Substrate-induced assembly of PtAu alloy nanostructures at choline functionalized monolayer interface for nitrite sensing

Wang, Po; Zhou, Fuyi; Wang, Zongwen; Lai, Chuan; Han, Xiang

doi:10.1016/j.jelechem.2015.05.006

Cited by 22 publications

(3 citation statements)

References 55 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The Pt L 3edge white-line intensity increases and Rh K-edge rising edge shifts to higher photon energy value, while the Au L 3 -edge white-line slightly decreases compared to their metallic phase, indicating electron transfer from Pt and Rh to Au. These are consistent with XPS spectra, wherein PtRhAu contains Pt 4f and Rh 3d shifted to a higher binding energy and Au 4f shifted to a lower binding energy 37 (Figure S15). Pt L 3 -edge, Au L 3edge, and Rh K-edge EXAFS spectra for PtRhAu (Figure S14) show slight changes in atomic bonding for Pt and Au atoms and a significant change in atomic bonding for Rh compared to monometallic controls due to alloying.…”

Section: Resultssupporting

confidence: 86%

Ternary Alloys Enable Efficient Production of Methoxylated Chemicals via Selective Electrocatalytic Hydrogenation of Lignin Monomers

et al. 2021

View full text Add to dashboard Cite

We explore the selective electrocatalytic hydrogenation of lignin monomers to methoxylated chemicals, of particular interest, when powered by renewable electricity. Prior studies, while advancing the field rapidly, have so far lacked the needed selectivity: when hydrogenating lignin-derived methoxylated monomers to methoxylated cyclohexanes, the desired methoxy group (−OCH 3 ) has also been reduced. The ternary PtRhAu electrocatalysts developed herein selectively hydrogenate lignin monomers to methoxylated cyclohexanesmolecules with uses in pharmaceutics. Using X-ray absorption spectroscopy and in situ Raman spectroscopy, we find that Rh and Au modulate the electronic structure of Pt and that this modulating steers intermediate energetics on the electrocatalyst surface to facilitate the hydrogenation of lignin monomers and suppress C−OCH 3 bond cleavage. As a result, PtRhAu electrocatalysts achieve a record 58% faradaic efficiency (FE) toward 2-methoxycyclohexanol from the lignin monomer guaiacol at 200 mA cm −2 , representing a 1.9× advance in FE and a 4× increase in partial current density compared to the highest productivity prior reports. We demonstrate an integrated lignin biorefinery where wood-derived lignin monomers are selectively hydrogenated and funneled to methoxylated 2-methoxy-4-propylcyclohexanol using PtRhAu electrocatalysts. This work offers an opportunity for the sustainable electrocatalytic synthesis of methoxylated pharmaceuticals from renewable biomass.

show abstract

Section: Resultssupporting

confidence: 86%

Ternary Alloys Enable Efficient Production of Methoxylated Chemicals via Selective Electrocatalytic Hydrogenation of Lignin Monomers

et al. 2021

View full text Add to dashboard Cite

show abstract

“…The binding energy of Au 4f in bimetallic 1.5Pt 1 Au 4 /N-HNT was lower compared with that in monometallic 1.5Au/N-HNT, and the binding energy of Pt 4f in bimetallic 1.5Pt 1 Au 4 /N-HNT was higher compared with that in monometallic 1.5Pt/N-HNT. The shift of the binding energy was ascribed to the perturbed electronic interaction between Au and Pt atomic orbits arising from the formation of alloy. , The Fermi level of Pt is higher than that of Au. The electron of Pt tends to transfer to Au due to its higher electronegativity, resulting in the change of d-electron density and binding energy. , Notably, metallic Au 0 and Pt 0 both occurred in high relative proportions (Table S2), indicating that Au and Pt species exist dominantly in the form of metallic states, and there were also a small amount of Au + and Au 3+ or Pt 2+ cationic species which may be associated with the surface oxidation of metallic species, or the interaction between the nanoparticles and support. , …”

Section: Resultsmentioning

confidence: 99%

“…The shift of the binding energy was ascribed to the perturbed electronic interaction between Au and Pt atomic orbits arising from the formation of alloy. 55,58 The Fermi level of Pt is higher than that of Au. The electron of Pt tends to transfer to Au due to its higher electronegativity, resulting in the change of d-electron density and binding energy.…”

Section: Methodsmentioning

confidence: 99%

Coupling Natural Halloysite Nanotubes and Bimetallic Pt–Au Alloy Nanoparticles for Highly Efficient and Selective Oxidation of 5-Hydroxymethylfurfural to 2,5-Furandicarboxylic Acid

Zhong

Yuan

Wei

et al. 2022

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

The aerobic oxidation of 5-hydroxymethylfurfural (HMF), a key platform compound derived from biomass, to 2,5-furandicarboxylic acid (FDCA) is a highly important reaction in the production of green and sustainable chemicals. Here, we developed a highly efficient and stable halloysite-supported Pt−Au alloy catalyst for the selective oxidation of HMF to FDCA. The catalyst was synthesized through the organosilane functionalization of halloysite nanotubes, followed by the in situ formation and dispersion of Pt−Au alloy nanoparticles on the internal and external surfaces of nanotubes. The composition, morphology, and structure of the prepared catalyst were characterized. The catalyst with the optimal composition of Pt/Au molar ratio of 1/4 and metal loading of 1.5 wt % exhibited outstanding catalytic activity for the oxidation of HMF to FDCA using O 2 as an oxidant with 100% conversion of HMF and 99% selectivity of FDCA. This excellent catalytic performance is mainly attributed to the high dispersion and alloying effects of bimetallic nanoparticles, which promoted the activation of reactants or intermediates and further improved FDCA selectivity. Furthermore, the halloysite-supported Pt/Au bimetallic catalyst showed high stability and reusability. This study provides a promising strategy by combining clay mineral halloysite and bimetallic alloys for developing efficient catalysts with high FDCA selectivity and stability for the oxidation of HMF to FDCA.

show abstract

Colloidal synthesis of perovskite-type lanthanum aluminate incorporated graphene oxide composites: Electrochemical detection of nitrite in meat extract and drinking water

et al. 2022

View full text Add to dashboard Cite

Substrate-induced assembly of PtAu alloy nanostructures at choline functionalized monolayer interface for nitrite sensing

Cited by 22 publications

References 55 publications

Ternary Alloys Enable Efficient Production of Methoxylated Chemicals via Selective Electrocatalytic Hydrogenation of Lignin Monomers

Ternary Alloys Enable Efficient Production of Methoxylated Chemicals via Selective Electrocatalytic Hydrogenation of Lignin Monomers

Coupling Natural Halloysite Nanotubes and Bimetallic Pt–Au Alloy Nanoparticles for Highly Efficient and Selective Oxidation of 5-Hydroxymethylfurfural to 2,5-Furandicarboxylic Acid

Colloidal synthesis of perovskite-type lanthanum aluminate incorporated graphene oxide composites: Electrochemical detection of nitrite in meat extract and drinking water

Contact Info

Product

Resources

About