Facile Synthesis of Pd Nanosheets and Implications for Superior Catalytic Activity

Abstract

As a member of the 2D materials family, 2D metal nanosheets (metallenes) have received increasing attention due to their intriguing properties distinct from those of graphene and other inorganic 2D nanosheets. However, the synthesis of metallenes is still challenging, owing to the lack of an efficient synthetic approach. Here we present a facile one-pot approach to the controlled synthesis of Pd nanosheets. A key feature of this process is a stepwise reaction using 2,4,6-trichlorophenyl formate (TCPF); TCPF emits carbon monoxide gas, which acts as both a reductant and a surface capping agent, promoting the anisotropic 2D growth of the Pd nanosheets. Photoemission spectroscopy revealed some peculiar features of the surface charge and valence band states due to suppressed electron transfer at the 2D surface. This surface state caused improved catalytic activity for the hydrogen evolution reaction compared to that of bulk Pd.

Crystalline–Amorphous Heterophase PdMoCrW Tetrametallene: Highly Efficient Oxygen Reduction Electrocatalysts for a Long-Term Zn–Air Battery

“…Therefore, in the absence of PVP, nanosheets agglomerate and self-assemble into nanoflowers (Figure S7c of the Supporting Information). 46,47 Time-dependent experiments were performed to understand the formation mechanism of PdMoCrW tetrametallene (panels a−f of Figure 3). Initially, within 1 min of the reaction, numerous uniformly dispersed Pd nanoparticles are formed.…”

“…PVP can be adsorbed on the metal surface, and the spatial coiling of its long polymer has a spatial site-blocking effect that prevents agglomeration. Therefore, in the absence of PVP, nanosheets agglomerate and self-assemble into nanoflowers (Figure S7c of the Supporting Information). , …”

Liquid exfoliation of molybdenum metallenes for non-inflammatory photothermal therapy of tumors

“…15,16 In particular, the ultrahigh exposure of under-coordinated metal atoms in metallenes gives them great potential for improving atomic utilization and intrinsic activity. 17,18 In biomedicine, they have been used in photothermal therapy research because of their favorable plasmonic resonance properties. For example, PdMo bimetallenes have good photothermal conversion efficiencies in both NIR I and NIR II near-infrared windows.…”

Metal–Support Interaction in Pt Nanodisk–Carbon Nitride Catalyst: Insight from Theory and Experiment

“…Investigating the synthesis of atomically thin noble metals and their stabilisation can reveal new aspects of metals absent in bulk and isotropically synthesised nanoscaled metal structures [ 1 , 2 , 3 ]. However, the stabilisation of these metals is cumbersome due to the high cohesive energy that causes the metals to aggregate into larger sizes.…”