Synthesis of 3D Flower-Like Ni0.6Zn0.4O Microspheres for Electrocatalytic Oxidation of Methanol

Wei, Shengliang; Qian, Lihong; Jia, Dongling; Miao, Yuqing

doi:10.1007/s12678-019-00542-5

Cited by 7 publications

(5 citation statements)

References 36 publications

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“…The diffraction peaks at 36.85°, 42.81°, 62.15°, 74.49°, and 78.42° are used to represent the Ni 0.6 Zn 0.4 O crystal planes (111), (200), (220), (311), and (222), respectively. Similar observations were reported by Wei and co-workers [ 37 ]. The crystallite sizes (L) are estimated at 11.24 nm through the Scherrer formula as in Equation (1) below: L = Kλ/ β cos θ where λ is the X-ray used (0.154 nm), β (physical broadening) is the full width at half the maximum, θ is the angle of Bragg’s diffraction, and shape factor K = 0.94 constant.…”

Section: Resultssupporting

confidence: 92%

Ni0.6Zn0.4O Synthesised via a Solid-State Method for Promoting Hydrogen Sorption from MgH2

2023

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Magnesium hydrides (MgH2) have drawn a lot of interest as a promising hydrogen storage material option due to their good reversibility and high hydrogen storage capacity (7.60 wt.%). However, the high hydrogen desorption temperature (more than 400 °C) and slow sorption kinetics of MgH2 are the main obstacles to its practical use. In this research, nickel zinc oxide (Ni0.6Zn0.4O) was synthesized via the solid-state method and doped into MgH2 to overcome the drawbacks of MgH2. The onset desorption temperature of the MgH2–10 wt.% Ni0.6Zn0.4O sample was reduced to 285 °C, 133 °C, and 56 °C lower than that of pure MgH2 and milled MgH2, respectively. Furthermore, at 250 °C, the MgH2–10 wt.% Ni0.6Zn0.4O sample could absorb 6.50 wt.% of H2 and desorbed 2.20 wt.% of H2 at 300 °C within 1 h. With the addition of 10 wt.% of Ni0.6Zn0.4O, the activation energy of MgH2 dropped from 133 kJ/mol to 97 kJ/mol. The morphology of the samples also demonstrated that the particle size is smaller compared with undoped samples. It is believed that in situ forms of NiO, ZnO, and MgO had good catalytic effects on MgH2, significantly reducing the activation energy and onset desorption temperature while improving the sorption kinetics of MgH2.

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Section: Resultssupporting

confidence: 92%

Ni0.6Zn0.4O Synthesised via a Solid-State Method for Promoting Hydrogen Sorption from MgH2

2023

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“…In fact, since transition metal oxides/hydroxides have high electro-oxidation properties and good stability, they have been used as electrocatalysts for fuel cells by numerous research efforts. 15 Among many transition metal catalysts, Ni-based catalysts are generally considered to have high electrocatalytic activity and are widely studied in energy storage and conversion processes, such as supercapacitors and hydrogen evolution reactions (HER). [16][17][18] Due to its high specific capacitance, wide distribution, low toxicity, and good stability in alkaline electrolytes, Ni(OH) 2 is one of the most widely used nickel-based compounds in the field of electrocatalysis.…”

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confidence: 99%

Mn-doped Ni(OH)₂ Nanostructures as an Efficient Electrocatalyst for Methanol Oxidation in Basic Solution

Wei

Miao

2020

J. Electrochem. Soc.

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The Mn-doped Ni(OH) 2 nanostructures were obtained by a simple ion-exchange hydrothermal method. The as-prepared materials were characterized by scanning electron microscopy (SEM), energy-dispersive X-ray spectrometry (EDXS), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and Brunauer-Emmett-Teller (BET) for their morphological, composition and structural properties. As a material for modified electrodes, electrochemical tests demonstrate that the methanol oxidation peak current density of Mn-doped Ni(OH) 2 nanostructures reached 14.18 mA cm −2 at 0.596 V (vs Ag/AgCl) in NaOH electrolyte. Similarly, the Mn-doped Ni(OH) 2 nanostructures also maintained good electrocatalytic stability during the term of 36,000 s. The improvement of electrochemical performance is related to the introduction of Mn element in Ni(OH) 2 . It may promote Ni in the Mn-doped Ni(OH) 2 nanostructures to carry the lower electron density and the higher oxidation state which may be responsible for the better performance toward methanol oxidation.

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“…The high surface area and flower‐like morphology of the tested sample were confirmed through characterization techniques and electrocatalytic activity verified via electrochemical testing techniques reflect good contact between reactants and catalyst and fast electron transfer due to zinc incorporation. The Ni 0.6 Zn 0.4 O delivers ~53 mA/cm 2 current density at peak potential 1.60 V while reported Tafel slope and stability are 61.24 mV/dec and 36 000 seconds in an alkaline medium 151 …”

Section: Materials For a Methanol Oxidation Reactionmentioning

confidence: 96%

“…The Ni 0.6 Zn 0.4 O delivers 53 mA/cm 2 current density at peak potential 1.60 V while reported Tafel slope and stability are 61.24 mV/dec and 36 000 seconds in an alkaline medium. 151 Chen et al, in 2018, reported nanosheets of CuO/Co (OH) 2 composite with well-adjusted Co/Cu ratio to apply for the methanol oxidation process. The reported material with optimized Cu content favors cobalt oxidation and high binding energy, delivers maximum current density along with high surface area, turnover frequency (TOF), and low Tafel slope.…”

Section: Transition Metal-based Catalystmentioning

confidence: 99%

Recent progress in development of efficient electrocatalyst for methanol oxidation reaction in direct methanol fuel cell

2020

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The human craving for energy is continually mounting and becoming progressively difficult to Gratify. At present, the world's massive energy demands are chiefly encountered by nonrenewable and benign fossil fuels. However, the development of dynamic energy cradles for a gradually thriving world to lessen fossil fuel reserve depletion and environmental concerns are persistent issues for society at present. The discovery of copious nonconventional resources to fill the gap between energy petition and supply is the extreme obligation of the modern era. A new emergent, clean, and robust alternate of fossil fuels are the fuel cells. Among the different types of fuel cells, direct methanol fuel cells are an outstanding option for light-duty vehicles and portable devices. A critical tactic for striving and sustainable energy sources is the production of highly proficient, economical, and green catalysts for energy storage and conversion devices. Up till now a broad range of research work is available to use Pt and modify Ptbased electrocatalysts to augment the CH 3 OH oxidation process. Platinum-based nanocubes, nanorods, nanoflower, hybrids of Pt with metal-oxides such as Fe 2 O 3 , TiO 2 , SnO 2 , MnO, Cu 2 O, ZnO, and with conducting polymers are extensively utilized in both acidic and basic media. Moreover, Pd-based materials, transition metal-based materials as well as MOF and MOF-derived materials are also the point of interest for researchers nowadays. However, the problem associated with their practical applications is that they can be effectively employed in basic media due to comparative less stability in acidic medium. This review article will deliver a broad vision of the current progress of the MOR process concerning noble metals, transition metals, and MOF-based materials.

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Synthesis of 3D Flower-Like Ni0.6Zn0.4O Microspheres for Electrocatalytic Oxidation of Methanol

Cited by 7 publications

References 36 publications

Ni0.6Zn0.4O Synthesised via a Solid-State Method for Promoting Hydrogen Sorption from MgH2

Ni0.6Zn0.4O Synthesised via a Solid-State Method for Promoting Hydrogen Sorption from MgH2

Mn-doped Ni(OH)₂ Nanostructures as an Efficient Electrocatalyst for Methanol Oxidation in Basic Solution

Recent progress in development of efficient electrocatalyst for methanol oxidation reaction in direct methanol fuel cell

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Synthesis of 3D Flower-Like Ni0.6Zn0.4O Microspheres for Electrocatalytic Oxidation of Methanol

Cited by 7 publications

References 36 publications

Ni0.6Zn0.4O Synthesised via a Solid-State Method for Promoting Hydrogen Sorption from MgH2

Ni0.6Zn0.4O Synthesised via a Solid-State Method for Promoting Hydrogen Sorption from MgH2

Mn-doped Ni(OH)2 Nanostructures as an Efficient Electrocatalyst for Methanol Oxidation in Basic Solution

Recent progress in development of efficient electrocatalyst for methanol oxidation reaction in direct methanol fuel cell

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Mn-doped Ni(OH)₂ Nanostructures as an Efficient Electrocatalyst for Methanol Oxidation in Basic Solution