A Microribbon Hybrid Structure of CoOx‐MoC Encapsulated in N‐Doped Carbon Nanowire Derived from MOF as Efficient Oxygen Evolution Electrocatalysts

Tan, Huachun; Chen, Yu; Lee, Jongmin

doi:10.1002/smll.201702753

Cited by 74 publications

(23 citation statements)

References 57 publications

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“…Metal–organic frameworks (MOFs), as a new type of promising materials in electrochemistry, are well investigated by researchers in recent years . Due to the poor conductivity of MOFs, strategies are developed to increase the conductivity and improve the electrochemical performance, such as doping different elements (both metals and nonmetals), incorporating conductive materials (such as graphene), encapsulating active molecules, and even undergoing calcination or pyrolysis …”

Section: Methodsmentioning

confidence: 99%

π‐Conjugated Molecule Boosts Metal–Organic Frameworks as Efficient Oxygen Evolution Reaction Catalysts

Zhu

Ding

et al. 2018

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Metal-organic frameworks (MOFs), as a new type of promising materials in electrochemistry, are well investigated by researchers in recent years. [17][18][19][20] Due to the poor conductivity of MOFs, strategies are developed to increase the conductivity and improve the electrochemical performance, such as doping different elements (both metals and nonmetals), [21,22] incorporating conductive materials (such as graphene), [23,24] encapsulating active molecules, [25,26] and even undergoing calcination [27,28] or pyrolysis. [29][30][31] Zeolitic imidazolate frameworks (ZIFs), [32,33] as a new subfamily of MOFs, exhibit not only crystalline multiporosity as MOFs but also high thermal and chemical stability as zeolites. Attributed to the outstanding properties, ZIF derivatives are unique potential candidates in diversified applications such as chemical separation, [34,35] sensors, [36][37][38] energy storage, [39,40] and catalysis. [41,42] π-Conjugated molecules are used to construct planar conductive MOFs in recent years due to the high charge mobility and the corresponding MOFs are explored as good electrocatalysts, [43] electrode materials, [44] sensors, [45] and so on. In our study, a simple MOF architecture, named ZIF-67, was used as the raw material to prepare a high-performance catalyst for OER. The organic molecule HHTP (2,3,6,7,10,11-hexahydroxytriphenylene) was coated on ZIF-67 via a facile one-step hydrothermal method and the obtained composite, denoted as HHTP@ZIF-67, presented higher electrocatalytic efficiency and durability than many reported MOF materials. To the best of our knowledge, this is the first time that a π-conjugated molecule was coated directly on MOFs to ameliorate their electrochemical capabilities. This work will shed light on the further application of MOFs as promising electrocatalysts in energy storage and conversion.ZIF-67 was synthesized according to the previous work by Dong and co-workers [46] and utilized to prepare our porous electrocatalysts. The composite HHTP@ZIF-67 was successfully obtained after combining ZIF-67 together with HHTP under different solvothermal conditions (40, 60, 80, and 100 °C). The synthesis route is presented in Scheme 1.Since the as-prepared sample under 60 °C manifests the most uniform in both size and surface morphology that can be visualized in Figure S1 (Supporting Information), the following characterizations and discussions are focused on HHTP@ZIF-67 obtained under 60 °C when comparing with the pristine ZIF-67.To improve the efficiency of water electrolysis, developing efficient oxygen evolution reaction (OER) electrocatalysis is extremely important due to its four-electron transfer dynamics. In this work, a π-conjugated molecule (2,3,6,7,10,11-hexahydroxytriphenylene, HHTP), which can accelerate the electron transfer, is coated directly on pristine ZIF-67, resulting in a composite named HHTP@ZIF-67, via a simple one-step solvothermal method. The obtained HHTP@ZIF-67 possesses a Brunauer-Emmett-Teller surface area of 2013.9 m 2 g −1 and displays m...

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Section: Methodsmentioning

confidence: 99%

π‐Conjugated Molecule Boosts Metal–Organic Frameworks as Efficient Oxygen Evolution Reaction Catalysts

Zhu

Ding

et al. 2018

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105

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“…However, their wide use for industrial‐scale water splitting is not practical due to their high cost and scarcity . Hence, numerous endeavors had been devoted to the preparation of high‐performance and low‐cost noble‐metal‐free electrocatalysts in alkaline electrolytes, such as the transition‐metal sulfides, phosphides, carbides, borides . Among them, Ni 2 P, which features good electrical conductivity, high stability over a wide pH range, and high elemental abundance of both Ni and P, has been experimentally and theoretically demonstrated as an attractive OER and HER catalyst.…”

Section: Introductionmentioning

confidence: 99%

Bifunctional Hybrid Ni/Ni₂P Nanoparticles Encapsulated by Graphitic Carbon Supported with N, S Modified 3D Carbon Framework for Highly Efficient Overall Water Splitting

Sun

Zhang

et al. 2018

Adv Materials Inter

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electrode reaction, drawing numerous efforts and attention. [6][7][8][9][10] However, the industrialization application of overall water electrolysis is yet greatly limited since the high-active and abundant electrocatalysts with low overpotential for both HER and OER are scanty. [11][12][13][14] Thus, the development of efficient bifunctional electrocatalysts with excellent performance and low overpotential for overall water electrolysis is imperative. Currently, Pt-and Ru-based noble-metal catalysts are the state-of-the-art electrocatalysts for HER and OER process. [15][16][17] However, their wide use for industrial-scale water splitting is not practical due to their high cost and scarcity. [18,19] Hence, numerous endeavors had been devoted to the preparation of high-performance and low-cost noblemetal-free electrocatalysts in alkaline electrolytes, such as the transition-metal sulfides, [20][21][22] phosphides, [23][24][25] carbides, [26][27][28] borides. [29,30] Among them, Ni 2 P, which features good electrical conductivity, high stability over a wide pH range, and high elemental abundance of both Ni and P, has been experimentally and theoretically demonstrated as an attractive OER and HER catalyst. However, the real active species of Ni 2 Pbased materials remain elusive. In addition, the HER and OER performance of the reported Ni 2 P is often not comparable with that of the Pt/RuO 2 couple, limiting its practical application in water electrolysis. [31][32][33][34][35] Additionally, some bifunctional electrocatalysts, such as hybrid transition metal/transition metal phosphide nanoparticles, demonstrated gratifying bifunctional HER and OER performance. [35,36] Besides the efficient Mott-Schottky electrocatalysts, various heteroatoms doped or graphitic carbon encapsulated particles show high catalytic performance for energy application. [37][38][39][40][41][42][43] However, the usually used carbon nanomaterials are generally pulverous and need to be engineered into electrodes via polymer binders. But the use of binders reduces the configuration conductivity, blocks direct contact between the electrolyte and reaction site, leading to lower catalytic activity. However, if the high-quality porous carbon framework with direct attachment of catalysts could be achieved, above problems might be resolved. Additionally, the doping of heteroatoms, such as nitrogen, sulfur doping into the carbon networks, could be able to enhance oxygen adsorption and reactivity, which had been verified in the previous reports The novel hybrid Ni/Ni 2 P nanoparticles with graphitic carbon coating supported by 3D N, S dual modified binder-free macroporous carbon framework (Ni/ Ni 2 P@3DNSC) are reported as an efficient bifunctional electrocatalysts for the production of hydrogen and oxygen. The obtained Ni/Ni 2 P@3DNSC electrode exhibits an excellent catalytic activity with a low overpotential of 231 mV for oxygen evolution reaction (OER) and 92 mV for hydrogen evolution reaction (HER) due to the strong coupled interface of Ni and Ni 2 P,...

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“…The sample also showed an obvious photo response to visible light irradiation and lowered onset potential, which was probably associated with the semiconducting characteristics of the spin‐polarized CoO and the quantum confinement effect of the nanoparticles. Likewise, CoO x –MoC heterostructures with nitrogen‐doped carbon encapsulated in them were reported as high‐performance oxygen evolution electrocatalysts . The formation process is shown in Figure a.…”

Section: Electrocatalytic Reactionsmentioning

confidence: 99%

Applications of Metal–Organic‐Framework‐Derived Carbon Materials

et al. 2018

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production, especially for hydroelectricity, sunlight, and wind energy, which cannot be gathered or released when they are needed. [5][6][7][8] Electrochemical energy storage devices provide a promising approach for the storage of electric energy from these sources. [9][10][11] Currently, carbonaceous materials have attracted much interest for their extensive applications including adsorption, [12] catalysis, [13] batteries, [14] fuel cells, [15,16] supercapacitors, [17,18] and drug delivery and imaging. [19] In addition, some sensors are also one of the important applications of carbonaceous materials, because they are closely related to human health. [20,21] For instance, Emran and co-workers [22] constructed ultrasensitive biosensors with N-doped mesoporous carbon (NMC)-based electrodes for in vitro monitoring of DA released from living cells. With the further study of the experiment, they also designed a series of S-doped carbon materials for a wider detection of DA, UA (uric acid), and AA (ascorbic acid). [23,24] The advantages of easy preparing, nontoxic and excellent electrical conductivity of carbonaceous materials, which are rare among energy storage materials, make carbonaceous materials superior to most of the energy storage materials. [25][26][27] There are varieties of approaches for the preparation of carbon materials, such as directly carbonizing from organic precursors, physically or chemically carbonizing from carbon, template methods using zeolites and mesoporous silica, solvothermal and hydrothermal methods with elevated temperature, the electrical arc methods, and chemical vapor decomposition (CVD) methods. [28][29][30][31][32][33][34] Among all these approaches, directly carbonizing from organic precursors is the most frequently used method to prepare nanoporous carbons (NPCs) due to its flexibility and simplicity. [35][36][37] However, these NPC materials present certain drawbacks, such as low surface areas, disordered structures, and ununiformed sizes, which will greatly limit their applications. [25] As studies have progressed, researchers found that carbon materials derived from metalorganic frameworks (MOFs) could overcome these limitations.Metal-organic frameworks, which are also named porous coordination polymers (PCPs), are crystalline porous materials with periodic network structures formed by metal ions (or metal clusters) and organic ligands. [38][39][40][41][42] They are usually prepared by solvothermal methods and used as precursors or templates to form nanostructured materials. [43][44][45] So far, many researchers have highlighted the advantages of MOFs. For Carbon materials derived from metal-organic frameworks (MOFs) have attracted much attention in the field of scientific research in recent years because of their advantages of excellent electron conductivity, high porosity, and diverse applications. Tremendous efforts are devoted to improving their chemical and physical properties, including optimizing the morphology and structure of the carbon materials, compositing them wi...

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A Microribbon Hybrid Structure of CoOx‐MoC Encapsulated in N‐Doped Carbon Nanowire Derived from MOF as Efficient Oxygen Evolution Electrocatalysts

Cited by 74 publications

References 57 publications

π‐Conjugated Molecule Boosts Metal–Organic Frameworks as Efficient Oxygen Evolution Reaction Catalysts

π‐Conjugated Molecule Boosts Metal–Organic Frameworks as Efficient Oxygen Evolution Reaction Catalysts

Bifunctional Hybrid Ni/Ni₂P Nanoparticles Encapsulated by Graphitic Carbon Supported with N, S Modified 3D Carbon Framework for Highly Efficient Overall Water Splitting

Applications of Metal–Organic‐Framework‐Derived Carbon Materials

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A Microribbon Hybrid Structure of CoOx‐MoC Encapsulated in N‐Doped Carbon Nanowire Derived from MOF as Efficient Oxygen Evolution Electrocatalysts

Cited by 74 publications

References 57 publications

π‐Conjugated Molecule Boosts Metal–Organic Frameworks as Efficient Oxygen Evolution Reaction Catalysts

π‐Conjugated Molecule Boosts Metal–Organic Frameworks as Efficient Oxygen Evolution Reaction Catalysts

Bifunctional Hybrid Ni/Ni2P Nanoparticles Encapsulated by Graphitic Carbon Supported with N, S Modified 3D Carbon Framework for Highly Efficient Overall Water Splitting

Applications of Metal–Organic‐Framework‐Derived Carbon Materials

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Bifunctional Hybrid Ni/Ni₂P Nanoparticles Encapsulated by Graphitic Carbon Supported with N, S Modified 3D Carbon Framework for Highly Efficient Overall Water Splitting