Hierarchical ZnxCo3–xO4 Nanoarrays with High Activity for Electrocatalytic Oxygen Evolution

Liu, Xijun; Chang, Zheng; Luo, Liang; Xu, Tianhao; Lei, Xiaodong; Liu, Junfeng; Sun, Xiaoming

doi:10.1021/cm4040903

Cited by 394 publications

(265 citation statements)

References 63 publications

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“…3). 52 Although the rst redox peaks were not clearly visible, they were described in accordance to the known Co-Zn oxides. 52 However, the next pair of redox peaks (III/IV) in the range of 1.3 to 1.6 V, associated with Co 3+ /Co 4+ , displayed a notable variation.…”

mentioning

confidence: 84%

“…investigated for efficient OER electrocatalysis, 23,39-50 the combination of cobalt and zinc oxide is still very limited and unexplored. Li 52 In addition to this, we designed a self-supported cobalt doped zinc oxide catalyst (Co : ZnO) utilizing a molecular approach for unifying oxidantdriven OER and electrochemical OER, whereas Yang et al reported cobalt zinc oxides for oxidant-driven water oxidation. has been made, no surface structural investigations and structure-activity relationships have been derived so far.…”

Section: -27mentioning

confidence: 99%

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Uncovering the prominent role of metal ions in octahedral versus tetrahedral sites of cobalt–zinc oxide catalysts for efficient oxidation of water

et al. 2016

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The fabrication and design of earth-abundant and high-performance catalysts for the oxygen evolution reaction (OER) are very crucial for the development and commercialization of sustainable energy conversion technologies. Although spinel catalysts have been widely explored for the electrochemical oxygen evolution reaction (OER), the role of two geometrical sites that influence their activities has not been well established so far. Here, we present more effective cobalt-zinc oxide catalysts for the OER than 'classical' Co 3 O 4 . Interestingly, the significantly higher catalytic activity of ZnCo 2 O 4 than that of

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mentioning

confidence: 84%

Section: -27mentioning

confidence: 99%

Uncovering the prominent role of metal ions in octahedral versus tetrahedral sites of cobalt–zinc oxide catalysts for efficient oxidation of water

et al. 2016

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“…Liu et al devised hierarchical Zn x Co 3 -x O 4 nanoarrays through co-deposition of Zn and Cu precursors on Ti foil substrates followed by heat treatment. [128] To determine the optimum ratio of Zn to Co, nanoarrays with Zn/Co ratios of 0.23, 0.31, and 0.48 were synthesized. Among them, the nanoarrays with Zn/Co ratios of 0.31 exhibited the best performance, and several reasons for this behavior were suggested.…”

Section: Wwwadvenergymatdementioning

confidence: 99%

Recent Progress on Multimetal Oxide Catalysts for the Oxygen Evolution Reaction

Kim

et al. 2018

Advanced Energy Materials

651

478

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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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“…The effective structures utilized in the design of superaerophilic electrodes are listed in Table 1. It is found that vertically aligned nanoplates (including Ni, [48,49] Cu 3 P, [50] Cu, [34] RuO 2 @TiO 2 , [51] and NiFe-layered double-hydroxide [52] nanoplates), 3D porous structures (amorphous MoS 2 porous thin films (PTFs) [53] ), nanoarrays composed of pine-shaped (a pine-shaped Pt nanoarray [54] ) or flower-shaped (Ni-Cu alloy nanostructure [55] ) units, and other nanostructures (ZnxCo 3−x O 4 nanoneedles grown on primary rhombus-shaped pillar arrays [56] ) are all ideal structures with which to design superaerophobic electrode interfaces to diminish the negative effects caused by the adhered gas bubbles.…”

Section: Superaerophobic Electrodes and Their Applicationmentioning

confidence: 99%

Superwettability of Gas Bubbles and Its Application: From Bioinspiration to Advanced Materials

et al. 2017

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Gas bubbles in aqueous media are common and inevitable in, for example, agriculture and industrial processes. The behaviors of gas bubbles on solid interfaces, including generation, growth, coalescence, release, transport, and collection, are crucial to gas‐bubble‐related applications, which are always determined by gas‐bubble wettability on solid interfaces. Here, the recent progress regarding the study of interfaces with gas‐bubble superwettability in aqueous media, i.e., superaerophilicity and superaerophobicity, is summarized. Some examples illustrate how to design microstructures and chemical compositions to achieve reliable and effective manipulation of gas‐bubble wettability on artificial interfaces. These designed interfaces exhibit excellent performance in gas‐evolution reactions, gas‐adsorption reactions, and directional gas‐bubble transportation. Moreover, progress in the theoretical investigation of gas‐bubble superwettability is reported. Lastly, some challenges are presented, such as the reliable manipulation of gas‐bubble wettability and the establishment of mature theory for exactly and systematically explaining gas‐bubble wetting phenomena.

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Hierarchical Zn_xCo_3–xO₄ Nanoarrays with High Activity for Electrocatalytic Oxygen Evolution

Abstract: ZnxCo3‐xO4 nanoarrays are grown hydrothermally on Ti foils using appropriate ratios of Zn(NO3)2 and Co(NO3)2, NH4F and Co(NH2)2 in H2O together with the Ti substrate (autoclave, 120 °C, 10 h).

Cited by 394 publications

References 63 publications

Uncovering the prominent role of metal ions in octahedral versus tetrahedral sites of cobalt–zinc oxide catalysts for efficient oxidation of water

Uncovering the prominent role of metal ions in octahedral versus tetrahedral sites of cobalt–zinc oxide catalysts for efficient oxidation of water

Recent Progress on Multimetal Oxide Catalysts for the Oxygen Evolution Reaction

Superwettability of Gas Bubbles and Its Application: From Bioinspiration to Advanced Materials

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