CO₂‐Assisted Fabrication of Defect‐Engineered Carbon Nitride for Enhanced Electrocatalytic Hydrogen Evolution

Abstract

Here, a defect-engineered carbon nitride (DCN) electrocatalyst has been synthesized by directly annealing of a rationally designed urea precursor. The existence of defect sites was investigated by detailed characterizations. When loading a small amount of Ru nanoparticles, the obtained DCN catalyst offers excellent catalytic activity for electrochemical hydrogen evolution reaction.

Room-temperature dissolution of PbI2 by a PEGylated deep eutectic solvent with high efficiency

“…Note that during the water-regenerating process, some PbI 2 might be left in the DES, and some of the DES would bind with PbI 2 ; therefore, there are still some differences between the mass fractions of the regenerated PbI 2 and dissolved PbI 2 . Supercritical or compressed CO 2 38–40 might be an environmentally benign method to further purify the recovered PbI 2 , which would hypothetically still have some DES components left as impurities at 25 °C. Moreover, the water in the DES/water mixture could be removed for regeneration of the DES.…”

Advances in Carbon Nitride-Based Materials and Their Electrocatalytic Applications

“…The enhanced properties originated from the increased surface area and the abundant defect sites. 230 Mesoporous exfoliated nanocomposites of g-C 3 N 4 /NiO were fabricated. The samples reformed from an alcohol−water medium, and it was realized that the electro-chemical hydrogen evolution activity of the composite increased with the amount of nickel oxide.…”

“…At a current density of 10 mA cm –2 , the Ru-DCN electrocatalyst exhibited an overpotential of 51 mV and a Tafel slope of 59.5 mV dec –1 , which was smaller than that of Ru-CN. The enhanced properties originated from the increased surface area and the abundant defect sites . Mesoporous exfoliated nanocomposites of g-C 3 N 4 /NiO were fabricated.…”

Higher Fatty Acid-Based CO2-Controllable Dual-Circulation Approach for Oil Recovery

“…9,10 CO 2 is regarded as a new natural and harmless stimulant, which was also relevant to the study of greenhouse gas capture 11 and gas anti-solvent. 12,13 The CO 2 -responsive compounds had been diffusely applied into solid−liquid separation, 14 washing oil, 15 biotechnology, 16 extraction, 17,18 medicine, 19 and other multidisciplinary fields 20 in the form of compound solvent, 21 sol− gel, 22 and emulsion. 23 According to the preliminary estimate, there are rich unmanageable oiliness resources such as oily sludge 24 in the world.…”

“…The compounds with stimuli-responsive properties were discovered and synthesized early on, and stimuli-response of the compound was achieved through pH, light, temperature, enzyme, etc. Now, numerous CO 2 -responsive compounds have been prepared. , CO 2 is regarded as a new natural and harmless stimulant, which was also relevant to the study of greenhouse gas capture and gas anti-solvent. , The CO 2 -responsive compounds had been diffusely applied into solid–liquid separation, washing oil, biotechnology, extraction, , medicine, and other multi-disciplinary fields in the form of compound solvent, sol–gel, and emulsion …”