Extraction of nickel from NiFe-LDH into Ni<sub>2</sub>P@NiFe hydroxide as a bifunctional electrocatalyst for efficient overall water splitting

Zhang, Fang-Shuai; Wang, Jia‐Wei; Luo, Jun; Liu, Rui‐Rui; Zhang, Zhiming; He, Chun‐Ting; Lu, Tong‐Bu

doi:10.1039/c7sc04569g

Cited by 261 publications

(108 citation statements)

References 77 publications

(28 reference statements)

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“…[5][6][7] Extensive researches are being carried out to develop non-noble metal based electrocatalysts which can replace those precious electrocatalysts. [7][8][9][10][11] In addition, an electrocatalyst which can catalyze both HER and OER in the same medium is highly desirable in the context of overall efficiency of the electrolysis process. [1,[8][9][10][11] In comparison to other transition metals, iron shows greater commitment due to its high natural abundance and lesser toxicity.…”

Section: Introductionmentioning

confidence: 99%

“…[7][8][9][10][11] In addition, an electrocatalyst which can catalyze both HER and OER in the same medium is highly desirable in the context of overall efficiency of the electrolysis process. [1,[8][9][10][11] In comparison to other transition metals, iron shows greater commitment due to its high natural abundance and lesser toxicity. [12][13] In addition, Fe-based metalloenzymes are found to be present in microorganisms which can effectively convert a proton into hydrogen.…”

Section: Introductionmentioning

confidence: 99%

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Effect of the Solvent Ratio (Ethylene Glycol/Water) on the Preparation of an Iron Sulfide Electrocatalyst and Its Activity towards Overall Water Splitting

et al. 2019

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The polyol method is an efficient procedure for metal sulfide preparation where polyol not only acts as a solvent but also as reducing and morphology‐modulating agent. Herein, iron sulfide particles were prepared via a modified polyol method by changing the ethylene glycol (EG) : water (H2O) ratio in the mixed solvent. Analytical techniques and electronic microscopy studies confirmed that the change in EG : H2O ratio modulated the crystal structure, morphology, and electronic structure of the prepared iron sulfide particles. The electrocatalytic activity of iron sulfide changed owing to these modulations. EG helped in the formation of a sheet‐like structure – a morphology that favours a higher accessibility to the catalytically active sites. As evidenced form electrochemical impedance studies, an increased electron density near the Fermi level, a faster substrate adsorption‐desorption rate at the active sites, and a faster charge transfer at the electrode‐electrolyte interface were the key factors for the amplification in catalytic activity. The prepared iron sulfide particles showed an overall water splitting efficiency that is comparable to that of the state‐of‐the‐art RuO2‐Pt/C couple in alkaline medium. This study shows the potential of the polyol method in the preparation and catalytic‐activity modulation of Fe−S‐based electrocatalysts.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of the Solvent Ratio (Ethylene Glycol/Water) on the Preparation of an Iron Sulfide Electrocatalyst and Its Activity towards Overall Water Splitting

et al. 2019

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“…Moreover,t he decrease of surface metalÀFbonds is observed, which is probably due to (Figure 5d). [16] The authors found that NiFe hydroxide formed on the surfaceo fP -NiFe during the OER was the real catalystf or OER, and the newly formed metal oxy/hydroxide layer could prevent furtherc orrosion of the inner Ni 2 Pi nt he catalysts ystem. Similar cases have been found with other transition-metal-based catalysts such as phosphides, nitrides, sulfides,a nd boridesa sO ER catalysts.…”

Section: Resultsmentioning

confidence: 99%

Fluoridated Iron–Nickel Layered Double Hydroxide for Enhanced Performance in the Oxygen Evolution Reaction

Pei

Zong

et al. 2019

ChemSusChem

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Layered double hydroxides (LDHs) are very promising but still far from satisfactory for catalyzing the electrochemical oxygen evolution reaction (OER) in water electrolysis. Herein, it was found that the catalytic performance of iron–nickel LDHs for OER can be largely boosted by a facile and controllable fluoridation approach at low temperatures. Temperature dependence of the crystal structure and surface chemical state was observed for the simple fluoridation of the iron–nickel LDH. However, no significant surface roughness and electrochemical active surface area increases were found, which was probably owing to the structure change from nanosheets to nanorods. Significant improvements in the performance, including the catalytic activity, stability, efficiency, and kinetics, were found compared with the pristine iron–nickel LDH. Specifically, iron–nickel fluoride obtained at 250 °C afforded the lowest overpotential of 225 mV (no iR correction) to drive 10 mA cm−2 loaded on an inert glassy carbon electrode with a small Tafel slope of 79 mV dec−1, outperforming the noble‐metal IrO2 catalyst and most of the similar Fe–Ni based catalysts. The performance improvement could be mainly attributed to the phase‐structure transfer from metal−O bonding in the FeNi‐LDHs to metal−F bonding after fluoridation, which means it is easier to form the real active sites of Fe‐doped high‐valence Ni‐(oxy)hydroxide over the iron–nickel fluoride surface.

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“…For example, Lu et al. fabricated a Ni 2 P@FePO x heterostructure for highly efficient overall water splitting . Zhou et al.…”

Section: Methodsmentioning

confidence: 99%

“…[9][10][11][12] For example, Lu et al fabricated aN i 2 P@FePO x heterostructure for highly efficient overall water splitting. [13] Zhou et al reported hierarchical bimetal-organic nanostructures for OER catalysis with outstanding performance. [14] Metal-organic frameworks (MOFs) are materials in which metal centerso rc lusters are linked by organic ligandsw ith periodic structuralu nits.…”

mentioning

confidence: 99%

Stable Iron Hydroxide Nanosheets@Cobalt‐Metal–Organic–Framework Heterostructure for Efficient Electrocatalytic Oxygen Evolution

Gao

Liu

et al. 2019

ChemSusChem

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Most studies are devoted to the use of metal–organic frameworks (MOFs) as templates to construct desirable electrocatalysts in situ by high‐temperature pyrolysis. The emergence of heterostructures invokes new opportunities to use the full potential of pristine MOFs as efficient catalysts in the oxygen evolution reaction (OER). Here, a MOF surface‐reaction strategy is developed to synthesize MOF‐based heterostructures without pyrolysis. Uniform Fe(OH)3 nanosheets are grown controllably on the Co‐MOF‐74 surface by a fast “phenol–Fe” reaction that takes advantage of the hydroxyl sites in Co‐MOF‐74. The resulting Fe(OH)3@Co‐MOF‐74 heterostructure delivers an excellent performance in the OER with a low overpotential of 292 mV at 10 mA cm−2. Notably, the introduction of Fe can improve the intrinsic activity of the original Co atom significantly. The turnover frequency in Fe(OH)3@Co‐MOF‐74 (1.209 s−1) is more than 25 times higher than that in Co‐MOF‐74 (0.048 s−1). This work presents a fresh concept for the fundamental design of advanced pure‐MOF‐based heterostructures and, thereby, provides a new avenue for the fabrication of other energy‐conversion and ‐storage materials.

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Extraction of nickel from NiFe-LDH into Ni₂P@NiFe hydroxide as a bifunctional electrocatalyst for efficient overall water splitting

Abstract: Ni2P@FePOx has been synthesized via extraction and selective phosphorization of nickel in NiFe-LDH, and then conversed to a new heterostructure of Ni2P@NiFe hydroxide (P-NiFe) during water splitting. P-NiFe can act as an efficient bifunctional electrocatalyst for overall water splitting.

Cited by 261 publications

References 77 publications

Effect of the Solvent Ratio (Ethylene Glycol/Water) on the Preparation of an Iron Sulfide Electrocatalyst and Its Activity towards Overall Water Splitting

Effect of the Solvent Ratio (Ethylene Glycol/Water) on the Preparation of an Iron Sulfide Electrocatalyst and Its Activity towards Overall Water Splitting

Fluoridated Iron–Nickel Layered Double Hydroxide for Enhanced Performance in the Oxygen Evolution Reaction

Stable Iron Hydroxide Nanosheets@Cobalt‐Metal–Organic–Framework Heterostructure for Efficient Electrocatalytic Oxygen Evolution

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Extraction of nickel from NiFe-LDH into Ni2P@NiFe hydroxide as a bifunctional electrocatalyst for efficient overall water splitting

Abstract: Ni2P@FePOx has been synthesized via extraction and selective phosphorization of nickel in NiFe-LDH, and then conversed to a new heterostructure of Ni2P@NiFe hydroxide (P-NiFe) during water splitting. P-NiFe can act as an efficient bifunctional electrocatalyst for overall water splitting.

Cited by 261 publications

References 77 publications

Effect of the Solvent Ratio (Ethylene Glycol/Water) on the Preparation of an Iron Sulfide Electrocatalyst and Its Activity towards Overall Water Splitting

Effect of the Solvent Ratio (Ethylene Glycol/Water) on the Preparation of an Iron Sulfide Electrocatalyst and Its Activity towards Overall Water Splitting

Fluoridated Iron–Nickel Layered Double Hydroxide for Enhanced Performance in the Oxygen Evolution Reaction

Stable Iron Hydroxide Nanosheets@Cobalt‐Metal–Organic–Framework Heterostructure for Efficient Electrocatalytic Oxygen Evolution

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Extraction of nickel from NiFe-LDH into Ni₂P@NiFe hydroxide as a bifunctional electrocatalyst for efficient overall water splitting