Facile potentiostatic preparation of functionalized polyterthiophene-anchored graphene oxide as a metal-free electrocatalyst for the oxygen reduction reaction

2015 ◽  
Vol 3 (10) ◽  
pp. 5426-5433 ◽  
Author(s):  
M. Halappa Naveen ◽  
Hui-Bog Noh ◽  
Md Shahriar Al Hossain ◽  
Jung Ho Kim ◽  
Yoon-Bo Shim
Keyword(s):  
Graphene Oxide ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Active Sites ◽  
Reduction Reaction ◽  
Metal Free

A new polyterthiophene-anchored GO electrocatalyst was prepared. The C–N bonds of the polymer served as active sites for the ORR catalyst.

scholarly journals Fe-doped mayenite electride composite with 2D reduced Graphene Oxide: As a non-platinum based, highly durable electrocatalyst for Oxygen Reduction Reaction

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Karim Khan ◽  
Ayesha Khan Tareen ◽  
Muhammad Aslam ◽  
Sayed Ali Khan ◽  
Qasim khan ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Reduced Graphene Oxide ◽  
Precious Metal ◽  
Active Sites ◽  
Reduction Reaction ◽  
Metal Free ◽  
Reduced Graphene ◽  
Iron Based

AbstractSince the last decades, non-precious metal catalysts (NPMC), especially iron based electrocatalysts show sufficient activity, potentially applicant in oxygen reduction reaction (ORR), however they only withstand considerable current densities at low operating potentials. On the other hand iron based electrocatalysts are not stable at elevated cathode potentials, which is essential for high energy competence, and its remains difficult to deal. Therefore, via this research a simple approach is demonstrated that allows synthesis of nanosize Fe-doped mayenite electride, [Ca24Al28O64]4+·(e−)4 (can also write as, C12A7−xFex:e−, where doping level, x = 1) (thereafter, Fe-doped C12A7:e−), consist of abundantly available elements with gram level powder material production, based on simple citrate sol-gel method. The maximum achieved conductivity of this first time synthesized Fe-doped C12A7:e− composite materials was 249 S/cm. Consequently, Fe-doped C12A7:e− composite is cost-effective, more active and highly durable precious-metal free electrocatalyst, with 1.03 V onset potential, 0.89 V (RHE) half-wave potential, and ~5.9 mA/cm2 current density, which is higher than benchmark 20% Pt/C (5.65 mA/cm2, and 0.84 V). The Fe-doped C12A7:e− has also higher selectivity for desired 4e− pathway, and more stable than 20 wt% Pt/C electrode with higher immunity towards methanol poisoning. Fe-doped C12A7:e− loses was almost zero of its original activity after passing 11 h compared to the absence of methanol case, indicates that to introduce methanol has almost negligible consequence for ORR performance, which makes it highly desirable, precious-metal free electrocatalyst in ORR. This is primarily described due to coexistence of Fe-doped C12A7:e− related active sites with reduced graphene oxide (rGO) with pyridinic-nitrogen, and their strong coupling consequence along their porous morphology textures. These textures assist rapid diffusion of molecules to catalyst active sites quickly. In real system maximum power densities reached to 243 and 275 mW/cm2 for Pt/C and Fe-doped C12A7:e− composite, respectively.

Doping and reduction of graphene oxide using chitosan-derived volatile N-heterocyclic compounds for metal-free oxygen reduction reaction

Carbon ◽  
2017 ◽  
Vol 120 ◽  
pp. 419-426 ◽  
Author(s):  
Subodh Kumar ◽  
Shmuel Gonen ◽  
Ariel Friedman ◽  
Lior Elbaz ◽  
Gilbert D. Nessim
Keyword(s):  
Graphene Oxide ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Heterocyclic Compounds ◽  
Reduction Reaction ◽  
Free Oxygen ◽  
Metal Free

scholarly journals Noble-metal-free Co3S4–S/G porous hybrids as an efficient electrocatalyst for oxygen reduction reaction

2016 ◽  
Vol 7 (7) ◽  
pp. 4167-4173 ◽  
Author(s):  
Wenling Gu ◽  
Liuyong Hu ◽  
Wei Hong ◽  
Xiaofang Jia ◽  
Jing Li ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Noble Metal ◽  
High Efficiency ◽  
Reduction Reaction ◽  
Free Oxygen ◽  
Metal Free ◽  
Reduced Graphene ◽  
Support Matrix

A high-efficiency noble-metal-free oxygen reduction reaction (ORR) catalyst was obtained based on the pyrolysis of the inexpensive precursor cobalt dithiolene (an S4-chelate complex) on simultaneously reduced graphene oxide (GO) as a support matrix.

Efficient amine functionalization of graphene oxide through the Bucherer reaction: an extraordinary metal-free electrocatalyst for the oxygen reduction reaction

RSC Advances ◽  
2015 ◽  
Vol 5 (74) ◽  
pp. 59874-59880 ◽  
Author(s):  
Aso Navaee ◽  
Abdollah Salimi
Keyword(s):  
Graphene Oxide ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Reliable Method ◽  
Reduction Reaction ◽  
Amine Functionalization ◽  
Metal Free

A simple and reliable method based on the Bucherer reaction is proposed for the functionalization of graphene oxide (GO) with amine (–NH2) groups.

Sign in / Sign up

Export Citation Format

Share Document