Mixed-Node Metal–Organic Frameworks as Efficient Electrocatalysts for Oxygen Evolution Reaction

Zhao, Xiaohua; Pattengale, Brian; Fan, Donghua; Zou, Zehua; Zhang, Yongqing; Du, Jing; Huang, Jier; Xu, Cailing

doi:10.1021/acsenergylett.8b01540

Cited by 283 publications

(176 citation statements)

References 43 publications

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“…When increasing the Fe content, the PXRD patterns of the Ni 10−x Fe x ‐CPs (Figure S1b,c, Supporting Information) still agree with the initial host crystal structure, while exhibiting a peak shift to lower angles at around 2θ ≈ 9.3°, suggesting the successful incorporation of Fe into the Ni‐CP lattice. [ 27 ] The structural functional groups and coordination environments of the Ni 10−x Fe x ‐CP samples were further corroborated by FTIR and Raman spectroscopy (Figures S2 and S3, Supporting Information). The obtained results demonstrated that the vibrational signature of Ni 10−x Fe x ‐CP samples did not significantly change, while some main vibration modes (e.g., M‐NC‐Ni) displayed a shift to lower wavenumbers due to the substitution of Ni by Fe.…”

Section: Resultsmentioning

confidence: 79%

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: 79%

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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“…The layered double hydroxides (LDH) with unique structure, abundant interstratified electrons and channels for intermediate adsorption and desorption display wonderful water splitting performance 17–20. Additionally, the metal–organic frameworks (MOFs) and their based nanocrystals as newly nanomaterials have got much attention in various fields, but their structure limited the active sites exposure for the complete coordinative metal sites 21–25. Therefore, it is important to enable the cost‐effective, large‐scale production of these catalysts, and further improve the performance and efficiency of overall water splitting.…”

Section: Introductionmentioning

confidence: 99%

Optimized Metal Chalcogenides for Boosting Water Splitting

et al. 2020

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splitting (2H 2 O → 2H 2 + O 2 ), consisting of hydrogen evolution and oxygen evolution reaction (HER/OER), can convert electricity to chemical energy in H 2 and O 2 for further energy applications. The practical application of overall water splitting, however, is still limited due to the lack of effective and stable catalysts to reduce reaction energy barrier and enhance Faraday efficient for both reactions. [6][7][8][9][10] Different materials have been studied for overall water splitting catalysis, like metal chalcogenides, metal carbides, oxides, etc. The transition metal carbides, especially graphene, have a better electroconductivity, ductility, and high surface area which display excellent performance in water splitting. [11][12][13] Oxides as another abundant species on the earth also show better water splitting performance, but their stability in hard media is not very good. [14][15][16] The layered double hydroxides (LDH) with unique structure, abundant interstratified electrons and channels for intermediate adsorption and desorption display wonderful water splitting performance. [17][18][19][20] Additionally, the metalorganic frameworks (MOFs) and their based nanocrystals as newly nanomaterials have got much attention in various fields, but their structure limited the active sites exposure for the complete coordinative metal sites. [21][22][23][24][25] Therefore, it is important to enable the cost-effective, large-scale production of these catalysts, and further improve the performance and efficiency of overall water splitting.Transition metal chalcogenides have many different compositions with various lattice structure, while those materials also have unique electronic structures. [26] Based on those superior properties, the transition metal chalcogenides show promising application in many energy applications, [27] such as electrochemical catalysis, photocatalysis, metal-air batteries, and other energy conversion reactions. Especially for their abundant defects sties, [26][27][28] tunable electronic structure, [29][30][31][32] and various morphology, [33][34][35][36][37] the transition metal chalcogenides exhibit boosting performance for water splitting. However, they still have some disadvantages, such as poor conductivity, activity, and stability, in water splitting limited their large-scale industrial application. [38][39][40][41][42] How to synthesize the active and stable transition metal chalcogenides is still a big challenge for wide application. In this Review, the several promising strategies are designed to prepare the active and stable transition metal chalcogenides (Scheme 1). → 2H 2 + O 2 ) is a very promising avenue to effectively and environmentally friendly produce highly pure hydrogen (H 2 ) and oxygen (O 2 ) at a large scale. Different materials have been developed to enhance the efficiency for water splitting. Among them, chalcogenides with unique atomic arrangement and high electronic transport show interesting catalytic properties in various electrochemical reactions, such as the ...

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“…Consequently, the obtained catalyst CoFeNi@CNTs delivered a low overpotential of 287 mV to achieve 10 mA cm À 2 and a small Tafel slope of 32 mV dec À 1 , obviously superior to the commercial IrO 2 and most previous reported catalysts. [34][35][36][37][38] The CoFeNi@CNTs also exhibit excellent OER stability with small current density decay after 12 h.…”

Section: Introductionmentioning

confidence: 98%

Trimetallic Nanoparticles Encapsulated into Bamboo‐Like N‐Doped Carbon Nanotubes as a Robust Catalyst for Efficient Oxygen Evolution Electrocatalysis

et al. 2020

ChemNanoMat

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High-efficiency oxygen evolution reaction (OER) electrocatalysts based on transition metal materials are one of the most promising alternatives, but their activity and durability are still far from desirable. Here, we report trimetallic N-doped carbon nanotubes with rapid electron transport and rapid diffusion of the electrolyte that can significantly enhance the OER. The introduction of a third metal can adjust the electronic structure, thereby causing favorable intermediate adsorption on the catalysts. The optimized catalyst CoFeNi@CNTs exhibits a low overpotential of 287 mV at 10 mA cm À 2 and a small Tafel slope of 32 mV dec À 1 , which are obviously superior to the precious catalyst IrO 2 and most previously reported catalysts. The CoFeNi@CNTs also exhibit excellent OER stability with small current density decay after 12 h. The outstanding OER activity is ascribed to the unique carbon nanotube structure and strong synergy between three metals.

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Mixed-Node Metal–Organic Frameworks as Efficient Electrocatalysts for Oxygen Evolution Reaction

Cited by 283 publications

References 43 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

Optimized Metal Chalcogenides for Boosting Water Splitting

Trimetallic Nanoparticles Encapsulated into Bamboo‐Like N‐Doped Carbon Nanotubes as a Robust Catalyst for Efficient Oxygen Evolution Electrocatalysis

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