Nitrogen‐Doped Carbon Nanotube Confined Co–N<i><sub>x</sub></i> Sites for Selective Hydrogenation of Biomass‐Derived Compounds

Gong, Wanbing; Lin, Yue; Chen, Chun; Al‐Mamun, Mohammad; Lu, Hai-Sheng; Wang, Guozhong; Zhang, Haimin; Zhao, Huijun

doi:10.1002/adma.201808341

Cited by 149 publications

(96 citation statements)

References 29 publications

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“…The nearly absent appearance of a pre-edge feature (arisen from the forbidden 1s-to-3d transition) at~7709 eV in the CoN@CNTs indicates a symmetric coordination environment of Co, e.g., Co-N 4 32 . Notably, the Fourier transformed (FT) Co K-edge EXAFS spectra exhibit the signal of light scattering nearest neighbors at~1.5 Å, corresponding to the Co-N/C scattering pair 33,34 and further corroborating the existence of tetrahedrally coordinated Co (e.g., Co-N 4 ) 35,36 as revealed by fitting analysis (Supplementary Table 1). The weak signals originated from the Co-Co scattering path in a metallic feature might be ascribed to the rare appearance of Co nanoparticles.…”

Section: Resultsmentioning

confidence: 54%

Direct insights into the role of epoxy groups on cobalt sites for acidic H2O2 production

et al. 2020

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Hydrogen peroxide produced by electrochemical oxygen reduction reaction provides a potentially cost effective and energy efficient alternative to the industrial anthraquinone process. In this study, we demonstrate that by modulating the oxygen functional groups near the atomically dispersed cobalt sites with proper electrochemical/chemical treatments, a highly active and selective oxygen reduction process for hydrogen peroxide production can be obtained in acidic electrolyte, showing a negligible amount of onset overpotential and nearly 100% selectivity within a wide range of applied potentials. Combined spectroscopic results reveal that the exceptionally enhanced performance of hydrogen peroxide generation originates from the presence of epoxy groups near the CoN 4 centers, which has resulted in the modification of the electronic structure of the cobalt atoms. Computational modeling demonstrates these electronically modified cobalt atoms will enhance the hydrogen peroxide productivity during oxygen reduction reaction in acid, providing insights into the design of electroactive materials for effective peroxide production.

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Section: Resultsmentioning

confidence: 54%

Direct insights into the role of epoxy groups on cobalt sites for acidic H2O2 production

et al. 2020

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“…Third, given that some biological systems present interesting properties themselves, the direct use of such biomaterials in functional devices would be an eco‐friendly and efficient way to develop bioinspired technologies. Recently, researchers discovered that biological materials directly derived from natural species exhibited outstanding performances in various energy applications such as photocatalysis, electrocatalysis, and biomass conversion . However, the precise and advanced biotechnology required in this route turns to be another major challenge.…”

Section: Discussionmentioning

confidence: 99%

Bioinspired 2D Nanomaterials for Sustainable Applications

et al. 2019

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opens new doors for innovation in materials and sustainable technologies. Owing to the great diversity and complexity of nature, the well-evolved natural structures corresponding to specific functionalities may vary from 1D nanofibers or nanoneedles to 2D nanosheets or nanoplates or even 3D multiscale-ordered structures. [32] A good understanding of the structureproperty relationships is essential for the design and fabrication of bioinspired nanomaterials.2D nanomaterials have achieved some significant triumphs in various applications, benefitting from their unique structural characteristics and relevant chemical and physical properties. [33][34][35] In fact, 2D nanostructures also widely exist in nature and generate some amazing functionalities, which offers us great opportunities to further expand the design and fabrication of 2D nanostructured materials, devices, and technologies. [36] By integrating 2D nanomaterials with the bioinspired strategies, innovative materials and technologies have been proposed and realized. In this research news, recent progress that mainly achieved over the past decade in bioinspired materials and technologies based on 2D nanomaterials for targeted sustainable energy and environmental technologies, such as energy conversion and storages, environmental remediation, etc., is reviewed and discussed. As shown in Figure 1, three topical subjects, including bioinspired 2D photonic structures, bioinspired 2D energy nanomaterials, and bioinspired 2D superwetting materials, along with the challenges and opportunities will be the focus of this article, and give an overall perspective to this emerging and promising research area. Bioinspired 2D Photonic MaterialsTo survive in the wild world, natural species have evolved various unique structures with fascinating optical functionalities, such as glitzy structural colors for attracting prey or mates, [37] tunable camouflage colors for escaping from predators, [38] antireflection function of compound eyes for weak light vision, [36] and so on. These structures, as known as photonic crystal structures, have inspired the design of novel photonic micro/nanostructures and some smart optical devices.Among the various natural photonic structures, one class consists of periodically stacked 2D multilayers, also known as Bragg Stacks, have been found in many natural organisms, such as plants, insects, and marine benthos. [39] Multiple pairs of 2D layers with different refractive indexes in Bragg Stacks can generate iridescent structural colors through constructive The increasing demand for constructing ecological civilization and promoting socially sustainable development has encouraged scientists to develop bioinspired materials with required properties and functions. By bringing science and nature together, plenty of novel materials with extraordinary properties can be created by learning the best from natural species. In combination with the exceptional features of 2D nanomaterials, bioinspired 2D nanomaterials and technologies have delivered signif...

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“…In a recent study, Gong et al demonstrated laser-mediated regulation of metal single-atom sites ( Figures 4M-4Q). 65 First, the carbon nanopolyhedrons made of CNTs ( Figures 4M and 4N) with abundant Co single-atom sites were prepared by a facile pyrolysis method, 72 via which a large number of these sites were deeply confined within the CNTs. The existence of Co single-atom sites is confirmed by the AC-STEM observation ( Figure 4N) and Co K-edge X-ray absorption near-edge structure (XANES) spectra ( Figure 4Q).…”

Section: Reviewmentioning

confidence: 99%

Laser Irradiation of Electrode Materials for Energy Storage and Conversion

et al. 2020

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In addition to its traditional use, laser irradiation has found extended application in controlled manipulation of electrode materials for electrochemical energy storage and conversion, which are primarily enabled by the laser-driven rapid, selective, and programmable materials processing at low thermal budgets. In this Review, we summarize the recent progress of laser-mediated engineering of electrode materials, with special emphases on its capability of controlled introduction of structural defects, precise fabrication of heterostructures, and elaborate construction of integrated electrode architecturesall of which are highly desired for many electrochemical processes, yet difficult to be precisely synthesized via conventional technologies. After a brief introduction of the fundamental mechanism of laser processing, its practical use for structural regulation of electrode materials is discussed in detail. The application of these laserenabled materials for supercapacitors, rechargeable batteries, and some fundamental electrocatalytic reactions enabling energy conversion is then summarized. Finally, we highlight the challenges faced at the current stage, aiming to shed some light on the future development of this prosperous field.

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Nitrogen‐Doped Carbon Nanotube Confined Co–N_x Sites for Selective Hydrogenation of Biomass‐Derived Compounds

Cited by 149 publications

References 29 publications

Direct insights into the role of epoxy groups on cobalt sites for acidic H2O2 production

Direct insights into the role of epoxy groups on cobalt sites for acidic H2O2 production

Bioinspired 2D Nanomaterials for Sustainable Applications

Laser Irradiation of Electrode Materials for Energy Storage and Conversion

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Nitrogen‐Doped Carbon Nanotube Confined Co–Nx Sites for Selective Hydrogenation of Biomass‐Derived Compounds

Cited by 149 publications

References 29 publications

Direct insights into the role of epoxy groups on cobalt sites for acidic H2O2 production

Direct insights into the role of epoxy groups on cobalt sites for acidic H2O2 production

Bioinspired 2D Nanomaterials for Sustainable Applications

Laser Irradiation of Electrode Materials for Energy Storage and Conversion

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Product

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Nitrogen‐Doped Carbon Nanotube Confined Co–N_x Sites for Selective Hydrogenation of Biomass‐Derived Compounds