Stabilization of ruthenium nanoparticles over NiV-LDH surface for enhanced electrochemical water splitting: an oxygen vacancy approach

Karmakar, Arun; Karthick, Kannimuthu; Sankar, Selvasundarasekar Sam; Kumaravel, Sangeetha; Madhu, Ragunath; Bera, Krishnendu; Dhandapani, Hariharan N; Nagappan, Sreenivasan; Murugan, P.; Kundu, Subrata

doi:10.1039/d1ta09627c

Cited by 77 publications

(55 citation statements)

References 65 publications

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“…In addition, to many systems, − OER in the presence of Pd or Pt foils and [FeO 4 ] 2– were investigated under alkaline conditions (pH ≈ 13). , Comparing Pd, Ti, Ni, Pt, and Cu in the absence of the Fe salt points to a clear difference in the OERs. The difference in OERs for these metals is predictable since the conductivity and other properties of these metals are different (Figure a).…”

Section: Resultsmentioning

confidence: 99%

Catalysis of the Water Oxidation Reaction in the Presence of Iron and a Copper Foil

Akbari

Najafpour

2022

Inorg. Chem.

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The oxygen evolution reaction (OER) can provide electrons for reducing water, carbon dioxide, and ammonia. On the other hand, copper compounds are among the most interesting OER catalysts. In this study, water oxidation of a Cu foil in the presence of K2FeO4, a soluble Fe source, under alkaline conditions (pH ≈ 13) is investigated using electrochemical methods, X-ray diffraction, X-ray photoelectron spectroscopy, in situ visible spectroelectrochemistry, Raman spectroscopy, and scanning electron microscopy. After the reaction of the Fe salt with the Cu foil, a remarkable improvement for OER is recorded, which indicates that either the Fe ions on the copper foil directly participate in OER or these ions are critical for activating copper ions on the surface toward OER. Indeed, a remarkable decrease (130 mV) in the overpotential is recorded for the Cu foil in the presence of [FeO4]2–. Tafel slopes for the Cu foil in the absence and presence of K2FeO4 are 113.2 and 46.4 mV/decade, respectively. X-ray photoelectron spectroscopy shows that there is a strong interaction between Cu(II) and Fe(III) on the surface of the Cu foil. During OER in the presence of Cu(II) (hydr)oxide, Cu(III) is detected. In situ visible spectroelectrochemistry shows that Cu and Fe ions are dynamically active and precipitate on the surface of the counter electrode during cyclic voltammetry (CV). The isotopic experimental data using H2 18O based on Raman spectroscopy show that there is no change in the lattice oxygen. All of these experiments adopt a new perspective on the role of Fe in OER in the presence of a Cu foil under alkaline conditions.

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Section: Resultsmentioning

confidence: 99%

Catalysis of the Water Oxidation Reaction in the Presence of Iron and a Copper Foil

Akbari

Najafpour

2022

Inorg. Chem.

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“…It is suggested that the Ni coordination compound species form aggregations of molecular species before the decomposition and then decompose to Ni (hydr)oxide. Different methods have been reported for synthesizing OER catalysts, − and the decomposition of metal coordination compounds is also a promising method for this purpose.…”

Section: Results and Discussionmentioning

confidence: 99%

Water Oxidation in the Presence of a Nickel Coordination Compound: Decomposition Products, Fe Impurity in the Electrolyte, and a Candidate as a Catalyst

et al. 2022

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Sustainable energy sources require a large-scale storage system. Water electrolysis toward hydrogen formation is a remarkable method for energy storage. However, oxygen-evolution reaction (OER) through water-oxidation reaction is a bottleneck in water-splitting systems. Different Ni-based molecular structures have been claimed to be OER catalysts. However, the impact of Ni (hydr)oxides formed by the degradation of Ni-based molecular structures on OER is a challenging issue. The effect of electrolyte impurity on OER in the presence of metal coordination compounds is rarely investigated. In this study, five important questions are considered regarding OER in the presence of a Ni coordination compound: (i) In which potential does the coordination compound start to be decomposed? (ii) After how many CVs does the decomposition occur? (iii) What is the effect of Fe impurity on OER in the presence of the Ni coordination compound? (iv) What is the product of the decomposition of the Ni coordination compound? (v) What is the true catalyst for OER in the presence of the Ni coordination compound? The roles of both the Fe impurity in the electrolyte and the Ni (hydr)oxide formed in the presence of a Ni coordination compound are investigated. The experiments showed that in the presence of the Ni coordination compound, Ni (hydr)oxide and Fe impurity in KOH formed a Ni–Fe oxide-based catalyst during OER, which is an efficient catalyst for OER. Fe impurity is a key contributor to observing OER in the presence of this Ni coordination compound.

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“…26,27 Notably, the cost of Ru 0 with Pt-like HER activity is only 4% that of Pt and it is considered to be one of the most promising precious metal catalysts. [28][29][30] However, the adsorption capacity of Ru 0 for H* is very strong, which is not conducive for the Tafel step of the HER. 31 Therefore, it is crucial to use interfacial engineering strategies to readjust the electron density around Ru and optimize the adsorption of reaction intermediates.…”

Section: Introductionmentioning

confidence: 99%

Construction of Ru/FeCoP heterointerface to drive dual active site mechanism for efficient overall water splitting

Wang

et al. 2022

J. Mater. Chem. A

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Stabilization of ruthenium nanoparticles over NiV-LDH surface for enhanced electrochemical water splitting: an oxygen vacancy approach

Abstract: In a search of alternates for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER), out of various transition metal based electrocatalysts, layer double hydroxide (LDHs) based materials are attracted...

Cited by 77 publications

References 65 publications

Catalysis of the Water Oxidation Reaction in the Presence of Iron and a Copper Foil

Catalysis of the Water Oxidation Reaction in the Presence of Iron and a Copper Foil

Water Oxidation in the Presence of a Nickel Coordination Compound: Decomposition Products, Fe Impurity in the Electrolyte, and a Candidate as a Catalyst

Construction of Ru/FeCoP heterointerface to drive dual active site mechanism for efficient overall water splitting

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