FeCo<sub>2</sub>S<sub>4</sub> Nanosheet Arrays Supported on Ni Foam: An Efficient and Durable Bifunctional Electrocatalyst for Overall Water-Splitting

Hu, Jingrui; Ou, Yingqing; Li, Yanhong; Gao, Di; Zhang, Yunhuai; Xiao, Peng

doi:10.1021/acssuschemeng.8b01978

Cited by 91 publications

(34 citation statements)

References 59 publications

(122 reference statements)

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“…Inc. of Co/Ni-CW and reported bifunctional catalysts. [45][46][47][48][49][50][51][52][53][54][55][56][57] www.afm-journal.de www.advancedsciencenews.com 2010951 (8 of 10) S19, Supporting Information). [45][46][47][48][49][50][51][52] Moreover, the Co/Ni-CW electrode exhibits appropriate stability with ≈20% current density loss under the current density of 10 mA cm -2 for 48 h (Figure 5c).…”

Section: Resultsmentioning

confidence: 99%

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Carbonized Wood Decorated with Cobalt‐Nickel Binary Nanoparticles as a Low‐Cost and Efficient Electrode for Water Splitting

Gan

Wang

et al. 2021

Adv Funct Materials

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Using an inexpensive and eco-friendly wood substrate, herein, a one-step calcination method is developed to deposit Co-Ni binary nanoparticles into aligned wood channels and an effective carbonized wood (CW) electrode (termed as Co/Ni-CW) is fabricated. Well distributed Co-Ni nanoparticles are achieved by the coordination bonds between the hydroxyl groups on wood matrix and soaked metal cations. Subsequently, high-temperature calcination promotes the nucleation of Co-Ni nanoparticles and the formation of CW. With the uniform distribution of Co-Ni nanoparticles and porous wood structure, not only is a high active surface area, but also the electron and mass diffusion pathways are enhanced. Thus, the as-prepared Co/Ni-CW affords the current density of 10 mA cm -2 at low overpotentials of 330 and 157 mV for oxygen and hydrogen evolution, respectively. Remarkably, when the wood-based bifunctional electrocatalyst is used as both the anode and cathode, a low cell voltage of 1.64 V is required to reach the current density of 10 mA cm -2 . Compared with most substrates used in bifunctional electrocatalysts, the abundance, low cost, eco-friendliness, and easy operation of woodbased catalysts allow for an active and scalable electrode for water splitting and many other energy storage devices.

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Section: Resultsmentioning

confidence: 99%

“…f) Comparison of cell voltages at a current density of 10 mA cm-2 and the substrate materials costs found in Amazon. Inc. of Co/Ni-CW and reported bifunctional catalysts [45][46][47][48][49][50][51][52][53][54][55][56][57].…”

mentioning

confidence: 99%

Carbonized Wood Decorated with Cobalt‐Nickel Binary Nanoparticles as a Low‐Cost and Efficient Electrode for Water Splitting

Gan

Wang

et al. 2021

Adv Funct Materials

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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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“…For overall water splitting in 1.0 M KOH, Lin et al . have observed that Ni 3 S 2 −Co 9 S 8 nano array on Ni foam exhibits enhanced activity (1.55 V at 10 mA cm −2 ) and stability (12 h), while Hu et al . have observed that FeCo 2 S 4 nanosheet array on Ni foam exhibits enhanced activity (1.56 V at 10 mA cm −2 ) and stability (20 h), and Li et al .…”

Section: Constructing Earth‐abundant 3d Nanoarrays For Efficient Overmentioning

confidence: 99%

Constructing Earth‐abundant 3D Nanoarrays for Efficient Overall Water Splitting – A Review

2019

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Constructing nanoarrays is a promising way to achieve efficient overall water-splitting for H 2 production. At first, this paper introduces the significance of constructing nanoarrays for gas evolution reactions: Constructing electrocatalyst with nanoarray structure can provide superaerophobic surface, which can lower the bubble adhesive force and bubble size by forming a discontinuous triple phase contact line (TPCL), and that can facilitate the release of gas, while it can afford abundant active sites, and that can enhance the activity and stability for gas evolution reactions. Then, we review the activity (including � 1.49 V), and stability (including � 100 h) for overall water splitting in alkaline medium of various kinds of recently reported earth-abundant 3D nanoarray bifunctional electrocatalysts. Later, we review the efficient strategies such as constructing nanoarrays with doping metals/heteroatoms, bimetallic/multi-metallic materials, metal oxides, metal phosphide/phosphate, metal nitrides, carbon, amorphous materials, metal chalcogenides (metal sulfides and selenides), coreshell/hetero/hollow structure, vacancies/defects, and wellmatched electrode pair to achieve efficient overall water splitting. Then, we review the construction of earth-abundant nanoarray bifunctional electrocatalyst for efficient overall water splitting in acid medium. Finally, we discussed the gas separation in water electrolysis.[a] Dr.

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FeCo₂S₄ Nanosheet Arrays Supported on Ni Foam: An Efficient and Durable Bifunctional Electrocatalyst for Overall Water-Splitting

Cited by 91 publications

References 59 publications

Carbonized Wood Decorated with Cobalt‐Nickel Binary Nanoparticles as a Low‐Cost and Efficient Electrode for Water Splitting

Carbonized Wood Decorated with Cobalt‐Nickel Binary Nanoparticles as a Low‐Cost and Efficient Electrode for Water Splitting

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

Constructing Earth‐abundant 3D Nanoarrays for Efficient Overall Water Splitting – A Review

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FeCo2S4 Nanosheet Arrays Supported on Ni Foam: An Efficient and Durable Bifunctional Electrocatalyst for Overall Water-Splitting

Cited by 91 publications

References 59 publications

Carbonized Wood Decorated with Cobalt‐Nickel Binary Nanoparticles as a Low‐Cost and Efficient Electrode for Water Splitting

Carbonized Wood Decorated with Cobalt‐Nickel Binary Nanoparticles as a Low‐Cost and Efficient Electrode for Water Splitting

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

Constructing Earth‐abundant 3D Nanoarrays for Efficient Overall Water Splitting – A Review

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FeCo₂S₄ Nanosheet Arrays Supported on Ni Foam: An Efficient and Durable Bifunctional Electrocatalyst for Overall Water-Splitting