Ordered Vacancies on the Body-Centered Cubic PdCu Nanocatalysts

Abstract

Defect engineering has become one of the important considerations in today's electrocatalyst design. However, the vacancies in the ordered crystal structure (especially body-centered cubic (bcc) and the effect of ordered vacancies (OVs) on the electronic fabric have not been researched yet. In this work, we report the inaugural time of the generation of OVs in the bcc architecture and discuss the insight of the modulation system of the material and its part in the electrochemical N 2 reduction reaction (NRR). OV-PdCu-2 achieves the highest Faradaic efficiency value of 21.5% at 0.05 V versus RHE. When the potential increases to 0 V versus RHE, the highest ammonia yield is 55.54 μg h −1 mg cat −1 , which is significantly better than the unetched PdCu nanoparticles (12.83 μg h −1 mg cat −1

Surface defect-regulated PdCu/TiO2−x promoting efficient electrocatalytic nitrogen reduction

“…The 0.352 nm lattice spacing corresponds to the (101) crystal plane distance of anatase phase TiO 2 , while the 0.217 nm lattice spacing corresponds to the (111) crystal plane distance of the face-centered-cubic (FCC) PdCu alloy, verifying the synthesis of FCC PdCu alloy nanoparticles. 50,51 STEM-EDS mapping images (Fig. 2(e and f)) show that Pd and Cu elements are evenly dispersed on the supports.…”

“…At −0.1 V vs. RHE, the NH 3 yield rate of Pd 1 Cu 1 /TiO 2− x -400 is 3.0 and 8.7 times higher than that of Pd/TiO 2− x -400 and Cu/TiO 2− x -400, while the faradaic efficiency increases by 6.4 and 1.7 times, respectively. We infer that Cu, as an effective HER inert metal, effectively accelerates the desorption of hydrogen so that the metal active sites cannot be covered and poisoned by hydrogen, 50,51 inhibiting the HER competition reaction. Therefore, the electronic structure and synergistic effect between bimetals can be regulated and optimized by constructing reasonable composition and proportion of the bimetal PdCu alloy, so as to effectively promote intrinsic catalytic activity.…”

“…S12 and Table S5, ESI †). 16,19,27,[34][35][36][37][38]50,51 Notably, once the applied potentials fall below À0.1 V vs. RHE, the faradaic efficiency decreases sharply, which is attributed to the rapid increase of the competitive HER in an acidic electrolyte. In addition, only NH 4 + was detected in the electrolytes obtained at all potentials, but no N 2 H 4 was detected (Fig.…”

High entropy stabilizing lattice oxygen participation of Ru- based oxides in acidic water oxidation

“…S4 †). 46,47 In addition, technically, a high performance OER electrocatalyst must support high volume synthesis and have good processing properties. We increased the concentration of reactants 50 times to prepare RuNiMoCrFeO x /CNT and the nal product mass produced was 1.18 g (Fig.…”

Surface-Regulated Platinum–Copper Nanoframes in Electrochemical Reforming of Ethanol for Efficient Hydrogen Production

“…Acetic acid would react with CuO through neutralization reaction to dissolve Cu into Cu 2+ . In addition, the chemical etching was carried out in acetic acid at 60 °C, further accelerating the oxidation of Cu and the etching process. , Transmission electron microscopy (TEM) and high-angle annular dark-field scanning TEM (HAADF–STEM) images of the sample after the acid treatment shown in Figure a,b demonstrate that the initial PtCu ND/C catalysts have been successfully eroded into highly open structure. The multi-channel feature of PtCu NF/C is attributed to the sharp loss of the Cu component revealed in scanning electron microscopy–energy-dispersive X-ray spectroscopy (SEM–EDS) and inductively coupled plasma optical emission spectrometry (ICP–OES) (Figure c and Table S1).…”