Microwave one-pot synthesis of CNT-supported amorphous Ni–P alloy nanoparticles with enhanced hydrogenation performance

Kang, Yunqing; Du, Haoran; Jiang, Bo; Li, Hui; Guo, Yanna; Amin, Mohammed A.; Sugahara, Yoshiyuki; Asahi, Toru; Li, Hexing; Yamauchi, Yusuke

doi:10.1039/d1ta10742a

Cited by 15 publications

(5 citation statements)

References 43 publications

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“…Meanwhile, the Ru 0 -Pd 0 nucleation solution was prepared separately using Ru 3+ and Pd 2+ containing ions solution, and NaBH 4 was used as a reducing agent to reduce Ru 3+ -Pd 2+ to Ru 0 -Pd 0 nuclei under microwave irradiation. Using microwaves enhances the interfacial interaction between Ru 0 and Pd 0 , which aids in alloyed nanostructure formation of Ru 0 -Pd 0 . ,, …”

Section: Resultsmentioning

confidence: 99%

“…Using microwaves enhances the interfacial interaction between Ru 0 and Pd 0 , which aids in alloyed nanostructure formation of Ru 0 -Pd 0 . 5,62,63 Furthermore, the obtained Ru 0 -Pd 0 nucleation solution was slowly added to the WO 3 /MXene suspension to form Ru 0 -Pd 0 /WO 3 /MXene. In the final step, the ternary nucleation solution was hydrothermally treated to form Ru−Pd/WO 3 / MXene nanocomposites.…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

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Synergistic Bimetallic Sites in 2D-on-2D Heterostructures for Enhanced C–N Coupling in Sustainable Urea Synthesis

Govindan,

Annamalai,

Kumar

et al. 2024

ACS Sustainable Chem. Eng.

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Electrochemical conversion of CO2 and N2 to produce “green urea” using renewable energy represents a promising avenue for CO2 mitigation. A bifunctional electrocatalyst with a desirable composition and structure is highly required for the electrochemical reduction of CO2 and N2 (CO2N2RR) into urea. Herein, Ru–Pd alloyed nanoparticles were successfully incorporated into 2D WO3 and MXene nanosheets, resulting in the formation of Ru–Pd/WO3/MXene heterostructures. The catalyst significantly enhances electrocatalytic C–N coupling in CO2 and N2 reduction, resulting in increased urea yield. The electrochemical reduction initially converts CO2 into *CO, which then undergoes direct coupling with N2 to form urea through continuous protonation. Simultaneously, water molecules are oxidized on the bifunctional Ru–Pd/WO3/MXene electrodes. The mechanism of C–N coupling for urea formation is elucidated through density functional theory (DFT) calculations. The Ru–Pd/WO3/MXene catalyst exhibits a noteworthy urea yield of 227 μgurea mgcat –1h–1 with a faradaic efficiency of 23.7%. The detailed understanding of the CO2N2RR mechanism and the recyclable properties of the electrode emphasizes its suitability for prolonged use. This study not only presents a road map for advancing electrolysis but also provides profound insights into the fundamental chemistry of C–N coupling reactions.

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Section: Resultsmentioning

confidence: 99%

Section: ■ Materials and Methodsmentioning

confidence: 99%

Synergistic Bimetallic Sites in 2D-on-2D Heterostructures for Enhanced C–N Coupling in Sustainable Urea Synthesis

Govindan,

Annamalai,

Kumar

et al. 2024

ACS Sustainable Chem. Eng.

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“…The carbon support significantly affects the morphology and oxidation state of the metals in the electrocatalysts. ,, Hence, in this work, KB is used as a control parameter to provide sufficient electronic conductivity and porosity for nanoparticle dispersion and mass transport diffusion.…”

Section: Methodsmentioning

confidence: 99%

Effects of Metal–Oxygen Coordination in Pt–Ru–Sn Electrocatalyst in the Electrochemical Reforming of Aqueous EtOH in a Solid-Polymer-Electrolyte Electrolysis Cell

Lidasan,

Kojima,

Iguchi

et al. 2024

ACS Appl. Energy Mater.

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The use of a solid-polymer-electrolyte (SPE) electrolysis cell for the electrochemical reforming of bioethanol to hydrogen is a promising route to utilize biomass to decarbonize hydrogen production through the EtOH electro-oxidation reaction (EOR). We prepared a Ketjenblack (KB)-supported Pt−Ru−Sn catalyst by a NaBH 4 reduction method (Pt−Ru−Sn/KB), which achieved a steady-state current density of 9.4 mA cm −2 at 0.6 V with an EtOH consumption rate of 1.43 mol H2 •mol EtOH −1 . Based on cyclic voltammetry and characterization studies, we found that this activity was due to a three-way synergy between Pt, Ru, and Sn wherein the addition of Sn enhanced the initial oxidative adsorption of EtOH onto Ru and modified the electronic properties of Pt. A lower Sn atomic ratio in the presence of Ru led to higher Pt oxidation, which was directly proportional to EOR activity. Based on the X-ray absorption fine structure (XAFS) studies, both a low metal−metal coordination and a high metal−oxygen coordination resulted in the enhancement of current densities, which suggested that metal atoms surrounded by oxygen atoms were vital to the three-way synergy of the three metals that resulted in enhanced EOR activity; hence, a reaction mechanism was proposed based on these findings.

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“…In this study, we successfully introduced localized tetragonal distortion in the alloyed catalysts through modification of the atomic thermal diffusion process. We obtained cobalt oxide without oxygen vacancies using a rapid microwave heating method, 33 while the alloying process was easily modulated by adjusting the thermal reduction conditions. Structural and compositional analyses establish that ordered face‐centered cubic (FCC) and tetragonal structures coexist locally in the particles.…”

Section: Introductionmentioning

confidence: 99%

Local tetragonal distortion of Pt alloy catalysts for enhanced oxygen reduction reaction efficiency

Li,

Duan,

Hua

et al. 2024

Carbon Energy

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Platinum‐based alloy nanoparticles are the most attractive catalysts for the oxygen reduction reaction at present, but an in‐depth understanding of the relationship between their short‐range structural information and catalytic performance is still lacking. Herein, we present a synthetic strategy that uses transition‐metal oxide‐assisted thermal diffusion. PtCo/C catalysts with localized tetragonal distortion were obtained by controlling the thermal diffusion process of transition‐metal elements. This localized structural distortion induced a significant strain effect on the nanoparticle surface, which further shortened the length of the Pt–Pt bond, improved the electronic state of the Pt surface, and enhanced the performance of the catalyst. PtCo/C catalysts with special short‐range structures achieved excellent mass activity (2.27 A mgPt−1) and specific activity (3.34 A cm−2). In addition, the localized tetragonal distortion‐induced surface compression of the Pt skin improved the stability of the catalyst. The mass activity decreased by only 13% after 30,000 cycles. Enhanced catalyst activity and excellent durability have also been demonstrated in the proton exchange membrane fuel cell configuration. This study provides valuable insights into the development of advanced Pt‐based nanocatalysts and paves the way for reducing noble‐metal loading and increasing the catalytic activity and catalyst stability.

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Microwave one-pot synthesis of CNT-supported amorphous Ni–P alloy nanoparticles with enhanced hydrogenation performance

Abstract: Supported amorphous alloy catalysts have received wide attention due to their unique structural and electronic properties, high catalytic activity, and thermal stability. In this work, a carbon nanotubes (CNTs)-supported amorphous...

Cited by 15 publications

References 43 publications

Synergistic Bimetallic Sites in 2D-on-2D Heterostructures for Enhanced C–N Coupling in Sustainable Urea Synthesis

Synergistic Bimetallic Sites in 2D-on-2D Heterostructures for Enhanced C–N Coupling in Sustainable Urea Synthesis

Effects of Metal–Oxygen Coordination in Pt–Ru–Sn Electrocatalyst in the Electrochemical Reforming of Aqueous EtOH in a Solid-Polymer-Electrolyte Electrolysis Cell

Local tetragonal distortion of Pt alloy catalysts for enhanced oxygen reduction reaction efficiency

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