A highly efficient transition metal nitride-based electrocatalyst for oxygen reduction reaction: TiN on a CNT–graphene hybrid support

Youn, Duck Hyun; Bae, Ganghong; Han, Seung-Jin; Kim, Jae Young; Jang, Ji‐Wook; Park, Hunmin; Choi, Sun Hee; Lee, Jae Sung

doi:10.1039/c3ta11135k

Cited by 129 publications

(89 citation statements)

References 51 publications

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“…However, challenging issues including low catalytic activity of the anodic catalyst, high cost of the Pt-based electrocatalyst, and the poisoning of Pt by CO-like species during methanol oxidation are the main obstacles to the commercialization of DMFC technology. In order to enhance the activities of electrocatalysts and decrease the usage of Pt-based electrocatalysts, various nanostructured carbon materials have been used to effectively disperse metal nanoparticles [2][3][4]. Among them, graphene or reduced graphene oxide (RGO) attracts particular interest by its exceptional electrical conductivity, large surface area and great chemical stability [5].…”

Section: Introductionmentioning

confidence: 99%

Electroless synthesis of two-dimensional sandwich-like Pt/Mn3O4/reduced-graphene-oxide nanocomposites with enhanced electrochemical performance for methanol oxidation

Huang

Gao

et al. 2014

Electrochimica Acta

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Section: Introductionmentioning

confidence: 99%

Electroless synthesis of two-dimensional sandwich-like Pt/Mn3O4/reduced-graphene-oxide nanocomposites with enhanced electrochemical performance for methanol oxidation

Huang

Gao

et al. 2014

Electrochimica Acta

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“…The fully exposed topographic features of the CGFs were further demonstrated by nitrogen adsorption/desorption isotherms. As shown in Figure S3 (in the Supporting Information), the specific surface areas of the CGFs were around 200 m 2 g −1 , which is larger than that of previously reported carbon catalysts based on graphene and CNTs . This might be ascribed to the reduction of graphene restacking during our spray‐drying process, giving rise to the full exposure of carbon skeletons.…”

Section: Resultsmentioning

confidence: 99%

Carbon Nanotubes Loaded on Graphene Microfolds as Efficient Bifunctional Electrocatalysts for the Oxygen Reduction and Oxygen Evolution Reactions

et al. 2017

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Advanced bifunctional electrocatalysts for the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) are promising to improve the efficiency of fuel cells and metal–air batteries. Among the state‐of‐the‐art efficient oxygen electrocatalysts, heteroatom‐doped carbon materials are favorable candidates. However, the enriched doping requires a highly exposed carbon skeleton. Here, we report a scalable route to prepare carbon nanotubes (CNTs) loaded on graphene microfolds (CGFs) by a low‐temperature spray‐drying procedure. Molecular‐level assembly of graphene and CNTs, mesoporous structures, and large specific surface areas permit the carbon skeleton of CGFs to be highly exposed. After doping with abundant nitrogen and phosphorous (5.58 at % for N, 0.1 at % for P), CGFs exhibit excellent bifunctional electrocatalytic activity for both the ORR and OER, with superb durability and methanol tolerance. The measured variance of the ORR and OER metrics (ΔE=Ej=10−E1/2) was low at 0.9 V versus reversible hydrogen electrode (vs. RHE), being within only 20 mV of Pt‐ and Ru‐based electrodes, and superior to transition‐metal‐based catalysts and other carbon catalysts. Such efficient overall electrocatalytic activity allows CGFs to be used for high‐performance oxygen electrodes in renewable energy devices.

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“…In spite of aforesaid excellent properties, the stability issue still persists. So efforts have been done to combine the CNTs with another material such as metal oxides (SnO 2 , TiO 2 , and MnO 2 ), conducting polymers (eg, PANI), nitrides (TiN and WN), and graphene and employ them as support of Pt . For example, Ramesh at el.…”

Section: Hybrid Supportsmentioning

confidence: 99%

Recent advances in hybrid support material for Pt‐based electrocatalysts of proton exchange membrane fuel cells

et al. 2018

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Summary Proton exchange membrane fuel cell is an energy conversion technology with an excellent potential to replace fossil fuel–based internal combustion engines. Evenly distributed Pt on conductive support is commonly used as an electrocatalyst. This catalyst support material is a key component of proton exchange membrane fuel cell as it greatly affects the cost, durability, and electrochemical activity of fuel cells. Although the carbon‐based support materials have evolved in the last few decades, there is still need to explore other alternatives as the corrosion of carbon is inevitable under the harsh environments within the catalyst layer of proton exchange membrane fuel cells. Moreover, the performance of noncarbon supports is also not satisfactory. Therefore, the advent of hybrid support materials, which are electrochemically stable and cost‐effective, is required. The hybrid supports exhibiting the characteristics of contributing component, or even showing synergistic effect, would circumvent the shortcomings associated with individual components. This review introduces the recent advances in hybrid support materials, including carbonaceous and noncarbonaceous one; discusses the pros and cons of different support materials; and highlights the improved properties of hybrid supports as compared with the individual components.

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A highly efficient transition metal nitride-based electrocatalyst for oxygen reduction reaction: TiN on a CNT–graphene hybrid support

Cited by 129 publications

References 51 publications

Electroless synthesis of two-dimensional sandwich-like Pt/Mn3O4/reduced-graphene-oxide nanocomposites with enhanced electrochemical performance for methanol oxidation

Electroless synthesis of two-dimensional sandwich-like Pt/Mn3O4/reduced-graphene-oxide nanocomposites with enhanced electrochemical performance for methanol oxidation

Carbon Nanotubes Loaded on Graphene Microfolds as Efficient Bifunctional Electrocatalysts for the Oxygen Reduction and Oxygen Evolution Reactions

Recent advances in hybrid support material for Pt‐based electrocatalysts of proton exchange membrane fuel cells

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