Influence of cobalt on electrocatalytic water splitting in NiCoFe layered double hydroxides

Guzmán‐Vargas, Ariel; Vázquez-Samperio, Juvencio; Oliver-Tolentino, Miguel A.; Nava, N.; Castillo, N.; Macías-Hernández, Manuel J.; Reguera, E.

doi:10.1007/s10853-017-1882-z

Cited by 32 publications

(16 citation statements)

References 36 publications

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“…And the moderate intensity band near 1628 cm −1 was ascribed to the typical bending vibration of the water molecule. Moreover, the peak at low wavenumber was in associated with the stretching vibration of Ni–O . After reacting with K 3 [Fe(CN) 6 ] for 24 h, the appearance of the peaks near the 2000–2200 cm −1 was the typical cyano‐bridge (CN).…”

Section: Resultsmentioning

confidence: 99%

Transforming Nickel Hydroxide into 3D Prussian Blue Analogue Array to Obtain Ni₂P/Fe₂P for Efficient Hydrogen Evolution Reaction

Dong

Craig

et al. 2018

Advanced Energy Materials

202

112

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hydrogen evolution reaction (HER). However, the most active catalysts based on platinum had impeded the practical applications due to the high cost and the scarcity of platinum. [2,3] On the other hand, many studies have proven various metal sulfides and metal phosphides as efficient, low-cost substitutes for the rare earth metals. [4][5][6][7][8][9] With porous and hierarchal structure, metal-organic frameworks (MOFs) were largely applied to fabricate metal hydroxide, metal sulfide, and metal phosphide. [10][11][12][13][14][15] By using nickel and cobalt incorporated Prussian blue analogue (PBA), Yu had demonstrated how to obtain a hollow Ni-Co-MoS 2 cube that could reach a current density of 10 mA cm −2 with an overpotential of 155 mV in acid. [16] Likewise, Song had fabricated copper-doped cobalt phosphide originated from ZIF-67, which could reach a current density of 10 mA cm −2 with an applied overpotential of 160 mV. [12] Another study exhibited by Paik's group had revealed the Ni-Co PBA phosphide could reach a current density of 10 mA cm −2 with an overpotential of 150 mV. [17] Nonetheless, the good performance of these catalysts based on MOFs were not comparable with catalysts that grew on different substrates with organized structure. Generally, the catalysts growing on a substrate could reach a higher current density with a lower charge resistance and a larger active area. [18][19][20] As Sun's group had demonstrated, the Fe-doped CoP nanoarray on titanium foil could reach a current density of 10 mA cm −2 with an overpotential of 78 mV. When the applied overpotential was 230 mV, the current density was remarkable, with a value of 240 mA cm −2 . [21] To this end, we believe the HER performance of catalysts derived from MOFs could be largely improved if regular MOFs arrays were produced as precursor.Recently, Kitagawa has reported the synthesis of porous coordination polymers from a sacrificial metal oxide precursor, which was named as a pseudomorphic replication method. [22] During this pseudomorphic replication procedure, a secondary crystal structure was built while the primary morphology was conserved. Inspired by this method, Rabu has used layerstructured Cu 2 (OH) 3 (OAc)·H 2 O as both a metal reservoir and For the first time, a 3D Prussian blue analogue (PBA) with well-defined spatial organization is fabricated by using a nickel hydroxide array as a precursor. The nickel hydroxide arrays are synthesized in titanium foil and reacted with K 3 [Fe(CN) 6 ]. The plate-like morphology of the nickel hydroxide is perfectly preserved and combined with abundant PBA nanocubes. After phosphidation at 350 °C, the obtained sample demonstrated excellent hydrogen evolution reaction (HER) activity in both acid and alkaline solutions to reach a current density of 10 mA cm −2 with an overpotential of only 70 and 121 mV, respectively. With an overpotential of 266 mV, it can reach a larger current density of 500 mA cm −2 in acid. The efficient HER activity of the obtained sample is mainly ascribed to its structural adv...

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Section: Resultsmentioning

confidence: 99%

Transforming Nickel Hydroxide into 3D Prussian Blue Analogue Array to Obtain Ni₂P/Fe₂P for Efficient Hydrogen Evolution Reaction

Dong

Craig

et al. 2018

Advanced Energy Materials

202

112

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“…The higher OER activity is thought to be the modified binding strengths of O* and OOH* due to the hybridization of 3d orbitals of Co and 2p orbitals of O at the valence band maximum. NiCoFe LDH has also been reported by Reguera with an overpotential of 250 mV at 10 mA cm –2 . In this contribution, Co 3+ in low-spin configuration was thought to act as a shield of iron effect over nickel, which modulates the necessary potential for nickel oxidation.…”

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confidence: 69%

“…NiCoFe LDH has also been reported by Reguera with an overpotential of 250 mV at 10 mA cm –2 . 60 In this contribution, Co 3+ in low-spin configuration was thought to act as a shield of iron effect over nickel, which modulates the necessary potential for nickel oxidation.…”

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confidence: 99%

Effects of Metal Combinations on the Electrocatalytic Properties of Transition-Metal-Based Layered Double Hydroxides for Water Oxidation: A Perspective with Insights

2018

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Transition-metal-based layered double hydroxides (TM LDHs) have emerged as highly efficient water oxidation catalysts. They are promising and have the potential to replace the rare and expensive precious metal-based ones such as RuO 2 and IrO 2 , which have been well established. In this perspective, we will summarize the current development of TM LDHs as oxygen evolution reaction (OER) catalysts toward electrochemical water splitting. Particular emphasis will be placed on the roles of the transition-metal cations and the effects of their combination on their catalytic performance for the OER. It is hoped that this perspective will provide fundamental guidelines for future researches in this booming area.

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“…We note that previous experimental data showed that 25 % Fe content has higher efficiency than 50 %, but without reporting intermediate concentrations. The 33 % content of Co was selected because previous experiments showed a similar content of Fe and Co is important for better performance . At this configuration the neighboring atom to the active site is iron.…”

Section: Computational Detailsmentioning

confidence: 99%

“…Bates et al. studied ternary Ni−Fe−Co catalyst and found that the improvement in the OER performance is due to the charge transfer effect where cobalt tunes the iron sites by changing the M−OH bond lengths . All of these studies led us to theoretically study the addition of Co at different atomic locations in order to find out how Co changes the electronic structure and improves catalytic efficiency.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Fe and Co Additions on the Efficiency of NiOOH Catalyst Under Strain

Hamal

Toroker

2020

ChemCatChem

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The major limitation of using water splitting for generating hydrogen fuel is the lack of efficient catalysts for the oxygen evolution reaction (OER). A commonly used catalyst for OER is Nickel oxyhydroxide (NiOOH), but pure NiOOH has poor efficiency unless doped with Fe and Co. We explore the influence of co-doping on the efficiency of NiOOH in the process of water oxidation by using Density Functional Theory + U (DFT + U). We also test the effect of strain on catalytic efficiency by modeling water oxidation on expanded and contracted surfaces of NiFeCoOOH. We find that several doping locations of Co have a similar result as if NiFeOOH had no Co content. Iron is responsible for the high activity at the Fe active site due to the low energy required for charge extraction. Yet, the valence band edge includes Fe, Co and Ni states hybridized which allows better charge extraction during deprotonation. The valence band edge position is higher upon Co-doping, which should allow better hole transport toward the surface. Hence, the presence of Ni and Co atoms surrounding the active site is vital for better efficiency. Moreover, we found that applying strain does not improve the efficiency and therefore a substrate with minimal mismatch should be used for NiFe-CoOOH electrocatalysis.

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Influence of cobalt on electrocatalytic water splitting in NiCoFe layered double hydroxides

Cited by 32 publications

References 36 publications

Transforming Nickel Hydroxide into 3D Prussian Blue Analogue Array to Obtain Ni₂P/Fe₂P for Efficient Hydrogen Evolution Reaction

Transforming Nickel Hydroxide into 3D Prussian Blue Analogue Array to Obtain Ni₂P/Fe₂P for Efficient Hydrogen Evolution Reaction

Effects of Metal Combinations on the Electrocatalytic Properties of Transition-Metal-Based Layered Double Hydroxides for Water Oxidation: A Perspective with Insights

The Effect of Fe and Co Additions on the Efficiency of NiOOH Catalyst Under Strain

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Influence of cobalt on electrocatalytic water splitting in NiCoFe layered double hydroxides

Cited by 32 publications

References 36 publications

Transforming Nickel Hydroxide into 3D Prussian Blue Analogue Array to Obtain Ni2P/Fe2P for Efficient Hydrogen Evolution Reaction

Transforming Nickel Hydroxide into 3D Prussian Blue Analogue Array to Obtain Ni2P/Fe2P for Efficient Hydrogen Evolution Reaction

Effects of Metal Combinations on the Electrocatalytic Properties of Transition-Metal-Based Layered Double Hydroxides for Water Oxidation: A Perspective with Insights

The Effect of Fe and Co Additions on the Efficiency of NiOOH Catalyst Under Strain

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Transforming Nickel Hydroxide into 3D Prussian Blue Analogue Array to Obtain Ni₂P/Fe₂P for Efficient Hydrogen Evolution Reaction

Transforming Nickel Hydroxide into 3D Prussian Blue Analogue Array to Obtain Ni₂P/Fe₂P for Efficient Hydrogen Evolution Reaction