A Reliable Aerosol‐Spray‐Assisted Approach to Produce and Optimize Amorphous Metal Oxide Catalysts for Electrochemical Water Splitting

Kuai, Long; Geng, Jing; Chen, Changyu; Kan, Erjie; Liu, Yadong; Wang, Qing; Geng, Baoyou

doi:10.1002/anie.201404208

Cited by 256 publications

(158 citation statements)

References 32 publications

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“…Therefore, special attention has been paid to the development of synthetic methods that enable the composition control with a homogeneous distribution of elements. Such synthesis methods include electrodeposition, [29,93,[150][151][152][153][154][155] photochemical metal-organic deposition (PMOD), [156][157][158][159][160] aerosol-sprayassisted processes, [161,162] reactive magnetron co-sputtering, [163] solvothermal processes, [164] and thermal decomposition. [165] …”

Section: Amorphous Metal Oxidesmentioning

confidence: 99%

Recent Progress on Multimetal Oxide Catalysts for the Oxygen Evolution Reaction

Kim

et al. 2018

Advanced Energy Materials

719

498

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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: Amorphous Metal Oxidesmentioning

confidence: 99%

Recent Progress on Multimetal Oxide Catalysts for the Oxygen Evolution Reaction

Kim

et al. 2018

Advanced Energy Materials

719

498

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“…Spherical structure is also favorable in terms of surface energy. Nanospheres are the most reported shape of amorphous materials in the last decade (see Table 1), and they can be composed of calcium carbonate (CaCO 3 ) [43][44][45][46][47], silicon (Si) [48][49][50][51][52], metals or their compounds [53][54][55][56][57][58][59][60][61]. CaCO 3 is abundant in the natural world, and a typical model system used to mimic the mineralization process of biominerals [43].…”

Section: Morphologies Of Amorphous Nanomaterials Spheresmentioning

confidence: 99%

“…The large number of under-coordinated atoms (good electron acceptors) and reactive sites at the surface means that amorphous materials also have the advantage over crystalline ones in their contact with the electrolyte and active substances (electron donors), which favors electrochemical processes. In regard to the merits discussed above, amorphous nanomaterials have already demonstrated their superior performance over bulk crystalline materials in various electrochemical applications, including lithium-and/or sodium-ion batteries [51,62,66,71,79,84,[96][97][98][99][100], super-or pseudo-capacitors [77,78,83], electrochemical water splitting [59] and sensors [72,81]. The amorphous CoSnO 3 @C nanoboxes reported by Wang et al [79] showed high initial discharge and charge capacities of around 1,410 and 480 mA h g −1 , respectively, as revealed in Fig.…”

Section: Applications Electrochemical Electrode Materialsmentioning

confidence: 99%

“…Kuai et al [59] evaluated the electrocatalytic water splitting performance of amorphous Fe-Ni-O x nanospheres with different Fe/Ni ratios in 1.0 M KOH at room temperature. Fe 6 Ni 10 O x was found to be the best catalyst among the investigated Fe-Ni-O x series, with an overpotential of as low as 0.286 V (10 mA cm −2 ) and Tafel slope of 48 mV decade −1 for the electrochemical oxygen evolution reaction.…”

Section: Science China Materialsmentioning

confidence: 99%

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Tailoring the shape of amorphous nanomaterials: recent developments and applications

2015

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Nanoscale amorphous materials are very important member of the non-crystalline solids family and have emerged as a new category of advanced materials. However, morphological control of amorphous nanomaterials is very difficult because of the atomic isotropy of their internal structures. In this review, we introduce some emerging innovative methods to fabricate well-defined, regular-shaped amorphous nanomaterials. We then highlight some examples to evaluate the use of these amorphous materials in electrodes, and their optical response. There is still plenty of room to explore the amorphous world. As researchers continue to advance the scientific tools that underpin the concepts related to "amorphous", additional applications of these materials will emerge. Their controlled synthesis will undoubtedly attain new heights in the discipline of nanomaterials, and allow nanoscale amorphous materials to become more sophisticated, diverse, and mainstream.

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“…However, a large overpotential is required to overcome the kinetic barrier induced by the high activation energy, and thus to form the reaction intermediates in the system, whatever for an anodic oxygen evolution reaction (OER) and a cathodic hydrogen evolution reaction (HER) [7]. For the practical water spitting, the effective catalysts are needed to decrease the overpotential of the reaction, thus making the process more energy-efficient [8][9][10]. In this regard, the state-of-the art precious metals (Pt, IrO 2 , RuO 2 ) for OER and HER have suffered from the high price and lack of reserves, thus limiting their applications for the overall water splitting [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Cobalt-vanadium bimetal-based nanoplates for efficient overall water splitting

Xiao

Tian

et al. 2017

Sci. China Mater.

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The development of effective and low-cost catalysts for overall water splitting is essential for clean production of hydrogen from water. In this paper, we report the synthesis of cobalt-vanadium (Co-V) bimetal-based catalysts for the effective water splitting. The Co 2 V 2 O 7 ·xH 2 O nanoplates containing both Co and V elements were selected as the precursors. After the calcination under NH 3 atmosphere, the Co 2 VO 4 and Co/VN could be obtained just by tuning the calcination temperature. Electrochemical tests indicated that the Co-V bimetal-based materials could be used as active hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) catalyst by regulating their structure. The Co/VN showed good performance for HER with the onset potential of 68 mV and can achieve a current density of 10 mA cm −2 at an overpotential of 92 mV. Meanwhile, the Co 2 VO 4 exhibited the obvious OER performance with overpotential of 300 mV to achieve a current density of 10 mA cm −2 . When the Co 2 VO 4 and Co/VN were used as the anode and cathode in a twoelectrode system, respectively, the cell needed a voltage of 1.65 V to achieve 10 mA cm −2 together with good stability. This work would be indicative to constructing Co-V bimetalbased catalysts for the catalytic application.

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A Reliable Aerosol‐Spray‐Assisted Approach to Produce and Optimize Amorphous Metal Oxide Catalysts for Electrochemical Water Splitting

Cited by 256 publications

References 32 publications

Recent Progress on Multimetal Oxide Catalysts for the Oxygen Evolution Reaction

Recent Progress on Multimetal Oxide Catalysts for the Oxygen Evolution Reaction

Tailoring the shape of amorphous nanomaterials: recent developments and applications

Cobalt-vanadium bimetal-based nanoplates for efficient overall water splitting

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