Improved Oxygen Reduction Performance of Pt–Ni Nanoparticles by Adhesion on Nitrogen-Doped Graphene

Gracia‐Espino, Eduardo; Jia, Xueen; Wågberg, Thomas

doi:10.1021/jp4101619

Cited by 69 publications

(58 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We propose that the intimate mixing is effectuated by that the dispersed N-dopant sites on the nanotubes function as effective anchoring points for the nanorods. [ 45,46 ] Moreover, at several locations it is observed that the N-CNTs penetrate through the nanorods (see also Figure S1, Supporting Information). Coupled with the fi rm attachment of the N-CNTs onto the CP substrate, it is clear that facile and stable charge-transport paths between the nanorods and the current collector are available.…”

Section: The Electrocatalyst Electrodementioning

confidence: 96%

Toward a Low‐Cost Artificial Leaf: Driving Carbon‐Based and Bifunctional Catalyst Electrodes with Solution‐Processed Perovskite Photovoltaics

Sharifi

Larsen

Wang

et al. 2016

Advanced Energy Materials

Self Cite

View full text Add to dashboard Cite

countries, where many users still are not connected to the electric grid, it is clear that alternative energy technologies are needed that can contribute with renewable fuels in signifi cant amounts. In this challenging context, researchers have found inspiration in the process of natural photosynthesis when they attempt to convert the plentiful, but intermittent, solar irradiation incident on the Earth's surface into a storable fuel, using a range of methods commonly coined as artifi cial photosynthesis. [1][2][3][4][5][6][7][8][9] One emerging technology to achieve such solar-to-fuel conversion is the "artifi cial-leaf device", which essentially comprises an assembly of photovoltaics (PVs) that drives two electrocatalyst electrodes immersed in water. [10][11][12] This device produces molecular hydrogen and oxygen using only sunlight and water as the input, and during the past few years its performance has improved drastically, with the current record for the solar-to-hydrogen (STH) conversion efficiency being above 10%. [13][14][15][16] It is, however, clear that in order to become truly sustainable and useful, the artifi cial-leaf device should comprise solely, or predominantly, earth-abundant materials and be produced with scalable and low-cost methods. Moreover, from a processing and transport point of view, it is preferable if it can be lightweight and fl exible.Perovskite materials [ 14,[17][18][19][20][21] have recently emerged as an interesting option to incumbent silicon [ 15,20 ] and copperindium-gallium-selenide [ 16,20 ] for the active material in PVs, due to a high and quickly improving solar-to-electric (STE) conversion effi ciency and an opportunity for cost-effi cient, solutionbased fabrication. [ 17,18,21,23 ] The electrocatalyst electrode comprises a catalytically active material deposited on the surface of a current collector. Commonly employed materials for the current collector are bulk or porous metals, [ 15 ] whereas a popular choice for the catalyst is various types of metal-oxides. [24][25][26][27][28][29][30][31][32][33][34][35][36][37][38] From a system-cost and practicality perspective, it is desirable to develop a functional lightweight and low-cost current collector and to identify a catalyst that is bifunctional in that it can drive the oxygen evolution reaction (OER) and the hydrogen evolution reaction (HER) in the same water solution. [ 14,[39][40][41][42][43][44] Here, we present an artifi cial-leaf device that delivers an STH effi ciency of 6.2% and a Faradaic H 2 evolution effi ciency of 100%. We mention that our device is not fully integrated at this stage, Molecular hydrogen can be generated renewably by water splitting with an "artifi cial-leaf device", which essentially comprises two electrocatalyst electrodes immersed in water and powered by photovoltaics. Ideally, this device should operate effi ciently and be fabricated with cost-effi cient means using earth-abundant materials. Here, a lightweight electrocatalyst electrode, comprising large surface-area NiCo 2 O 4 nano...

show abstract

Section: The Electrocatalyst Electrodementioning

confidence: 96%

Toward a Low‐Cost Artificial Leaf: Driving Carbon‐Based and Bifunctional Catalyst Electrodes with Solution‐Processed Perovskite Photovoltaics

Sharifi

Larsen

Wang

et al. 2016

Advanced Energy Materials

Self Cite

View full text Add to dashboard Cite

show abstract

“…The binding energy and relative stability of the supported clusters depend not just upon the composition but also upon how the cluster is adsorbed onto graphene, whether in the face-on configuration or the edgeon configuration. A PtNi cluster was also placed on non-defective graphene and nitrogen-doped graphene surfaces [569]. The PtNi cluster was obtained by replacing the two inner Pt layers from the octahedral Pt 44 nanoparticle by Ni atoms, resulting in a 1:1.2 Pt:Ni cluster.…”

Section: Platinum Clustersmentioning

confidence: 99%

“…Adapted from Ref. [569]. the electronic band structures of Pt/CNT systems are very sensitive to the small changes in the geometries of Pt clusters and chains [577].…”

Section: Platinum Clustersmentioning

confidence: 99%

Coordination chemistry on carbon surfaces

Axet¹,

Dechy‐Cabaret²,

Durand³

et al. 2016

Coordination Chemistry Reviews

106

View full text Add to dashboard Cite

“…Of particular interest from the point of view of reducing the amount of Pt in ORR catalyst materials are intermetallic core-shell nanocatalysts (IMCs) 216 , see Fig 12. In addition to the significant complexities in synthesising these materials, as well as organising their stable arrangement on a graphene surface, there will also be challenges in modeling these catalysts -see Gracia-Espino et al 243 for an example. Advances in synthetic strategies for shape-controlled catalytic metal NPs may also motivate more detailed quantum chemical studies of supported metal clusters in terms of predicting facet-specific reactivities for the ORR.…”

Section: Fuel Cellsmentioning

confidence: 99%

Computational chemistry for graphene-based energy applications: progress and challenges

Hughes

Walsh

2015

Nanoscale

View full text Add to dashboard Cite

Citation: Hughes ZE and Walsh TR (2015) Computational chemistry for graphene-based energy applications: progress and challenges. Nanoscale. 7: 6883-6908. Research in graphene-based energy materials is a rapidly growing area. Many graphene-based energy applications involve interfacial processes. To enable advances in the design of these energy materials, such that their operation, economy, efficiency and durability is at least comparable with fossil-fuel based alternatives, connections between the molecular-scale structure and function of these interfaces are needed. While it is experimentally challenging to resolve this interfacial structure, molecular simulation and computational chemistry can help bridge these gaps. In this Review, we summarise recent progress in the application of computational chemistry to graphene-based materials for fuel cells, batteries and photovoltaics. We also outline both the bright prospects and emerging challenges these techniques face for application to graphene-based energy materials in future.

show abstract

Improved Oxygen Reduction Performance of Pt–Ni Nanoparticles by Adhesion on Nitrogen-Doped Graphene

Cited by 69 publications

References 44 publications

Toward a Low‐Cost Artificial Leaf: Driving Carbon‐Based and Bifunctional Catalyst Electrodes with Solution‐Processed Perovskite Photovoltaics

Toward a Low‐Cost Artificial Leaf: Driving Carbon‐Based and Bifunctional Catalyst Electrodes with Solution‐Processed Perovskite Photovoltaics

Coordination chemistry on carbon surfaces

Computational chemistry for graphene-based energy applications: progress and challenges

Contact Info

Product

Resources

About