Design and Synthesis of FeOOH/CeO<sub>2</sub> Heterolayered Nanotube Electrocatalysts for the Oxygen Evolution Reaction

Feng, Jin‐Xian; Ye, Shenghua; Xu, Han; Tong, Yexiang; Li, Gao‐Ren

doi:10.1002/adma.201600054

Cited by 609 publications

(356 citation statements)

References 59 publications

(49 reference statements)

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“…[11][12][13][14][15] Over the past decades, great progress has been achieved on the development of non-noble metal-based electrocatalysts for both OER and HER. Various nonprecious metal oxides, [9] sulfides, [16] selenides, [17] phosphides, and nitrides [18,19] have been exploited. Among these electrocatalysts, cobalt sulfide (Co 9 S 8 ) is regarded as an attractive electrocatalyst for water splitting due to its high catalytic activity for HER and OER simultaneously, and excellent electrochemical stability.…”

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confidence: 99%

Hollow TiO₂@Co₉S₈ Core–Branch Arrays as Bifunctional Electrocatalysts for Efficient Oxygen/Hydrogen Production

et al. 2017

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water splitting is recognized as a highly potential technology to convert electricity into environment friendly and renewable chemical fuels (hydrogen and oxygen). [1][2][3] The cathodic hydrogen evolution reaction (HER) and anodic oxygen evolution reaction (OER) depend heavily on the development of cost-effective high-performance electrocatalysts. [4,5] Currently, platinum (Pt)/Pt-based alloy and iridium/ruthenium oxides (IrO 2 /RuO 2 ) are considered as the most promising electrocatalysts for HER and OER, respectively, but their scarcity, high cost, and compromised stability hinder their widespread applications. [6,7] Additionally, the best working situation for those OER and HER catalysts is often mismatchable since OER preferably takes place in alkaline or neutral solution while HER in acidic medium. [8,9] This would cause compromised performance for overall water splitting. For instance, the commercial alkaline electrolyzers require high cell voltages (1.8-2.0 V) to drive water splitting, [10] far ahead of the theoretical value of ≈1.23 V owing to high overpotentials on the sluggish of OER and HER. Therefore, it is highly desirable to explore alternative high-performance and low-cost bifunctional OER/HER electrocatalysts for overall water splitting. [11][12][13][14][15] Over the past decades, great progress has been achieved on the development of non-noble metal-based electrocatalysts for both OER and HER. Various nonprecious metal oxides, [9] sulfides, [16] selenides, [17] phosphides, and nitrides [18,19] have been exploited. Among these electrocatalysts, cobalt sulfide (Co 9 S 8 ) is regarded as an attractive electrocatalyst for water splitting due to its high catalytic activity for HER and OER simultaneously, and excellent electrochemical stability. In comparison to bulk Co 9 S 8 , nanostructured Co 9 S 8 and its composites could afford more active sites and faster transfer rate of ions/electrons during the electrocatalytic reaction, and thus usually exhibiting enhanced HER and OER activities. [20][21][22][23][24] Currently, several Co 9 S 8 nanostructures (e.g., nanoparticles [25] and nanospheres [26] ) and their composites with carbons (Co 9 S 8 /reduced graphene oxides (RGO), [22] Co 9 S 8 /(N, S, P)-doped carbons, [27] Co 9 S 8 /Fe 3 O 4 / RGO, [23] and Co 9 S 8 /MoS 2 /Carbon fibres [25] ) have been reported. For example, Co 9 S 8 /N,P-carbon powder nanocomposites prepared by molten-salt calcination method at 900 °C exhibited an HER overpotential of 261 mV at 10 mA cm −2 in alkaline medium. [20] N-Co 9 S 8 /graphene nanocomposites was achieved Designing ever more efficient and cost-effective bifunctional electrocatalysts for oxygen/hydrogen evolution reactions (OER/HER) is greatly vital and challenging. Here, a new type of binder-free hollow TiO 2 @Co 9 S 8 core-branch arrays is developed as highly active OER and HER electrocatalysts for stable overall water splitting. Hollow core-branch arrays of TiO 2 @Co 9 S 8 are readily realized by the rational combination of crosslinked Co 9 S 8 nanoflakes on ...

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Hollow TiO₂@Co₉S₈ Core–Branch Arrays as Bifunctional Electrocatalysts for Efficient Oxygen/Hydrogen Production

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“…38 However, after CeO 2 NPs were deposited on the Ni(OH) 2 nanosheets, the ratio of Ce 3+ : Ce 4+ in the CeO 2 /Ni(OH) 2 hybrid changed compared with pure CeO 2 NPs, indicating that the valence states of Ce in the CeO 2 /Ni(OH) 2 hybrid rearranged. 28 As shown in Fig. 4f, the XPS spectrum of Ni 2p in Ni(OH) 2 /NOSCF showed two major peaks at 853.2 and 870.8 eV corresponding to Ni 2p 3/2 and Ni 2p 1/2 , respectively, which were characteristic of the Ni 2+ state.…”

Section: Resultsmentioning

confidence: 85%

“…Recently, Li et al developed an efficient OER electrocatalyst by supporting FeOOH/CeO 2 on Ni foam and exhibited enhanced OER performance compared with pure FeOOH. 28 They also demonstrated the unique high OSC properties of CeO 2 , such that CeO 2 can straightway absorb the oxygen produced during the OER and accordingly promote the OER. Therefore, the combination of Ni(OH) 2 and CeO 2 to form a CeO 2 /Ni(OH) 2 hybrid will be an efficient route to improve the electrocatalytic performance of Ni(OH) 2 via improving the energy conversion efficiency, and thereby promoting the generation of active species of Ni III/IV for enhancing the OER performance.…”

Section: Introductionmentioning

confidence: 99%

Regulating the active species of Ni(OH)₂ using CeO₂: 3D CeO₂/Ni(OH)₂/carbon foam as an efficient electrode for the oxygen evolution reaction

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“…[28] TheN yquist plots revealed that the semicircular diameter of Ni-Fe-MOF NSs was smaller than that of XPS was carried out to understand the effect of mixed metals on OER catalysis.C ompared with the Ni-MOF NSs, the peaks of Ni 2p 3/2 and Ni 2p 1/2 in the high-resolution Ni 2p spectrum of the Ni-Fe-MOF NSs shifted to as lightly higher binding energy (a shift of approximately 0.3 eV), indicating amodified local electronic structure of Ni (Figure 3d). [29] Thes tructure-activity relationship (SAR) of these MOF NSs was further studied. The peak shifts and density changes of Ni 2p and Fe 2p indicated strong electronic interactions between the two metals in Ni-Fe-MOF NSs,which could modify the catalytic performance of electrocatalysts.…”

Section: Angewandte Chemiementioning

confidence: 99%

Large‐Scale, Bottom‐Up Synthesis of Binary Metal–Organic Framework Nanosheets for Efficient Water Oxidation

et al. 2019

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Ultrathin metal-organic framework (MOF) nanosheets (NSs) offer potential for many applications,b ut the synthetic strategies are largely limited to top-down, low-yield exfoliation methods.H erein, Ni-M-MOF (M = Fe,A l, Co, Mn, Zn, and Cd) NSs are reported with at hickness of only several atomic layers,p repared by al arge-scale,b ottom-up solvothermal method. The solvent mixture of N,N-dimethylacetamide and water playskey role in controlling the formation of these two-dimensional MOF NSs.T he MOF NSs can be directly used as efficient electrocatalysts for the oxygen evolution reaction, in which the Ni-Fe-MOF NSs deliver ac urrent density of 10 mA cm À2 at al ow overpotential of 221 mV with asmall Tafel slope of 56.0 mV dec À1 ,and exhibit excellent stability for at least 20 hw ithout obvious activity decay. Density functional theory calculations on the energy barriers for OER occurring at different metal sites confirm that Fe is the active site for OER at Ni-Fe-MOF NSs.Supportinginformation and the ORCID identification number(s) for the author(s) of this article can be found under: https://doi.

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Design and Synthesis of FeOOH/CeO₂ Heterolayered Nanotube Electrocatalysts for the Oxygen Evolution Reaction

Cited by 609 publications

References 59 publications

Hollow TiO₂@Co₉S₈ Core–Branch Arrays as Bifunctional Electrocatalysts for Efficient Oxygen/Hydrogen Production

Hollow TiO₂@Co₉S₈ Core–Branch Arrays as Bifunctional Electrocatalysts for Efficient Oxygen/Hydrogen Production

Regulating the active species of Ni(OH)₂ using CeO₂: 3D CeO₂/Ni(OH)₂/carbon foam as an efficient electrode for the oxygen evolution reaction

Large‐Scale, Bottom‐Up Synthesis of Binary Metal–Organic Framework Nanosheets for Efficient Water Oxidation

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Design and Synthesis of FeOOH/CeO2 Heterolayered Nanotube Electrocatalysts for the Oxygen Evolution Reaction

Cited by 609 publications

References 59 publications

Hollow TiO2@Co9S8 Core–Branch Arrays as Bifunctional Electrocatalysts for Efficient Oxygen/Hydrogen Production

Hollow TiO2@Co9S8 Core–Branch Arrays as Bifunctional Electrocatalysts for Efficient Oxygen/Hydrogen Production

Regulating the active species of Ni(OH)2 using CeO2: 3D CeO2/Ni(OH)2/carbon foam as an efficient electrode for the oxygen evolution reaction

Large‐Scale, Bottom‐Up Synthesis of Binary Metal–Organic Framework Nanosheets for Efficient Water Oxidation

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Design and Synthesis of FeOOH/CeO₂ Heterolayered Nanotube Electrocatalysts for the Oxygen Evolution Reaction

Hollow TiO₂@Co₉S₈ Core–Branch Arrays as Bifunctional Electrocatalysts for Efficient Oxygen/Hydrogen Production

Hollow TiO₂@Co₉S₈ Core–Branch Arrays as Bifunctional Electrocatalysts for Efficient Oxygen/Hydrogen Production

Regulating the active species of Ni(OH)₂ using CeO₂: 3D CeO₂/Ni(OH)₂/carbon foam as an efficient electrode for the oxygen evolution reaction