scholarly journals N, S and Transition-Metal Co-Doped Graphene Nanocomposites as High-Performance Catalyst for Glucose Oxidation in a Direct Glucose Alkaline Fuel Cell

Nanomaterials ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 202
Author(s):  
Yexin Dai ◽  
Jie Ding ◽  
Jingyu Li ◽  
Yang Li ◽  
Yanping Zong ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Active Sites ◽  
High Performance ◽  
Glucose Oxidation ◽  
Alkaline Fuel Cell ◽  
Blank Group ◽  
Graphene Nanocomposites ◽  
Doped Graphene ◽  
One Step ◽  
Hydrothermal Approach

In this work, reduced graphene oxide (rGO) nanocomposites doped with nitrogen (N), sulfur (S) and transitional metal (Ni, Co, Fe) were synthesized by using a simple one-step in-situ hydrothermal approach. Electrochemical characterization showed that rGO-NS-Ni was the most prominent catalyst for glucose oxidation. The current density of the direct glucose alkaline fuel cell (DGAFC) with rGO-NS-Ni as the anode catalyst reached 148.0 mA/cm2, which was 40.82% higher than the blank group. The DGAFC exhibited a maximum power density of 48 W/m2, which was more than 2.08 folds than that of blank group. The catalyst was further characterized by SEM, XPS and Raman. It was speculated that the boosted performance was due to the synergistic effect of N, S-doped rGO and the metallic redox couples, (Ni2+/Ni3+, Co2+/Co3+ and Fe2+/Fe3+), which created more active sites and accelerated electron transfer. This research can provide insights for the development of environmental benign catalysts and promote the application of the DGAFCs.

scholarly journals Facile Synthesis of Uniform Mesoporous Nb2O5 Micro-Flowers for Enhancing Photodegradation of Methyl Orange

Materials ◽  
2021 ◽  
Vol 14 (14) ◽  
pp. 3783
Author(s):  
Jian-Qing Qiu ◽  
Huan-Qing Xie ◽  
Ya-Hao Wang ◽  
Lan Yu ◽  
Fang-Yuan Wang ◽  
...  
Keyword(s):  
Methyl Orange ◽  
Active Sites ◽  
High Performance ◽  
Diffuse Reflectance Spectroscopy ◽  
X Ray Diffraction ◽  
Flower Structure ◽  
Electron Microscopies ◽  
Bet Method ◽  
One Step ◽  
Catalytic Active Sites

The removal of organic pollutants using green environmental photocatalytic degradation techniques urgently need high-performance catalysts. In this work, a facile one-step hydrothermal technique has been successfully applied to synthesize a Nb2O5 photocatalyst with uniform micro-flower structure for the degradation of methyl orange (MO) under UV irradiation. These nanocatalysts are characterized by transmission and scanning electron microscopies (TEM and SEM), X-ray diffraction (XRD), Brunauer–Emmett–Teller (BET) method, and UV-Vis diffuse reflectance spectroscopy (DRS). It is found that the prepared Nb2O5 micro-flowers presents a good crystal phases and consist of 3D hierarchical nanosheets with 400–500 nm in diameter. The surface area is as large as 48.6 m2 g−1. Importantly, the Nb2O5 micro-flowers exhibit superior catalytic activity up to 99.9% for the photodegradation of MO within 20 mins, which is about 60-fold and 4-fold larger than that of without catalysts (W/O) and commercial TiO2 (P25) sample, respectively. This excellent performance may be attributed to 3D porous structure with abundant catalytic active sites.

scholarly journals Ultrafast-charging and long cycle-life anode materials of TiO2-bronze/nitrogen-doped graphene nanocomposites for high-performance lithium-ion batteries

RSC Advances ◽  
2020 ◽  
Vol 10 (71) ◽  
pp. 43811-43824
Author(s):  
Thanapat Autthawong ◽  
Yothin Chimupala ◽  
Mitsutaka Haruta ◽  
Hiroki Kurata ◽  
Tsutomu Kiyomura ◽  
...  
Keyword(s):  
Anode Materials ◽  
High Performance ◽  
High Stability ◽  
Lithium Ion ◽  
Graphene Nanocomposites ◽  
Nitrogen Doped ◽  
Long Cycle Life ◽  
Fast Charging ◽  
Nitrogen Doped Graphene ◽  
Doped Graphene

The TiO2-bronze/nitrogen-doped graphene nanocomposites have the potential for fast-charging and have high stability, showing potential as an anode material in advanced power batteries for next-generation applications.

High Performance Pd-CeO 2-NR Supported on Graphene and N-Doped Graphene for the ORR and Its Application in a Microbial Fuel Cell

2017 ◽  
Vol 77 (11) ◽  
pp. 1359-1365 ◽  
Author(s):  
J.C. Carrillo-Rodríguez ◽  
S. García-Mayagoitia ◽  
R. Pérez-Hernández ◽  
M.T. Ochoa-Lara ◽  
F. Espinosa-Magaña ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Microbial Fuel Cell ◽  
High Performance ◽  
Doped Graphene

Cu Nanoclusters/FeN4 Amorphous Composites with Dual Active Sites in N-Doped Graphene for High-Performance Zn–Air Batteries

2020 ◽  
Vol 12 (28) ◽  
pp. 31340-31350 ◽  
Author(s):  
Li Xu ◽  
Yuhui Tian ◽  
Daijie Deng ◽  
Hongping Li ◽  
Duo Zhang ◽  
...  
Keyword(s):  
Active Sites ◽  
High Performance ◽  
Doped Graphene ◽  
Cu Nanoclusters

Facile controlled synthesis of a hierarchical porous nanocoral-like Co3S4 electrode for high-performance supercapacitors

RSC Advances ◽  
2016 ◽  
Vol 6 (59) ◽  
pp. 54076-54086 ◽  
Author(s):  
Guijing Liu ◽  
Bo Wang ◽  
Lei Wang ◽  
Tiefeng Liu ◽  
Tiantian Gao ◽  
...  
Keyword(s):  
High Performance ◽  
Controlled Synthesis ◽  
Hierarchical Porous ◽  
One Step ◽  
Hydrothermal Approach

In this work, a hierarchical porous coral-like Co3S4 electrode is synthesized by a facile one-step hydrothermal approach showing high-performance as a supercapacitor.

scholarly journals High-performance fuel cell cathodes exclusively containing atomically dispersed iron active sites

2019 ◽  
Vol 12 (8) ◽  
pp. 2548-2558 ◽  
Author(s):  
Hanguang Zhang ◽  
Hoon T. Chung ◽  
David A. Cullen ◽  
Stephan Wagner ◽  
Ulrike I. Kramm ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Active Sites ◽  
High Performance ◽  
Platinum Group Metal ◽  
Reduction Reaction ◽  
Polymer Electrolyte Fuel Cells ◽  
Metal Free ◽  
Fuel Cell Cathodes ◽  
Iron Active Sites ◽  
Cell Cathodes

Platinum group metal-free (PGM-free) catalysts for the oxygen reduction reaction (ORR) with atomically dispersed FeN4 sites have emerged as a potential replacement for low-PGM catalysts in acidic polymer electrolyte fuel cells (PEFCs).

Scalable one-step synthesis of N,S co-doped graphene-enhanced hierarchical porous carbon foam for high-performance solid-state supercapacitors

2019 ◽  
Vol 7 (13) ◽  
pp. 7591-7603 ◽  
Author(s):  
Liya Ma ◽  
Jin Liu ◽  
Song Lv ◽  
Qin Zhou ◽  
Xinyu Shen ◽  
...  
Keyword(s):  
Solid State ◽  
High Performance ◽  
Carbon Foam ◽  
Electrochemical Performances ◽  
Step Method ◽  
Supercapacitor Electrode ◽  
Hierarchical Porous ◽  
Doped Graphene ◽  
One Step ◽  
Co Doped

N,S co-doped graphene-enhanced HPC is prepared by a facile one-step method, and exhibits superior electrochemical performances as a solid-state supercapacitor electrode.

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