Interaction of Ni/Cu(100) surfaces with O2 studied by XPS

Wang

et al. 2023

Small

Developing stable catalysts with higher selectivity and activity within a wide potential range is critical for efficiently converting CO2 to ethanol. Here, the carbon‐encapsulated CuNi nanoparticles anchored on nitrogen‐doped nanoporous graphene (CuNi@C/N‐npG) composite are designedly prepared and display the excellent CO2 reduction performance with the higher ethanol Faradaic effiency (FEethanol ≥ 60%) in a wide potential window (600 mV). The optimal cathodic energy efficiency (47.6%), Faradaic efficiency (84%), and selectivity (96.6%) are also obtained at −0.78 V versus reversible hydrogen electrode (RHE). Combining with the density functional theory (DFT) calculations, it is demonstrated that the stronger metal‐support interaction (Ni‐N‐C) can regulate the surface electronic structure effectively, boosting the electron transfer and stabilizing the active sites (Cu0‐Cuδ+) on the surface of CuNi@C/N‐npG, finally realizing the controllable transition of reaction intermediates. This work may guide the designs of electrocatalysts with highly catalytic performance for CO2 reduction to C2+ products.

Section: Resultsmentioning

confidence: 68%

Regulated Surface Electronic States of CuNi Nanoparticles through Metal‐Support Interaction for Enhanced Electrocatalytic CO₂ Reduction to Ethanol

Wang

et al. 2023

Small

ACS Sustainable Chem. Eng.

“…After reduction (Figure 4b), a metallic state of Ni 0 was present according to the XRD results of these samples. Thus, the lower binding energy components at 851.5, 852.8, 40,41 and 853.2 eV 42 were attributed to the metallic state Ni 0 . However, changes in the binding energy of the elements still exist, especially for the Ni/AlCaO x sample, where the binding energy at 851.5 eV was the lowest among all of the samples, even lower than the existing research data.…”

Section: ■ Results and Discussionmentioning

confidence: 96%

Ni–Ca–Al Synergistic Effect in Dual-Function Materials for Integrated CO₂ Capture and Conversion

Li,

Zhang,

Feng

et al. 2024

Integrated carbon capture and utilization (ICCU), based on dual-function materials (DFMs), is an emerging technology for carbon dioxide (CO 2 ) emission control. DFMs composed of Ni−Ca−Al systems are favored owing to their affordability. However, their performance needs to be further improved. In this study, Ni/AlCaO x DFMs are prepared by one pot-impregnation method, reaching an adsorbing capacity of 1796 μmol CO 2 /g DFM and a production of 1790 μmol CH 4 /g DFM after ten cycles at 450 °C. The Ni−Ca−Al synergistic effect was investigated to understand the good performance of DFMs: during H 2 pretreatment, Ca can weaken the strong interaction of Al−Ni and promote the reduction of NiO by facilitating Ni to gain electrons from H 2 , where Al may act as an intermediate carrier for electron transfer. In the carbonation process, Al modulates the synergistic interaction between Ca and Ni by regulating the spacing and distribution of catalytic and adsorption sites to improve the Ni/AlCaO x cycling performance. Besides, oxygen vacancies can also enhance the DFMs' carbon capture performance. During the methanation process, Ni reduces the decomposition temperature of the carbonate formed at strongly basic sites, favoring the methanation reaction.

ACS Appl. Mater. Interfaces

“…The full XPS spectrum shows that Ni nanosheet/Ag nanowire composites are composed of Ni, Ag, C, and O elements (Figure S3a). The high-resolution XPS spectrum of Ni 2p is similar to Ni nanosheets, except the peak at 854.1 eV might correspond to Ni nanosheet/Ag nanowire composites (Figure S3b), similar to the reported Ni/Cu peak. , The high-resolution XPS spectrum of Ag 3d is illustrated in Figure S3c, with two peaks located at 374.5 and 368.61 eV, corresponding to Ag 3d 3/2 and Ag 3d 5/2 , respectively, indicating the presence of Ag. The hysteresis loop indicates that the value of M s decreases with the increase of content of Ag nanowire (Figure S4).…”

Section: Resultsmentioning

confidence: 99%

Synthesis of Ni Nanosheets by Template-Free Method and Their Application in Conductive and Magnetic Flexible Electrons

Dang

Liu

et al. 2023

Two-dimensional Ni nanosheets are synthesized by the templatefree method using Na 3 CA as an orientation agent in liquid phase, and then the conductive Ni nanosheet ink is prepared for conductive circuits on flexible electronics. The thickness of the Ni nanosheets is about 800 nm, and the diameter is about 100 μm. Na 3 CA plays a structural guiding role to form Ni nanocrystals, promoting the self-assembly of Ni nanocrystals into Ni nanosheets effectively. The laminar stackable patterns of the Ni nanosheet circuits increase the contact area of the Ni nanosheets and improve the stability of the conductors under stress. Ni nanosheets can bend with the folding of the structure, while the mutual constraints between their layers promote the circuit to remain stable during the bending state. Therefore, the Ni nanosheet circuits display excellent conductive performance during the tiled and bent stages. In addition, Ni nanosheet/Ag nanowire composites are prepared to enhance conductivity to meet higher demands. Moreover, the experimental results of its application in magnetic guided switch closure circuits show that Ni nanosheet/Ag nanowire composites have the potential to participate in both conductive and magnetic field applications simultaneously.