Chemical Communications, Год журнала: 2025, Номер unknown
Опубликована: Янв. 1, 2025
In situ Raman spectroscopy used for monitoring the electrocatalytic process reveals hydrogen evolution reaction mechanism, providing theoretical guidance fabricating efficient catalysts.
Язык: Английский
ACS Applied Materials & Interfaces, Год журнала: 2025, Номер unknown
Опубликована: Янв. 27, 2025
This paper describes the production and high-current-density hydrogen evolution reaction (HER) performance in whole pH range (from acidic to basic values) of self-supported α-MoB/β-MoB2 ceramic electrodes, aiming for use industrial electrocatalytic water splitting. Tape-casting phase-inversion process, followed by sintering, were employed synthesize β-MoB2 which exhibited well arranged large finger-like pores, providing numerous active sites channels electrolyte entry release. The between sintering aid MoO3 situ produces heterojunctions, significantly improve performance. At a current density 1000 mA·cm-2, electrode manifested an overpotential 289 mV 294 alkaline aqueous solutions, respectively, stable operation over time (>100 h). also performed neutral solution, with 354 at 100 mA·cm-2. Theoretical (DFT) calculations demonstrated that heterojunction alters electronic configuration β-MoB2, favoring effective electron transfer mechanism; thereby, adsorption free energy ions is close zero, dissociation molecules under conditions are enhanced.
Язык: Английский
Процитировано
1
Nature Reviews Chemistry, Год журнала: 2025, Номер unknown
Опубликована: Фев. 5, 2025
Язык: Английский
Процитировано
1
Nano Letters, Год журнала: 2025, Номер unknown
Опубликована: Апрель 14, 2025
The advancement of water electrolysis highlights the growing importance electrolyzers capable operating at high current densities, where mass transfer dynamics plays a crucial role. In electrode reactions, interfacial is key factor in regulating these dynamics. However, potential utilizing interfacial-free (IFW) to modulate behavior remains underexplored. Herein, we investigate effect structure on hydrogen evolution reaction (HER) performance across different density ranges, using designed platinum-coated nickel hydroxide foam (Pt@Ni(OH)2-NF) electrodes. We reveal that with increasing density, changes alter rate-determining step HER. Pt@Ni(OH)2-NF exhibited excellent alkaline electrolytes, achieving 1000 mA cm-2 114 mV overpotential. This study provides novel approach optimizing by enhancing transfer, further paving way for more efficient and energy-saving production.
Язык: Английский
Процитировано
1
Journal of the American Chemical Society, Год журнала: 2025, Номер unknown
Опубликована: Апрель 11, 2025
Replacing the oxygen evolution reaction (OER) in CO2 electrolysis with an energetically and economically favorable alternative is very promising. Yet, understanding paired organic oxidation environment for reduction particularly challenging, as monitoring multiple side reactions problematic. Herein, we examined of ethylene glycol (EG), one simplest polyols, a model on series nickel oxyhydroxide catalysts (β-NiMxOOH, M = Ni, Co, Fe, Cu). Using situ techniques, including surface-enhanced infrared absorption spectroscopy (SEIRAS) differential electrochemical mass spectrometry (DEMS), together various ex approaches, obtained potential-resolved quantitative information comprising OER, overoxidation to CO/CO2, catalyst dissolution, from electrolyte decarbonation. Many factors impurity cations, pH, potential can substantially influence product distribution reactions. Such influences are nearly identical both electrocatalytic chemical-electrochemical pathways. The optimized system achieve stable high Faradaic efficiencies formate (∼100%), glycolaldehyde (∼86%), glycolate (∼66%), respectively. Importantly, easily suffer higher energy consumption than conventional counterpart, provided unregulated. Yet modulated consumed 21.1% less even when separation was considered. This work reveals unique electrolysis, opening up opportunities designing efficient systems real-life applications.
Язык: Английский
Процитировано
0
Analytical Chemistry, Год журнала: 2025, Номер unknown
Опубликована: Май 13, 2025
In aqueous electrochemistry, water in contact with charged surfaces is ubiquitous and indispensable, dictating the binding of solutes to electrode as well transport process protons electrons interfacial region. A comprehensive understanding structure dissociation at molecular level extremely important yet challenging, given its critical role various physical, chemical, biological processes. situ vibrational spectroscopic techniques serve a powerful tool for acquiring probing reaction mechanisms real time. this review, we briefly summarize latest advances electric double layer model experimental methods employed electrode-solution interface. Particular emphasis placed on that have unveiled new insights into across diverse under ambient conditions. And then, it also provides an overview recent progress subtle relationship between activity, aiming provide novel fields energy catalysis.
Язык: Английский
Процитировано
0
Chemical Communications, Год журнала: 2025, Номер unknown
Опубликована: Янв. 1, 2025
In situ Raman spectroscopy used for monitoring the electrocatalytic process reveals hydrogen evolution reaction mechanism, providing theoretical guidance fabricating efficient catalysts.
Язык: Английский
Процитировано
0