Boron- and Nitrogen-Doped Graphene Quantum Dots/Graphene Hybrid Nanoplatelets as Efficient Electrocatalysts for Oxygen Reduction

Fei, Huilong; Ye, Ruquan; Ye, Gonglan; Gong, Yongji; Peng, Zhiwei; Fan, Xiujun; Samuel, Errol L. G.; Ajayan, Pulickel M.; Tour, James M.

doi:10.1021/nn504637y

Cited by 410 publications

(224 citation statements)

References 32 publications

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“…Typical examples include graphene quantum dots, N-doped porous carbons,c arbon nitrides,C NTs,c arbon nanofibers coupled with 1D (e.g.C NT,c arbon nanofiber), 2D (e.g.graphene), or 3D substrates (e.g.C MK-3). [221][222][223][224][225][226][227][228] Despite the tremendous efforts,a chieving seamless connection between the subunits in these coupled systems remains ah uge challenge.I nstead of physical mixing the asformed subunits,i ti sm ore feasible to construct the ORRactive component in the presence of or from the carbon substrate,which may generate astronger physical or chemical connection. Few-walled CNTs have been chosen for such investigations.…”

Section: Angewandte Chemiementioning

confidence: 99%

Earth‐Abundant Nanomaterials for Oxygen Reduction

et al. 2015

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Replacing the rare and precious platinum (Pt) electrocatalysts with earth-abundant materials for promoting the oxygen reduction reaction (ORR) at the cathode of fuel cells is of great interest in developing high-performance sustainable energy devices. However, the challenging issues associated with non-Pt materials are still their low intrinsic catalytic activity, limited active sites, and the poor mass transport properties. Recent advances in material sciences and nanotechnology enable rational design of new earth-abundant materials with optimized composition and fine nanostructure, providing new opportunities for enhancing ORR performance at the molecular level. This Review highlights recent breakthroughs in engineering nanocatalysts based on the earth-abundant materials for boosting ORR.

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Section: Angewandte Chemiementioning

confidence: 99%

Earth‐Abundant Nanomaterials for Oxygen Reduction

et al. 2015

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“…7 Up to date, research efforts have been mainly focused on doping non-metallic atoms like nitrogen, 8 sulphur, 7,9 chlorine, 10 fluorine 11 and selenium 12 into GQDs. Some works have also been reported for co-doped GQDs like B, N-doped GQDs, 13 N, S-doped GQDs, 14 and N, P-doped GQDs. 15 However, less studies have been carried out on metal-doping of GQDs.…”

Section: Introductionmentioning

confidence: 99%

Potassium doping: Tuning the optical properties of graphene quantum dots

Qian

Tang

et al. 2016

AIP Advances

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Doping with hetero-atoms is an effective way to tune the properties of graphene quantum dots (GQDs). Here, potassium-doped GQDs (K-GQDs) are synthesized by a one-pot hydrothermal treatment of sucrose and potassium hydroxide solution. Optical properties of the GQDs are altered as a result of K-doping. The absorption peaks exhibit a blue shift. Multiple photoluminescence (PL) peaks are observed as the excitation wavelength is varied from 380 nm to 620 nm. New energy levels are introduced into the K-GQDs and provide alternative electron transition pathways. The maximum PL intensity of the K-GQDs is obtained at an excitation wavelength of 480 nm which is distinct from the undoped GQDs (375 nm). The strong PL of the K-GQDs at the longer emission wavelengths is expected to make K-GQDs more suitable for bioimaging and optoelectronic applications.

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“…Various theoretical studies on band gap engineering using h-BN and graphene mixtures, [15][16][17][18][19][20][21][22][23] have revealed the tuneability of these materials through the mixture of atoms. Other studies have focused on exploiting this tuneability for catalysis of oxygen reduction reactions, [24][25][26][27][28][29][30][31][32][33] water transport, 34 and H 2 adsorption. [35][36][37] An important aspect to consider, if using graphene and h-BN based materials as catalysts, is their degree of selectivity.…”

Section: Introductionmentioning

confidence: 99%

Tuning dissociation using isoelectronically doped graphene and hexagonal boron nitride: Water and other small molecules

Al-Hamdani

Alfè

Lilienfeld

et al. 2016

The Journal of Chemical Physics

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Novel uses for 2-dimensional materials like graphene and hexagonal boron nitride (h-BN) are being frequently discovered especially for membrane and catalysis applications. Still however, a great deal remains to be understood about the interaction of environmentally and industrially relevant molecules such as water with these materials. Taking inspiration from advances in hybridising graphene and h-BN, we explore using density functional theory, the dissociation of water, hydrogen, methane, and methanol on graphene, h-BN, and their isoelectronic doped counterparts: BN doped graphene and C doped h-BN. We find that doped surfaces are considerably more reactive than their pristine counterparts and by comparing the reactivity of several small molecules, we develop a general framework for dissociative adsorption. From this a particularly attractive consequence of isoelectronic doping emerges: substrates can be doped to enhance their reactivity specifically towards either polar or non-polar adsorbates. As such, these substrates are potentially viable candidates for selective catalysts and membranes, with the implication that a range of tuneable materials can be designed. Published by AIP Publishing. [http://dx

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Boron- and Nitrogen-Doped Graphene Quantum Dots/Graphene Hybrid Nanoplatelets as Efficient Electrocatalysts for Oxygen Reduction

Cited by 410 publications

References 32 publications

Earth‐Abundant Nanomaterials for Oxygen Reduction

Earth‐Abundant Nanomaterials for Oxygen Reduction

Potassium doping: Tuning the optical properties of graphene quantum dots

Tuning dissociation using isoelectronically doped graphene and hexagonal boron nitride: Water and other small molecules

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