Unravelling the synergy of oxygen vacancies and gold nanostars in hematite for the electrochemical and photoelectrochemical oxygen evolution reaction

Ultra-low Ru doped MOF-derived hollow nanorods for efficient oxygen evolution reaction

“…6a, a positive shift of E d was observed in CoFe/ D-MOFs compared with CoFe-MOFs, suggesting that the O v defects were able to enhance the intermediate adsorption on the catalysts. 61 Besides, the E d value of Ru@CoFe/D-MOFs was calculated to be −3.27 eV, being 0.55 eV higher than that of CoFe/D-MOFs, which indicated that the E d value of CoFe/ D-MOFs has been further optimized by the doping of Ru 3+ . Such an effect can also be confirmed by the peak shifts from XPS results (Fig.…”

Heterostructured Core–Shell Ni–Co@Fe–Co Nanoboxes of Prussian Blue Analogues for Efficient Electrocatalytic Hydrogen Evolution from Alkaline Seawater

“…Figure e displays the Fe 2p edge spectra of the Fe-containing PBAs. It is observed that the relative content of Fe 3+ in Ni–Co@Fe–Co PBA is significantly increased compared with the other PBAs (Table S3), which is due to the oxidation of ferrous ions during the etching process . The prominent electron paramagnetic resonance (EPR) signal in Ni–Co@Fe–Co PBA at g = 2.005 compared to that of NiFe–Co PBA suggests that [Co III (CN) 6 ] 3– vacancies are generated due to the etching of ferrous ions in the encapsulation process­(Figure f) …”

“…It is observed that the relative content of Fe 3+ in Ni–Co@Fe–Co PBA is significantly increased compared with the other PBAs ( Table S3 ), which is due to the oxidation of ferrous ions during the etching process. 38 The prominent electron paramagnetic resonance (EPR) signal in Ni–Co@Fe–Co PBA at g = 2.005 compared to that of NiFe–Co PBA suggests that [Co III (CN) 6 ] 3– vacancies are generated due to the etching of ferrous ions in the encapsulation process( Figure 3 f). 39 Figure 3 g and Table S4 display the spider chart showing the structural and compositional parameters for comparison of Ni–Co@Fe–Co PBA and NiFe–Co PBA, which indicates that the rational design has a greater potential to enhance the performance of PBA-based electrocatalysts.…”

How titanium and iron are integrated into hematite to enhance the photoelectrochemical water oxidation: a review

“…, conductivity, energy level) and surface properties. 114 For hematite, the incorporation of oxygen vacancies has been widely utilized to promote the PEC activity with increased bulk donor density. Additionally, the oxygen vacancies have also been well coupled with Ti-based modifications to obtain a better PEC water oxidation performance.…”

“…Oxygen vacancies as a kind of intrinsic defects generally existed in different metal oxides (e.g., TiO 2 , ZnO, BiVO 4 , WO 3 , and Fe 2 O 3 ), which can greatly affect the bulk (e.g., conductivity, energy level) and surface properties. 114 For hematite, the incorporation of oxygen vacancies has been widely utilized to promote the PEC activity with increased bulk donor density. Additionally, the oxygen vacancies have also been well coupled with Ti-based modifications to obtain a better PEC water oxidation performance.…”