Selective anodes for seawater splitting via functionalization of manganese oxides by a plasma-assisted process

Bigiani, Lorenzo; Barreca, Davide; Gasparotto, Alberto; Andreu, Teresa; Verbeeck, Johan; Sada, Cinzia; Modin, Evgeny; Lebedev, Oleg I.; Morante, J. R.; Maccato, Chiara

doi:10.1016/j.apcatb.2020.119684

Cited by 86 publications

(94 citation statements)

References 77 publications

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“…Regardless of the synthesis conditions, the binding energy (BE) and spin‐orbit‐separation (SOS) of the Co2p peak [Figure 2b; BE(Co2p 3/2 ) = 780.2 eV; SOS = 15.2 eV], along with the low intensity of shake‐up satellites, confirmed the formation of Co 3 O 4 as the predominant cobalt oxide. [ 17,21,35,47,53,56,57 ] This conclusion was further supported by calculation of the cobalt Auger parameter (see also Figure 2c; α = 1552.6 eV). [ 47,56 ] As far as the Fe2p peak is concerned [Figure 2d; BE(Fe2p 3/2 ) = 711.2 eV; SOS = 13.4 eV], its spectral features were in good agreement with previous literature data for Fe 2 O 3.…”

Section: Resultsmentioning

confidence: 56%

“…In addition, the slight decrease of the overall diffracted intensity concerning specimen Co(CVD) was ascribed to plasma‐surface interactions and ion bombardment of Co oxide upon Fe 2 O 3 deposition. [ 53 ] This phenomenon was responsible for a concomitant increase of O defects content (see below and Figure S2, Supporting Information). The lack of reflections for samples Co(S)‐Fe(S) and Fe(S) suggested that the mild RF‐sputtering conditions adopted herein yielded the deposition of relatively low cobalt/iron oxide amounts, [ 20,54 ] as indeed confirmed by complementary analytical results (see below).…”

Section: Resultsmentioning

confidence: 99%

“…[ 47,56 ] As far as the Fe2p peak is concerned [Figure 2d; BE(Fe2p 3/2 ) = 711.2 eV; SOS = 13.4 eV], its spectral features were in good agreement with previous literature data for Fe 2 O 3. [ 46,47,53 ]…”

Section: Resultsmentioning

confidence: 99%

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Plasma‐Assisted Synthesis of Co₃O₄‐Based Electrocatalysts on Ni Foam Substrates for the Oxygen Evolution Reaction

Maccato

Bigiani

Girardi

et al. 2021

Adv Materials Inter

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Electrocatalytic oxygen evolution reaction (OER) plays a key role in sustainable energy conversion and storage, but is severely hampered by the lack of efficient catalysts, whose development remains a critical and challenging issue. Herein, it is reported for the first time that pure and Fe2O3‐containing Co3O4‐based OER electrocatalysts are grown on highly porous Ni foams by plasma enhanced‐chemical vapor deposition and/or radiofrequency sputtering. Thanks to the inherent advantages of cold plasma synthesis routes, Ni foam supports are efficiently infiltrated by Co3O4 nanostructures and eventually nanosized Fe2O3, allowing a fine‐tuning of their mutual content, nano‐organization, and oxygen defectivity. For Co3O4‐Fe2O3 systems, these issues enable current densities up to ≈120 mA cm−2 at 1.79 V versus the reversible hydrogen electrode, an overpotential of ≈350 mV at 10 mA cm−2 and a Tafel slope as low as 60 mV dec−1, favorably comparing with literature values for most cobalt‐based OER catalysts reported so far. Such features, accompanied by a good time stability, represent an important goal for eventual practical applications and candidate the proposed fabrication route as a valuable tool for the design of efficient electrocatalysts with precisely engineered properties and based on naturally abundant transition elements.

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Section: Resultsmentioning

confidence: 56%

Section: Resultsmentioning

confidence: 99%

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Plasma‐Assisted Synthesis of Co₃O₄‐Based Electrocatalysts on Ni Foam Substrates for the Oxygen Evolution Reaction

Maccato

Bigiani

Girardi

et al. 2021

Adv Materials Inter

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“…Generally, catalysts with excellent catalytic activity are noble metals, such as Pt, IrO 2 , and RuO 2 ; however, their high price and low content prevent their large‐scale application. Therefore, researchers have replaced precious metals with nonprecious metals to minimize cost and achieve sustainability 42 . The electrocatalytic activities of metals in the periodic table for the HER (following Sabatier's principle) and OER vary with the change in the atomic number 43 .…”

Section: Metal Phosphides As Bifunctional Catalyst For Her and Oermentioning

confidence: 99%

“…The Tafel slope values and the current densities were ≈40 mV dec −1 and 13 mA cm −2 , respectively, which was superior to those of most Mn 2 O 3 ‐based catalysts. This work provided guidelines for selective seawater electrolysis 42 …”

Section: Metal Phosphides As Bifunctional Catalyst For Her and Oermentioning

confidence: 99%

Promotion effect of metal phosphides towards electrocatalytic and photocatalytic water splitting

Han

Chen

Fan

et al. 2021

EcoMat

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Hydrogen evolution from water splitting over semiconductors has been considered one of the most promising ways to address energy shortages and environmental pollution. Searching for low‐cost, highly efficient, and durable catalysts is the key to improve the hydrogen production rate. Expensive noble metals, such as Pt and Au, are generally loaded onto semiconductors to promote photocatalytic activity. Metal phosphides are promising candidates to replace noble metals in hydrogen generation via electrocatalytic or photocatalytic water splitting due to their low hydrogen‐producing overpotential, tunable electronic structure, high electrical conductivity, and low price. In this review article, the characteristics and synthetic methods of metal phosphides are briefly introduced, and the development of metal phosphides for electrocatalytic or photocatalytic water splitting is presented. Finally, the challenges and future directions of metal phosphides are discussed.

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Partial Sulfidation Strategy to NiFe‐LDH@FeNi₂S₄ Heterostructure Enable High‐Performance Water/Seawater Oxidation

Tan

Wang

et al. 2022

Adv Funct Materials

188

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The development of a high-performance electrocatalyst for oxygen evolution reaction (OER) is imperative but challenging. Here, a partial sulfidation route to construct Ni 2 Fe-LDH/FeNi 2 S 4 heterostructure on nickel foam (Ni 2 Fe-LDH/ FeNi 2 S 4 /NF) by adjusting the hydrothermal duration is reported. The heterostructures afford abundant hydroxide/sulfide interfaces that offer plentiful active sites, rapid charge and mass transfer, favorable adsorption energy to oxygenated species (OH − and OOH) evidenced by the density functional theory calculations, which synergistically boost the alkaline water oxidation. In the 1.0 m KOH solution, Ni 2 Fe-LDH/FeNi 2 S 4 /NF exhibits an excellent OER catalytic activity with a much smaller overpotential (240 mV) to reach the current density of 100 mA cm −2 than single-phase Ni 2 Fe-LDH/NF (279 mV) or FeNi 2 S 4 /NF (271 mV). More impressively, 2000 cycles of cyclic voltammetry scan for water oxidation results in the formation of a sulfate layer over the catalyst. The corresponding post-catalyst demonstrates better OER activity and durability than the initial one in the alkaline simulated seawater electrolyte. The post-Ni 2 Fe-LDH/FeNi 2 S 4 /NF delivers smaller overpotential (250 mV) at 100 mA cm −2 and longer stability time than the original form (260 mV). The post-formed sulfate passivating layer is responsible for the outstanding corrosion resistance of the salty-water oxidation anode since it can effectively repel chloride.

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Selective anodes for seawater splitting via functionalization of manganese oxides by a plasma-assisted process

Cited by 86 publications

References 77 publications

Plasma‐Assisted Synthesis of Co₃O₄‐Based Electrocatalysts on Ni Foam Substrates for the Oxygen Evolution Reaction

Plasma‐Assisted Synthesis of Co₃O₄‐Based Electrocatalysts on Ni Foam Substrates for the Oxygen Evolution Reaction

Promotion effect of metal phosphides towards electrocatalytic and photocatalytic water splitting

Partial Sulfidation Strategy to NiFe‐LDH@FeNi₂S₄ Heterostructure Enable High‐Performance Water/Seawater Oxidation

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Selective anodes for seawater splitting via functionalization of manganese oxides by a plasma-assisted process

Cited by 86 publications

References 77 publications

Plasma‐Assisted Synthesis of Co3O4‐Based Electrocatalysts on Ni Foam Substrates for the Oxygen Evolution Reaction

Plasma‐Assisted Synthesis of Co3O4‐Based Electrocatalysts on Ni Foam Substrates for the Oxygen Evolution Reaction

Promotion effect of metal phosphides towards electrocatalytic and photocatalytic water splitting

Partial Sulfidation Strategy to NiFe‐LDH@FeNi2S4 Heterostructure Enable High‐Performance Water/Seawater Oxidation

Contact Info

Product

Resources

About

Plasma‐Assisted Synthesis of Co₃O₄‐Based Electrocatalysts on Ni Foam Substrates for the Oxygen Evolution Reaction

Plasma‐Assisted Synthesis of Co₃O₄‐Based Electrocatalysts on Ni Foam Substrates for the Oxygen Evolution Reaction

Partial Sulfidation Strategy to NiFe‐LDH@FeNi₂S₄ Heterostructure Enable High‐Performance Water/Seawater Oxidation