Ultrathin metal–organic framework nanosheets for electrocatalytic oxygen evolution

Zhao, Shenlong; Wang, Yun; Dong, Juncai; He, Chun‐Ting; Yin, Huajie; An, Pengfei; Zhao, Kun; Zhang, Xiaofei; Gao, Chao; Zhang, Lijuan; Lv, Jiawei; Wang, Jinxin; Zhang, Jianqi; Khattak, Abdul Muqsit; Khan, Niaz Ali; Wei, Zhixiang; Zhang, Jing; Liu, Shaoqin; Zhao, Huijun; Tang, Zhiyong

doi:10.1038/nenergy.2016.184

Cited by 2,286 publications

(1,721 citation statements)

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“…ChemSusChem 2017, 10,4374 -4392 www.chemsuschem.org lysts. [116] NiCo-based thin MOF nanosheets, [108] aN iFe MOF array, [109] and an iron-cobalt carboxylate framework (Fe 3 -Co 2 ) [110] exhibit highere lectrocatalytic OER activity than commercial RuO 2 and IrO 2 .T hese examples demonstrate the viability of MOFs as alternatives to precious-metal-based heterogeneous electrocatalysts.…”

Section: Resultsmentioning

confidence: 99%

“…[108] NiCo-UMOFNs were deposited on GCEs (0.2 mg cm À2 )b yu sing Nafion as ab inder,a nd they exhibited an onset for the OER at 1.42 Vv ersus RHE in 1 m KOH (Figure 4b). Rotating ring disk electrode (RRDE) voltammetry and gas chromatography (GC) confirmed the production of O 2 .T he overpotential to reach 10 mA cm À2 was 250 mV (Figure 4b).…”

Section: Bimetallic Mofsmentioning

confidence: 99%

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Electrocatalytic Metal–Organic Frameworks for Energy Applications

2017

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With the global energy demand expected to increase drastically over the next several decades, the development of a sustainable energy system to meet this increase is paramount. Renewable energy sources can be coupled with electrochemical conversion processes to store energy in chemical bonds. To promote these difficult transformations, electrocatalysts that operate at high conversion rates and efficiency are required. Metal–organic frameworks (MOFs) have emerged as a promising class of materials; however, the insulating nature of MOFs has limited their application as electrocatalysts. The recent development of conductive MOFs has led to several electrocatalytic MOFs that display activity comparable to that of the best‐performing heterogeneous catalysts. Although many electrocatalytic MOFs exhibit low activity and stability, the few successful examples highlight the possibility of MOF electrocatalysts as replacements for noble‐metal‐based catalysts in commercial energy‐converting devices. We review herein the use of pristine MOFs as electrocatalysts to facilitate important energy‐related reactions.

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Section: Resultsmentioning

confidence: 99%

Section: Bimetallic Mofsmentioning

confidence: 99%

Electrocatalytic Metal–Organic Frameworks for Energy Applications

2017

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“…To this end, considerable efforts have been devoted to developing nanoscale heterogeneous catalysts that can increase the exposed surface atoms 3 . However, the inhomogeneity in the distribution of particle sizes and facets poses a serious challenge for controlling active sites and fundamental mechanistic studies 6,7 . In contrast, homogeneous catalysts typically exhibit the well-defined atomic structure with tunable coordination environment that is essential for deciphering the catalytic reaction pathway and rational design of targeted catalysts with tailored catalytic properties 8 .…”

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General synthesis and definitive structural identification of MN4C4 single-atom catalysts with tunable electrocatalytic activities

et al. 2018

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E fficient and cost-effective electrocatalysts play critical roles in energy conversion and storage [1][2][3] . Homogeneous and heterogeneous catalysts represent two parallel frontiers of electrocatalysts, each with their own merits and drawbacks 4,5 . Homogeneous catalysts are attractive for their highly uniform active sites, tunable coordination environment and maximized atom utilization efficiency, but are limited by their relatively poor stability and recyclability. Heterogeneous catalysts are appealing for their high durability, excellent recyclability, and easy immobilization and integration with electrodes, but usually have rather low atom utilization efficiency due to the limited surface sites accessible to reactants. To this end, considerable efforts have been devoted to developing nanoscale heterogeneous catalysts that can increase the exposed surface atoms 3 . However, the inhomogeneity in the distribution of particle sizes and facets poses a serious challenge for controlling active sites and fundamental mechanistic studies 6,7 . In contrast, homogeneous catalysts typically exhibit the well-defined atomic structure with tunable coordination environment that is essential for deciphering the catalytic reaction pathway and rational design of targeted catalysts with tailored catalytic properties 8 . Single-atom catalysts (SACs) with monodispersed single atoms supported on solid substrates are recently emerging as an exciting class of catalysts that combine the merits of both homogeneous and heterogeneous catalysts [9][10][11][12][13][14] . However, most SACs studied to date employ metal oxides (for example, TiO 2 , CeO 2 and FeO x ) as supporting substrates to prevent atom aggregation [15][16][17][18] , which cannot be readily applied in electrocatalytic applications due to their low electrical conductivity and/or poor stability in harsh liquid-phase electrolytes (for example, strong acid or base). Atomic transitionmetal-nitrogen moieties supported in carbon (M-N-Cs) represent a unique class of SACs with high electrical conductivity and superior (electro)chemical stability for electrocatalytic applications 19 . In particular, Fe-based M-N-Cs have been extensively studied as electrocatalysts towards the oxygen reduction reaction (ORR) with demonstrated activity and stability approaching those of commercial Pt/C catalysts 20,21 . In addition, as suggested by numerous theoretical studies, M-N-Cs are promising candidates for catalysing a wide range of electrochemical processes, such as hydrogen reduction/oxidation 22 , CO 2 /CO reduction 23 and N 2 reduction 24 . A significant advantage of SACs is that the well-defined single atomic site could allow precise understanding of the catalytic reaction pathway, and rational design of targeted catalysts with tailored activity (in a manner similar to homogeneous catalyst design). However, this perceived advantage has been investigated theoretically

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“…[1][2][3] Specifically,e lectrochemical water splitting is considered as ap romising approach to obtain clean fuels from renewable but intermittent energy sources. [4,5] However,t he realization of af ully integrated water-splitting system has been largely hindered by the sluggish anodic oxygen evolution reaction (OER). [6] In this regard, an appropriate catalyst is necessary to accelerate the OER at low overpotentials (h)for enhanced energy conversion efficiencies.…”

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Hierarchical Hollow Nanoprisms Based on Ultrathin Ni‐Fe Layered Double Hydroxide Nanosheets with Enhanced Electrocatalytic Activity towards Oxygen Evolution

et al. 2017

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The oxygen evolution reaction (OER) is involved in various renewable energy systems,such as water-splitting cells and metal-air batteries.N i-Fel ayered double hydroxides (LDHs) have been reported as promising OER electrocatalysts in alkaline electrolytes.T he rational design of advanced nanostructures for Ni-FeLDHs is highly desirable to optimize their electrocatalytic performance.H erein, we report af acile self-templated strategy for the synthesis of novel hierarchical hollown anoprisms composed of ultrathin Ni-FeL DH nanosheets.T etragonal nanoprisms of nickel precursors were first synthesized as the self-sacrificing template.A fterwards, these Ni precursors were consumed during the hydrolysis of iron(II) sulfate for the simultaneous growth of al ayer of Ni-FeL DH nanosheets on the surface.T he resultant Ni-FeL DH hollow prisms with large surface areas manifest high electrocatalytic activity towards the OER with lowo verpotential, small Tafel slope,and remarkable stability.

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Ultrathin metal–organic framework nanosheets for electrocatalytic oxygen evolution

Cited by 2,286 publications

References 45 publications

Electrocatalytic Metal–Organic Frameworks for Energy Applications

Electrocatalytic Metal–Organic Frameworks for Energy Applications

General synthesis and definitive structural identification of MN4C4 single-atom catalysts with tunable electrocatalytic activities

Hierarchical Hollow Nanoprisms Based on Ultrathin Ni‐Fe Layered Double Hydroxide Nanosheets with Enhanced Electrocatalytic Activity towards Oxygen Evolution

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