Highly electrocatalytic performance of bimetallic Co–Fe sulfide nanoparticles encapsulated in N-doped carbon nanotubes on reduced graphene oxide for oxygen evolution

Sodium Tartrate-Assisted Synthesis of High-Purity NiFe2O4 Nano-Microrods Supported by Porous Ketjenblack Carbon for Efficient Alkaline Oxygen Evolution

“…The catalyst containing Fe 2 O 3 and NiFe 2 O 4 as active components (i.e., prepared via the same route as NiFe 2 O 4 /KB but without sodium tartrate) showed an overpotential of 460 mV (vs RHE) at 10 mA cm −2 and a Tafel slope of 92.47 mV dec −1 (Figure S4), a significantly inferior performance compared to NiFe 2 O 4 /KB. Binary and ternary metal oxides frequently display far better OER performance than their monometallic oxide counterparts due to synergies between the active components, 29,46,64,65 consistent with the experimental results here. Further, our findings draw attention to the crucial role of the sodium tartrate-chelation strategy and the formation of a NiFe-MOF precursor in the creation of high-purity NiFe 2 O 4 nano-microrods in NiFe 2 O 4 /KB.…”

“…The C dl and j specific of NiFe 2 O 4 /KB were 1.45 and 1.06 times, respectively, the values determined for CoFe 2 O 4 /KB. The fact that the C dl difference was much greater than the j specific difference implied that the enhanced OER electrocatalytic activity of NiFe 2 O 4 /KB relative to CoFe 2 O 4 /KB was primarily due to the higher ECSA of NiFe 2 O 4 /KB. , …”

“…66 CoFe 2 O 4 /KB was primarily due to the higher ECSA of NiFe 2 O 4 /KB. 44,65 Next, electrochemical impedance spectroscopy (EIS) was performed on the catalysts to explore their charge transfer kinetics. EIS Nyquist plots along with the equivalent circuit are shown in Figure 5c.…”

Enhancement of the Photocatalytic Oxygen Production by Tantalum Nitride Supported Fe Atom Embedded N‐Doped Graphene Oxide†

“…A large number of bright spots of individual Fe atoms can be observed on the evenly dispersed surface of the NGO substrate by the HAADF–STEM technology, which prove that Fe atoms are dispersed in NGO after annealing in NH 3 (Figure 3d). [ 29,32 ] TEM images of 5 wt% Fe‐NGO/Ta 3 N 5 are shown in Figures 3e—3f, indicating the Ta 3 N 5 is dispersed on the large Fe‐NGO sheets. Figure 3g shows the HRTEM image of Fe‐NGO/Ta 3 N 5 nanosheets.…”

“…[ 29‐31 ] In addition, the electronic unsaturation on the local carbon skeleton is increased by doping metal heteroatoms, and more reactants and intermediate products are enriched. [ 32‐33 ] Therefore, the metal atom embedded in heteroatom‐doped GO can be used as a suitable cocatalyst to improve the efficiency of carrier migration and separation. [ 34‐36 ] At the same time, the adsorption and activation ability of the reactants are promoted.…”