Novel Composites of α‐Fe<sub>2</sub>O<sub>3</sub> Tetrakaidecahedron and Graphene Oxide as an Effective Photoelectrode with Enhanced Photocurrent Performances

Luo

Chemistry An Asian Journal

et al. 2017

Iron-based (oxy)hydroxides are especially attractive electrocatalysts for the oxygen evolution reaction (OER) owing to their earth abundance, low cost, and nontoxicity. However, poor OER kinetics on the surface restricts the performance of the FeOOH electrocatalyst. Herein, a highly efficient and stable Ni(OH) /β-like FeOOH electrocatalyst is obtained by facile electroactivation treatment. The activated Ni(OH) /β-like FeOOH sample indicates an overpotential of 300 mV at 10 mA cm for the OER, and no clear current decay after 50 h of testing; this is comparable to the most efficient nickel- and cobalt-based electrocatalysts on planar substrates. Furthermore, studies suggest that β-like FeOOH plays a key role in remarkably enhancing the performance during the electroactivation process owing to its metastable tunnel structure with a lower barrier for interface diffusion of Ni ions between the bilayer electrocatalyst. This study develops a new strategy to explore efficient and low-cost electrocatalysts and deepens understanding of bilayer electrocatalysts for the OER.

Section: Introductionmentioning

confidence: 99%

Interface‐Engineered Ni(OH)₂/β‐like FeOOH Electrocatalysts for Highly Efficient and Stable Oxygen Evolution Reaction

Luo

Chemistry An Asian Journal

et al. 2017

“…Graphene nanosheet/carbon nanotube/polyaniline composites have been prepared by in‐situ polymerization method and can be used in high‐performance supercapacitors . α‐Fe 2 O 3 /graphene and α‐Fe 2 O 3 /graphene oxide composites have been prepared by the hydrothermal method, which show enhanced photocatalytic and electrocatalytic properties, respectively ,. However, harsh chemicals, heavy instrumentation and multiple processing steps are usually involved in the synthesis of nanostructured hybrid materials.…”

Section: Introductionmentioning

confidence: 99%

One‐Step Synthesis of Multifunctional Zinc‐Iron‐Oxide Hybrid Carbon Nanowires by Chemical Fusion for Supercapacitors and Interfacial Water Marbles

et al. 2018

Hybrid carbon nanowires with tunable elemental composition and nanoscale component mixing resolution can be synthesized by a chemical fusion method in one pot, using a unique heating mechanism of conducting polymers under the electromagnetic field of microwave. Carbon nanowire matrices hybridized with metals and oxides can be facilely synthesized by simple instrumentation and processes within tens of seconds. Different metallic precursors (e. g. Fe and Zn) can be selectively incorporated in the chemical fusion process that substantially integrated with the carbon nanowire matrices during the growth process while their characteristic functions are infused. The hybrid carbon nanowires show excellent electrochemical supercapacitive and supramolecular self‐assembly properties owing to the unique hybrid nanostructures and surface characteristics. “Interfacial water marbles” can be obtained by the supramolecular self‐assembly of hybrid carbon nanowires on the water/hexane interface. The interfacial water marbles are semi‐permanent and completely impede the event of coalescence cascade, demonstrating significant applications in mass transport, microfluidics, and interfacial synthesis.

“…MoS 2 nanosheet@TiO 2 nanotube arrays obtained by Zheng et al possessed both enhanced photoactivity at the degradation of rhodamine B (RhB) and improved photocurrent performances. α‐Fe 2 O 3 /graphene oxide have been successfully fabricated with effective photocurrent response . However, these materials are usually in the form of powders, nanoparticles, and/or nanowires, which are very difficult to be removed from water after photocatalysis and inevitably cause secondary pollution, not to mention the cycle use of them .…”

Section: Introductionmentioning

confidence: 99%

“…a-Fe 2 O 3 /graphene oxide have been successfully fabricated with effective photocurrent response. 7 However, these materials are usually in the form of powders, nanoparticles, and/or nanowires, which are very difficult to be removed from water after photocatalysis and inevitably cause secondary pollution, not to mention the cycle use of them. [8][9][10][11][12] Until now, little attention has been paid to the separation of the photocatalysts.…”

Section: Introductionmentioning

confidence: 99%

Rapid mass production of novel 3D Cu@CuI core‐shell mesh as highly flexible and efficient photocatalyst

Zhang

et al. 2018

J Am Ceram Soc

We report a relatively simple and economical approach for mass production of Cu@CuI mesh. This novel core‐shell structure is CuI‐coated Cu mesh, fabricated by one‐step in situ iodination of commercial copper mesh at an ambient temperature. Such a Cu@CuI mesh is low‐cost and can be successfully used for the degradation of soluble organic pollutants in water under UV light. The novel 3D Cu@CuI core‐shell structure allows for high electron/hole separation and thus leads to high catalytic efficiency. Rhodamine B (RhB) is fully degraded in even just 6 minutes using a Cu@CuI mesh as the photocatalyst. Unlike the currently reported photocatalysts mostly in the form of powders, nanoparticles, and/or nanowires, the 3D Cu@CuI mesh is freestanding and flexible, and therefore is easily separated from water after photocatalysis without causing secondary pollution. This is a significant advance toward tackling the expansive separation issue of the conventional catalysts, because the ultra‐simple separation process of 3D Cu@CuI mesh can facilitate its industry application. With a fantastic combination of low cost, facile and green fabrication, high catalytic efficiency and easy separation 3D architecture, the Cu@CuI mesh may serve as a promising candidate for water purification.