Metal‐Organic Framework‐Derived Honeycomb‐Like Open Porous Nanostructures as Precious‐Metal‐Free Catalysts for Highly Efficient Oxygen Electroreduction

Zhu, Qi‐Long; Xia, Wei; Akita, Tomoki; Zou, Ruqiang; Xu, Qiang

doi:10.1002/adma.201600979

Cited by 426 publications

(212 citation statements)

References 59 publications

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“…The exact content of N in cal-CoZIF-VXC72 determined by element analysis was approximately 0.44 wt%. [3][4][5][6][7][8] However, according to our XPS results, only peaks of C and O were clearly observed, and no other effective doping could be inferred in the cal-CoZIF (Figure 3a,b; Figure S7, Supporting Information). From the TEM images ( Figure S5b After calcination, the XRD peaks of ZIF-67 disappeared, and only a small peak ((311) facets) of Co 3 O 4 (JCPDS card number: 65-3103) was observed.…”

Section: Carbon Materialsmentioning

confidence: 97%

“…The pyrolysis of such materials could also contribute to good electrochemical activities. Recently, MOF derivatives have been widely researched in the oxygen reduction reaction (ORR) in alkali solutions [3][4][5][6][7][8] to benefit the hydroxide exchange membrane fuel cell (HEMFC), which is a promising alternative technology to the proton exchange membrane fuel cell due to the virtue of cheap and stable platinum-group-metal-free ORR catalysts. Carbon black is a cheap industrial product that has versatile functions as an additive in plastics, rubbers, pigments, cables, and cells because of its structures and conductivities.…”

mentioning

confidence: 99%

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Modifying Commercial Carbon with Trace Amounts of ZIF to Prepare Derivatives with Superior ORR Activities

Chen

et al. 2017

Advanced Materials

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Reducing costs while maintaining high activities and stabilities of oxygen reduction reaction (ORR) catalysts has long been pursued for applications to membrane fuel cells. Here, an absorption-reaction method is used to prepare a zeolitic imidazolate framework coated commercial carbon, and the pyrolysis of such material brings about impressive ORR activities and stabilities with large diffusion-limited current density, half-wave potential, and no obvious decay after 10 000 cyclic voltammetry cycles, which is even better than that of the commercial Pt/C catalysts. The absorption-reaction method is realized by simply soaking the commercial carbon black sequentially in Co(NO ) and 2-methylimidazole solutions at ambient conditions. The detailed analysis on such carbon materials reveals that both Co and N are essential to activities, even the amount of N and Co species is very low. The reduction of raw materials and simplified handling procedures result in well-controlled costs in applications.

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Section: Carbon Materialsmentioning

confidence: 97%

mentioning

confidence: 99%

Modifying Commercial Carbon with Trace Amounts of ZIF to Prepare Derivatives with Superior ORR Activities

Chen

et al. 2017

Advanced Materials

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“…In another study, Zhu et al reported the synthesis of N and S dual-doped honeycomb-like porous carbons with Co 9 S 8 NPs (denoted Co 9 S 8 @CNST; where T is the pyrolysis temperature), in which MIL-101-NH 2 was employed as the MOF framework, and thiourea and CoCl 2 were introduced as secondary precursors in the MOF via a chemical impregnation approach. [99] …”

Section: Transition Metal Compounds Compositionmentioning

confidence: 99%

“…[97] Another applicable approach for incorporating transition metal compounds into MOF-derived composites involves the chemical decoration of MOF-derived porous carbons, in which target chemicals are implanted in the MOF precursors or MOFderived carbon substrates by an impregnation method. [48,99] This strategy can not only make full use of the electrochemical properties of integrated active compounds, but also exploits the unique characteristics of MOF-derived carbons, including high surface area, uniform porosity, good conductivity, and welldefined structure. For example, Liu et al prepared a MoS 2 -based 3D nanoporous composite (MoS 2 /3D-NPC).…”

Section: Transition Metal Compounds Compositionmentioning

confidence: 99%

“…As an important alternative to Pt catalysts, MOF-derived materials exhibit remarkable ORR performance in terms of activity, durability, and tolerance to methanol. [24,[32][33][34][38][39][40][41][42][43][44]47,53,[58][59][60][61][62][63][65][66][67][68][69][70][71][72][73][75][76][77]81,83,97,99,[107][108][109] In particular, some newly developed MOF derivatives achieved highly improved activity that is comparable and even superior to Pt catalysts under identical experimental conditions. Table 1 summarizes the catalytic performances of representative MOF-derived electrocatalysts for the ORR.…”

Section: Orrmentioning

confidence: 99%

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Design Strategies toward Advanced MOF‐Derived Electrocatalysts for Energy‐Conversion Reactions

Liu

Zhu

Guo

et al. 2017

Advanced Energy Materials

598

351

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great potential to meet our ever-growing demand for energy. These devices appear most promising due to their high energyconversion and storage efficiencies, portability, which can mitigate the intermittent distribution of the aforementioned energy in space and time, and environmental benignancy. [6][7][8][9][10] Fundamentally, these electrochemical systems or devices involve different energy-conversion reactions, such as the oxygen reduction reaction (ORR), oxygen evolution reaction (OER), hydrogen evolution reaction (HER) and electrochemical CO 2 reduction (ECR), which provide energy by directly converting chemical energy (e.g., methanol, ethanol, zinc, and hydrogen) into electrical energy, or store energy vice versa. [6][7][8][9][10][11][12] The intrinsically sluggish kinetics of these reactions highlights the critical role of electrocatalysts. In this regard, the development of advanced electrocatalysts has always been the technological bottleneck that hinders the practical applications of these energy techniques at any appreciable scale. [7][8][9][10][11][12] Currently, noble-metal-based materials (e.g., Pt, IrO 2 , RuO 2 , and Au) are considered to be state-of-the-art catalysts for a variety of energy devices, [13][14][15][16] such as proton exchange membrane fuel cells (PEMFCs). [13] In spite of their outstanding catalytic performance for many electrochemical reactions, the high cost and scarcity of these noble metals severely hamper their large-scale commercialization. [17] Further, precious metal catalysts face issues with poisoning when exposed to a range of chemical compounds like methaol and carbon monoxide, leading to significant activity loss. [18] Therefore, extensive studies have focused on the development of alternative electrocatalysts with high activity, long stability, low cost, widespread availability, and facile synthesis. [8][9][10]19,20] To replace precious-metal-based catalysts, a wide range of non-noble-metal materials, especially transition-metal-based materials and metal-free carbon materials, have been intensively investigated as electrocatalysts for different applications. [21] Most of these electrocatalyst candidates show great promise in energy-conversion reactions. Nevertheless, very few alternative materials have yet to achieve superior electrochemical properties to those of noble-metal-based catalysts. Fortunately, the accumulation of experimental and theoretical studies have significantly advanced our knowledge on the chemical and physical nature of various candidate materials. [10][11][12] For example, our group has shed light on the activity origin of The key challenge to developing renewable and clean energy technologies lies in the rational design and synthesis of efficient and earth-abundant catalysts for a wide variety of electrochemical reactions. This review presents materials design strategies for constructing improved electrocatalysts based on MOF precursors/templates, with special emphasis on component manipulation, morphology control, and structure engineering. G...

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A Polymetallic Metal‐Organic Framework‐Derived Strategy toward Synergistically Multidoped Metal Oxide Electrodes with Ultralong Cycle Life and High Volumetric Capacity

Niu

Wang

Zhou

et al. 2016

Adv Funct Materials

121

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Metal‐organic frameworks (MOFs) are very convenient self‐templated precursors toward functional materials with tunable functionalities. Although a huge family of MOFs has been discovered, conventional MOF‐derived strategies are largely limited to the sole MOF source based on a handful of the metal elements. The limitation in structure and functionalities greatly restrains the maximum performance of MOF‐based materials for fulfilling the practical potential. This study reports a polymetallic MOF‐derived strategy for easy synthesis of metal‐oxide‐based nanohybrids with precisely tailored multicomponent active dopants. A variety of MoO2‐based nanohybrids with synergistical co‐doping of W, Cu, and P are yielded by controlled pyrolysis of tailor‐made polymetallic MOFs. The W doping induces the formation of MoxW1−xO2 solid solution with better activity. The homogeneous dispersion of Cu nanocrystallites in robust P‐doped carbon skeleton creates a conductive network for fast charge transfer. Boosting by synergistically multidoping effect, the Mo0.8W0.2O2‐Cu@P‐doped carbon nanohybrids with optimized composition exhibit exceptionally long cycle life of 2000 cycles with high capacities but very slow capacity loss (0.043% per cycle), as well as high power output for lithium storage. Remarkably, the co‐doping of heavy W and Cu elements in MoO2 with high density makes them particularly suitable for high volumetric lithium storage.

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Metal‐Organic Framework‐Derived Honeycomb‐Like Open Porous Nanostructures as Precious‐Metal‐Free Catalysts for Highly Efficient Oxygen Electroreduction

Cited by 426 publications

References 59 publications

Modifying Commercial Carbon with Trace Amounts of ZIF to Prepare Derivatives with Superior ORR Activities

Modifying Commercial Carbon with Trace Amounts of ZIF to Prepare Derivatives with Superior ORR Activities

Design Strategies toward Advanced MOF‐Derived Electrocatalysts for Energy‐Conversion Reactions

A Polymetallic Metal‐Organic Framework‐Derived Strategy toward Synergistically Multidoped Metal Oxide Electrodes with Ultralong Cycle Life and High Volumetric Capacity

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