PtRh and PtRh/MoS2 nano-electrocatalysts for methanol oxidation and hydrogen evolution reactions

Sarno, Maria; Ponticorvo, Eleonora; Scarpa, Davide

doi:10.1016/j.cej.2018.12.060

Cited by 40 publications

(25 citation statements)

References 42 publications

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“…Recently, substituting the sluggish water oxidation with more favorable oxidizable species, such as methanol, − ethanol, − urea, − and hydrazine, − can open a new avenue for energy-efficient hydrogen generation. Among these species, because of carbon-free elemental composition, nonexplosive mixture products (H 2 and N 2 ), and lower theoretical potential during the hydrazine oxidation reaction (HzOR) (−0.33 V vs reversible hydrogen electrode, RHE), HzOR-assisted EWS is identified as an environmentally friendly and efficient energy-saving strategy for hydrogen generation. − Besides, through the method of electrolysis, water pollution problems associated with hydrazine in the chemical productive process can be efficiently solved.…”

Section: Introductionmentioning

confidence: 99%

Co_xP@Co₃O₄ Nanocomposite on Cobalt Foam as Efficient Bifunctional Electrocatalysts for Hydrazine-Assisted Hydrogen Production

Wang

et al. 2021

ACS Sustainable Chem. Eng.

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The kinetically sluggish oxygen evolution reaction (OER) at an anode has always been the bottleneck in the largescale application of electrocatalytic water splitting to produce ecofriendly and sustainable hydrogen. Therefore, replacing the OER with hydrazine oxidation reaction (HzOR), which requires a lower theoretical potential, has been considered as a more energyefficient strategy. Herein, a novel bifunctional Co x P@Co 3 O 4 nanocomposite with grass-like and block-like structures was fabricated on Co foam (defined as P−Co 3 O 4 /Co) via a facile hydrothermal synthesis for Co 3 O 4 and the sodium hypophosphitephosphorization method for cobalt phosphides. Compared with the Co 3 O 4 precursor on Co foam, the heterogeneous P−Co 3 O 4 / Co, composed of a mixture of CoP, Co 2 P, and Co 3 O 4 , possessed superb electrochemical catalytic activity for both the hydrogen evolution reaction and HzOR in 1.0 M KOH and 0.3 M hydrazine medium. Low overpotentials of 106 and 129 mV were required to deliver current densities of 10 and 200 mA cm −2 , respectively. Meanwhile, potentials of −100 and −83 mV are needed to drive current densities of 10 and 200 mA cm −2 , respectively, which exceed those of almost recently reported catalysts. The excellent performance can be attributed to the fact that the synergistic effect between the presence of multiphase of Co x P/Co 3 O 4 and the three-dimensional porous Co foam substrate makes the as-synthesized catalyst possess a large specific surface area and fast charge/ mass transport. Density functional theory calculations unravel that the phosphorization strategy can not only regulate the electronic structure of pristine Co 3 O 4 , enhancing the electronic conductivity, but also optimize the adsorption/desorption strength of H* and alter the free energy change of the dehydrogenation kinetics of NH 2 NH 2 *. Meanwhile, a low cell voltage of 1 V was achieved to deliver a current density of 948 mA cm −2 when P−Co 3 O 4 /Co behaved as both the cathode and anode simultaneously, which was superior to most of the nonprecious metal-based catalysts.

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Section: Introductionmentioning

confidence: 99%

Co_xP@Co₃O₄ Nanocomposite on Cobalt Foam as Efficient Bifunctional Electrocatalysts for Hydrazine-Assisted Hydrogen Production

Wang

et al. 2021

ACS Sustainable Chem. Eng.

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“…Meanwhile, Rh nanoparticles with good catalytic activity were added, and the synergy between Pt and Rh improved the utilization of Pt. 33 The CuPtRh CNBs/NH 2 −Ti 3 C 2 /GCE gives the maximum current response (Figure 3A, curve g; Figure 3B, curve d) and further shows excellent catalytic reproducibility (Figure S7B). For CuPtRh CNBs/NH 2 −Ti 3 C 2 , the functional group on the surface of Ti 3 C 2 facilitates more ammoniation, the NH 2 −Ti 3 C 2 changes the surface charge property, and more CuPtRh CNBs and Ti 3 C 2 can be combined by electrostatic action.…”

Section: ■ Results and Discussionmentioning

confidence: 92%

A Signal Amplification Strategy of CuPtRh CNB-Embedded Ammoniated Ti₃C₂ MXene for Detecting Cardiac Troponin I by a Sandwich-Type Electrochemical Immunosensor

Dong

Cao

Tan

et al. 2019

ACS Appl. Bio Mater.

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An early diagnosis of cardiovascular disease is of great importance to patients. Herein, a sandwich-type immunosensor for the detection of cardiac troponin I (cTnI) is prepared by using gold nanoparticles (Au NPs) and a composite (CuPtRh CNBs/NH2–Ti3C2) of trimetallic hollow CuPtRh cubic nanobox (CNB)-embedded few-layer ultrathin ammoniated MXene (NH2–Ti3C2). The embedding of the CuPtRh CNBs into NH2–Ti3C2 successfully prevents the restacking of NH2–Ti3C2 and offers more active sites for catalytic H2O2 reduction, which can effectively increase the current signal of the immunosensor. The designed sandwich-type electrochemical immunosensor for detection cTnI has a detection range of 25 fg mL–1 to 100 ng mL–1, and the detection limit is 8.3 fg mL–1 (S/N = 3). Moreover, the immunosensor also demonstrates high sensitivity, acceptable reproducibility, and good stability. More importantly, the designed system offers a direction for early clinical testing of cardiovascular and cerebrovascular diseases.

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“…The diffraction peaks of platinum face-centered cubic (fcc) structure, up-shifted due to the incorporation of Ru atoms indicating the formation of an alloy, are clearly visible in Figure 3. The reflection at about 60° can be assigned to the MoS 2 nanosheets structure [60]. The spectrum of the MoS 2 is almost completely covered by the metal alloy pattern; this is probably due to the non-crystalline structure of the one-layer MoS 2 nanosheets typically formed by this process [61].…”

Section: Resultsmentioning

confidence: 99%

A New Route for Low Pressure and Temperature CWAO: A PtRu/MoS2_Hyper-Crosslinked Nanocomposite

et al. 2019

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PtRu/MoS2 nanoparticles (NPs) (PtRu alloy partially coated by one-layer MoS2 nanosheets) were prepared through a ‘wet chemistry’ approach. The obtained NPs were directly embedded, at 5 parts per hundred resin/rubber (phr) loading, in a poly (divinylbenzene-co-vinyl benzyl chloride) hyper-crosslinked (HCL) resin, synthesized via bulk polymerization of the resin precursors, followed by conventional FeCl3 post-crosslinking. The obtained HCL nanocomposites were characterized to evaluate the effect of the NPs. It shows a high degree of crosslinking, a good dispersion of NPs and a surface area up to 1870 ± 20 m2/g. The catalytic activity of the HCL nanocomposite on phenol wet air oxidation was tested at low air pressure (Pair = 0.3 MPa) and temperature (T = 95 °C), and at different phenol concentrations. At the lower phenol concentration, the nanocomposite gives a total organic carbon (TOC) conversion of 97.1%, with a mineralization degree of 96.8%. At higher phenol concentrations, a phenol removal of 99.9%, after 420 min, was achieved, indicating a quasi-complete depletion of phenol, with a TOC conversion of 86.5%, corresponding to a mineralization degree of 84.2%. Catalyst fouling was evaluated, showing good reusability of the obtained nanocomposite.

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PtRh and PtRh/MoS2 nano-electrocatalysts for methanol oxidation and hydrogen evolution reactions

Cited by 40 publications

References 42 publications

Co_xP@Co₃O₄ Nanocomposite on Cobalt Foam as Efficient Bifunctional Electrocatalysts for Hydrazine-Assisted Hydrogen Production

Co_xP@Co₃O₄ Nanocomposite on Cobalt Foam as Efficient Bifunctional Electrocatalysts for Hydrazine-Assisted Hydrogen Production

A Signal Amplification Strategy of CuPtRh CNB-Embedded Ammoniated Ti₃C₂ MXene for Detecting Cardiac Troponin I by a Sandwich-Type Electrochemical Immunosensor

A New Route for Low Pressure and Temperature CWAO: A PtRu/MoS2_Hyper-Crosslinked Nanocomposite

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PtRh and PtRh/MoS2 nano-electrocatalysts for methanol oxidation and hydrogen evolution reactions

Cited by 40 publications

References 42 publications

CoxP@Co3O4 Nanocomposite on Cobalt Foam as Efficient Bifunctional Electrocatalysts for Hydrazine-Assisted Hydrogen Production

CoxP@Co3O4 Nanocomposite on Cobalt Foam as Efficient Bifunctional Electrocatalysts for Hydrazine-Assisted Hydrogen Production

A Signal Amplification Strategy of CuPtRh CNB-Embedded Ammoniated Ti3C2 MXene for Detecting Cardiac Troponin I by a Sandwich-Type Electrochemical Immunosensor

A New Route for Low Pressure and Temperature CWAO: A PtRu/MoS2_Hyper-Crosslinked Nanocomposite

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Co_xP@Co₃O₄ Nanocomposite on Cobalt Foam as Efficient Bifunctional Electrocatalysts for Hydrazine-Assisted Hydrogen Production

Co_xP@Co₃O₄ Nanocomposite on Cobalt Foam as Efficient Bifunctional Electrocatalysts for Hydrazine-Assisted Hydrogen Production

A Signal Amplification Strategy of CuPtRh CNB-Embedded Ammoniated Ti₃C₂ MXene for Detecting Cardiac Troponin I by a Sandwich-Type Electrochemical Immunosensor