Influence of Nitrogen-Doped Carbon Quantum Dots on the Electrocatalytic Performance of the CoP Nanoflower Catalyst for OER

Abstract

Cobalt phosphides modified by nitrogen-doped carbon quantum dots (CoP−NCQDs) were successfully constructed by a facile and low-cost hydrothermal treatment, which is expected to replace traditional noble-metal oxygen evolution reaction electrode materials. Detailed experiments and findings show that nitrogen-doped carbon quantum dots (NCQDs) have a significant impact on the morphology of the CoP catalyst, and nitrogen doping can regulate the surface-active sites to obtain the catalyst with abundant structural defects. Simultaneously, nitrogen doping can regulate the content of pyridinic N and pyrrolic N, which exerts positive effects on the formation of the bond structure and electron conduction between NCQDs and CoP.

Crystalline–Amorphous Interface Coupling of Ni3S2/NiPx/NF with Enhanced Activity and Stability for Electrocatalytic Oxygen Evolution

“…Figure c uncovers the existence of the P–O bond in Ni 3 S 2 /NiP x /NF and NiP x /NF, which is consistent with previous work . The 2p 3/2 and 2p 1/2 orbitals of the P–M bond are located at 129.73 and 130.98 eV for Ni 3 S 2 /NiP x /NF. , The peak positions of P–O and P–M bonds in Ni 3 S 2 /NiP x /NF are almost the same as those of NiP x /NF, proving that a similar form of P exists in Ni 3 S 2 /NiP x /NF as well as NiP x /NF obtained by electrodeposition. The S 2p orbitals of Ni 3 S 2 /NiP x /NF after deconvolution revealed S–O, S 2p 3/2 , and S 2p 1/2 , which are noticed at 162.39, 163.69, and 167.47 eV, respectively, as displayed in Figure d, agreeing well with the previous work on Ni 3 S 2 . , However, the S 2p spectrum of Ni 3 S 2 /NiP x /NF shows a weaker signal than that of Ni 3 S 2 /NF, in which the intensity of the S–M bond decreases significantly due to the deposition of a thick amorphous NiP x outer layer on the sulfide layer.…”

MOF-Derived Cobalt@Mesoporous Carbon as Electrocatalysts for Oxygen Evolution Reaction: Impact of Organic Linker

“…This contributes to the settlement of the global warming problem and reduces the demand for fossil fuels. − The oxygen evolution reaction (OER) is a half-reaction in the water electrolysis process. It is widely regarded as the main barrier to efficient water electrolysis for large-scale hydrogen production. , …”

“…It is widely regarded as the main barrier to efficient water electrolysis for large-scale hydrogen production. 8,9 In water splitting, electrocatalysts are required to accelerate the OER and HER. Heretofore, IrO 2 and RuO 2 , and other precious metal-based electrocatalysts, are known as pioneering OER catalysts.…”

Advances in carbon quantum dot technology for food safety: preparation, modification, applications and mechanisms

“…Wang et al [64] prepared nitrogen-doped CQDs with citric acid as carbon precursor and glutathione as nitrogen source for the sensitive detection of Cu 2+ , and achieved a detection limit of 0.27 nM with the range 0.20∼200.0 μM. Wu et al [65] used citric acid and urea as raw materials to prepare nitrogen-doped CQDs by a hydrothermal method. The CoP-NCQD nanoflowers obtained were used as catalysts in the anodic oxygen evolution reaction to achieve high-efficiency catalysis.…”