Platinum Species on Oxygen Vacancy-Rich Titania for Efficient Basic Electrocatalytic Hydrogen Evolution

Controlled Synthesis of MoNi4 Ultrathin Nanosheet Arrays as an Efficient Bifunctional Electrocatalyst for Urea-Assisted Hydrogen Production

“…Notably, the charge-transfer resistance ( R ct ) of 8-MoNi 4 /NF was 10.40 Ω, which was significantly lower than that of 8-Mo/NF without MoNi 4 (52.30 Ω), indicating a higher charge transfer rate at the electrode–electrolyte interface. Consequently, the electron transport from the catalyst surface to the reactant in the electrolyte was more favorable in this case. , Furthermore, the stability of the synthesized 8-MoNi 4 /NF catalyst was investigated through chronopotentiometry tests in addition to its exceptional catalytic activity. The catalytic activity exhibited a marginal decline after 200 h of uninterrupted electrocatalysis at 100 mA cm –2 , thus confirming its remarkable stability (Figure f).…”

“…Consequently, the electron transport from the catalyst surface to the reactant in the electrolyte was more favorable in this case. 58,59 Furthermore, the stability of the synthesized 8-MoNi 4 /NF catalyst was investigated through chronopotentiometry tests in addition to its exceptional catalytic activity. The catalytic activity exhibited a marginal decline after 200 h of uninterrupted electrocatalysis at 100 mA cm −2 , thus confirming its remarkable stability (Figure 5f).…”

Ir Nanoparticles Supported on Oxygen-Deficient Vanadium Oxides Prepared by a Polyoxovanadate Precursor for Enhanced Electrocatalytic Hydrogen Evolution

“…Due to the interleaving of various vanadium oxide compounds in V x O y /C atoms and the presence of simultaneous oxygen vacancies, electron enrichment occurs at the Ir–V x O y active site. , During the reaction process, more electrochemically accessible Ir active sites are effectively added, which is conducive to accelerating the initial hydrolytic ionization, accelerating the formation of adsorbed hydrogen atoms (H ads ) by H + (OH – ), and weakening the binding strength of hydrogen with the Ir catalytic site due to charge sharing, thus facilitating rapid desorption of hydrogen. This process promotes the Volmer and Tafel processes, achieving a good balance between the catalyst’s adsorption and desorption capabilities toward hydrogen atoms, thereby successfully reducing the activation energy and hydrogen evolution overpotential of the HER. − The XPS spectra of Ir/V x O y /C after the HER test are shown in Figure e–h. The Ir spectrum moves toward low binding energy, while the binding energy of vanadium moves to the higher direction, indicating the electron transfer from V x O y to Ir/Ir 4+ , resulting in an increase in the electron cloud density of Ir which accelerates the hydrogen reduction.…”

Interface Engineering of PtZn Alloy and Nb2O5 for Promoting Ammonia Oxidation Reaction and Hydrogen Evolution Reaction

“…Nb 2 O 5 is proven to have excellent adsorption capability for OH ad . , In addition, Nb 2 O 5 is the most thermodynamically stable state among niobium oxides due to the highest valence state of Nb, which has good corrosion resistance. Nb 2 O 5 can alleviate the migration and agglomeration of metal particles to improve stability by strengthening its interaction with metal nanoparticles. , Furthermore, the regulation of the interface may also lead to electronic interaction between the components, optimizing the adsorption strength of reaction intermediates . Indeed, constructing the interface with Nb 2 O 5 is an effective method to improve HER activity under alkaline conditions by enhancing the water dissociation ability. , Consequently, introducing Nb 2 O 5 is beneficial for the construction of bifunctional catalysts for ammonia electrolysis, which can simplify the manufacture and reduce the production cost of the electrolyzer. , …”