Selective formation of hydrogen peroxide by oxygen reduction on TiO2 nanotubes in alkaline media

Carbon Free and Noble Metal Free Ni2Mo6S8 Electrocatalyst for Selective Electrosynthesis of H2O2

“…The mass-transport corrected kinetic current density for H 2 O 2 production (j k , H 2 O 2 ) on the Ni 2 Mo 6 S 8 catalyst was estimated using the Koutecky-Levich equation and is 1.5 mA cm −2 at 0.53 V versus RHE, which is comparable or even better than the state-of-the-art nanocluster and single atom-based electrocatalysts and electrocatalysts based on noble and/or toxic metals, demonstrating superior activity of Ni 2 Mo 6 S 8 for H 2 O 2 synthesis (Figure 4e, Table S2, Supporting Information). [26][27][28][29][30][31] Furthermore, we estimate the TOF for H 2 O 2 formation by assuming Ni is the only active site and all exposed Ni 2 Mo 6 S 8 surface is active. The surface density of Ni active site was estimated as 1.64 × 10 14 cm −2 using the crystal facet model illustrated in Figure 1b (2 Ni sites per Mo 6 S 8 cluster).…”

“…The data that support the findings of this study are available from the corresponding author upon reasonable request. [11] and Pd-Au NPs; [26] and alkaline electrocatalysts Ni-N 2 O 2 /C, [27] CNTs, [9a] Fe 3 O 4 /G, [28] TiO 2 , [29] Au NC, [30] Co-CNT, and Fe-CNT. [31]…”

Progress Towards Direct Hydrogen Peroxide Fuel Cells (DHPFCs) as an Energy Storage Concept

“…A wide variety of electrochemical catalysts have been found to reduce O 2 to H 2 O 2 with a greater or lesser degree of specificity, including TiO 2 particles, [44] platinum, [45][46][47] manganese oxides, [48,49] iron oxides, [50] metal alloys such as Pd/ Au [51] and Pt/Hg, [52] copper complexes, [53] cobalt oxides [54][55][56][57] and boron-or nitrogen-doped carbon materials. [58][59][60] The design of the electrocatalyst is important, as the competing four-electron O 2 reduction to H 2 O: [61][62][63]…”

SnO2-supported single metal atoms: a bifunctional catalyst for the electrochemical synthesis of H2O2

“…Similar to the WOR, the production of H 2 O 2 via the 2e-ORR over metal oxides have been studied as green, cost-effective catalyst materials. 19–26 Earlier reports by Abbott et al showed the selective and active O 2 conversion to H 2 O 2 over RuO 2 and Ru 1− x M x O 2 (M = Co, Ni, Zn) electrocatalysts, with calculated limiting potentials ( U L ) of ≈0.60 V. 26 Following this, various strategies have been implemented in the design of metal oxide ORR catalysts. For instance, nano-structuring of metal oxides as in TiO 2 nanotubes and nanoparticles or loading metal oxides such as Ni-based layered double hydroxide and CeO 2 on a conductive, carbon support.…”

“…For instance, nano-structuring of metal oxides as in TiO 2 nanotubes and nanoparticles or loading metal oxides such as Ni-based layered double hydroxide and CeO 2 on a conductive, carbon support. 22–25 These approaches have led to highly active ( U L ≈ 0.40 V) and selective (FE > 95%) metal oxide-based electrocatalysts.…”