Bifunctional Mo4O11 Nanosheets-Engineered Co-Ni alloy nanowires enable High-Efficiency seawater electrolysis and Zn-Seawater battery

Trimetallic FeNiMo Nanofibers as High-Efficiency Electrocatalyst for Robust Oxygen Evolution

“…In the narrow-scan Ni 2p spectrum (Figure b), the peaks at 853.1 and 870.0 eV are attributed to Ni 0 2p 3/2 and 2p 1/2 , indicating the existence of metallic Ni. ,, The binding energies at 856.2 and 874.1 eV indicate Ni 2+ 2p 3/2 and Ni 2+ 2p 1/2 , respectively. ,, The satellite peaks can be observed at 862.0 and 879.8 eV. The high-resolution Mo 3d spectrum of Fe 0.125 Ni 0.375 Mo 0.5 NFs (Figure c) can be fitted with four peaks at 230.4, 233.6, 232.6, and 235.6 eV, which are ascribed to Mo 4+ 3d 5/2 , Mo 4+ 3d 3/2 , Mo 6+ 3d 5/2 , and Mo 6+ 3d 3/2 , respectively. − This result illustrates that the surface of the Fe 0.125 Ni 0.375 Mo 0.5 NFs is partially oxidized, in agreement with previous reports. , The appearance of Mo 2+ in Fe 0.2 Mo 0.8 is related to the multivalent of Mo oxides. , To clarify the electronic effect of the introduced elements in Fe 0.125 Ni 0.375 Mo 0.5 NFs, the difference in the characteristic peak position between the binary and ternary samples is investigated. Obviously, the addition of Mo species in the ternary Fe 0.125 Ni 0.375 Mo 0.5 NFs brings a lower binding energy of Fe and a higher peak location of Ni relative to Fe 0.25 Ni 0.75 , which demonstrates a changed charge density between Ni and Fe, and the electron transfer from Ni to Fe.…”

“…52,53 It has been reported that multivalent Mo 4 O 11 nanosheets coupling with Co−Ni components require an overpotential of 180 mV to reach 100 mA cm −2 for the OER in 1 M KOH and can maintain for 30 h at this current density. 52 Obviously, the integration of an alloy with a Mo-based oxide is a promising strategy to achieve highly efficient OER catalysts. However, it is still challenging to fabricate nanofibrous metallic alloy/MoO x composite nanostructures with high intrinsic active sites and superior electron/ mass transfer property as OER catalysts to present superior activity and stability.…”

“…65,66 The appearance of Mo 2+ in Fe 0.2 Mo 0.8 is related to the multivalent of Mo oxides. 43,52 To clarify the electronic effect of the introduced elements in ), demonstrating a faster kinetics and higher intrinsic electrocatalytic activity (Figure 3c). 71 The outstanding performance of the Fe 0.125 Ni 0.375 Mo 0.5 NFs sample has also been confirmed by comparison with that of recently reported OER catalysts (Figure 3d and Table S3).…”

“…To solve this problem, great efforts have been made in the fabrication of alloy/oxide composites to improve the activity and stability of electrocatalysts. Mo oxides has a variety of valences, which can be integrated with alloy to improve the electron distribution to enhance the overall electrocatalytic performance. , It has been reported that multivalent Mo 4 O 11 nanosheets coupling with Co–Ni components require an overpotential of 180 mV to reach 100 mA cm –2 for the OER in 1 M KOH and can maintain for 30 h at this current density . Obviously, the integration of an alloy with a Mo-based oxide is a promising strategy to achieve highly efficient OER catalysts.…”