Dynamic active sites in NiFe oxyhydroxide upon Au nanoparticles decoration for highly efficient electrochemical water oxidation

Ceria-Promoted Reconstruction of Ni-Based Electrocatalysts toward Efficient Oxygen Evolution

“…The EIS and C dl fitted on these samples confirmed the fast charge-transfer rate and large active surface of CeO 2 -Ni 3 S 2 /NF (0.15) (Figures S24 and S25). In further comparison with recently reported Ni-based electrocatalysts, ,− CeO 2 -Ni 3 S 2 /NF performed among the best (Figure d), demonstrating the merit of this ceria-promotion strategy. Regarding the possible structural evolution of NF during OER, only the counterparts prepared on NF were taken into this comparison.…”

“…(c) Summary of η 10 and current density at Ni 2+ /Ni 3+ oxidation peaks of these CeO 2 -Ni 3 S 2 /NF. (d) Comparison of OER performance of optimized CeO 2 -Ni 3 S 2 /NF with recently reported Ni-based OER electrocatalysts that were fabricated on NF (ref samples: 1: NM50-Ni 3 S 4 /NF, 2: Au@Ni­( Fe )­OOH-NF, 3: Ni 3 S 2 /MnO 2 -NF, 4: NiO/Co 3 O 4 -NF, 5: Ni 3 S 4 /NF, 6: Co-Ni 3 N/NF, 7: Ni 3 N-Co 3 N/C@NF, 8: Ni 3 S 2 @NGCLs/NF, 9: NiFe-LDH@MnCO 3 /NF, 10: LDH-MOF@NF, 11: Mo-NiCo 2 O 4 /NF, 12: NiCo 2 O 4 @CoS/NF, 13: (Ni 0.90 Cr 0.10 ) 2 P/NF, 14: Ni 3 S 2 @Ni/NF, 15: La­(CrMnFeCo 2 Ni)­O 3 /NF). (e) Repeated CVs and (inset of e) a chronoamperometry test (η = 300 mV) of CeO 2 -Ni 3 S 2 /NF in 1.0 M KOH.…”

Interfacial engineering and chemical reconstruction of Mo/Mo2C@CoO@NC heterostructure for promoting oxygen evolution reaction

“…The electrochemical surface area (ECSA) was also calculated to identify the quantity and intrinsic activity of active sites as well as electrical conductivity. 53 As shown in Fig. 4c, Mo/Mo 2 C@CoO@NC achieves the highest C dl value (5.9 mF cm −1 ) and ECSA (147.5), higher than those of RuO 2 (5.6 mF cm −2 , 140), ZIF-67-HT (2.8 mF cm −2 , 70), and MoO 3 -HT (0.25 mF cm −2 , 6.25).…”

Ultrafast preparation of NiFe nanocluster/graphene heterojunction catalysts for oxygen evolution reaction and urea oxidation reaction

“…, where M 2+ is a divalent metal ion, M 3+ is a trivalent metal ion, and A n− is the interlayered anion. [18][19][20][21][22][23] In its early years, the research on transition metals for OER catalysts in alkaline environment mainly focused on nickel and nickel-based oxides. In 1987, Corrigan et al found that adding an ultra-low concentration of Fe obviously ameliorated the OER performance of nickel oxide: the combination of Ni and Fe as impurities in Ni(OH) 2 reduces the overpotential of OER in alkaline solution.…”