Carbon Quantum Dot/NiFe Layered Double-Hydroxide Composite as a Highly Efficient Electrocatalyst for Water Oxidation

Tang, Di; Liu, Juan; Wu, Xuanyu; Liu, Ruihua; Han, Xijiang; Han, Yuzhi; Huang, Hui; Liu, Yang

doi:10.1021/am501256x

Cited by 434 publications

(249 citation statements)

References 42 publications

(69 reference statements)

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“…The electrical conductivity of OER active materials can be improved by hybridization with carbon because of the resulting conductive electron path. [104][105][106][107][108][109][110][111][112][113] In addition, the electrochemically active surface area and porosity can be increased when the catalysts are uniformly deposited on carbon materials with high surface nanostructures such as carbon nanotubes (CNTs) or graphene sheets. [104,[106][107][108][109][110][111][112] Chen et al reported a 3D N-doped graphene hydrogel/Ni-Co LDH catalyst, which exhibited 400 mV at 145.3 mA cm −2 .…”

Section: Nanostructured and Hybrid-structured Ldhmentioning

confidence: 99%

Recent Progress on Multimetal Oxide Catalysts for the Oxygen Evolution Reaction

Kim

et al. 2018

Advanced Energy Materials

655

487

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fossil fuels are being widely researched for the development of a sustainable energy system. Among the various candidates for green energy resources, hydrogen energy has been at the center of attention. [1,2] Hydrogen is both inexhaustible and environmentally friendly, because it can be produced from earth-abundant reactants such as water and methane and because no CO 2 or other toxic products are emitted during its conversion into other energy form such as electricity, respectively. Moreover, hydrogen can exhibit significantly larger energy density compared with other energy sources such as gasoline and coal. The most widely used method of hydrogen production today is steam reforming because of its low cost in the process. [3] Nevertheless, the release of carbon monoxide or carbon dioxide as byproducts in the steam reforming process diminishes the environmental merits of hydrogen energy. Thus, as a possible cleaner alternative, an electrolysis method that involves producing hydrogen by electrochemically splitting water has been extensively investigated. Using one of the most abundant resources, water, the production of hydrogen from it yields only oxygen as a byproduct.In the water electrolysis, the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) occur simultaneously, as described by the following equationsIn order for the reaction to proceed, a voltage of 1.23 V is theoretically required between an anode and a cathode. However, an overpotential (represented by the symbol η) should be additionally applied to account for the potential loss resulting from kinetic limitations occurring during the electrochemical reaction. The use of electrocatalysts can lower the overpotential by kinetically facilitating the water-splitting reaction either in HER or OER. Due to the nature of four-electron involving OER, it is generally believed that the OER is much more sluggish than the HER; thus, the development of efficient OER Hydrogen is a promising alternative fuel for efficient energy production and storage, with water splitting considered one of the most clean, environmentally friendly, and sustainable approaches to generate hydrogen. However, to meet industrial demands with electrolysis-generated hydrogen, the development of a low-cost and efficient catalyst for the oxygen evolution reaction (OER) is critical, while conventional catalysts are mostly based on precious metals. Many studies have thus focused on exploring new efficient nonprecious-metal catalytic systems and improving the understandings on the OER mechanism, resulting in the design of catalysts with superior activity compared with that of conventional catalysts. In particular, the use of multimetal rather than single-metal catalysts is demonstrated to yield remarkable performance improvement, as the metal composition in these catalysts can be tailored to modify the intrinsic properties affecting the OER. Herein, recent progress and accomplishments of multimetal catalytic systems, including several important groups of catalysts: layered h...

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Section: Nanostructured and Hybrid-structured Ldhmentioning

confidence: 99%

Recent Progress on Multimetal Oxide Catalysts for the Oxygen Evolution Reaction

Kim

et al. 2018

Advanced Energy Materials

655

487

View full text Add to dashboard Cite

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“…Electrocatalyst [206] The oxygen evolution reaction (OER) is kinetically slow owning to its multistep proton-coupled electron transfer process, so the electrolysis must require a relative high potential than thermodynamic potential for water-splitting. 10 RuO 2 and IrO 2 are regarded as the most active OER catalysts, but the lacking of Ru and Ir makes it impractical to use the metals on a large scale [207][208][209].…”

Section: Cds/nife Layered Double Hydroxide Compositementioning

confidence: 99%

Catalytic Applications of Carbon Dots

Kang

Liu

2016

Carbon Nanoparticles and Nanostructures

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Carbon materials have been used for a long time in heterogeneous catalysis, which can satisfy most of the desirable properties required for a suitable catalyst support. Based on their significant advantages, such as low cost, huge amount, easy accessibility, high surface area, diverse porous structure, and resistance to acidic or basic environments, the carbon nanostructures are hungered for using as proper catalysts directly. Carbon dots (CDs), a new class of carbon nanomaterials with sizes below 10 nm, were also demonstrated to be efficient catalysts, such as, photocatalysts for selective oxidation, light-driven acid-catalysis and hydrogen bond catalysis. In this chapter, we will highlight the preparative methods, which have been used successfully to produce active, selective and durable CDs catalysts and look at their properties and the reactions which they promote. We then consider the catalysts design based on these new CDs and look into the future.

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“…Two typical characteristic peaks were located at $1336 and $1607 cm À1 which were attributed to the D-and G-band of carbon, respectively. The CQDs are full of functional groups (hydroxyl and carboxyl groups) on their surface and fragmented graphitic structure with no further modification [25,30]. From the previous literature reported by our group, the base titration could be used to quantify the hydroxyl and carboxyl groups on the surface of the water-soluble CQDs ($5 nm) [25,31].…”

Section: Resultsmentioning

confidence: 99%

“…In the experiment, the CQDs were synthesized by a facile electrochemical etching method reported by our group [30]. Two graphite rods (99.99%, Alfa Aesar Co. Ltd.) with a separation of 7.5 cm were inserted into a certain amount of ultrapure water, one as the anode, and the other as the counter electrode.…”

Section: Synthesis Of Cqdsmentioning

confidence: 99%

“…Our previous study revealed that CQDs enhanced photocatalytic activity and structural stability of the Ag 3 PO 4 complex photocatalysts, in which the CQDs layer on the surface of Ag 3 PO 4 and Ag/Ag 3 PO 4 particles could effectively protect Ag 3 PO 4 from dissolution [28]. Recently, our group synthesized the novel CQDs/NiFe-LDH composite catalysts, which displayed good OER electrocatalytic activity with a high current and a small over potential in alkaline electrolytes [30]. In our structural design, the combination of CQDs with SnO 2 and Co 3 O 4 could effectively avert SnO 2 dissolving in alkaline solution, leading to the structural stability owing to the insoluble CQDs layer on the surface of SnO 2 .…”

Section: Introductionmentioning

confidence: 99%

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