Enhanced electrocatalytic activity of Co@N-doped carbon nanotubes by ultrasmall defect-rich TiO2 nanoparticles for hydrogen evolution reaction

Yu, Jiayuan; Zhou, Weijia; Xiong, Tanli; Wang, Aili; Chen, Shaowei; Chu, Benli

doi:10.1007/s12274-017-1462-1

Cited by 72 publications

(31 citation statements)

References 44 publications

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“…Oxygen vacancy is thus far the most popular anion vacancy in the reported vacancy‐rich transition‐metal‐based electrocatalysts. Owing to the reducibility of MO (metaloxygen) bonds and low hopping barriers for oxygen vacancy, the preparation of oxygen‐deficient nanomaterials has been extensively reported to enhance the electrocatalysis performance . For instance, Co 3 O 4 , which is a typical spinel‐type oxide with mixed oxidation states of Co 2+ located at the tetrahedral site and Co 3+ occupied the octahedral site, has been demonstrated for facile formation of oxygen‐deficient structure by several groups .…”

Section: Classification Of Functional Vacanciesmentioning

confidence: 99%

Noble Metal‐Free Nanocatalysts with Vacancies for Electrochemical Water Splitting

Yang

Wang

et al. 2018

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The fast development of nanoscience and nanotechnology has significantly advanced the fabrication of nanocatalysts and the in-depth study of the structural-activity characteristics of materials at the atomic level. Vacancies, as typical atomic defects or imperfections that widely exist in solid materials, are demonstrated to effectively modulate the physicochemical, electronic, and catalytic properties of nanomaterials, which is a key concept and hot research topic in nanochemistry and nanocatalysis. The recent experimental and theoretical progresses achieved in the preparation and application of vacancy-rich nanocatalysts for electrochemical water splitting are explored. Engineering of vacancies has shown to open up a new avenue beyond the traditional morphology, size, and composition modifications for the development of nonprecious electrocatalysts toward efficient energy conversion. First, an introduction followed by discussions of different types of vacancies, the approaches to create vacancies, and the advanced techniques widely used to characterize these vacancies are presented. Importantly, the correlations between the vacancies and activities of the vacancy-rich electrocatalysts via tuning the electronic states, active sites, and kinetic energy barriers are reviewed. Finally, perspectives on the existing challenges along with some opportunities for the further development of vacancy-rich noble metal-free electrocatalysts with high performance are discussed.

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Section: Classification Of Functional Vacanciesmentioning

confidence: 99%

Noble Metal‐Free Nanocatalysts with Vacancies for Electrochemical Water Splitting

Yang

Wang

et al. 2018

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275

186

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“…According to the above results, a probable morphology and defect regulation mechanism is suggested for the CVD‐supported precursor pyrolysis approach. In the CVD process, DCA (C 2 H 4 N 4 ) will be evolved gradually, accompanying with the release of N−H and C−N fragments . Among them, C−N fragments serve as carbon sources for carbon matrix growth and as nitrogen sources for nitrogen‐doping reactions, and chemical active N−H fragments can facilitate the dispersion of Co species and N‐doping reactions .…”

Section: Resultsmentioning

confidence: 99%

“…exhibit promoted active toward HER, [27,28] OER and ORR. [29,30] More importantly, interfacial CoÀ NÀ C coupling bonds forming at the interfaces between Cobased nanoparticles (including Co metal, Co-based alloys and compounds) and N-doped carbon supporters are widely recognized as remarkable electrocatalytically active centers via modulating electronic distribution, lowering kinetic energy barriers for favorably adsorbing intermediates, thus granting striking electrocatalytic performances toward HER, [31][32][33] ORR [34] and OER. [35] [a] Dr.…”

mentioning

confidence: 99%

Cobalt‐Embedded N‐Doped Carbon Arrays Derived In Situ as Trifunctional Catalyst Toward Hydrogen and Oxygen Evolution, and Oxygen Reduction

et al. 2019

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The carbons containing metals coordinated with nitrogen are emerging as the most promising catalysts toward various heterogeneous catalyses. In this paper, such a carbon catalyst is prepared through a chemical vapor deposition (CVD)‐supported precursor pyrolysis. Compared with the direct pyrolysis of polypyrrole@cobalt salt precursor, the incorporation of dicyanodiamide as the CVD source facilitates the diversification and hierarchization of carbon morphology, the reduction of Co particle size, and the increase of the proportion of interfacial Co−N−C and pyridinic‐N. The catalyst is composed of in‐situ‐grown multiple‐morphology carbons (MMCs) with metallic Co particles embedded, where the MMCs are a combination of nano‐particles, ‐rods, and ‐wires, all comprised by small N‐doped carbon nanoflakes. Owing to the combined modulation on morphology configurations and defect states, the Co/MMCs catalyst demonstrates excellent activities toward hydrogen evolution reaction (HER), oxygen evolution reaction (OER), and oxygen reduction reaction (ORR). A half‐wave potential of 0.84 V and low overpotentials of 86 and 180 mV at 10 mA cm−2 current density for HER and OER are achieved, respectively. Additionally, the catalyst also demonstrates favorable prospects for large‐scale applications in overall water splitting and Zn‐air battery.

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“…The introduction of a conformal titania monolayer coating of SBA-15 improved the dispersion of silver nanoparticles, corresponding bulk and surface carbonate content, and hence ionic silver release kinetics. This observation likely reflects the ability of defective reducible metal oxides to act as nucleation centers for metals [38,39,40], thereby increasing the density of small nanoparticles, and amphoteric nature of titania and ability to capture atmospheric CO 2 [41] which can subsequently react with (weakly basic) silver oxides [42,43] at the nanoparticle interface. Additional rate enhancements for ionic silver were observed for hierarchical microporous-mesoporous SBA-15 frameworks, presumably due to their stabilization of even smaller silver nanoparticles and hence higher carbonate concentrations.…”

Section: Discussionmentioning

confidence: 99%

Tunable Silver-Functionalized Porous Frameworks for Antibacterial Applications

et al. 2018

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Healthcare-associated infections and the rise of drug-resistant bacteria pose significant challenges to existing antibiotic therapies. Silver nanocomposites are a promising solution to the current crisis, however their therapeutic application requires improved understanding of underpinning structure-function relationships. A family of chemically and structurally modified mesoporous SBA-15 silicas were synthesized as porous host matrices to tune the physicochemical properties of silver nanoparticles. Physicochemical characterization by transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), X-ray absorption near-edge spectroscopy (XANES) and porosimetry demonstrate that functionalization by a titania monolayer and the incorporation of macroporosity both increase silver nanoparticle dispersion throughout the silica matrix, thereby promoting Ag2CO3 formation and the release of ionic silver in simulated tissue fluid. The Ag2CO3 concentration within functionalized porous architectures is a strong predictor for antibacterial efficacy against a broad spectrum of pathogens, including C. difficile and methicillin-resistant Staphylococcus aureus (MRSA).

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Enhanced electrocatalytic activity of Co@N-doped carbon nanotubes by ultrasmall defect-rich TiO2 nanoparticles for hydrogen evolution reaction

Cited by 72 publications

References 44 publications

Noble Metal‐Free Nanocatalysts with Vacancies for Electrochemical Water Splitting

Noble Metal‐Free Nanocatalysts with Vacancies for Electrochemical Water Splitting

Cobalt‐Embedded N‐Doped Carbon Arrays Derived In Situ as Trifunctional Catalyst Toward Hydrogen and Oxygen Evolution, and Oxygen Reduction

Tunable Silver-Functionalized Porous Frameworks for Antibacterial Applications

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