Silver/Nickel Oxide (Ag/NiO) Nanocomposites Produced Via a Citrate Sol-Gel Route as Electrocatalyst for the Oxygen Evolution Reaction (OER) in Alkaline Medium

One‐Pot Synthesis of Co3O4/Ag Nanoparticles Supported on N‐Doped Graphene as Efficient Bifunctional Oxygen Catalysts for Flexible Rechargeable Zinc–Air Batteries

“…This value is even lower than that of the commercial IrO 2 catalyst (442 mV). For the Ag/rGO sample, a much bigger overpotential (730 mV) is needed, indicating a poor OER activity, and the fluctuation of the OER LSV polarization curve at 1.5–1.6 V should be ascribed to the oxidation of silver . Figure e shows the mass specific actives of different samples at overpotentials of 500 and 600 mV, respectively.…”

“…For the Ag/ rGO sample, am uch bigger overpotential (730 mV) is needed, indicating ap oor OERa ctivity,a nd the fluctuation of the OER LSV polarization curve at 1.5-1.6 Vs hould be ascribed to the oxidation of silver. [22] Figure 4e shows the mass specific actives of different samples at overpotentials of 500 and 600 mV,r espectively.I tc an be seen that Co 3 O 4 /Ag@NrGO shows the highest mass specific activity among the four samples, which are 0.056 (h = 500 mV) and 0.087 mA mg À1 (h = 600 mV), respectively.W hereas,t he Ag/rGO sample shows the worst mass specific activity.F igure 4f shows the potentiald ifferences (DE)o f the four samples between E j = 10 and À3mAcm À2 ,a nd the smaller DE represents the betterb ifunctionality towards ORR and OER.I tc an be seen, among the four samples thatC o 3 O 4 / Ag@NrGO shows the smallest DE (0.93 V), which is also lower than those of similar catalysts recently reported in the literature (shown in Table 2). [23] In order to investigate the long-term stability of Co 3 O 4 / Ag@NrGO during the ORR, a4 0000 sc hronoamperometry (CA) test has been conducted at 0.4 V. The inset in Figure 5a shows the current retention curveso fC o 3 O 4 /Ag@NrGO and Pt/C catalysts during the CA tests.…”

Ce0.8Sr0.2CoxFe1‐xO3‐δ (x=0.2, 0.5, 0.8) – A Perovskite‐type Nanocomposite for Application in the Oxygen Evolution Reaction in Alkaline Media

“…The value at which the CV scan crossed the zero line gave the RHE‐value (0.91 V). All measurements were conducted at 25 °C [48]. …”

“…The value at which the CV scan crossed the zero line gave the RHEvalue (0.91 V). All measurements were conducted at 25°C [48].…”

Electrodes Based on Zeolites Modified with Cobalt and/or Molybdenum for Pesticide Degradation. Part I: Physicochemical Characterization and Efficiency of the Electrodes for O2 Reduction and H2O2 Production

“…Different oxides have been used as catalysts in electrode preparation [16,17]. Oxides of molybdenum, either alone or accompanied by cobalt, have been widely studied in heterogeneous catalysis and recently in electrocatalysis [18].…”