Chemical Engineering Science, Journal Year: 2025, Volume and Issue: unknown, P. 121598 - 121598
Published: March 1, 2025
Language: Английский
Chemical Reviews, Journal Year: 2024, Volume and Issue: unknown
Published: Sept. 11, 2024
Gas bubbles generated by the hydrogen evolution reaction and oxygen during water electrolysis influence energy conversion efficiency of production. Here, we survey what is known about interaction gas electrode surfaces on practicable devices used for electrolysis. We outline physical processes occurring life cycle a bubble, summarize techniques to characterize phenomena in situ practical device environments, discuss ways that electrodes can be tailored facilitate removal at high current densities. Lastly, review efforts model behavior individual multiphase flows produced gas-evolving electrodes. conclude our with short summary outstanding questions could answered future electrochemical environments or improved simulations flows.
Language: Английский
Citations
31
Applied Catalysis B Environment and Energy, Journal Year: 2025, Volume and Issue: unknown, P. 125019 - 125019
Published: Jan. 1, 2025
Language: Английский
Citations
1
Fuel, Journal Year: 2025, Volume and Issue: 388, P. 134598 - 134598
Published: Feb. 5, 2025
Language: Английский
Citations
1
Materials Today Catalysis, Journal Year: 2025, Volume and Issue: unknown, P. 100089 - 100089
Published: Feb. 1, 2025
Language: Английский
Citations
1
Small Methods, Journal Year: 2025, Volume and Issue: unknown
Published: Feb. 16, 2025
Abstract Electrocatalytic water splitting for hydrogen generation plays a crucial role in promoting the energy transition and achieving goals of carbon neutrality. Nevertheless, context electrolysis, generated bubbles have an adverse impact on consumption mass transfer efficiency. To address this challenge, variety strategies are investigated to accelerate bubble detachment transport. It is utmost significance summarize those facilitating advancement electrolysis performance. In review, comprehensive account presented enhancing performance through behavior management. First, electrolyte discussed. Then, optimized interactions between electrode surface introduced, which focus reducing adhesion forces implementing other forces. Next, dynamic bubbling deformable catalysts discussed, such as fern‐ caterpillar‐like catalysts. Following that, bubble‐bubble coalescence proved be beneficial earlier departure compared buoyancy effect alone. Finally, outlooks future development efficient removal enhanced The review aims deepen comprehension stimulate management strategies, thereby further electrolysis.
Language: Английский
Citations
1
ACS Catalysis, Journal Year: 2025, Volume and Issue: unknown, P. 3823 - 3835
Published: Feb. 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.
Language: Английский
Citations
1
Industrial & Engineering Chemistry Research, Journal Year: 2025, Volume and Issue: 64(9), P. 5087 - 5098
Published: Feb. 21, 2025
Gas bubble adhesion, a ubiquitous phenomenon in electrochemical gas-evolving reactions, reduces the hydrogen evolution reaction (HER) activity water electrolysis. Understanding dynamics of gas detachment and its dependence on force balance is crucial for manipulating departure, but it remains insufficiently investigated. Here, we found that differ markedly between fluidizable stationary electrocatalysts, with electrocatalysts minimizing adhesion showing 37-fold increase HER rate constant. This enhancement attributed to accelerated driven by fluidization effect electrocatalyst particles. Specifically, transition from marks shift flat particulate model, introducing promoting effects arising particle movement spin-induced centrifugal collision-triggered coalescence. Consequently, measured approaches intrinsic value. work highlights as an effective strategy eliminate thereby exposing nearly all active sites electrocatalytic reactions.
Language: Английский
Citations
1
ACS Applied Materials & Interfaces, Journal Year: 2025, Volume and Issue: unknown
Published: Feb. 26, 2025
Gas evolution plays an important role in water electrolysis, as sluggish bubble dynamics lead to blockage of active sites, reduced catalytic performance, and even detachment the catalysts. In this work, we present a strategy fabricate highly rough three-dimensional (3D)-printed Ni (3DPNi) electrodes with ordered flow channel structures, achieving exceptional performance through enhanced transport dynamics. The surfaces enhance hydrophilic aerophobic properties, suppressing coalescence accelerating structures 3DPNi serve efficient channels effectively prevent trapping, facilitating rapid Collectively, these features optimize dynamics, significantly boosting for electrolysis. Computational fluid simulations visual experiments validate improved When coated NiFe-LDH (NiFe-LDH/3DPNi), low overpotential 238 mV is required deliver 100 mA cm-2 OER. overall splitting, NiFe-LDH/3DPNi || Pt plate setup requires cell voltage 1.86 V achieve 1 A demonstrates excellent stability over h at current density, indicating strong potential practical applications.
Language: Английский
Citations
1
Physics of Fluids, Journal Year: 2024, Volume and Issue: 36(7)
Published: July 1, 2024
Bubbles generated during electrochemical water splitting could adhere to the electrode surface and therefore impede reaction. Thus, understanding manipulating evolution dynamics of bubbles is crucial for enhancing electrolysis efficiency. In this study, we investigated mechanism forces acting on individual hydrogen bubble Pt microelectrode by employing different H2SO4 electrolyte concentrations (0.2–1.0 M) under various applied voltages [−2 −6 V vs saturated calomel (SCE)]. We focused detachment diameter, average current, lifetime subsequently established relational equations over these variables. At SCE, growth coefficient has a maximum value 14.42 × 10−4 m/s0.333 when concentration around 0.6 M. Gas production at M increased 63.4% compared 0.2 11.2% 1.0 Therefore, choosing appropriate can maximize gas Additionally, force balance model incorporating Marangoni single was across varying electrolyte. −4 solutal starts dominate above 0.4 The results demonstrate critical role beyond certain concentration.
Language: Английский
Citations
6
International Journal of Hydrogen Energy, Journal Year: 2024, Volume and Issue: 74, P. 283 - 296
Published: June 14, 2024
Language: Английский
Citations
5