Nickel enhanced the catalytic activities of amorphous copper for the oxygen evolution reaction

Abstract

Rice-like NiCuOx nanoparticles, fabricated via a one-step method, exhibit enhanced electrocatalytic activity and stability towards the OER.

Nickel Foam‐Supported Amorphous FeCo(Mn)−O Nanoclusters with Abundant Oxygen Vacancies through Selective Dealloying for Efficient Electrocatalytic Oxygen Evolution

“…Co 2p spectra of FeCo(Mn)−O/NF are deconvoluted into three groups of characteristic signals at 780.8 eV, 782.7 eV and 786.7 eV (satellite peak) for 2p3/2 as well as 796.8 eV, 798.1 eV and 803.0 eV (satellite peak) for 2p1/2 (Figure d), suggesting the coexistence of Co 3+ and Co 2+ . The O 1s region of FeCo(Mn)−O/NF exhibits four BEs at 529.9 eV, 530.9 eV, 531.5 eV and 532.0 eV (Figure e), which can be assigned respectively to lattice oxygen (O lat ), defective oxygen (O def ), metal hydroxide and absorbed water . Notably, the peak area ratio for O def and O lat in the FeCo(Mn)−O/NF is almost four times higher than that in the FeCoMn/NF (4.89 vs. 1.21).…”

“…In particular, defect engineering has very recently emerged as one of most effective and versatile strategies for the performance enhancement. The well‐designed structural defects can not only create highly active sites for water adsorption and activation, but also supply spatially channels for mass and electron transfer . Up to date, selective dissolution, chemical solution/vapor reduction as well as plasma or flame‐engraving techniques have been subsequently adopted to fabricate diversiform interface deficiencies and oxygen vacancies.…”

“…[36,37] The O 1s region of FeCo (Mn)À O/NF exhibits four BEs at 529.9 eV, 530.9 eV, 531.5 eV and 532.0 eV (Figure 3e), which can be assigned respectively to lattice oxygen (O lat ), defective oxygen (O def ), metal hydroxide and absorbed water. [10,17,[38][39][40] Notably, the peak area ratio for O def and O lat in the FeCo(Mn)À O/NF is almost four times higher than that in the FeCoMn/NF (4.89 vs. 1.21). The increased ratio indicates more oxygen vacancies are generated through freecorrosion dealloying of the precursor, [15,20,21] which is further confirmed by photoluminescent spectroscopy.…”

“…The well-designed structural defects can not only create highly active sites for water adsorption and activation, but also supply spatially channels for mass and electron transfer. [10] Up to date, selective dissolution, [11][12][13] chemical solution/vapor reduction [14][15][16][17] as well as plasma or flame-engraving techniques [18,19] have been subsequently adopted to fabricate diversiform interface deficiencies and oxygen vacancies. For example, the abundant oxygen deficiencies in ultrathin metal hydr(oxy)oxides nanosheets have well-tailored the coordination environment and electronic structure of the coordinately unsaturated metal sites.…”

Recent Progress on Multimetal Oxide Catalysts for the Oxygen Evolution Reaction

“…Therefore, special attention has been paid to the development of synthetic methods that enable the composition control with a homogeneous distribution of elements. Such synthesis methods include electrodeposition, [29,93,[150][151][152][153][154][155] photochemical metal-organic deposition (PMOD), [156][157][158][159][160] aerosol-sprayassisted processes, [161,162] reactive magnetron co-sputtering, [163] solvothermal processes, [164] and thermal decomposition. [165] …”