A Two‐dimensional Amorphous Plasmonic Heterostructure of Pd/MoO_3‐x for Enhanced Photoelectrochemical Water Splitting Performance

Abstract

Two‐dimensional (2D) heterostructures based on localized surface plasmon resonance (LSPR) have a great potential for solar energy harvesting applications. Exploring 2D amorphous plasmonic heterostructures with high light absorption and catalytic activity is desirable yet challenging. Herein, 2D Pd/MoO3‐x amorphous heterostructures can be obtained by immobilizing Pd single atoms in unsaturated coordination sites of amorphous MoO3‐x, because of strong metal‐support interactions, and it reaches a current density of 50 μA cm−2 for photoelectrochemical response with good durability, and exhibits a high incident‐photon‐to‐current‐conversion efficiency (IPCE) of 14.8% at 460 nm. Such an enhanced catalytic effects are contributed to the enhanced light absorption in visible region and change of electronic structure owing to enhanced electron transfer through dominant Pd−O bonds, which facilitate water splitting. This work moves a step closer to the expansion of photovoltaic device with the high conversion efficiency for visible light for amorphous heterostructures.

Bringing Earth-Abundant Plasmonic Catalysis to Light: Gram-Scale Mechanochemical Synthesis and Tuning of Activity by Dual Excitation of Antenna and Reactor Sites

“…62−64 Finally, there was a decrease in the PL intensity for the Au/MoO 3 _P sample as compared to MoO 3 _P, indicating that the presence of Au improves electron−hole separation and suppresses the fluorescence-associated recombination. 65 We then investigate the morphological features associated with the ball-milling process and the formation of the Au/ MoO 3 _P sample. While MoO 3 _C displayed a layered, platelike morphology with micrometric sizes assigned to orthorhombic α-MoO 3 , ball milling led to the reduction of the sizes yielding a heterogeneous size distribution of microplates and irregular particles (Figure S7).…”

“…The PL spectra for both samples displayed PL emission peaks in the 400–620 nm region. The peak around 425 nm was attributed to the radiative recombination of interband excitons in crystalline MoO 3 , which can be shifted as a function of the size and shape of the nanomaterials. , The presence of multiple lower energy bands can be assigned to defect emission, mainly due to oxygen vacancies, and the intervalence charge transfer transitions. − Finally, there was a decrease in the PL intensity for the Au/MoO 3 _P sample as compared to MoO 3 _P, indicating that the presence of Au improves electron–hole separation and suppresses the fluorescence-associated recombination …”

Co3O4/MoCo/Layered Double Hydroxide Nanosheets for Asymmetric Supercapacitor

“…As a result, before the Faradic reaction, Mo 5+ and Mo 6+ were presented; after that, the XPS spectra showed two sharp peaks at 232.14 and 235.4 eV attributed to the Mo 3d 5/2 and Mo 3d 3/2 contributing to Mo 6+ , respectively ((Mo 5+ , Mo 6+ ) → 2 Mo 6+ + e − ). 45 Moreover, Figure S6-A One of the most prominent features for evaluating supercapacitors is cyclic stability. Figure S7 illustrates the outstanding stability of the Co 3 O 4 /MoCo/LDH/NF electrode after 5000 sequential cycles at a current density of 9.0 A g −1 .…”

Rational Design of Pt−Pd−Ni Trimetallic Nanocatalysts for Room‐Temperature Benzaldehyde and Styrene Hydrogenation

“…It can be seen that the Pt species mainly exist in the form of Pt 2+ (72.4 eV), Pt 4+ (73.5 eV) and Pt(0)(71.5 eV) on the surface of the Pt/Ni/C and Pt−Pd/Ni/C catalysts. However, the Pd species on the surface of the Pd/Ni/C and Pt−Pd/Ni/C catalysts are mainly in the form of Pd(0)(335.6 eV), with a small amount of oxidized Pd n+ species (337.5 eV) [42] . The possible reason is that the dispersion of Pt on the catalyst surface is much higher than that of Pd, which makes the surface Pt species more susceptible to be oxidized (relative to Pd species).…”