Vacancy and doping engineering of Ni-based charge-buffer electrode for highly-efficient membrane-free and decoupled hydrogen/oxygen evolution

Pyridinic-N Regulated Electron Injection to Modulate *OH Adsorption at Fe–N–C Sites for an Efficient Oxygen Reduction Reaction

“…This intricate porous framework, characterized by a multimodal distribution of meso/micropores, enhances the abundance of accessible active sites and facilitates efficient mass transport within the catalyst layer. , To evaluate the surface-wetting characteristics, contact angle measurements were performed . Fe SA @NC demonstrates heightened hydrophilicity with a contact angle of 13° compared to Fe SA @NC-4 at 21°, enhancing active site accessibility to the surrounding electrolyte as depicted in Figure S8 . Raman spectroscopy analysis of Fe SA @NC reveals distinctive peaks at 1347 and 1572 cm –1 with an I D / I G ratio of 1.59 (Figure S9), indicating a higher degree of structural defects than Fe SA @NC-4 ( I D / I G = 1.51) and NC ( I D / I G = 1.33).…”

“…45 Fe SA @NC demonstrates heightened hydrophilicity with a contact angle of 13°compared to Fe SA @NC-4 at 21°, enhancing active site accessibility to the surrounding electrolyte as depicted in Figure S8. 46 Raman spectroscopy analysis of Fe SA @NC reveals distinctive peaks at 1347 and 1572 cm −1 with an I D /I G ratio of 1.59 (Figure S9), indicating a higher degree of structural defects than Fe SA @NC-4 (I D /I G = 1.51) and NC (I D /I G = 1.33). This elevated I D /I G ratio substantiates the substantial influence of densely incorporated nitrogen species in inducing defects within the carbon matrix.…”

Breaking boundaries: advancements in solid-state redox mediators for decoupled water electrolysis

“…Chen's group and Hu's group further confirmed experimentally combined with density functional theory calculations that cobalt doping not only improves the conductivity of the charge buffer electrode, but also enhances the ability to adsorb OH − from the electrolyte. 88,89 The powerful affinity of OH − facilitates the capture of electrolyte ions and the formation of fast redox reaction kinetics, far superior to the undoped Ni(OH) 2 electrode. 90…”

A macroporous carbon nanoframe for hosting Mott–Schottky Fe–Co/Mo2C sites as an outstanding bi-functional oxygen electrocatalyst

“…The escalating environmental pollution and surging energy consumption have accelerated the inevitable transition from traditional fossil fuels to green energy conversion and storage technologies. 1,2 As a typical representative, the Zn–air battery (ZAB) is regarded as a promising next-generation energy conversion device due to its high theoretical energy density, low manufacturing cost, and enhanced safety. 3,4 However, the reversible oxygen electrocatalysis process is complex and involves multiple electron transfer steps, including a sluggish oxygen reduction reaction (ORR) and oxygen evolution reaction (OER).…”