Enhancing CO₂ reduction by suppressing hydrogen evolution with polytetrafluoroethylene protected copper nanoneedles

Abstract

Enhanced carbon dioxide reduction reaction (CO2RR) with suppressed HER was achieved on polytetrafluoroethylene (PTFE) coated Cu nanoneedles (CuNNs).

Paired Ru‒O‒Mo ensemble for efficient and stable alkaline hydrogen evolution reaction

“…Theoretical calculations performed with first-principle simulations predict that the engineering of Ru-O-Mo sites enhances H2O absorption. [25][26][27][28][29] We experimentally prepare Ru/MoO2 catalyst with paired Ru-O-Mo sites through a facile hydrothermal reaction with a pyrolysis process on a graphite carbon substrate (Figure 2a). Details on the manufacturing process are in the Supporting Information.…”

Mechanisms beyond energetics revealed by multiscale kinetic modeling of 2D‐material growth and nanocatalysis

“…Based on similar multiscale modeling and simulations, it was found that the enhancement stems from regulation of the surface reactant flux by the gradient of the local electric field directing uniformly to the nearest catalyst on ordered patterns, so that the kinetics was optimized to enrich the local concentration of reactant molecules for reactions. Furthermore, the mechanism has also been verified in electroreduction of CO 2 on high curvature transition metal chalcogenide nanostructures, 82,83 Cu@Bi nanocones, 84 sharp Cu@Sn nanocones on Cu foam, 85 Cu‐based heterogeneous electrocatalysts, 86 sharp tipped zinc nanowires, 87 polytetrafluoroethylene protected copper nanoneedles, 88 fluorine doped cage‐like carbon electrocatalysts, 89 nickel‐nitrogen‐modified porous carbon/carbon nanotube hybrid with necklace‐like geometry, 90 as well as sharp‐tip enhanced catalytic CO oxidation by atomically dispersed Pt1/Pt2 on a raised graphene oxide platform 91 and electrocatalytic hydrogen evolution on atomically dispersed platinum supported on curved carbon supports 92 …”

Promoting CO2 electroreduction on CuO nanowires with a hydrophobic Nafion overlayer

“…Similarly, hydrophobic PTFE treated Cu nanoneedles (Cu NNs) achieved highly suppressed HER activity and high selectivity for C 2 products. 25 Inspired by previous works, we accidentally found that a Nafion overlayer, a sulfonated fluoropolymer which has been widely used as an organic binder or a proton exchange membrane, could form a uniform overlayer on the CuO nanowire electrode and endow it with hydrophobicity. The obtained hydrophobic electrode (CuO-Nafion) exhibited enhanced CO 2 RR selectivity and suppressed HER activity compared to the bare CuO nanowire electrode.…”