Three dimensional NiS2–Ni(OH)2/CNT nanostructured assembly for supercapacitor and oxygen evolution reaction

Prabakaran, K.; Ingavale, Sagar; Kakade, Bhalchandra

doi:10.1016/j.jallcom.2019.152126

Cited by 46 publications

(15 citation statements)

References 55 publications

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“…To accelerate this process, state-of-the-art catalysts based on iridium oxide (IrO 2 ) or ruthenium oxide (RuO 2 ) are usually employed. However, the scarcity and high cost of these catalysts have motivated scientists to search for alternative low-cost electrocatalysts for OER based on nonprecious metals, such as metal hydroxides, − metal oxides, − metal sulfides, − metal phosphides, − metal phosphates, − and so on. Among them, transition metal phosphates have attracted increasing attention for water splitting reactions due to their layered structures, high electrochemical activities, open frameworks with large channels/cavities, and wide variations in valence states.…”

Section: Introductionmentioning

confidence: 99%

Self-Assembly of Two-Dimensional Bimetallic Nickel–Cobalt Phosphate Nanoplates into One-Dimensional Porous Chainlike Architecture for Efficient Oxygen Evolution Reaction

et al. 2020

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The self-assembly of two-dimensional (2D) nanostructures into one-dimensional (1D) nanoarchitectures may result in materials which combine the unique physicochemical properties of 2D nanostructures with the excellent charge transport properties of 1D architectures. Herein, we report the self-stacking of 2D nickel−cobalt (Ni−Co) phosphate nanoplates into 1D chainlike architectures with the assistance of metal glycerates as self-templates. This unique selfassembly process is driven by the adsorbed ethyl glycerate on the surface of the individual nanoplates, which promotes the subsequent growth of the new nanoplate on top of the previously formed nanoplate, thereby leading to the self-stacking of these nanoplates along the vertical direction. The flexibility of the proposed method is also highlighted by the feasible preparation of nickel phosphate with the same self-assembled structure. When tested as a catalyst for oxygen evolution reaction (OER) in an alkaline medium, the bimetallic Ni−Co phosphate (derived from Ni-Co-TEP) with the nanoplate-assembled chainlike structure displays much lower overpotential (η 10 = 310 mV) and Tafel slope (68 mV dec −1 ) than its pristine counterparts. The enhanced OER activity of this bimetallic catalyst may be attributed to (i) the highly interconnected structure and the bimetallic composition which promote improved charge transport; (ii) the porous chainlike structure which provides increased number of active sites, facilitates easier electrolyte infiltration, and promotes good electrical contact with the electrolyte, and (iii) the presence of Ni 3+ and Co 3+ active sites (nickel−cobalt (oxy)hydroxides) which can promote the chemisorption of OH − and facilitate electron transfer from the OH − to the surface Ni/Co sites during OER.

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Section: Introductionmentioning

confidence: 99%

Self-Assembly of Two-Dimensional Bimetallic Nickel–Cobalt Phosphate Nanoplates into One-Dimensional Porous Chainlike Architecture for Efficient Oxygen Evolution Reaction

et al. 2020

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“…The prepared catalyst consisted of non‐noble metal based composite, thus the specific capacitance value used for calculation is 0.040 mF cm −2 . C dl was determined using following equation, 56

I_{dl} = C_{dl} \times scan rate

where I dl is capacitive current. Accordingly, I dl (F/cm 2 ) is proportional to capacitive current and scan rate, which was calculated from the slope of the curve of I dl plotted as a function of scan rate (mV/s).…”

Section: Resultsmentioning

confidence: 99%

“…The prepared catalyst consisted of non-noble metal based composite, thus the specific capacitance value used for calculation is 0.040 mF cm −2 . C dl was determined using following equation, 56 I dl = C dl × scan rate ð10Þ…”

Section: Electrochemical Measurementsmentioning

confidence: 99%

Microwave‐assisted synthesis of cobalt‐polyoxometalate @carbon black nanocomposites and their electrocatalytic ability toward oxygen reduction reaction

et al. 2020

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Improving the stability and efficiency of non-noble metal based ORR (oxygen reduction reaction) electrocatalyst is crucial for the commercialization of fuel cell technology. Here, we report the synthesis of cobalt-polyoxometalate nanocomposite with carbon (CoP@C) by greener strategy, which shows an interesting enhancement in the kinetics of oxygen electroreduction process. The CoP@C nanocomposite exhibited improved catalytic activity toward ORR with E onset 1.00 V vs RHE and current density of 4.2 mA/cm 2 at 1600 rpm in alkaline condition. Further, CoP@C electrocatalyst showed a single step 4 electron transfer pathway, high tolerance to methanol, and exhibited superior stability compared with 20 wt% Pt/C. Thus, CoP@C could be a cheaper and potential candidate for ORR electrocatalysis in fuel cells. The superiority of the catalyst in terms of activity and durability arises due to the uniform distribution of cobalt-polyoxometalate nanoclusters on carbon surface and the synergetic effect of POM, cobalt, and carbon.

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“…The Nyquist plots exhibited a linear relationship, which may be ascribed to the dual function of the metal oxyhydroxide for the OER and as a supercapacitor. [55][56][57] It was revealed that the Co 1 Ni 6 CH electrode showed the lowest series resistance and charge-transfer resistance, indicating that Co doping could improve the conductivity. This analysis agreed with previous results.…”

Section: Oer Performance In 1 M Kohmentioning

confidence: 99%

Enhanced oxygen evolution performance by the partial phase transformation of cobalt/nickel carbonate hydroxide nanosheet arrays in an Fe-containing alkaline electrolyte

Liu

Cai

et al. 2022

Inorg. Chem. Front.

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Three dimensional NiS2–Ni(OH)2/CNT nanostructured assembly for supercapacitor and oxygen evolution reaction

Cited by 46 publications

References 55 publications

Self-Assembly of Two-Dimensional Bimetallic Nickel–Cobalt Phosphate Nanoplates into One-Dimensional Porous Chainlike Architecture for Efficient Oxygen Evolution Reaction

Self-Assembly of Two-Dimensional Bimetallic Nickel–Cobalt Phosphate Nanoplates into One-Dimensional Porous Chainlike Architecture for Efficient Oxygen Evolution Reaction

Microwave‐assisted synthesis of cobalt‐polyoxometalate @carbon black nanocomposites and their electrocatalytic ability toward oxygen reduction reaction

Enhanced oxygen evolution performance by the partial phase transformation of cobalt/nickel carbonate hydroxide nanosheet arrays in an Fe-containing alkaline electrolyte

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