Binary electrocatalyst composed of Mo2C nanocrystals with ultra-low Pt loadings anchored in TiO2 nanotube arrays for hydrogen evolution reaction

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

“…The change of oxygen vacancies was attributed to the surface reconstruction of metal oxide catalysts induced by electrochemical stability tests, where some metal atoms were oxidized and detached from the lattice, creating surface oxygen vacancies and increasing their content (Figure S8). The prepared Pt/ Vo-TiO 2 has a low Tafel slope and overpotential, significantly better than the recently reported Pt-based and TiO 2 -based catalysts ,,− (Figure f and Table S3).…”

Activation of Osmium by the Surface Effects of Hydrogenated TiO2 Nanotube Arrays for Enhanced Hydrogen Evolution Reaction Performance

“…The resulting chemical bonds can prevent particle migration, agglomeration, and detachment and enhance the intrinsic activity of metal centers in the vicinity of the metal–support interface. Self-ordered TiO 2 nanotube (TNT) arrays prepared by anodic oxidation have recently received increased attention as catalyst supports in HER electrocatalysis due to their three-dimensional structure, corrosion resistance in harsh acidic and alkaline conditions, environmental friendliness, and low cost. − The most prominent electrochemical feature of TNT arrays is their potential-adjustable conductivity. Specifically, at potentials higher than ∼0.6 V versus RHE, TNTs are in a low-doped state and show a typical n-type semiconducting behavior, which is manifested in inhibited current flow.…”

MOF-Derived Sulfide-Based Electrocatalyst and Scaffold for Boosted Hydrogen Production

“…1,2 To achieve an efficient HER, electrocatalysts with high performance are needed to ensure low overpotential and high stability during the water reduction process. 3,4 However, many reported HER electrocatalysts possess relatively poor activities in alkaline electrolyte, due to slow kinetics of water decomposition. 5,6 It is widely believed that the HER process involves water dissociation (Volmer step: H 2 O + e − → H ad + OH − ) and H 2 formation (Heyrovsky step: H 2 O + H ad + e − → H 2 + OH − ; or Tafel step: 2 H ad → H 2 ).…”

“…The alkaline hydrogen evolution reaction (HER) is essential to hydrogen generating energy technologies, e.g., water splitting under alkaline conditions. , To achieve an efficient HER, electrocatalysts with high performance are needed to ensure low overpotential and high stability during the water reduction process. , However, many reported HER electrocatalysts possess relatively poor activities in alkaline electrolyte, due to slow kinetics of water decomposition. , It is widely believed that the HER process involves water dissociation (Volmer step: H 2 O + e – → H ad + OH – ) and H 2 formation (Heyrovsky step: H 2 O + H ad + e – → H 2 + OH – ; or Tafel step: 2 H ad → H 2 ). , A major difference between the HER in acidic and alkaline media is that the process dynamics are determined by the Volmer step in the latter . In 2016, Strmcnik et al reported enhanced alkaline HER activities of noble metal-based catalysts through electrodeposition of 3D metal hydroxide (M-OH) on Pt in which M-OH provided unique active sites to boost the water dissociation step (Volmer step) .…”