, from electrode surface occurs when buoyancy wins over downward-acting forces (e.g., contact, Marangoni, and electric forces). In this work, dynamics pair H2 produced hydrogen reaction in 0.5 M H2SO4 using dual platinum microelectrode system systematically studied by varying distance cathodic potential. By combining high-speed imaging electrochemical analysis, we demonstrate importance bubble–bubble interactions process. We show that bubble coalescence may lead to substantially earlier as compared effects alone, resulting considerably higher rates at constant However, due continued mass input conservation momentum, repeated events with close drive departed back beyond critical current, which increases spacing. latter leads resumption growth near surface, followed buoyancy-driven departure. While less favorable small spacing, configuration proves be very beneficial larger separations, increasing mean current up 2.4 times under conditions explored study.

Язык: Английский

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Rational design of local microenvironment for electrocatalytic water splitting

Inorganic Chemistry Frontiers, Год журнала: 2024, Номер 11(14), С. 4080 - 4106

Опубликована: Янв. 1, 2024

This summary describes the effects of wettability, local pH, interfacial water structure, and electrolyte composition on interface reactant compositions, key intermediate adsorption, reaction kinetics.

Язык: Английский

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Benchmarking stable Electrocatalysts for green hydrogen production: A chemist perspective

Coordination Chemistry Reviews, Год журнала: 2024, Номер 521, С. 216112 - 216112

Опубликована: Авг. 24, 2024

Electro-induced water splitting module is a fascinating strategy for the conversion of electricity into scalable and clean H 2 as future energy carrier has significantly attracted attention scientific community. Despite countless research on electrolyzers, cost-effective durable electrode materials with high efficiency remain challenge dream in this quest. This critical review devoted to systemically presenting upsurge recently rationally explored highly stable benchmark electrocatalysts (both noble non-noble) understand design principles, performances, compelling reasons/chemistry behind enhanced catalytic potential over traditional half-cell oxygen evolution reaction (OER) hydrogen (HER). Moreover, (at least ≥50 h) their bi-functional conduct evaluated prototype electrolyzer integrated photovoltaic (PV) or batteries at laboratory level are discussed, yet an untold unsummarized story electrochemical splitting. Next, current status technology, socio-economic challenges, possible solutions, key considerations fundamental principles/concepts scheme outlined from point practical application. Typical challenges regarding identifying, preparing, scaling electrocatalysts, but foundations now strong, outlook visible exciting next-generation technology. • Critical Benchmark Understanding performances mechanistic studies scrutiny technology Long term stability electrocatalyst Full cell investigation PV integration

Язык: Английский

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Unveiling OER bubble dynamics in alkaline electrolysis: Impacts on cell resistance

International Journal of Hydrogen Energy, Год журнала: 2025, Номер 106, С. 138 - 145

Опубликована: Фев. 1, 2025

Язык: Английский

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Enhanced solar water oxidation and unassisted water splitting using graphite-protected bulk heterojunction organic photoactive layers

Nature Energy, Год журнала: 2025, Номер unknown

Опубликована: Март 18, 2025

Abstract Polymer donors and non-fullerene acceptors have played an important role as photoactive materials in the development of high-efficiency organic solar cells immense potential devices for direct hydrogen generation. However, their use water-splitting has been limited by instability aqueous environment recombination losses at interface with catalysts. Here we report anodes containing PM6:D18:L8-BO layers reaching high water oxidation photocurrent density over 25 mA cm −2 +1.23 V versus reversible electrode days-long operational stability. This was achieved integrating layer a graphite sheet functionalized earth-abundant NiFeOOH catalyst, which provides both resistance electrical connection between catalyst without any losses. Using monolithic tandem PTQ10:GS-ISO layers, achieve solar-to-hydrogen efficiency 5%. These results pave way towards high-efficiency, stable unassisted generation low-cost materials.

Язык: Английский

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Bridging Innovations of Phase Change Heat Transfer to Electrochemical Gas Evolution Reactions

Chemical Reviews, Год журнала: 2024, Номер 124(17), С. 10052 - 10111

Опубликована: Авг. 28, 2024

Bubbles play a ubiquitous role in electrochemical gas evolution reactions. However, mechanistic understanding of how bubbles affect the energy efficiency processes remains limited to date, impeding effective approaches further boost performance systems. From perspective analogy between heat and mass transfer, reactions exhibit highly similar dynamic behaviors them liquid–vapor phase change. Recent developments change systems have substantially advanced fundamental knowledge bubbles, leading unprecedented enhancement transfer performance. In this Review, we aim elucidate promising opportunity bubble dynamics through lens transfer. We first provide background about key parallels Then, discuss across multiple length scales, with an emphasis on exciting research problems inspired by new insights gained from Lastly, review advances engineered surfaces for manipulating enhance providing outlook design high-performance evolving electrodes.

Язык: Английский

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Rationalizing the Superior Catalytic Efficiency of Nickel Nitride vs Nickel Sulfide for Alkaline Hydrogen Evolution Reaction from Bubble Dynamics Study and Density Functional Theory (DFT) Calculations

ACS Catalysis, Год журнала: 2025, Номер unknown, С. 3823 - 3835

Опубликована: Фев. 18, 2025

Due to their high electronic conductivity, catalytic activity, and superior chemical stability, nickel nitrides sulfides have been demonstrated be cost-effective robust electrocatalysts for achieving HER under alkaline conditions. Herein, we report on a simple optimized approach directly grow single-phase nitride (Ni3N) sulfide (Ni3S2) flat substrate. Different preparation conditions are tested in order achieve materials exhibiting the best electrocatalytic efficiency HER. The Ni3N Ni3S2 obtained at 700 °C 30 min ammonia gas flow 350 1 h 10% H2S/H2 mixture, respectively. operate M KOH more efficiently than Ni3S2, as supported by overpotential values of 0.189, 0.291, 0.342 V measured 10, 100, 200 mA cm–2, respectively, which lower those i.e., 0.204, 0.351, 0.417 V. Remarkably, it is worth noticing that its activity competes with Pt current densities higher cm–2. Its corroborated additional cyclic voltammetry (Tafel slopes) electrochemical impedance spectroscopy measurements. Moreover, found stable over 45 electrolysis 10 cm–2 potential change only 24 31 mV, To gain further understanding activities both materials, density functional theory (DFT) calculations an situ bubble dynamics study performed. Owing hydrophilic character Ni3N, smaller H2 bubbles form detach rapidly from surface leads fast renewal active In contrast, size retention time increase, leading adverse blockage sites requiring This observation perfectly aligns DFT calculations, show H2O adsorption predominantly favored surface. Our work highlights use planar electrocatalyst support instead foam-type porous one essential evaluate alone contribution electrogenerated consequently impact performance.

Язык: Английский

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Preparation of Ni nanocone/Grid electrodes by laser-electrodeposition combined process as an efficient and stable electrocatalyst for hydrogen evolution reaction

International Journal of Hydrogen Energy, Год журнала: 2024, Номер 89, С. 518 - 530

Опубликована: Сен. 29, 2024

Язык: Английский

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Interface engineering via molecules/ions/groups for electrocatalytic water splitting

Nano Research, Год журнала: 2024, Номер 17(9), С. 7864 - 7879

Опубликована: Июль 24, 2024

Язык: Английский

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Tuning Surface Electronics State of P-Doped In_2.77S₄/In(OH)₃ toward Efficient Photoelectrochemical Water Oxidation

Langmuir, Год журнала: 2024, Номер 40(16), С. 8533 - 8541

Опубликована: Апрель 12, 2024

Indium sulfide with a two-dimensional layered structure offers platform for catalyzing water oxidation by photoelectrochemical process. However, the limited hole holders hinder weak intrinsic catalytic activity. Here, nonmetallic phosphorus atom is coordinated to In2.77S4/In(OH)3 through bridge-bonded sulfur atom. By substituting S position P dopant, work function (surface potential) regulated from 445 210 mV, and lower surface potential shown be beneficial holding photogenerated holes. In2.77S4/In(OH)3/P introduces built-in electric field under difference of Fermi energy, direction bulk surface. This band results in upward bending at interface P-doped sites, which identified density functional theory calculations (∼0.8 eV difference). stands out highest efficiency (ηoxi = 70%) charge separation (ηsep 69%). Importantly, it delivers remarkable photocurrent 2.51 mA cm–2 one sun illumination.

Язык: Английский

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