Amorphous cobalt–iron hydroxides as high-efficiency oxygen-evolution catalysts based on a facile electrospinning process

Guo, Zhenguo; Ye, Wen; Fang, Xiaoyu; Wan, Jian; Ye, Yaoyao; Dong, Yingying; Cao, Ding; Yan, Dongpeng

doi:10.1039/c8qi01320a

Cited by 109 publications

(60 citation statements)

References 59 publications

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“…These observations are also consistent with recently reported studies on the underlying structural instability and phase transformation of transition metal‐based CPs during OER. [ 13,42,74,75 ] In contrast, the rising‐edge of the XANES spectra for post‐catalytic R‐NiFe‐CPs only showed a slight positive shift as compared to the pristine sample (Figure S50, Supporting Information) while the basic pristine structure was maintained. This strongly suggests that the metal ions in the pristine samples were oxidized to high valence states, and these in situ formed highly oxidized species can be regarded as the real active species for OER.…”

Section: Resultsmentioning

confidence: 98%

Understanding and Optimizing Ultra‐Thin Coordination Polymer Derivatives with High Oxygen Evolution Performance

Zhao

Wan

Chen

et al. 2020

Advanced Energy Materials

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fuel shortage and climate change. [1] Noble metal-based materials (e.g., Pt and its alloys) have been well investigated and are among the most promising electrocatalysts for water splitting to generate clean hydrogen. [2,3] However, Pt group-based catalysts are still constrained by their scarcity and high cost for scalable and commercial electrocatalysis. Hence, the development of noble-metal-free catalysts with comparable catalytic activity and robust durability is an urgent task to realize technical applications of water electrolysis. [4,5] Coordination polymer assemblies (CPAs), which are composed of a metal center linked to organic or inorganic ligands combine tunable porous structures, well-dispersed metal sites, high surface areas, and good chemical stability. This renders them excellent materials for drug delivery, [6] gas storage and separation, [7] batteries, [8,9] and catalysis. [10-13] Thanks to their unique structural properties, transition metal-based CPAs keep attracting broad interest in the field of heterogeneous electrocatalysts. [9a,b-14] However, their intrinsic poor conductivity, low mass permeability, and confined active metal centers need to be systematically improved for their application as efficient electrocatalysts. Moreover, instability issues of the ligands such as self-oxidation or degradation at high oxidation potentials need to be resolved for directly using CPAs as long-term electrocatalysts. [14-17] Several strategies, for example, morphological modulation, electronic tuning, and surface modification, have been confirmed as promising approaches to improve the electrocatalytic performance of CPAs and CPs. [14,16-21] In a representative study, ultra-thin NiCo bimetallic CPA nanosheets with enhanced OER activity compared to bulk NiCo bimetallic CPAs, were synthesized through an ultrasonication exfoliation method. [14] Zhang et al. [16] demonstrated that monolayered heterogenous nanosheets of hybrid CoFeO x /CPAs were promising OER electrocatalysts. Some of us recently [20] proposed that the high and durable electrocatalytic activity of a new 1D cobalt coordination polymer (Co-dppeO 2) is due to its highly disordered structure, giving rise to exceptional resilience. Further theoretical calculations and in situ characterizations proved that the key architecture behind the high OER activity was arising from the {H 2 O-Co 2 (OH) 2-OH 2 } edge-site motifs. This study demonstrated the high potential of low-cost Engineering low-crystalline and ultra-thin nanostructures into coordination polymer assemblies is a promising strategy to design efficient electrocatalysts for energy conversion and storage. However, the rational utilization of coordination polymers (CPs) or their derivatives as electrocatalysts has been hindered by a lack of insight into their underlying catalytic mechanisms. Herein, a convenient approach is presented where a series of Ni 10-x Fe x-CPs (0 ≤ x ≤ 5) is first synthesized, followed by the introduction of abundant structural deficiencies using a facile reductive method ...

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Section: Resultsmentioning

confidence: 98%

Understanding and Optimizing Ultra‐Thin Coordination Polymer Derivatives with High Oxygen Evolution Performance

Zhao

Wan

Chen

et al. 2020

Advanced Energy Materials

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“…Owing to the diversity of electron and orbital distribution, metals possess unique e g orbital occupancy. [ 51f,72 ] The formation of metal vacancy would lead to the augment of valence state of adjacent metal atoms, and then modulate the electronic structures of the active sites. For example, Kuang and co‐workers proposed metal defect‐rich NiFe LDHs via selective alkaline etching ( Figure 9 ), which showed high OER performance.…”

Section: Synthesis and Modificationsmentioning

confidence: 99%

Recent Advance of Transition‐Metal‐Based Layered Double Hydroxide Nanosheets: Synthesis, Properties, Modification, and Electrocatalytic Applications

Liu

Lai

et al. 2021

Advanced Energy Materials

148

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Nowadays, to alleviate the growing pressure of energy shortages and environmental pollution, electrochemical energy conversion is seen as a fossil‐free, secondary pollution‐free, and highly efficiency pathway. Electrocatalysts, as the “heart” of the electrochemical conversion process, play a key role in accelerating reaction rates and promoting efficiency. Transition‐metal‐based layered double hydroxides (TM LDHs), one of the famous electrocatalysts, show unique 2D supermolecular‐stratified structure, excellent electronic properties, and their raw materials are easily available. In this review, electrocatalysis‐related properties of TM LDHs and the state‐of‐the‐art synthesis methods of TM LDH‐based electrocatalysts are summarized. Modifications for promoting the development of TM LDH‐based electrocatalysts are included, such as carbon materials modification, defect engineering, and noble metal loading. Then, the application of TM LDH nanosheets in the field of electrocatalysis is reviewed in detail. Finally, recent challenges, ongoing improvements, and future expectations for TM LDH nanosheets are presented.

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“…[26][27] Afterward, various research efforts have been reported on incorporating Fe 3+ ions into the metal oxides/hydroxides to promote the electrocatalytic performances toward the OER. [28][29] In particular, nanostructured iron-cobalt oxide with alloys, 30 nanosheets, [31][32][33][34] nanofibers, 33 nanoparticles, 34 hierarchical, 35 and mesoporous structures, [36][37] have been examined as favorable electrode candidates for water oxidation catalysis. Among these, the mesoporous form of cobalt oxides is attractive for the OER, because the distinctive uninterrupted channels of mesoporous catalysts can assist the diffusion of electrolyte and the discharge of products during electrocatalysis.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of iron and vanadium co‐doped mesoporous cobalt oxide: An efficient and robust catalysts for electrochemical water oxidation

Amer¹,

Arunachalam

Ghanem

et al. 2021

Int J Energy Res

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Dual metal doping and optimization are considered as vital approaches for enhancing the electrocatalytic features toward oxygen evolution reaction.Herein, a sequence of Fe and V dual metal-doped mesoporous cobalt oxide (FeV/meso-Co) electrocatalysts was successfully synthesized through citric acid-assisted evaporation-induced self-assembly (EISA) method. The textural, morphological, crystallinity, and electrochemical activities of Fe/V-promoted meso-Co (124 m 2 /g) are found strongly associated with dual (Fe and V) metal concentration. Benefiting from the combined effect of FeV-doping, the FeV/meso-Co exhibited an extremely lower overpotential of 280 mV to reach 10 mA/cm 2 for oxygen evolution reaction (OER) in 1M KOH electrolyte, which was the considerably lowest value among the earlier catalysts, and the FeV/meso-Co showed similar features as IrO 2 electrodes. Furthermore, FeV/meso-Co electrodes display highly durable (>30 hours) electrocatalytic performance for OER. This inexpensive approach of producing transition dual metal-doped mesoporous materials offers excellent promise for fabricating efficient catalysts and other electrochemical energy-conversion devices.

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Amorphous cobalt–iron hydroxides as high-efficiency oxygen-evolution catalysts based on a facile electrospinning process

Abstract: The first example of amorphous CoFe hydroxide based on the electrospinning process was developed, which was used as an efficient OER catalyst.

Cited by 109 publications

References 59 publications

Understanding and Optimizing Ultra‐Thin Coordination Polymer Derivatives with High Oxygen Evolution Performance

Understanding and Optimizing Ultra‐Thin Coordination Polymer Derivatives with High Oxygen Evolution Performance

Recent Advance of Transition‐Metal‐Based Layered Double Hydroxide Nanosheets: Synthesis, Properties, Modification, and Electrocatalytic Applications

Synthesis of iron and vanadium co‐doped mesoporous cobalt oxide: An efficient and robust catalysts for electrochemical water oxidation

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