Tailorable nanoarchitecturing of bimetallic nickel–cobalt hydrogen phosphate <i>via</i> the self-weaving of nanotubes for efficient oxygen evolution

Septiani, Ni Luh Wulan; Kaneti, Yusuf Valentino; Fathoni, Kresna Bondan; Guo, Yanna; Ide, Yusuke; Yuliarto, Brian; Jiang, Xuchuan; Nugraha, Nugraha; Dipojono, Hermawan Kresno; Golberg, Dmitri; Yamauchi, Yusuke

doi:10.1039/c9ta13442e

Cited by 136 publications

(100 citation statements)

References 67 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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“…Recently, transition metal (TM) oxides and hydroxides, particularly cobalt‐based compounds, have emerged as promising alternatives due to their earth abundance and considerable OER activities. [ 11–17 ] It has been generally accepted that a high catalytic activity can be achieved only if absorbed species bind to the catalyst surface with moderate strength. [ 18 ] Thus, further enhancing the OER activity of TM oxides and hydroxides strictly depends on optimizing their electronic structure.…”

Section: Introductionmentioning

confidence: 99%

Ultrathin Metal Silicate Hydroxide Nanosheets with Moderate Metal–Oxygen Covalency Enables Efficient Oxygen Evolution

Zhu

Zhuang

et al. 2021

Energy & Environ Materials

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Exploring efficient, cost‐effective, and durable electrocatalysts for electrochemical oxygen evolution reaction (OER) is pivotal for the large‐scale application of water electrolysis. Recent advance has demonstrated that the activity of electrocatalysts exhibits a strong dependence on the surface electronic structure. Herein, a series of ultrathin metal silicate hydroxide nanosheets (UMSHNs) M3Si2O5(OH)4 (M = Fe, Co, and Ni) synthesized without surfactant are introduced as highly active OER electrocatalysts. Cobalt silicate hydroxide nanosheets show an optimal OER activity with overpotentials of 287 and 358 mV at 1 and 10 mA cm−2, respectively. Combining experimental and theoretical studies, it is found that the OER activity of UMSHNs is dominated by the metal–oxygen covalency (MOC). High OER activity can be achieved by having a moderate MOC as reflected by a σ*‐orbital (eg) filling near unity and moderate [3d]/[2p] ratio. Moreover, the UMSHNs exhibit favorable chemical stability under oxidation potential. This contribution provides a scientific guidance for further development of active metal silicate hydroxide catalysts.

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“…Over the past decades, plenty of attempts have been made to design and develop catalysts that alloys, − carbides, , nitrides, , oxides, − phosphides, − borides, , and chalcogenides , are some of the materials that have been widely explored. Amidst a wide spectrum of electrocatalytic chemicals, the well-known metal compounds of Fe, Co, and Nilocated in the same group with Ru, Ir, and Pt, individually and hence expected to show relatively identical catalytic traitsand different compositions of their mixed oxides are believed to have outstanding catalytic activity for electrolysis of water. , It is generally presumed that multinary mixed oxides should outperform their unary counterparts by the virtue of their intrinsic merits such as desirable electrical and catalytic abilities. − Keeping this in mind, to accurately evaluate the performance of these oxides, their compositions and particularly content of metal ions should be taken into consideration …”

Section: Introductionmentioning

confidence: 99%

Microwave-Assisted Auto-Combustion Synthesis of Binary/Ternary Co_xNi_1−xFerrite for Electrochemical Hydrogen and Oxygen Evolution

et al. 2021

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Enormous efforts have been dedicated to engineering low-cost and efficient electrocatalysts for both hydrogen evolution and oxygen evolution reactions (HER and OER, respectively). For this, the current contribution reports the successful synthesis of binary/ternary metal ferrites (Co x Ni 1−x Ferrite; x = 0.0, 0.1, 0.3, 0.5, 0.7, and 1.0) by a simple one-step microwave technique and subsequently discusses its chemical and electrochemical properties. The X-ray diffraction analysis substantiated the phase purity of the as-obtained catalysts with various compositions. Additionally, the morphology of the nanoparticles was identified via transmission electron microscopy. Further, the vibrating sample magnetometer justified the ferromagnetic character of the as-prepared products. The electrochemical measurements revealed that the as-prepared materials required the overpotentials of 422−600 and 419−467 mV for HER and OER, respectively, to afford current densities of 10 mA cm −2 . In the general sense, Ni cation substitution with Co influenced favorably toward both HER and OER. Among all synthesized electrocatalysts, Co 0.9 Ni 0.1 Ferrite displayed the highest performance in terms of OER in 1 M KOH solution, which is related to the synergistic effect of multiple parameters including the optimal substitution amount of Co, the highest Brunauer−Emmett−Teller surface area, the smallest particle size among all samples (26.71 nm), and the lowest charge transfer resistance. The successful synthesis of ternary ferrites carried out for the first time via a microwave-assisted auto-combustion route opens up a new path for their applications in renewable energy technologies.

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Tailorable nanoarchitecturing of bimetallic nickel–cobalt hydrogen phosphate via the self-weaving of nanotubes for efficient oxygen evolution

Abstract: This work reports the fabrication of bimetallic nickel–cobalt hydrogen phosphate with unique nanotube-assembled 1D and 2D architectures for electrocatalytic OER.

Cited by 136 publications

References 67 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

Ultrathin Metal Silicate Hydroxide Nanosheets with Moderate Metal–Oxygen Covalency Enables Efficient Oxygen Evolution

Microwave-Assisted Auto-Combustion Synthesis of Binary/Ternary Co_xNi_1−xFerrite for Electrochemical Hydrogen and Oxygen Evolution

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Tailorable nanoarchitecturing of bimetallic nickel–cobalt hydrogen phosphate via the self-weaving of nanotubes for efficient oxygen evolution

Abstract: This work reports the fabrication of bimetallic nickel–cobalt hydrogen phosphate with unique nanotube-assembled 1D and 2D architectures for electrocatalytic OER.

Cited by 136 publications

References 67 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

Ultrathin Metal Silicate Hydroxide Nanosheets with Moderate Metal–Oxygen Covalency Enables Efficient Oxygen Evolution

Microwave-Assisted Auto-Combustion Synthesis of Binary/Ternary CoxNi1−xFerrite for Electrochemical Hydrogen and Oxygen Evolution

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Microwave-Assisted Auto-Combustion Synthesis of Binary/Ternary Co_xNi_1−xFerrite for Electrochemical Hydrogen and Oxygen Evolution