Hierarchical growth of vertically standing Fe3O4-FeSe/CoSe2 nano-array for high effective oxygen evolution reaction

Zhang, Longcheng; Wang, Minqiang; Chen, Hao; Liu, Heng; Wang, Ying; Zhang, Longzhen; Hou, Guorong; Bao, Shu‐Juan

doi:10.1016/j.materresbull.2019.110680

Cited by 19 publications

(2 citation statements)

References 40 publications

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“…3(b), the survey spectra of NiSe2/RGO demonstrate the presence of Ni, Se, and C elements. and Ni 3+ of nickel oxides on the surface of the products [35,36], whereas Ni 2+ and Ni 3+ of Ni-Se bond are observed at about 871.0 and 872.8 eV in the Ni 2p1/2 region [37,38]. Compared with Ni0.85Se/RGO (Fig.…”

Section: Resultsmentioning

confidence: 91%

Unconventional dual-vacancies in nickel diselenide-graphene nanocomposite for high-efficiency oxygen evolution catalysis

et al. 2020

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Although nickel-based catalysts display good catalytic capability and excellent corrosion resistance under alkaline electrolytes for water splitting, it is still imperative to enhance their activity for real device applications. Herein, we decorated Ni 0.85 Se hollow nanospheres onto reduced graphene oxide (RGO) through a hydrothermal route, then annealed this composite at different temperatures (400 °C, NiSe 2-400 and 450 °C, NiSe 2-450) under argon atmosphere, yielding a kind of NiSe 2 /RGO composite catalysts. Positron annihilation spectra revealed two types of vacancies formed in this composite catalyst. We found that the NiSe 2-400 catalyst with dual Ni-Se vacancies is able to catalyze the oxygen evolution reaction (OER) efficiently, needing a mere 241 mV overpotential at 10 mA•cm −2. In addition, this catalyst exhibits outstanding stability. Computational studies show favorable energy barrier on NiSe 2-400, enabling moderate OH − adsorption and O 2 desorption, which leads to the enhanced energetics for OER.

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Section: Resultsmentioning

confidence: 91%

Unconventional dual-vacancies in nickel diselenide-graphene nanocomposite for high-efficiency oxygen evolution catalysis

et al. 2020

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“…This should open the way to cross-validation between theory and experiment, which should lead to a deeper understanding and then, eventually, to the rational design of much-needed more efficient and sustainable optimized catalysts in both oxidation and OER catalysis. In perspective, it will also be very interesting to further extend our approach by including defects such as oxygen vacancies in the surface energetics [53] or more complex composite architectures [54,55].…”

Section: Discussionmentioning

confidence: 99%

Atomistic Modeling of Spinel Oxide Particle Shapes and Reshaping under OER Conditions

Avcı,

Sementa,

Fortunelli

2024

Physchem

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The surface configurations of the low-index facets of a set of spinel oxides are investigated using DFT+U calculations to derive surface energies and predict equilibrium nanoparticle shapes via the Wulff construction. Two very different conditions are investigated, corresponding to application either in heterogeneous catalysis or in electrocatalysis. First, the bare stoichiometric surfaces of NiFe2O4, CoFe2O4, NiCo2O4, and ZnCo2O4 spinels are studied to model their use as high-temperature oxidation catalysts. Second, focusing attention on the electrochemical oxygen evolution reaction (OER) and on the CoFe2O4 inverse spinel as the most promising OER catalyst, we generate surface configurations by adsorbing OER intermediates and, in an innovative study, we recalculate surface energies taking into account adsorption and environmental conditions, i.e., applied electrode potential and O2 pressure. We predict that under OER operating conditions, (111) facets are dominant in CoFe2O4 nanoparticle shapes, in fair agreement with microscopy measurements. Importantly, in the OER case, we predict a strong dependence of nanoparticle shape upon O2 pressure. Increasing O2 pressure increases the size of the higher-index (111) and (110) facets at the expense of the (001) more catalytically active facet, whereas the opposite occurs at low O2 pressure. These predictions should be experimentally verifiable and help define the optimal OER operative conditions.

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Cost‐effective and Efficient Catalyst of Bimetallic Nickel Iron Selenide toward Oxygen Evolution Reaction

et al. 2020

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The incorporation of additional metal to form homo/heterojunction nanomaterials may enhance electrical conductivity and electrocatalytic performance. In this work, a novel Ni−Fe‐Se compound made through a facile solvothermal method with the presence of D‐(+)‐glucose (labeled as Ni0.5Fe0.5Se2/C) exhibited outstanding catalytic activity toward water oxidation. During oxygen evolution reaction (OER) process in alkaline condition, Ni0.5Fe0.5Se2/C catalyst shows an overpotential of 254 mV at 10 mA cm−2, 77 mV lower than that of the commercial RuO2, and an excellent stability.

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Hierarchical growth of vertically standing Fe3O4-FeSe/CoSe2 nano-array for high effective oxygen evolution reaction

Cited by 19 publications

References 40 publications

Unconventional dual-vacancies in nickel diselenide-graphene nanocomposite for high-efficiency oxygen evolution catalysis

Unconventional dual-vacancies in nickel diselenide-graphene nanocomposite for high-efficiency oxygen evolution catalysis

Atomistic Modeling of Spinel Oxide Particle Shapes and Reshaping under OER Conditions

Cost‐effective and Efficient Catalyst of Bimetallic Nickel Iron Selenide toward Oxygen Evolution Reaction

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