Transforming NiFe layered double hydroxide into NiFeP<sub><i>x</i></sub> for efficient alkaline water splitting

Zhao, Jia; Liao, Nan; Luo, Jingshan

doi:10.1039/d3ta01192e

Cited by 34 publications

(19 citation statements)

References 47 publications

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“…The above results suggest that the HER kinetics for Mo 2 C–W 2 C/RGO-0.56, Mo 2 C/RGO and W 2 C/RGO should follow the Volmer–Heyrovsky mechanism and Mo 2 C–W 2 C/RGO-0.56 suggests a more rapid HER kinetics. 54,55 Extrapolating the above Tafel plots, the higher value of the calculated exchange current density ( j 0 ) also indicates the high HER activity of Mo 2 C–W 2 C/RGO-0.56 (Table S4†).…”

Section: Resultsmentioning

confidence: 91%

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Boosting electrocatalytic hydrogen evolution over a Mo₂C–W₂C heterostructure by interface-induced electron modulation

Jiang,

Wang,

Zhou

et al. 2024

J. Mater. Chem. A

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Section: Resultsmentioning

confidence: 91%

“…Besides, the Tafel slope of Mo 2 C–W 2 C/RGO-0.56 within the theoretical value indicates that the reaction kinetics for hydrogen generation is the Volmer–Heyrovsky mechanism. 54,55 Furthermore, capacitance values (Fig. S9 and Table S5†), Nyquist diagram (Fig.…”

Section: Resultsmentioning

confidence: 99%

Boosting electrocatalytic hydrogen evolution over a Mo₂C–W₂C heterostructure by interface-induced electron modulation

Jiang,

Wang,

Zhou

et al. 2024

J. Mater. Chem. A

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“…16 Fortunately, LDHs could be used as a precursor for the synthesis of transition metal phosphides (TMPs). 17 TMPs has a unique structure, high proton adsorption capacity, and durability, 18 which is expected to replace Ru-based OER catalysts. FeNi bimetallic phosphide has a better electronic structure, which significantly improves the electrocatalytic activity.…”

Section: Introductionmentioning

confidence: 99%

“…Fortunately, LDHs could be used as a precursor for the synthesis of transition metal phosphides (TMPs) . TMPs has a unique structure, high proton adsorption capacity, and durability, which is expected to replace Ru-based OER catalysts.…”

Section: Introductionmentioning

confidence: 99%

Fe-Based Metal Organic Framework-Derived FeNiP/N-Doped Carbon Heterogeneous Core–Shell Structures for Oxygen Evolution

Cao,

Yan,

Wen

et al. 2024

Inorg. Chem.

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It is of great significance to explore high activity, low overpotential, and outstanding durability electrocatalysts without precious metals for oxygen evolution reaction to reduce the energy consumption in the electrolysis of water to product hydrogen. Metal organic frameworks (MOFs) with periodic structure and uniform pore distribution have been widely used as precursors for the synthesis of transition metal electrocatalysts. Herein, we first synthesized nanoscale Fe-soc-MOFs with relatively high specific surface area and in situ converted it into nickel–iron double layer hydroxide/MOF (FeNi LDH/MOF) by Ni2+ etching. Finally, a nickel–iron phosphide/nitrogen-doped carbon cubic nanocage (FeNiP/NC) was obtained by calcination and phosphating. FeNiP/NC with its unique core–shell structure has an overpotential of only 240 mV at a current density of 10 mA/cm2 and can be continuously electrolyzed for 45 h. High catalytic activity of FeNiP/NC is mainly attributed to the action of Fe and Ni bimetals and the synergistic effect between FeNiP and N-doped porous carbon, which was confirmed by the calculation of density functional theory (i.e., Gibbs free energy). After a long period of electrolysis, FeNiP was converted to MOOH (M = Fe and Ni) and became the new active site. This study provides a feasible optimization strategy for the development of high-efficiency three-dimensional electrode materials without precious metals.

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“…However, again, they should be replaced because of their scarcity in the Earth’s crust . Thus, efforts have been focused on developing 3d transition-metal-based catalysts, such as Mn-, Fe-, Co-, Ni-, and Cu-based OER catalysts. − Many 3d transition-metal-based catalysts are only operable under alkaline conditions as a result of their poor stability in acidic conditions. Among 3d transition-metal-based catalysts, FeNi (hydr)oxides are earth-abundant, low-cost, efficient, and stable OER catalysts in alkaline solutions.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Changes of an Anodized FeNi Alloy during the Oxygen Evolution Reaction under Alkaline Conditions

Akbari,

Nandy,

Chae

et al. 2023

Langmuir

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An efficient and durable oxygen evolution reaction (OER) catalyst is necessary for the water-splitting process toward energy conversion. The OER through water oxidation reactions could provide electrons for H 2 O, CO 2 , and N 2 reduction and produce valuable compounds. Herein, the FeNi (1:1 Ni/Fe) alloy as foam, after anodizing at 50 V in a two-electrode system in KOH solution (1.0 M), was characterized by Raman spectroscopy, diffuse reflectance spectroscopy (DRS), X-ray absorption spectroscopy (XAS), X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectrometry (EDX), transmission electron microscopy (TEM), high-angle annular darkfield imaging (HAADF)−scanning transmission electron microscopy (STEM) and used as an efficient and durable OER electrocatalyst in KOH solution (1.0 M). The overpotential for the onset of the OER based on extrapolation of the Tafel plot was 225 mV. The overpotentials for the current densities of 10 and 30 mA/cm 2 are observed at 270 and 290 mV, respectively. In addition, a low Tafel slope is observed, 38.0 mV per decade, for the OER. To investigate the mechanism of the OER, in situ surfaceenhanced Raman spectroscopy was used to detect FeNi hydroxide and characteristic peaks of H 2 O. Impurities in KOH can adsorb onto the electrode surface during the OER. Peaks corresponding to Ni(III) (hydr)oxide and FeO 4 2− can be detected during the OER, but high-valent FeNi (hydr)oxides are unstable and reduce under the open circle potential. Metal hydroxide transformations during the OER and anion adsorption should be carefully considered. In addition, Fe 3 O 4 may convert to γ-Fe 2 O 3 during the OER. This study aims to offer logical perspectives on the dynamic changes that occur during the OER under alkaline conditions in an anodized FeNi alloy. These changes encompass variations in morphology, surface oxidation, the generation of high-valent species, and phase conversion during the OER.

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Transforming NiFe layered double hydroxide into NiFeP_x for efficient alkaline water splitting

Abstract: In situ Raman was used to monitoring the change of NiFePx during the OER process. As the potential increased, the peak for PO2− disappeared and the Ni2+–O transformed into oxyhydroxides. The results demonstrate that P species are unstable under OER conditions.

Cited by 34 publications

References 47 publications

Boosting electrocatalytic hydrogen evolution over a Mo₂C–W₂C heterostructure by interface-induced electron modulation

Boosting electrocatalytic hydrogen evolution over a Mo₂C–W₂C heterostructure by interface-induced electron modulation

Fe-Based Metal Organic Framework-Derived FeNiP/N-Doped Carbon Heterogeneous Core–Shell Structures for Oxygen Evolution

Dynamic Changes of an Anodized FeNi Alloy during the Oxygen Evolution Reaction under Alkaline Conditions

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Transforming NiFe layered double hydroxide into NiFePx for efficient alkaline water splitting

Abstract: In situ Raman was used to monitoring the change of NiFePx during the OER process. As the potential increased, the peak for PO2− disappeared and the Ni2+–O transformed into oxyhydroxides. The results demonstrate that P species are unstable under OER conditions.

Cited by 34 publications

References 47 publications

Boosting electrocatalytic hydrogen evolution over a Mo2C–W2C heterostructure by interface-induced electron modulation

Boosting electrocatalytic hydrogen evolution over a Mo2C–W2C heterostructure by interface-induced electron modulation

Fe-Based Metal Organic Framework-Derived FeNiP/N-Doped Carbon Heterogeneous Core–Shell Structures for Oxygen Evolution

Dynamic Changes of an Anodized FeNi Alloy during the Oxygen Evolution Reaction under Alkaline Conditions

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Transforming NiFe layered double hydroxide into NiFeP_x for efficient alkaline water splitting

Boosting electrocatalytic hydrogen evolution over a Mo₂C–W₂C heterostructure by interface-induced electron modulation

Boosting electrocatalytic hydrogen evolution over a Mo₂C–W₂C heterostructure by interface-induced electron modulation