Alloy-strain-output induced lattice dislocation in Ni<sub>3</sub>FeN/Ni<sub>3</sub>Fe ultrathin nanosheets for highly efficient overall water splitting

Li, Zijian; Jang, Haeseong; Qin, Danni; Jiang, Xiaoli; Ji, Xuqiang; Kim, Min; Zhang, Lijie; Li, Haiping; Cho, Jaephil

doi:10.1039/d0ta11618a

Cited by 63 publications

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“…Besides, the NiWO 4 precursors also showed a large overpotential value (265 mV), implying the vital role of the W–Ni electronic interactions in the synergistic effect of the enhanced alkaline HER activity. Encouragingly, the WNi 4 @W–WO 2 sample exhibited a markedly high alkaline HER activity with a low overpotential at 10 mA/cm 2 (η 10 = 83 mV), which is much more superior than those of previously reported alloy catalysts, − and even being competitive to the commercial Pt/C catalyst (η 10 = 48 mV) (Figure a,c). Besides, in order to eliminate the influence of the substrate, the polarization curves of WNi 4 @W–WO 2 powder loading onto glassy carbon electrode (GCE) and carbon film were also collected in 1 M KOH electrolyte, respectively (electrode fabrication seen in experiment details).…”

Section: Resultsmentioning

confidence: 70%

Tungsten–Nickel Alloy Boosts Alkaline Hydrogen Evolution Reaction

et al. 2021

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The alkaline electrocatalytic hydrogen evolution can produce clean and high-purity hydrogen gas that meets sustainable demands. Metal oxides supported transition metal alloys (e.g., WNi 4 @WO x , MoNi 4 @MoO x ) can work in synergy to alter the sluggish kinetics of alkaline HER electrocatalysis. However, to date the formation mechanism of the metal alloys extracted from nickel tungstate/molybdate precursors is unclear. Moreover, the synergistic effects of W/Mo and Ni atoms were solely based on the density functional theory calculations, and no sufficient practical evidence can support the results of the simulations. Here, we demonstrate the formation mechanism of WNi 4 @W−WO 2 using in situ variable temperature near ambient pressure X-ray photoelectron spectroscopy (NAP-XPS) measurements. The as-obtained WNi 4 @W−WO 2 heterostructures exhibited markedly high alkaline HER performance with a low overpotential (83 mV) at 10 mA/cm 2 and a small Tafel slope (83 mV/dec). The quasi in situ alkaline HER electrocatalysis determined that the enhanced mechanism of alkaline HER activity can be attributed to the synergistic effects of the neighboring W and Ni atoms. This work paves a feasible route for designing desired transition metal alloy catalysts toward highly efficient alkaline HER electrocatalysis and the elucidation of the catalytic mechanism.

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Section: Resultsmentioning

confidence: 70%

Tungsten–Nickel Alloy Boosts Alkaline Hydrogen Evolution Reaction

et al. 2021

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“…Figure 4b illustrates the ENWs-FeNi-C 2 O 4 ‖ Pt mesh electrode possesses a smaller cell voltage of 1.571 V at a current density of 10 mA cm −2 , significantly superior to that of the OC-FeNi-C 2 O 4 ‖ Pt mesh catalyst in 1.0 m KOH. Compared with the reported electrolyzers for overall water splitting (Figure 4c), the cell voltage of the ENWs-FeNi-C 2 O 4 electrode presents the lowest value among those catalysts of NiFe-Se/C (1.68 V), [36] NiFe-LDH (1.63 V), [37] NiFe@C (1.575 V), [38] NiFeOF (1.83 V), [39] and d-Ni 3 FeN/Ni 3 Fe (1.63 V), [40] indicating that the ENWs-FeNi-C 2 O 4 reveal a potential application for overall water splitting. Notably, the obtained electrode also displays a good catalytic stability for overall water splitting (Figure 4d), and the electrolytic voltage can maintain steady over 12 h at a voltage of 1.6 V (vs RHE).…”

Section: Catalytic Performance For Overall Water Splittingmentioning

confidence: 98%

Novel FeNi‐Based Nanowires Network Catalyst Involving Hydrophilic Channel for Oxygen Evolution Reaction

Qiao

Kang

et al. 2022

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Developing novel, efficient, and low‐cost 3D FeNi‐based oxygen evolution reaction (OER) catalysts with the special hydrophilic channel is still a challenge for improving hydrogen production efficiency. Herein, a novel 3D ethoxy substituted FeNi oxalate (ENWs‐FeNi‐C2O4) nanowires network catalyst with hydrophilic channels is reported firstly, which shows an outstanding OER activity with a low overpotential (215 mV at 10 mA cm−2) and small Tafel slope (54.5 mV dec−1). OER catalytic mechanism indicates that the OH adsorption step and O2 bubble diffusion step of OER reaction process can be significantly improved due to the special hydrophilic channels, and the ethoxy as an interlayer ligand not only expands the interlayer distance of layered FeNi (oxy) hydroxide true active species but modulates its electronic structure, promoting the *OOH formation step, and thus exhibiting the outstanding OER performance. This work provides a novel idea for the preparation of novel and efficient OER electro‐catalysts with special 3D structures.

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“…Nevertheless, low activity under pH‐universal conditions and poor stability in acidic media remain significant problems with these catalysts. The defect engineering of nanomaterials, for example, the doping of alien atoms [9] and creation of vacancy defects, [10] is a common technique for improving the catalytic performance of materials. Doping alien atoms can alter the position of the d ‐band center relative to the Fermi level, thus optimizing the adsorption energy of the intermediates and modulating the intrinsic activity [11] .…”

Section: Introductionmentioning

confidence: 99%

Sodium‐Decorated Amorphous/Crystalline RuO₂ with Rich Oxygen Vacancies: A Robust pH‐Universal Oxygen Evolution Electrocatalyst

et al. 2021

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The oxygen evolution reaction (OER) is a key reaction for many electrochemical devices. To date, many OER electrocatalysts function well in alkaline media, but exhibit poor performances in neutral and acidic media, especially the acidic stability. Herein, sodium‐decorated amorphous/crystalline RuO2 with rich oxygen vacancies (a/c‐RuO2) was developed as a pH‐universal OER electrocatalyst. The a/c‐RuO2 shows remarkable resistance to acid corrosion and oxidation during OER, which leads to an extremely high catalytic stability, as confirmed by a negligible overpotential increase after continuously catalyzing OER for 60 h at pH=1. Besides, a/c‐RuO2 also exhibits superior OER activities to commercial RuO2 and most reported OER catalysts under all pH conditions. Theoretical calculations indicated that the introduction of Na dopant and oxygen vacancy in RuO2 weakens the adsorption strength of the OER intermediates by engineering the d‐band center, thereby lowering the energy barrier for OER.

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Alloy-strain-output induced lattice dislocation in Ni₃FeN/Ni₃Fe ultrathin nanosheets for highly efficient overall water splitting

Abstract: d-Ni3FeN/Ni3Fe with rich lattice defects, combining the ultrathin 2D morphology and the interface between Ni3FeN and Ni3Fe, endows the electrocatalyst with excellent performance for both the OER and HER in alkaline media.

Cited by 63 publications

References 64 publications

Tungsten–Nickel Alloy Boosts Alkaline Hydrogen Evolution Reaction

Tungsten–Nickel Alloy Boosts Alkaline Hydrogen Evolution Reaction

Novel FeNi‐Based Nanowires Network Catalyst Involving Hydrophilic Channel for Oxygen Evolution Reaction

Sodium‐Decorated Amorphous/Crystalline RuO₂ with Rich Oxygen Vacancies: A Robust pH‐Universal Oxygen Evolution Electrocatalyst

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Alloy-strain-output induced lattice dislocation in Ni3FeN/Ni3Fe ultrathin nanosheets for highly efficient overall water splitting

Abstract: d-Ni3FeN/Ni3Fe with rich lattice defects, combining the ultrathin 2D morphology and the interface between Ni3FeN and Ni3Fe, endows the electrocatalyst with excellent performance for both the OER and HER in alkaline media.

Cited by 63 publications

References 64 publications

Tungsten–Nickel Alloy Boosts Alkaline Hydrogen Evolution Reaction

Tungsten–Nickel Alloy Boosts Alkaline Hydrogen Evolution Reaction

Novel FeNi‐Based Nanowires Network Catalyst Involving Hydrophilic Channel for Oxygen Evolution Reaction

Sodium‐Decorated Amorphous/Crystalline RuO2 with Rich Oxygen Vacancies: A Robust pH‐Universal Oxygen Evolution Electrocatalyst

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Alloy-strain-output induced lattice dislocation in Ni₃FeN/Ni₃Fe ultrathin nanosheets for highly efficient overall water splitting

Sodium‐Decorated Amorphous/Crystalline RuO₂ with Rich Oxygen Vacancies: A Robust pH‐Universal Oxygen Evolution Electrocatalyst