Synthesis of hydrous cobalt phosphate electro-catalysts by a facile hydrothermal method for enhanced oxygen evolution reaction: effect of urea variation

Katkar, Pranav K.; Marje, Supriya J.; Kale, Shital B.; Lokhande, A.C.; Lokhande, C.D.; Patil, Umakant M.

doi:10.1039/c8ce01653d

Cited by 45 publications

(26 citation statements)

References 53 publications

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“…This may be attributed to the large SSA of CoP‐300‐1, resulting in a faster redox reaction process, a smaller R ct and a higher C dl 48 . The high capacitance and low impedance indicate that CoP‐300‐1 improves the electron transfer rate, while the higher conductivity facilitates charge transfer 39,49,50 . These results confirm that the CoP‐300‐1 catalyst has an efficient catalytic activity for HER.…”

Section: Resultsmentioning

confidence: 65%

“…A higher electric double layer capacitance indicates that CoP has a larger electrochemical surface area. Meanwhile, a higher electrical conductivity facilitates the charge transfer 49 …”

Section: Resultsmentioning

confidence: 99%

“…Meanwhile, a higher electrical conductivity facilitates the charge transfer. 49 In addition, the effect of the phosphating time on electrochemical properties for HER has been further studied on the CoP-300 electrocatalyst. The overpotential of CoP-300-1 electrocatalyst is 130 mV ( Figure 5A and Table S4), only a little bit higher than that of the 20% Pt/C electrode.…”

Section: Resultsmentioning

confidence: 99%

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Urchin‐like CoP nanomaterial as an electrocatalyst for efficient hydrogen evolution reaction

et al. 2020

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Summary The morphology and structure of the electrocatalysts are important factors affecting their performance for electrochemical splitting water into hydrogen. Herein, the urchin‐like CoP nanomaterials with the large specific surface area (SSA) were fabricated through the solvothermal process and the solid‐gas reaction for hydrogen evolution reaction (HER). The resulting CoP nanomaterial with a diameter of approximately 4 μm was assembled by the nanowires with a length of about 10 nm. The excellent performance is accessible for HER with a small overpotential of 130 mV and a low Tafel slope of 52 mV/decade in a 0.5 M H2SO4 aqueous solution. Especially, the resulting urchin‐like CoP nanomaterials with a large SSA and electric double‐layer capacitance lower the electrochemical impedance and accelerate the electron transfer, endowing the excellent performance for HER process.

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Section: Resultsmentioning

confidence: 65%

“…A higher electric double layer capacitance indicates that CoP has a larger electrochemical surface area. Meanwhile, a higher electrical conductivity facilitates the charge transfer 49 …”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Urchin‐like CoP nanomaterial as an electrocatalyst for efficient hydrogen evolution reaction

et al. 2020

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“…The initial observed current density is 10.4 mA/cm 2 that got increased to 11.2 mA/cm 2 after 2 h and thereafter, it has remained stable. This slight increment is probably due to surface hydration and structural changes of water on catalyst surface during OER …”

Section: Resultsmentioning

confidence: 99%

Nickel Cobalt Phosphite Nanorods Decorated with Carbon Nanotubes as Bifunctional Electrocatalysts in Alkaline Medium with a High Yield of Hydrogen Peroxide

2020

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It is highly desirable to develop an energy generation system comprising a low-cost and earth-abundant non-noble metal catalyst for bifunctional electrocatalysis with good overall process performance, especially for applications in fuel cells or metal-air batteries. In this report, we show that nickel cobalt phosphite (NiCoÀ Phi) decorated with carbon nanotubes (CNTs) can perform as a bifunctional electrocatalyst for the oxygen evolution and oxygen reduction reactions (OER and ORR, respectively). The NiCoÀ Phi/CNT composite is synthesized by employing a simple, single-step hydrothermal method. The morphology of the composite consists of nanorod bundles of NiCoÀ Phi decorated with CNTs. The synthesized NiCoÀ Phi/CNT composite exhibits enhanced electrochemical OER activity with an overpotential of 400 mV at a current density of 10 mA/cm 2 and a Tafel slope value of 117 mV dec À 1 in 1 M KOH, possessing high stability towards the OER for 20 h. The ORR using the same catalyst shows an onset potential of 0.75 V and a Tafel slope of 100 mV dec À 1 in 0.1 M KOH with high-yield production of H 2 O 2 (85 %). The predominant formation of H 2 O 2 occurs mainly through a two-electron transfer process, as established by mass-controlled kinetic studies and has not been observed previously in these phosphorous oxy anion-based materials. The superior bifunctional nature of NiCoÀ Phi/CNT towards the OER and ORR arises from the synergistic effect of doped metal phosphites and CNTs.

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“…As compared with reported synthesis methods, hydrothermal is a chemical method to prepare various metal oxide materials in thin film form with various porous nanostructured surface morphologies on different type of substrates (conducting or non-conducting). It is a convenient, facile and binder free method for large area deposition of different materials [21].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical behavior of hydrothermally synthesized porous groundnuts-like samarium oxide thin films

et al. 2020

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One pot hydrothermal method is used for synthesis of groundnuts-like samarium oxide (Sm 2 O 3) thin film on stainless steel substrate. The Sm 2 O 3 film is characterized by X-ray diffraction, water contact angle, UV-visible spectrophotometer, photoluminescence, and field emission scanning electron microscopy techniques. The hydrothermal method allows the formation of cubic Sm 2 O 3 film with porous groundnuts-like morphology. The Sm 2 O 3 film is hydrophilic with the optical band gap of 3.70 eV. Electrochemical capacitive behavior of Sm 2 O 3 film is studied using cyclic voltammetry, galvanostatic charge-discharge measurement and electrochemical impedance spectroscopy. The Sm 2 O 3 film exhibits maximum specific capacitance of 155 Fg −1 at 5 mVs −1 scan rate in 1 M KOH electrolyte.

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Synthesis of hydrous cobalt phosphate electro-catalysts by a facile hydrothermal method for enhanced oxygen evolution reaction: effect of urea variation

Abstract: Highly active hydrous cobalt phosphate thin film electro-catalysts were synthesized by one-pot hydrothermal method and were evaluated for the oxygen evolution reaction (OER).

Cited by 45 publications

References 53 publications

Urchin‐like CoP nanomaterial as an electrocatalyst for efficient hydrogen evolution reaction

Urchin‐like CoP nanomaterial as an electrocatalyst for efficient hydrogen evolution reaction

Nickel Cobalt Phosphite Nanorods Decorated with Carbon Nanotubes as Bifunctional Electrocatalysts in Alkaline Medium with a High Yield of Hydrogen Peroxide

Electrochemical behavior of hydrothermally synthesized porous groundnuts-like samarium oxide thin films

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