Hydrothermal synthesis of CoMoO 4 /Co 1- x S hybrid on Ni foam for high-performance supercapacitors

Ge, Jinhua; Wu, Jihuai; Fan, Leqing; Bao, Quanlin; Dong, Jia; Jia, Jinbiao; Lin, Jianming

doi:10.1016/j.jechem.2017.11.014

Cited by 38 publications

(20 citation statements)

References 46 publications

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“…Studies have shown that Co/Ni based materials exhibited high electrocatalytic OER activity in alkaline solutions . These materials included cobalt (nickel) oxides/hydroxide, Co(Ni)Fe layered double hydroxides (LDHs), cobalt (nickel) molybdate, cobalt (nickel) sulfides, cobalt (nickel) selenides, cobalt (nickel) nitrides, and cobalt (nickel) phosphides . However, due to the low active surface area and the poor electrical conductivity, the performance of these electrocatalysts still does not meet the requirements for practical applications.…”

Section: Introductionmentioning

confidence: 99%

In‐situ Growth of a Bimetallic Cobalt‐Nickel Organic Framework on Iron Foam: Achieving the Electron Modification on a Robust Self‐supported Oxygen Evolution Electrode

Luo

Zhao

et al. 2019

ChemCatChem

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As a clean energy source, hydrogen may be obtained via overall water splitting. However, the reaction is limited by the anodic oxygen evolution reaction (OER) in the catalytic field. In order to overcome the limitation in OER catalyst activity, this paper attempts to synthesize and develop a series of three-dimensional metal-organic frameworks (MOFs) electrocatalytic materials. The structure and morphology of bimetallic cobalt and nickel MOFs are characterized by FT-IR, Raman, SEM, TEM, and XPS. It is found that the bimetallic cobalt and nickel MOFs have a columnar micro-structure assembled by nanosheets. Further in-situ growth on the iron (Fe) foam to prepare an integrated nanoarray self-supported electrode did not significant change their micro-structure. The obtained bimetal electrocatalysts exhibit significantly enhanced OER activity as compared to the single-metal MOFs counterpart. The cobalt and nickel doubledoped materials in-situ grown on Fe foam exhibited an excellent electrocatalytic activity and remarkable durability with a current density of 10 mA cm À 2 in a 0.1 M KOH solution (with the overpotential of 264 mV and the Tafel slope of 54.3 mV dec À 1 ). There is a significant improvement compared with the material on the glassy carbon electrode. The introduction of the bimetal species (Co and Ni) into the ordered MOFs provides a synergistic effect of the active centers resulting in an enhanced electron transfer and improved electrochemical performance. This work enriches the MOFs electrocatalytic electrode and pave the way for their practical applications.[a] Dr.Reagent: All reagents and materials in this experiment were obtained commercially and were used as received without any further purification. 1,2,4,5-Benzenetetracarboxylic acid (H 4 btec 98 %, AR), NiCl 2 ·6H 2 O (98 %, AR), CoCl 2 ·6H 2 O (98 %, AR), NaOH (96 %, AR), KOH (96 %, AR) and the Nafion solution (5 wt.%) were purchased from J&K Chemical Co. The ultrapure water (18 MΩ cm) was supplied by a Millipore System (Millipore Q). The thickness of iron foam was 0.5 mm. Synthesis of [M 2 (btec)(H 2 O)4]·2H 2 O (M = Ni and Co):The [M 2 (btec) (H 2 O) 4 ]·2H 2 O was synthesized via a hydrothermal process, as previously reported and with minor modifications. [44] The specific synthesis process is as follows: 1.4 mmol of MCl 2 ·6H 2 O (M: Co, Ni, or Co/Ni mixed with 1 : 1 in at.%) and 0.94 mmol of H 4 btec were dissolved in 10 mL ultrapure water, then the pH was adjusted by 2.2 mmol of NaOH. Afterwards, the as-prepared mixture solution was transferred into a 25 mL Teflon stainless-steel autoclave, and heated at 110°C for 72 h. After that, the autoclave was cooled to room temperature, the as-prepared three-dimensional (3D) MOFs were collected after being washed with ultrapure water and dried at 60°C in an oven. The as-obtained red crystals of 3D-CoMOFs were obtained with a yield of 78.6 %, the green crystals of 3D-NiMOFs with a yield of 85.2 %, and the brown crystals of 3DÀ Co/ NiMOFs with a yield of 80.6 %, respectively ( Figure S1). In-situ synthe...

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Section: Introductionmentioning

confidence: 99%

In‐situ Growth of a Bimetallic Cobalt‐Nickel Organic Framework on Iron Foam: Achieving the Electron Modification on a Robust Self‐supported Oxygen Evolution Electrode

Luo

Zhao

et al. 2019

ChemCatChem

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“…It is still very challenging to obtain high cyclic stability as most of them lose performance after going through multiple folding/bending cycles. One of the possible avenues is to use three‐dimensional foam as flexible substrate that can provide high accessible surface area and pore geometry to accommodate electro active species with high affinity . In such context, carbon/graphite‐based foams could be more suitable due to their high chemical stability than the metallic foams …”

Section: Introductionmentioning

confidence: 99%

“…One of the possible avenues is to use threedimensional foam as flexible substrate that can provide high accessible surface area and pore geometry to accommodate electro active species with high affinity. [23][24][25][26] In such context, carbon/graphite-based foams could be more suitable due to their high chemical stability than the metallic foams. 26 In this work, we have used a novel approach to electrodeposit PANI nanowires on the pore walls of polyacrylonitrile (PAN) graphite foam (GF).…”

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confidence: 99%

Flexible supercapacitor based on three‐dimensional cellulose/graphite/polyaniline composite

et al. 2018

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Summary Fast charge‐discharge rate and high areal capacitance, along with high mechanically stability, are the pre‐requisites for flexible supercapacitors to power flexible electronic devices. In this paper, we have used three‐dimensional polyacrylonitrile graphite foam as flexible current collector for electro‐deposition of polyaniline (PANI) nanowires. The graphite foam with PANI was then used to fabricate symmetric supercapacitor. The fabricated supercapacitor in the three‐electrode system shows a high specific capacitance (Csp) of 357 F.g−1 and areal capacitance (Careal) of 7142 mF.cm−2 in 1 M H2SO4 at current density of 80 mA.cm−2, while using two‐electrode system, it shows Csp of 256 F.g−1 and Careal of 5120 mF.cm−2 in 1 M H2SO4 at current density of 100 mA.cm−2. The current density of 100 mA.cm−2 is up to 10 folds higher than reported current densities of many PANI‐based supercapacitors. The high capacitance can be attributed to the spongy network of PANI‐NWs on three‐dimensional graphite surface which provides an easy path for electrolyte ions in active electrode materials. The developed supercapacitor shows specific energy of 64.8 Whkg−1 and a specific power of 6.1 kWkg−1 with a marginally decrease of 1.6% in Csp after 1000th cycles, along with coulombic efficiency retention of 87% in polyvinyl alcohol/H2SO4 gel electrolyte. This flexible supercapacitor exhibits great potential for energy storage application.

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“…Some demonstrations have already been reported. [25][26][27][28][29] Based on the above discussed approach, in this work, we assembled a flexible supercapacitor using hydrothermally synthesized nanorods of MnO 2 which are in situ grown on CC substrate. The main objective of this work is to investigate performance analysis of the developed supercapacitor under different operating conditions.…”

Section: Introductionmentioning

confidence: 99%

Carbon cloth‐MnO₂ nanotube composite for flexible supercapacitor

et al. 2020

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Three-dimensional MnO 2 nanorods were synthesized on a carbon cloth (CC) via hydrothermal method to fabricate binder-free electrode for flexible supercapacitor application. The fabricated MnO 2 /CC electrode exhibits specific capacitance of 487 F g −1 at current density of 2 A g −1 in conventional three electrode system using 1 M Na 2 SO 4 electrolyte. Furthermore, a flexible symmetric supercapacitor is assembled using 1 M Na 2 SO 4 electrolyte which shows maximum specific capacitance of 232 F g −1 at current density of 0.5 A g −1. The supercapacitor exhibits specific energy up to 5.18 Wh kg −1 and specific power of 242 W kg −1 at 0.5 and 1.0 A g −1 , respectively. Furthermore, the supercapacitor exhibits specific capacitance retention of 91.7% over 1000 charging discharging cycles. The attractive performance suggests that MnO 2 /CC supercapacitor has potential application for energy storage.

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Hydrothermal synthesis of CoMoO 4 /Co 1- x S hybrid on Ni foam for high-performance supercapacitors

Cited by 38 publications

References 46 publications

In‐situ Growth of a Bimetallic Cobalt‐Nickel Organic Framework on Iron Foam: Achieving the Electron Modification on a Robust Self‐supported Oxygen Evolution Electrode

In‐situ Growth of a Bimetallic Cobalt‐Nickel Organic Framework on Iron Foam: Achieving the Electron Modification on a Robust Self‐supported Oxygen Evolution Electrode

Flexible supercapacitor based on three‐dimensional cellulose/graphite/polyaniline composite

Carbon cloth‐MnO₂ nanotube composite for flexible supercapacitor

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Hydrothermal synthesis of CoMoO 4 /Co 1- x S hybrid on Ni foam for high-performance supercapacitors

Cited by 38 publications

References 46 publications

In‐situ Growth of a Bimetallic Cobalt‐Nickel Organic Framework on Iron Foam: Achieving the Electron Modification on a Robust Self‐supported Oxygen Evolution Electrode

In‐situ Growth of a Bimetallic Cobalt‐Nickel Organic Framework on Iron Foam: Achieving the Electron Modification on a Robust Self‐supported Oxygen Evolution Electrode

Flexible supercapacitor based on three‐dimensional cellulose/graphite/polyaniline composite

Carbon cloth‐MnO2 nanotube composite for flexible supercapacitor

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Product

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Carbon cloth‐MnO₂ nanotube composite for flexible supercapacitor