Atomically Dispersed Pd on Nanodiamond/Graphene Hybrid for Selective Hydrogenation of Acetylene

Single‐atom catalysts (SACs) have attracted great attention owing to their maximum atomic utilization and high catalytic performance in electrochemical reactions. But the synthesis of SACs is not easy due to large surface energies of single atomic metal sites which often lead to their aggregation. The defects on supports can serve as anchor sites to stabilize single metal atoms and prevent them from aggregation, which has become an effective method to fabricate SACs. This review summarizes the meaningful findings about the defects on supports stabilizing single metal atoms, and their applications in electrocatalytic reaction. Various defects, including the intrinsic defects or heteroatom doping of carbon‐based materials, cation or anion vacancies of metal compound supports, and other defects (step edges, lattice defects, and caves), are comprehensively summarized, and the effects of defects on designing SACs are discussed. Although there are still many challenges to fully explore the SACs, it is believed that the newly established defect sites stabilized single atoms mechanism will be helpful for designing and fabricating highly powerful single atomic electrocatalysts for practical applications.

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Section: Defects‐based Single Atomic Electrocatalystmentioning

confidence: 99%

“…Recently, Liu and co‐workers reported that single Pd atoms were trapped on the nanodiamond–graphene support with defects (Pd 1 /ND@G) . The few‐layer graphene outersheet with high defects was formed after an annealing process.…”

Section: Defects‐based Single Atomic Electrocatalystmentioning

confidence: 99%

Defect‐Based Single‐Atom Electrocatalysts

et al. 2018

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“…I n recent years, single-atom catalysts (SACs) have attracted considerable attention as a means by which to maximize precious metal utilization and generate well-defined, uniform active sites [1][2][3][4][5][6][7][8][9] . SACs exhibit superior catalytic performance (activity and/or selectivity) for thermal oxidation 1,10-12 and hydrogenation 9,[13][14][15][16][17] , electrochemistry [18][19][20][21][22][23] , and industrially important processes such as the water-gas shift reaction, C-C coupling, C-H activation, and methanol reforming 11,[24][25][26][27] . Counter-intuitively, SACs were recently reported to exhibit better stability than their nanoparticle (NP) counterparts, highlighting their potential for commercial applications 28,29 .…”

mentioning

confidence: 99%

Strong metal-support interaction promoted scalable production of thermally stable single-atom catalysts

et al. 2020

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Single-atom catalysts (SACs) have demonstrated superior catalytic performance in numerous heterogeneous reactions. However, producing thermally stable SACs, especially in a simple and scalable way, remains a formidable challenge. Here, we report the synthesis of Ru SACs from commercial RuO 2 powders by physical mixing of sub-micron RuO 2 aggregates with a MgAl 1.2 Fe 0.8 O 4 spinel. Atomically dispersed Ru is confirmed by aberration-corrected scanning transmission electron microscopy and X-ray absorption spectroscopy. Detailed studies reveal that the dispersion process does not arise from a gas atom trapping mechanism, but rather from anti-Ostwald ripening promoted by a strong covalent metalsupport interaction. This synthetic strategy is simple and amenable to the large-scale manufacture of thermally stable SACs for industrial applications.

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“…Figure d shows the Fourier transformed (FT) extended X‐ray absorption fine structure (EXAFS) spectra of Pd 1 /GDY/G‐O and Pd foil in R space. For Pd 1 /GDY/G‐O, the only distinct peak observed at 1.9 Å corresponds to the first coordination shell of Pd in a bonding configuration of PdC or PdO . In contrast, for Pd foil, an appreciable peak at about 2.8 Å can be ascribed to the first shell Pd–Pd coordination.…”

Section: Resultsmentioning

confidence: 95%

Atomic Pd on Graphdiyne/Graphene Heterostructure as Efficient Catalyst for Aromatic Nitroreduction

Zhong

Tong

et al. 2019

Adv Funct Materials

120

107

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With the maximum atom-utilization efficiency, single atom catalysts (SACs) have attracted great research interest in catalysis science recently. To address the following key challenges for the further development of SACs: i) how to stabilize and avoid the aggregation of SACs, ii) how to enhance the specific surface area and conductivity of supports, and iii) how to achieve scalable mass production with low cost, a SAC consisting of single Pd atoms anchored on well-designed graphdiyne/graphene (GDY/G) heterostructure (Pd 1 /GDY/G) is synthesized. Pd 1 /GDY/G exhibits high catalytic performance, as demonstrated by the reduction reaction of 4-nitrophenol. Furthermore, density functional theory calculation indicates that graphene in the GDY/G heterostructure plays a key role in the enhancement of catalytic efficiency owing to the electron transfer process, deriving from the gap between the Fermi level of graphene and the conduction band minimum of GDY. The GDY/G heterostructure is a promising support for the preparation of extremely efficient and stable SACs, which can be used in a broad range of future industrial reactions.

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Atomically Dispersed Pd on Nanodiamond/Graphene Hybrid for Selective Hydrogenation of Acetylene

Cited by 357 publications

References 30 publications

Defect‐Based Single‐Atom Electrocatalysts

Defect‐Based Single‐Atom Electrocatalysts

Strong metal-support interaction promoted scalable production of thermally stable single-atom catalysts

Atomic Pd on Graphdiyne/Graphene Heterostructure as Efficient Catalyst for Aromatic Nitroreduction

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