Self-Supporting Metal-Organic Framework-Based Nanoarrays for Electrocatalysis

Li, Fayan; Du, Meng; Xiao, Xin; Xu, Qiang

doi:10.1021/acsnano.2c09396

Cited by 52 publications

(25 citation statements)

References 225 publications

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“…So far, the controlled growth of MOFs on different substrate surfaces, especially chemically inert surfaces, remains a challenge because there are limited number of nucleation sites. [ 200 ] During the synthesis, surface defects, selected organic functional groups or metal layers on the surfaces provide accessible sites to allow the nucleation and conformal growth of MOFs. In a previous work, we have systematically investigated the growth of MOF nanoarrays on various substrates, such as Ni foam, Si or glass slides.…”

Section: Self‐supported 2d Mof For Electrocatalytic Water Splittingmentioning

confidence: 99%

2D Metal–Organic Frameworks as Competent Electrocatalysts for Water Splitting

Wang

Lin

Cui

et al. 2023

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water splitting (2H 2 O → 2H 2 + O 2 ) comprises two half-reactions: hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). Theoretically, the decomposition voltage of water splitting is 1.23 V. [4] Nevertheless, the actual voltage is greater than the theoretical voltage of water dissociation due to the large activation energy. [5] To accelerate the sluggish HER and OER kinetics, efficient electrocatalysts are required to reduce kinetic energy barriers. Currently, the most efficient electrocatalysts toward water splitting are precious metal-based catalysts such as Pt/C for HER and RuO 2 or IrO 2 for OER. [6] Unfortunately, the large-scale application is hindered by the high price and scarcity of noble metals. Therefore, it is urgent to seek highly active and inexpensive electrocatalysts.Metal-organic frameworks (MOFs) are an emerging class of porous crystalline materials constructed by metal ions or clusters and organic ligands. [7][8][9] Due to their unique merits of large porosities, diversified structures, and designable compositions, MOFs have gained extensive attention in various applications, such as chemical sensors, [10] gas absorption, [11] and energy conversion/storage. [12][13][14][15][16] From an electrochemical perspective, MOFs can be perceived as a spatial architecture, where discrete functional units can be designed to lie in close proximity to facilitate bond breaking/forming reactions. [17] Generally, active sites and conductivity are considered as the key factors affecting the electrochemical performance of HER and OER catalysts. Despite abundant intrinsic molecular metal sites, large size and poor conductivity (10 −10 S cm −1 ) of bulk MOFs restrict the full use of their distinct advantages and lead to poor electrochemical performance. [18] To improve electrocatalytic activity of MOFs, they can be used as sacrificial precursors or templates to fabricate various conductive carbides, [19] oxides/hydroxides, [20] phosphides, [21] chalcogenides, [22] single-atom catalysts [23] or pure carbon materials with rich morphologies and sizes. [24,25] However, the high temperatures calcination inevitably leads to the loss of intrinsic active sites and long-range orders in MOFs. Therefore, improving the catalytic properties of pristine MOFs for highly efficient electrocatalysts is quite appealing.Compared with bulk MOFs, 2D MOFs emerge as a category of promising electrocatalysts toward HER or OER due to their unique characteristics, including enlarged surface areas, rapid mass transport, and enhanced conductivities (Figure 1). [26,27] Hydrogen, a clean and flexible energy carrier, can be efficiently produced by electrocatalytic water splitting. To accelerate the sluggish hydrogen evolution reaction and oxygen evolution reaction kinetics in the splitting process, highly active electrocatalysts are essential for lowering the energy barriers, thereby improving the efficiency of overall water splitting. Combining the distinctive advantages of metal-organic frameworks (MOFs) with the physicochemi...

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Section: Self‐supported 2d Mof For Electrocatalytic Water Splittingmentioning

confidence: 99%

2D Metal–Organic Frameworks as Competent Electrocatalysts for Water Splitting

Wang

Lin

Cui

et al. 2023

Small

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“…Due to the easier adjustability of interlayer spacing, the interlayer metal ions of LDHs are capable of coordinating with organic ligands, including the conductive polymers and metal-organic framework to construct organic/LDHs heterojunctions to enhance the electrocatalytic activity of LDH [ 111 , 112 , 113 , 114 ]. Huang et al prepared the electron-rich NiFe-LDH loaded on carbon paper modified by polyaniline (PANI) via the first electrodeposition and followed by the hydrothermal method ( Figure 13 a) [ 113 ].…”

Section: Heterojunction Strategymentioning

confidence: 99%

Recent Advances of Modified Ni (Co, Fe)-Based LDH 2D Materials for Water Splitting

Bao

Liu

et al. 2023

Molecules

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Water splitting technology is an efficient approach to produce hydrogen (H2) as an energy carrier, which can address the problems of environmental deterioration and energy shortage well, as well as establishment of a clean and sustainable hydrogen economy powered by renewable energy sources due to the green reaction of H2 with O2. The efficiency of H2 production by water splitting technology is intimately related with the reactions on the electrode. Nowadays, the efficient electrocatalysts in water splitting reactions are the precious metal-based materials, i.e., Pt/C, RuO2, and IrO2. Ni (Co, Fe)-based layered double hydroxides (LDH) two-dimensional (2D) materials are the typical non-precious metal-based materials in water splitting with their advantages including low cost, excellent electrocatalytic performance, and simple preparation methods. They exhibit great potential for the substitution of precious metal-based materials. This review summarizes the recent progress of Ni (Co, Fe)-based LDH 2D materials for water splitting, and mainly focuses on discussing and analyzing the different strategies for modifying LDH materials towards high electrocatalytic performance. We also discuss recent achievements, including their electronic structure, electrocatalytic performance, catalytic center, preparation process, and catalytic mechanism. Furthermore, the characterization progress in revealing the electronic structure and catalytic mechanism of LDH is highlighted in this review. Finally, we put forward some future perspectives relating to design and explore advanced LDH catalysts in water splitting.

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“…Due to the easier adjustability of interlayer spacing, the interlayer metal ions of LDHs are capable of coordinating with organic ligands including the conductive polymers and metal-organic framework to construct organic/LDHs heterojunctions to enhance electrocatalytic activity of LDH [111][112][113][114]. Huang et al prepared the electron-rich NiFe-LDH loaded on carbon paper modified by polyaniline (PANI) via the first electrodeposition and followed by hydrothermal method (Figure 13a) [113].…”

Section: Organic Materialsmentioning

confidence: 99%

Recent Advances of Modified Ni (Co, Fe)-based LDH 2D Materials for Water Splitting

Li¹,

Bao²,

Liu³

et al. 2023

Preprint

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Water splitting technology is an efficient approach to generate hydrogen (H2) energy, which can well address the problems of environmental deterioration and energy shortage, as well as establishment of a clean and sustainable hydrogen economy powered by renewable energy sources due to the green reaction of H2 with O2. While the efficiency of H2 production by water splitting technology is intimately related with the reactions on electrode. Nowadays, the efficient electrocatalysts in water splitting reactions are the precious metal-based materials, i.e., Pt/C, RuO2 and IrO2. Ni (Co, Fe)-based layered double hydroxides (LDH) 2D materials are the typical non-precious metal-based materials in water splitting with advantages of low cost, excellent electrocatalytic performance and simple preparation methods, which exhibits a great potential for the substitution for precious metal-based materials. This review summarizes the recent progress of Ni (Co, Fe)-based LDH 2D materials for water splitting, which mainly focuses on discussing and analyzing the different strategies to modify LDH materials towards high electrocatalytic performance. We also discuss the recent achievements including their electronic structure, electrocatalytic performance, catalytic center, preparation process and catalytic mechanism. Furthermore, the characterization progress in revealing electronic structure and catalytic mechanism of LDH is highlighted in this review. Finally, we put forward some future perspectives related to design and explore advanced LDH catalysts in water splitting.

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Self-Supporting Metal-Organic Framework-Based Nanoarrays for Electrocatalysis

Cited by 52 publications

References 225 publications

2D Metal–Organic Frameworks as Competent Electrocatalysts for Water Splitting

2D Metal–Organic Frameworks as Competent Electrocatalysts for Water Splitting

Recent Advances of Modified Ni (Co, Fe)-Based LDH 2D Materials for Water Splitting

Recent Advances of Modified Ni (Co, Fe)-based LDH 2D Materials for Water Splitting

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