Detail publikačního výsledku

Ultrapure Graphene Is a Poor Electrocatalyst: Definitive Proof of the Key Role of Metallic Impurities in Graphene-Based Electrocatalysis

MAZÁNEK, V.; LUXA, J.; MATĚJKOVÁ, S.; KUČERA, J.; SEDMIDUBSKÝ, D.; PUMERA, M.; SOFER, Z.

Originální název

Ultrapure Graphene Is a Poor Electrocatalyst: Definitive Proof of the Key Role of Metallic Impurities in Graphene-Based Electrocatalysis

Anglický název

Ultrapure Graphene Is a Poor Electrocatalyst: Definitive Proof of the Key Role of Metallic Impurities in Graphene-Based Electrocatalysis

Druh

Článek WoS

Originální abstrakt

Graphene and its derivatives have been reported in many articles as "metal-free" carbon electrocatalytic materials. Its synthesis procedures are generally based on the chemical oxidation of graphite and subsequent thermal or chemical reduction. Because graphene oxide has a large surface area and typically contains a variety of oxygen functionalities, metallic ions (impurities) from reaction mixtures can be adsorbed on its surface. These impurities can significantly enhance the electrocatalytic activity and thus lead to data misinterpretation; such impure samples are referred to as "metal-free" catalysts. In this paper, we report the synthesis of impurity-free graphene, which is compared with graphene prepared by standard methods based on the thermal and chemical reduction of two graphene oxides. Detailed analysis of graphene prepared by standard methods shows a direct relation between metallic impurities and the electrocatalytic activity of graphene. In contrast, impurity-free graphene exhibits poor electrocatalytic activity.

Anglický abstrakt

Graphene and its derivatives have been reported in many articles as "metal-free" carbon electrocatalytic materials. Its synthesis procedures are generally based on the chemical oxidation of graphite and subsequent thermal or chemical reduction. Because graphene oxide has a large surface area and typically contains a variety of oxygen functionalities, metallic ions (impurities) from reaction mixtures can be adsorbed on its surface. These impurities can significantly enhance the electrocatalytic activity and thus lead to data misinterpretation; such impure samples are referred to as "metal-free" catalysts. In this paper, we report the synthesis of impurity-free graphene, which is compared with graphene prepared by standard methods based on the thermal and chemical reduction of two graphene oxides. Detailed analysis of graphene prepared by standard methods shows a direct relation between metallic impurities and the electrocatalytic activity of graphene. In contrast, impurity-free graphene exhibits poor electrocatalytic activity.

Klíčová slova

metallic impurities; purification; graphene; electrocatalysis; doping; neutron activation analysis

Klíčová slova v angličtině

metallic impurities; purification; graphene; electrocatalysis; doping; neutron activation analysis

Autoři

MAZÁNEK, V.; LUXA, J.; MATĚJKOVÁ, S.; KUČERA, J.; SEDMIDUBSKÝ, D.; PUMERA, M.; SOFER, Z.

Rok RIV

2020

Vydáno

01.02.2019

ISSN

1936-0851

Periodikum

ACS Nano

Svazek

13

Číslo

2

Stát

Spojené státy americké

Strany od

1574

Strany do

1582

Strany počet

9

URL

https://pubs.acs.org/doi/abs/10.1021/acsnano.8b07534

BibTex

@article{BUT158446,
  author="Vlastimil {Mazánek} and Jan {Luxa} and Stanislava {Matějková} and Jan {Kučera} and David {Sedmidubský} and Martin {Pumera} and Zdeněk {Sofer}",
  title="Ultrapure Graphene Is a Poor Electrocatalyst: Definitive Proof of the Key Role of Metallic Impurities in Graphene-Based Electrocatalysis",
  journal="ACS Nano",
  year="2019",
  volume="13",
  number="2",
  pages="1574--1582",
  doi="10.1021/acsnano.8b07534",
  issn="1936-0851",
  url="https://pubs.acs.org/doi/abs/10.1021/acsnano.8b07534"
}