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

Xiao, Yinglu; Tian, Chungui; Tian, Ming; Wu, Aiping; Yan, Haijing; Chen, Congfang; Wang, Lei; Jiao, Yanqing; Fu, Honggang

doi:10.1007/s40843-017-9113-1

Cited by 57 publications

(34 citation statements)

References 63 publications

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“…As an important discharging process, the slow kinetics of oxygen reduction reaction (ORR) limits the overall performance of ZABs by increasing polarization and decreasing energy efficiency [10]. Commercial Pt/C catalysts are recognized as benchmark catalysts for ORR, but their high price and poor selectivity and stability impede their wide applications [11,12]. Based on the above considerations, it is necessary to develop a novel and efficient ORR catalyst originating from earth-abundant and inexpensive elements as a substitute for precious metal catalysts [13].…”

Section: Introductionmentioning

confidence: 99%

Cubic imidazolate frameworks-derived CoFe alloy nanoparticles-embedded N-doped graphitic carbon for discharging reaction of Zn-air battery

Wang

et al. 2019

Sci. China Mater.

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The construction of transition metal-based catalysts with high activity and stability has been widely regarded as a promising method to replace the precious metal Pt for oxygen reduction reaction (ORR). Herein, we synthesized CoFe alloy nanoparticle-embedded N-doped graphitic carbon (CoFe/NC) nanostructures as ORR electrocatalysts. The ZIF-67 (zeolitic imidazolate framework, ZIF) nanocubes were first synthesized, followed by an introduction of Fe 2+ ions to form CoFe-ZIF precursors via a simple ion-exchange route. Subsequently, the CoFe/NC composites were synthesized through a facile pyrolysis strategy. The ORR activity and the contents of cobalt and iron could be effectively adjusted by controlling the solution concentration of Fe 2+ ions used for the ion exchange and the pyrolysis temperature. The CoFe/NC-0.2-900 composite (synthesized with 0.2 mmol of FeSO 4 •7H 2 O at a pyrolysis temperature of 900°C) exhibited ORR activity that was superior to the other samples owing to a synergistic effect of the bimetal, especially considering the extremely high limiting current density of 6.4 mA cm-2 compared with that of Pt/C (5.1 mA cm-2). Rechargeable Zn-air batteries were assembled employing CoFe/NC-0.2-900 and NiFeP/NF (NiFeP supported on nickel foam (NF)) as the catalysts for the discharging and charging processes, respectively, The above materials achieved reduced discharging and charging platforms, high power density, and prolonged cycling stability compared with conventional Pt/C+RuO 2 /C catalysts.

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Section: Introductionmentioning

confidence: 99%

Cubic imidazolate frameworks-derived CoFe alloy nanoparticles-embedded N-doped graphitic carbon for discharging reaction of Zn-air battery

Wang

et al. 2019

Sci. China Mater.

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“…Exploring an efficient and applicable technology for hy-drogen generation to replace traditional fossil fuels is vitally important to relieve the energy crisis and environmental pollution [1][2][3][4][5]. Electrolytic water splitting can be divided into two half-reactions: the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER).…”

Section: Introductionmentioning

confidence: 99%

In situ construction of surface defects of carbon-doped ternary cobalt-nickel-iron phosphide nanocubes for efficient overall water splitting

et al. 2019

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The ternary cobalt-nickel-iron phosphide nanocubes (P-Co 0.9 Ni 0.9 Fe 1.2 NCs) with high intrinsic activity, conductivity, defect concentration and optimized ratio have been realized through a facile phosphorization treatment using ternary cobalt-nickel-iron nanocubes of Prussian blue analogs (PBA) as a precursor. The scanning electron microscopy and transmission electron microscopy results show that the P-Co 0.9 Ni 0.9 Fe 1.2 NCs maintain a cubic structure with a rough surface, implying the rich surface defects as exposed active sites. The thermal phosphorization of the ternary PBA precursor not only provids carbon doping but also leads to the in situ construction of surface defects on the NCs. The carbon doping from the PBA precursor lowers the charge transfer resistance and optimizes the electronic transformation. The synergistic effect among the ternary metal ions and rich defects contributes to the enhanced electrocatalytic performance. The P-Co 0.9 Ni 0.9 Fe 1.2 NCs achieve low overpotentials of −200.7 and 273.1 mV at a current density of 10 mA cm −2 for the hydrogen evolution reaction and the oxygen evolution reaction, respectively. The potential of overall water splitting reaches 1.52 V at a current density of 10 mA cm −2. The longterm stability of the electrocatalysts was also evaluated. This work provides a facile method to design efficient transitionmetal-based bifunctional electrocatalysts for overall water splitting.

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“…With the development of semiconductor photocatalysis [1][2][3][4], semiconductor photocatalysts ushered in a glorious era of the photocatalytic water decomposition of H 2 [5][6][7][8]. Graphitic carbon nitride is currently a prominent semiconductor material that has garnered tremendous attention in academia due to its low cost, environmental friendliness, suitable band structure and impressive physical and chemical stability [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

In Situ Construction of Ag/TiO2/g-C3N4 Heterojunction Nanocomposite Based on Hierarchical Co-Assembly with Sustainable Hydrogen Evolution

et al. 2019

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The construction of heterojunctions provides a promising strategy to improve photocatalytic hydrogen evolution. However, how to fabricate a nanoscale TiO2/g-C3N4 heterostructure and hinder the aggregation of bulk g-C3N4 using simple methods remains a challenge. In this work, we use a simple in situ construction method to design a heterojunction model based on molecular self-assembly, which uses a small molecule matrix for self-integration, including coordination donors (AgNO3), inorganic titanium source (Ti(SO4)2) and g-C3N4 precursor (melamine). The self-assembled porous g-C3N4 nanotube can hamper carrier aggregation and it provides numerous catalytic active sites, mainly via the coordination of Ag+ ions. Meanwhile, the TiO2 NPs are easily mineralized on the nanotube template in dispersive distribution to form a heterostructure via an N–Ti bond of protonation, which contributes to shortening the interfacial carrier transport, resulting in enhanced electron-hole pairs separation. Originating from all of the above synergistic effects, the obtained Ag/TiO2/g-C3N4 heterogenous photocatalysts exhibit an enhanced H2 evolution rate with excellent sustainability 20.6-fold-over pure g-C3N4. Our report provides a feasible and simple strategy to fabricate a nanoscale heterojunction incorporating g-C3N4, and has great potential in environmental protection and water splitting.

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

Cited by 57 publications

References 63 publications

Cubic imidazolate frameworks-derived CoFe alloy nanoparticles-embedded N-doped graphitic carbon for discharging reaction of Zn-air battery

Cubic imidazolate frameworks-derived CoFe alloy nanoparticles-embedded N-doped graphitic carbon for discharging reaction of Zn-air battery

In situ construction of surface defects of carbon-doped ternary cobalt-nickel-iron phosphide nanocubes for efficient overall water splitting

In Situ Construction of Ag/TiO2/g-C3N4 Heterojunction Nanocomposite Based on Hierarchical Co-Assembly with Sustainable Hydrogen Evolution

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