Simple room temperature synthesis of porous nickel phosphate foams for electrocatalytic ethanol oxidation

Sharma, Pratigya; Radhakrishnan, Shankar; Khil, Myung-Seob; Kim, Hee Young; Kim, Byoung‐Suhk

doi:10.1016/j.jelechem.2017.12.025

Cited by 30 publications

(23 citation statements)

References 27 publications

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“…Ethanol is a nontoxic liquid and can be derived from biomass, which has high energy density compared to methanol. Transition metals acting as an electron transfer mediator utilized as a catalyst on the electrochemical oxidation of ethanol and its role in metal-support interactions are widely reported. − However, binary metal oxides with the effect of dopants could be a different approach to evaluate the electrochemistry of being a suitable catalyst.…”

Section: Results and Discussionmentioning

confidence: 99%

Zn Metal Atom Doping on the Surface Plane of One-Dimesional NiMoO₄ Nanorods with Improved Redox Chemistry

Sharma

Minakshi

Watcharatharapong

et al. 2020

ACS Appl. Mater. Interfaces

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The effect of zinc (Zn) doping and defect formation on the surface of nickel molybdate (NiMoO 4 ) structures with varying Zn content has been studied to produce one-dimensional electrodes and catalysts for electrochemical energy storage and ethanol oxidation, respectively. Zn-doped nickel molybdate (Ni 1-x Zn x MoO 4 , where x = 0.1, 0.2, 0.4, and 0.6) nanorods were synthesized by a simple wet chemical route. The optimal amount of Zn is found to be around 0.25 above which the NiMoO 4 becomes unstable, resulting in poor electrochemical activity. This result agrees with our density functional theory calculations in which the thermodynamic stability reveals that Ni 1-x Zn x MoO 4 crystallized in the β-NiMoO 4 phase and is found to be stable for x≤0.25. Analytical techniques show direct evidence of the presence of Zn in the NiMoO 4 nanorods, which subtly alter the electrocatalytic activity. Compared with pristine NiMoO 4 , Zn-doped NiMoO 4 with the optimized Zn content was tested as an electrode for an asymmetric supercapacitor and demonstrated an enhanced specific capacitance of 122 F g −1 with a high specific energy density of 43 W h kg −1 at a high power density of 384 W kg −1 . Our calculations suggest that the good conductivity from Zn doping is attributed to the formation of excess oxygen vacancies and dopants play an important role in enhancing the charge transfer between the surface and OH − ions from the electrolyte. We report electrochemical testing, material characterization, and computational insights and demonstrate that the appropriate amount of Zn in NiMoO 4 can improve the storage capacity (∼15%) due to oxygen vacancy interactions.

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Section: Results and Discussionmentioning

confidence: 99%

Zn Metal Atom Doping on the Surface Plane of One-Dimesional NiMoO₄ Nanorods with Improved Redox Chemistry

Sharma

Minakshi

Watcharatharapong

et al. 2020

ACS Appl. Mater. Interfaces

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“…The past investigation suggested that the crystallinity of transition-metal phosphates will be improved after annealing process . Therefore, we conducted an additional electrochemical examination regarding the postheat treatment of NFPy and NFPy–CNT (Figure S4) at 500 °C in H 2 /Ar (5%) for electrochemical applications.…”

Section: Resultsmentioning

confidence: 99%

“…The past investigation suggested that the crystallinity of transition-metal phosphates will be improved after annealing process. 68 Therefore, we conducted an additional electrochemical examination regarding the postheat treatment of NFPy and NFPy−CNT (Figure S4) at 500 °C in H 2 /Ar (5%) for electrochemical applications. Similar results were obtained for both NFPy (Figure S4a) and NFPy−CNT (Figure S4b) that the overall electrochemical performance was declined after the improvement of crystallinity.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Ambient Temperature Synthesis of Iron-Doped Porous Nickel Pyrophosphate Nanoparticles with Long-Term Chemical Stability for High-Performance Oxygen Evolution Reaction Catalysis and Supercapacitors

Kim

Kang

Yan

et al. 2020

ACS Sustainable Chem. Eng.

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Recently, transition-metal phosphides and phosphates have been recognized as candidates for electrochemical energy storage and conversion application. However, the preparation of such materials usually requires high energy consumption and toxic precursors which are considered to be drawbacks for real applications. In this study, we report ambient temperature synthesis of transition-metal phosphates for oxygen evolution reaction (OER) and supercapacitors. The prepared iron-doped porous nickel pyrophosphate (NFPy) nanoparticle is synthesized via simple stirring in ambient temperature using only the precursor for Ni, Fe, and pyrophosphate without any heat treatment. The usage of pyrophosphate promotes facile Ni oxidation and high chemical stability, which overall is beneficial for electrochemical applications and the environment. The OER performance of NFPy shows promising results which required an overpotential of 0.210 V to reach 10 mA·cm–2. Also, with the help of carbon nanotubes, the supercapacitor using NFPy exhibits a good electrochemical performance with a capacity of 517 C·g–1 at 1 A·g–1. The prepared NFPy possesses excellent long-term chemical stability that maintained its chemical valence state and electrochemical performance for over 8 months despite the exposure of air.

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“…This mainly benefits from the high surface area of Ni foam and the advanced catalytic behavior of Au nanoparticles. Moreover, porous Ni phosphate has been synthesized and used as an efficient catalyst for EOR in alkaline media [114,115]. advanced catalytic behavior of Au nanoparticles.…”

Section: Development Of Non-noble Metal Catalysts For Eormentioning

confidence: 99%

“…advanced catalytic behavior of Au nanoparticles. Moreover, porous Ni phosphate has been synthesized and used as an efficient catalyst for EOR in alkaline media [114,115]. Other non-precious alloys based on Co and Fe alloys have also attracted considerable attention.…”

Section: Development Of Non-noble Metal Catalysts For Eormentioning

confidence: 99%

Advanced Catalytic Materials for Ethanol Oxidation in Direct Ethanol Fuel Cells

et al. 2020

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Direct ethanol fuel cells (DEFCs) have emerged as promising and advanced power systems that can considerably reduce fossil fuel dependence, and thus have attracted worldwide attention. DEFCs have many apparent merits over the analogous devices fed with hydrogen or methanol. As the key constituents, the catalysts for both cathodes and anodes usually face some problems (such as high cost, low conversion efficiency, and inferior durability) that hinder the commercialization of DEFCs. This review mainly focuses on the most recent advances in nanostructured catalysts for anode materials in DEFCS. First, we summarize the effective strategies used to achieve highly active Pt- and Pd-based catalysts for ethanol electro-oxidation, including composition control, microstructure design, and the optimization of support materials. Second, a few non-precious catalysts based on transition metals (such as Fe, Co, and Ni) are introduced. Finally, we outline the concerns and future development of anode catalysts for DEFCs. This review provides a comprehensive understanding of anode catalysts for ethanol oxidation in DEFCs.

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Simple room temperature synthesis of porous nickel phosphate foams for electrocatalytic ethanol oxidation

Cited by 30 publications

References 27 publications

Zn Metal Atom Doping on the Surface Plane of One-Dimesional NiMoO₄ Nanorods with Improved Redox Chemistry

Zn Metal Atom Doping on the Surface Plane of One-Dimesional NiMoO₄ Nanorods with Improved Redox Chemistry

Ambient Temperature Synthesis of Iron-Doped Porous Nickel Pyrophosphate Nanoparticles with Long-Term Chemical Stability for High-Performance Oxygen Evolution Reaction Catalysis and Supercapacitors

Advanced Catalytic Materials for Ethanol Oxidation in Direct Ethanol Fuel Cells

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Simple room temperature synthesis of porous nickel phosphate foams for electrocatalytic ethanol oxidation

Cited by 30 publications

References 27 publications

Zn Metal Atom Doping on the Surface Plane of One-Dimesional NiMoO4 Nanorods with Improved Redox Chemistry

Zn Metal Atom Doping on the Surface Plane of One-Dimesional NiMoO4 Nanorods with Improved Redox Chemistry

Ambient Temperature Synthesis of Iron-Doped Porous Nickel Pyrophosphate Nanoparticles with Long-Term Chemical Stability for High-Performance Oxygen Evolution Reaction Catalysis and Supercapacitors

Advanced Catalytic Materials for Ethanol Oxidation in Direct Ethanol Fuel Cells

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Zn Metal Atom Doping on the Surface Plane of One-Dimesional NiMoO₄ Nanorods with Improved Redox Chemistry

Zn Metal Atom Doping on the Surface Plane of One-Dimesional NiMoO₄ Nanorods with Improved Redox Chemistry