Nanostructured NiCo@NiCoOx core-shell layer as efficient and robust electrocatalyst for oxygen evolution reaction

Wu, Lian-Kui; Wu, Wei-Yao; Xia, Jie; Hou, Guangya; Tang, Yiping; Zheng, Guoqu

doi:10.1016/j.electacta.2017.09.146

Cited by 39 publications

(15 citation statements)

References 63 publications

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“…16,43 Because of the very limited detection depth of XPS, the signals from elemental B and Co beneath the surface layer are hard to be detected here. 48 On the other hand, the identical forms of Co and B species (confirmed by the Co 2p and B 1s components appearing in the same binding energies) are found for the bare CoB electrode soaked in distilled water for 1 min and dried at 50°C (Fig. S15 †).…”

Section: Nanoscale Papermentioning

confidence: 57%

Nanostructured core–shell metal borides–oxides as highly efficient electrocatalysts for photoelectrochemical water oxidation

Jothi

Thersleff

et al. 2020

Nanoscale

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Section: Nanoscale Papermentioning

confidence: 57%

Nanostructured core–shell metal borides–oxides as highly efficient electrocatalysts for photoelectrochemical water oxidation

Jothi

Thersleff

et al. 2020

Nanoscale

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“…The benchmark catalysts for the OER are still noble metal catalysts, namely IrO 2 in acidic and RuO 2 in alkaline media. [18,19,24,27,[31][32][33][34][35][36][37][38] While the mechanisms of single metal catalysts are understood quiet well, the mechanism and the synergyo fb imetallic systems are less explored. Mn, [20][21][22][23][24] Fe, [24][25][26][27] Co, [6,24,[26][27][28] Ni, [24,26,27,29] and Cu [30] )a nd mixtures of such compounds.…”

Section: Introductionmentioning

confidence: 99%

“…Mn, [20][21][22][23][24] Fe, [24][25][26][27] Co, [6,24,[26][27][28] Ni, [24,26,27,29] and Cu [30] )a nd mixtures of such compounds. [18,19,24,27,[31][32][33][34][35][36][37][38] While the mechanisms of single metal catalysts are understood quiet well, the mechanism and the synergyo fb imetallic systems are less explored. Rossmeisl et al showed that four consecutive energy steps are needed to create oxygen out of water.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of a Highly Efficient Oxygen‐Evolution Electrocatalyst by Incorporation of Iron into Nanoscale Cobalt Borides

et al. 2018

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High-performance catalysts for the oxygen-evolution reaction in water electrolysis are usually based on expensive and rare elements. Herein, mixed-metal borides are shown to be competitive with established electrocatalysts like noble metal oxides and other transition-metal(oxide)-based catalysts. Iron incorporation into nanoscale dicobalt boride results in excellent activity and stability in alkaline solutions. (Co Fe ) B shows an overpotential of η=0.33 V (1.56 V vs. RHE) at 10 mA cm in 1 m KOH with a very low onset potential of ≈1.5 V vs. RHE, comparable to the performance of IrO and RuO . XPS shows that the original catalyst is modified under the reaction conditions and indicates that CoOOH and Co(OH) are formed as active surface species, whereas the Fe remains in the catalyst, contributing to an improved catalyst performance. The nanoscale borides are obtained by a one-step solution synthesis, calcined, and characterized by XRD, energy-dispersive X-ray spectroscopy, and SEM. Single crystals of (Co Fe ) B grown under chemical transport conditions were used for an unambiguous specification of the nanostructured particles by relating the cobalt/iron ratio to the lattice parameters.

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“…In most of these studies, the mixture of the transition metals enhanced the electrochemical performance in comparison to the mono‐metallic phase. These effects are not well understood so far, but they have been found amongst others in oxide/hydroxides, [26,61,64–66] phosphides, [68,69] and borides [11,13,14,45,59,67] . A summary of comparative overpotential values for other mixed‐metal‐borides can be found in the SI (see Table S3).…”

Section: Resultsmentioning

confidence: 97%

“…The synergy between two or more transition metals is well known in literature. Mixed‐metal catalysts, e. g. Co−Fe‐based, [7,13,22,25,59,60] Ni−Fe‐based [7,25,26,59,61–63] or Co−Ni‐based [7,45,59,64–67] have been investigated before. In most of these studies, the mixture of the transition metals enhanced the electrochemical performance in comparison to the mono‐metallic phase.…”

Section: Resultsmentioning

confidence: 99%

Efficient Oxygen Evolution Electrocatalyst by Incorporation of Nickel into Nanoscale Dicobalt Boride

et al. 2021

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Recently, transition metal borides attracted increased attention as electrocatalysts for the oxygen evolution reaction. Here, we show how the incorporation of nickel into nanoscale dicobalt boride results in an improvement of the activity and stability of the catalyst in alkaline electrolytes. The borides are obtained by a one‐step solution synthesis, calcined, and characterized by X‐ray diffraction and scanning electron microscopy. For (Co1‐xNix)2B (x=0, 0.1, 0.2, 0.3, 0.4, and 0.5), (Co0.9Ni0.1)2B shows the best performance with an overpotential of η=371 mV at 10 mA cm−2 in 1 M KOH. Normalization to the electrochemical surface area shows a clear dependence on the activity with rising nickel content. X‐ray photoelectron spectroscopy reveals that the catalyst is modified under reaction conditions and indicates that CoOOH and Ni(OH)2 are formed as active surface species. Flame atomic absorption spectroscopy (F‐AAS) measurements show that no cobalt is dissolved during the electrochemical investigations, but the nickel concentration is increased on the surface of the catalyst as follows from XPS measurements after the electrochemical investigation.

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Nanostructured NiCo@NiCoOx core-shell layer as efficient and robust electrocatalyst for oxygen evolution reaction

Cited by 39 publications

References 63 publications

Nanostructured core–shell metal borides–oxides as highly efficient electrocatalysts for photoelectrochemical water oxidation

Nanostructured core–shell metal borides–oxides as highly efficient electrocatalysts for photoelectrochemical water oxidation

Synthesis of a Highly Efficient Oxygen‐Evolution Electrocatalyst by Incorporation of Iron into Nanoscale Cobalt Borides

Efficient Oxygen Evolution Electrocatalyst by Incorporation of Nickel into Nanoscale Dicobalt Boride

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