Heterojunctions of silver–iron oxide on graphene for laser-coupled oxygen reduction reactions

Abstract

We report a two-step hybridization of N-doped graphene and Ag-decorated Fe2O3 hematite to realize a balanced oxygen adsorption/desorption equilibrium and a laser-coupled ORR (LORR). The stable plateau currents with n values of 3.9 in a wide potential range (0.2-0.7 V) and 7.5% peroxide inhibition of the LORR are found to be directly associated with the Ag/Fe2O3 heterojunction, where interactions of semiconductor band gap excitation and plasmonic resonance-induced hot electrons are proposed to occur.

Free‐Standing 3D Electrodes for Electrochemical Detection of Hydrogen Peroxide

“…For further explorations, theoretical simulation about the interactions between the intermediates and the catalytic surface for thermodynamics and molecular dynamics could be an important approach for in‐depth understanding. Due to the intrinsic correlation between redox of H 2 O 2 and oxygen reduction reaction, the electrocatalyst with a low overpotential for ORR might be favorable for H 2 O 2 redox . It is worth noting that, most recent free‐standing 3D electrodes are tested in the typical three‐electrode system, real self‐standing devices integrating 3D electrodes with suitable reference electrode and counter electrode are in need for practical applications.…”

“…Due to the intrinsic correlation between redox of H 2 O 2 and oxygen reduction reaction, the electrocatalyst with a low overpotential for ORR might be favorable for H 2 O 2 redox. [175,176] It is worth noting that, most recent free- [170] Reprinted with permission from [170], copyright 2014, with permission from Elsevier. (c) Structure of Au-luminol based microelectrode for electrochemical imaging of intracellular H 2 O 2 ; (d) image of the microelectrode in the cell.…”

Electrochemical sensor based on a three dimensional nanostructured MoS2 nanosphere-PANI/reduced graphene oxide composite for simultaneous detection of ascorbic acid, dopamine, and uric acid

“…31,32 Diverse shapes of nanoparticles distributed and anchored on graphene sheets can be achieved by varying synthesis conditions. 33,34 Additionally, conductive polymers such as polyaniline (PANI) have also been used to functionalize MoS 2 to improve the electro conductivity of the materials for the detection of dopamine. 35 MoS 2 /PANI/rGO aerogel nanocomposite exhibited excellent long-term cycling stability and a high capacity.…”

Iron and nitrogen codoped carbon catalyst with excellent stability and methanol tolerance for oxygen reduction reaction

“…Electrocatalytic results indicated that the metal‐free catalyst could also show excellent catalytic performances for ORR. From then on, nitrogen‐doped carbon nanotubes, nitrogen‐doped graphene, C 3 N 4 , and other carbon‐based materials became the research focus in the field of electrocatalysis . Besides N atoms, other non‐metal atoms such as S, B, and P as well as the transition metal atoms such as Fe, Co, Ni, and Cu have been chosen as the heteroatoms in carbon materials to form doped catalysts for ORR .…”

“…From then on, nitrogen-doped carbon nanotubes, nitrogen-doped graphene, C 3 N 4 , and other carbon-based materials became the research focus in the field of electrocatalysis. [17][18][19][20][21][22][23][24] Besides N atoms, other non-metal atoms such as S, B, and P as well as the transition metal atoms such as Fe, Co, Ni, and Cu have been chosen as the heteroatoms in carbon materials to form doped catalysts for ORR. [25][26][27][28][29][30] It is reported that the high catalytic activity and stability of the catalysts pyrolyzed at high temperature arise from the active sites such as Fe, FeN x , FeO x , and FeC, which makes the heteroatom-doped carbon materials have comparable catalytic performances with Pt-based catalysts.…”