Reaction-driven transformation of Ni/NiO hybrid structure into Ni single atoms

Effect of Precursors of Fe-Based Fischer–Tropsch Catalysts Supported on Expanded Graphite for CO2 Hydrogenation

“…The peak at 399.1 eV corresponded to pyridine nitrogen, the peak at 400.1 eV corresponded to pyrrole nitrogen, and the peak at 401.1 eV corresponded to quaternary nitrogen. 50,51 It was speculated that these N functional groups were doped on the surface of EG due to the interaction of NH 3 with EG at high temperatures during calcination. Research studies have shown that N functional groups can provide an electron-donating anchoring ef- fect.…”

“…Further deconvolution of the N 1s spectrum of FeNa/EG-A showed that there were three N species on its surface. The peak at 399.1 eV corresponded to pyridine nitrogen, the peak at 400.1 eV corresponded to pyrrole nitrogen, and the peak at 401.1 eV corresponded to quaternary nitrogen. , It was speculated that these N functional groups were doped on the surface of EG due to the interaction of NH 3 with EG at high temperatures during calcination. Research studies have shown that N functional groups can provide an electron-donating anchoring effect. ,, Under the electron-donating anchoring effect, carbon nanotubes, graphene, and mesoporous carbon with N-doped groups could significantly improve the FTS activity of Fe-based catalysts …”

Single-atom sites combined with metal nano-aggregates for efficient electrocatalysis

“…Shao and co-workers constructed Ni/NiO hybrid structures on N-doped CNTs (NiO/Ni@NCNTs) as HER electrocatalysts. 67 During the HER process, the reaction-driven transformation of Ni/NiO hybrid structures into Ni single atoms and Ni NCs was observed on the deformed N-doped CNTs. And the Ni single atoms and Ni NCs were stably anchored on the N-doped CNTs even after rigorous acid-etching.…”

Cooperative Sites in Fully Exposed Pd Clusters for Low-Temperature Direct Dehydrogenation Reaction

“…10−13 Due to the highly uniform local environments of single atoms, the catalytic mechanisms can be better illustrated by rational design and computational models. 14,15 However, SACs may encounter low catalytic efficiency and sintering due to the lack of neighboring sites in some reactions. 16−18 On the other hand, fully exposed cluster catalysts (FECCs) can provide catalytic sites with adjacent metal atoms while maintaining full atomic utilization efficiency, offering various structural possibilities and catalytic feasibilities.…”

“…Recently, single-atom sites catalysts (SACs) with excellent atom-utilization efficiency and unsaturated coordination environments have received much research attention. − Due to the highly uniform local environments of single atoms, the catalytic mechanisms can be better illustrated by rational design and computational models. , However, SACs may encounter low catalytic efficiency and sintering due to the lack of neighboring sites in some reactions. − On the other hand, fully exposed cluster catalysts (FECCs) can provide catalytic sites with adjacent metal atoms while maintaining full atomic utilization efficiency, offering various structural possibilities and catalytic feasibilities. − Moreover, FECCs not only have ultrasmall sizes, but also exhibit small contact angles with the supports, which can provide stronger interaction between the metal atoms and the supports and increase the stability of the clusters . In this case, FECCs with multiple active sites and atomic dispersion may be a preferred choice for the EB DDH reaction.…”