One-pot hydrothermal synthesis of porous nickel cobalt phosphides with high conductivity for advanced energy conversion and storage

Hu, Yumei; Liu, Mao‐Cheng; Hu, Yuxia; Yang, Qingqing; Kong, Ling‐Bin; Kang, Long

doi:10.1016/j.electacta.2016.08.074

Cited by 159 publications

(62 citation statements)

References 78 publications

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“…The ASC in this work delivers an energy density of 34 Wh kg −1 at the power density of 775 W kg −1 and it retains 20 Wh kg −1 at a high power density of ≈11600 W kg −1 . Our NiCoP/NiCo‐OH30//PC ASC demonstrates superior performance compared with those reported phosphide‐based ASCs (Figure f), such as Ni‐P@MnO 2 //activated carbon (AC) (17 Wh kg −1 at 350 W Kg −1 ), CoP//AC (19 Wh kg −1 at 350 W Kg −1 ), Ni‐P@NiCo 2 O 4 //AC (21 Wh kg −1 at 350 W Kg −1 ), NiCoP//AC (32 Wh kg −1 at 350 W Kg −1 ), NiP@CoAl layer double hydroxide (CoAl‐LDH)//AC (37 Wh kg −1 at 450 W Kg −1 ), and those in references . It therefore holds great promise for high performance energy storage devices.…”

Section: Resultsmentioning

confidence: 79%

Cactus‐Like NiCoP/NiCo‐OH 3D Architecture with Tunable Composition for High‐Performance Electrochemical Capacitors

Elshahawy

et al. 2018

Adv Funct Materials

292

191

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To effectively enhance the energy density and overall performance of electrochemical capacitors (ECs), a new strategy is demonstrated to increase both the intrinsic activity of the reaction sites and their density. Herein, nickel cobalt phosphides (NiCoP) with high activity and nickel cobalt hydroxides (NiCo-OH) with good stability are purposely combined in a hierarchical cactus-like structure. The hierarchical electrode integrates the advantages of 1D nanospines for effective charge transport, 2D nanoflakes for mechanical stability, and 3D carbon cloth substrate for flexibility. The NiCoP/ NiCo-OH 3D electrode delivers a high specific capacitance of ≈1100 F g −1 , which is around seven times higher than that of bare NiCo-OH. It also possesses ≈90% capacitance retention after 1000 charge-discharge cycles. An asymmetric supercapacitor composed of NiCoP/NiCo-OH cathode and metal-organic framework-derived porous carbon anode achieves a specific capacitance of ≈100 F g −1 , high energy density of ≈34 Wh kg −1 , and excellent cycling stability. The cactus-like NiCoP/NiCo-OH 3D electrode presents a great potential for ECs and is promising for other functional applications such as catalysts and batteries.

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Section: Resultsmentioning

confidence: 79%

Cactus‐Like NiCoP/NiCo‐OH 3D Architecture with Tunable Composition for High‐Performance Electrochemical Capacitors

Elshahawy

et al. 2018

Adv Funct Materials

292

191

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“…Fig. 6d shows a comparison of the energy density and power density of NiCo-P-6/NF||AC ASC with other reported capacitors [27,28,42,[61][62][63][64][65][66]. NiCo-P-6/NF||AC ASC is superior to many other nickel-cobalt-based capacitors, regardless of energy density or power density.…”

Section: Resultsmentioning

confidence: 90%

“…Especially, the TMPs have better electrical conductivity [23] compared with corresponding oxides, which makes it a new growth point in the energy-storage field [24,25]. Researchers pay much attention to the synthesis of phosphide [26][27][28][29][30][31][32][33][34]. The phosphide nanowires [26], nanoparticles [27,28] and nanosheets [29,30] are suitable for supercapacitor.…”

Section: Introductionmentioning

confidence: 99%

Porous NiCoP nanowalls as promising electrode with high-area and mass capacitance for supercapacitors

Zhang

et al. 2019

Sci. China Mater.

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The design of the electrode with high-area and mass capacitance is important for the practical application of supercapacitors. Here, we fabricated the porous NiCoP nanowalls supported by Ni foam (NiCo-P/NF) for supercapacitors with win-win high-area and mass capacitance. The NiCoOH nanowall precursor was prepared by controlling the deposition rate of Ni 2+ and Co 2+ on NF through a sodium acetate-assisted (floride-free) process. After the phosphorization, the NiCo-P nanowalls formed with high loading about 8.6 mg cm −2 on NF. The electrode combined several advantages favorable for energy storage: the plentiful pores beneficial for ion transport, the nanowalls for easy accommodation of electrolyte, good conductivity of NiCo-P for easy transport of electrons. As expected, the NiCo-P/NF exhibited a high specific mass capacitance (1,861 F g −1 at 1 A g −1 , 1,070 F g −1 at 10 A g −1 ), and high area capacitance (17.31 F cm −2 at 5 mA cm −2 and 10 F cm −2 at 100 mA cm −2 ). The asymmetric supercapacitor (ASC) composed of NiCo-P/ NF positive electrode coupled with commercial active carbon negative electrode exhibited a high energy density of 44.9 W h kg −1 at a power density of 750 W kg −1 . The ASC can easily drive fans, electronic watch and LED lamps, implying their potential for the practical application.

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“…As shown in Figure a, there is a distinct reduction peak under various scan rates from 5 to 30 mV s −1 , not an ideal rectangular shape, and the double‐layer capacitance characteristic of these curves is not pronounced, indicating that the capacitance characteristics are mainly because of pseudocapacitive processes, which are attributed to the Faradic pseudocapacitance of nickel–cobalt phosphate. It may be mainly because there is slight charge imbalance of two electrodes and the resistance of the PVA/KOH gel electrolyte is slightly larger than that of aqueous electrolyte, which does not affect the charge and discharge performance of the supercapacitor . Interestingly, the shape of the CV curve can still be kept even at large scan rate of 30 mV s −1 , which manifests a good rate capability of the device.…”

Section: Resultsmentioning

confidence: 98%

Ultrathin Nickel–Cobalt Phosphate 2D Nanosheets for Electrochemical Energy Storage under Aqueous/Solid‐State Electrolyte

Feng

et al. 2017

Adv Funct Materials

382

191

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2D materials are ideal for constructing flexible electrochemical energy storage devices due to their great advantages of flexibility, thinness, and transparency. Here, a simple one‐step hydrothermal process is proposed for the synthesis of nickel–cobalt phosphate 2D nanosheets, and the structural influence on the pseudocapacitive performance of the obtained nickel–cobalt phosphate is investigated via electrochemical measurement. It is found that the ultrathin nickel–cobalt phosphate 2D nanosheets with an Ni/Co ratio of 4:5 show the best electrochemical performance for energy storage, and the maximum specific capacitance up to 1132.5 F g−1. More importantly, an aqueous and solid‐state flexible electrochemical energy storage device has been assembled. The aqueous device shows a high energy density of 32.5 Wh kg−1 at a power density of 0.6 kW kg−1, and the solid‐state device shows a high energy density of 35.8 Wh kg−1 at a power density of 0.7 kW kg−1. These excellent performances confirm that the nickel–cobalt phosphate 2D nanosheets are promising materials for applications in electrochemical energy storage devices.

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One-pot hydrothermal synthesis of porous nickel cobalt phosphides with high conductivity for advanced energy conversion and storage

Cited by 159 publications

References 78 publications

Cactus‐Like NiCoP/NiCo‐OH 3D Architecture with Tunable Composition for High‐Performance Electrochemical Capacitors

Cactus‐Like NiCoP/NiCo‐OH 3D Architecture with Tunable Composition for High‐Performance Electrochemical Capacitors

Porous NiCoP nanowalls as promising electrode with high-area and mass capacitance for supercapacitors

Ultrathin Nickel–Cobalt Phosphate 2D Nanosheets for Electrochemical Energy Storage under Aqueous/Solid‐State Electrolyte

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