Versatile nanoporous bimetallic phosphides towards electrochemical water splitting

Tan, Yongwen; Wang, Hao; Chen, Mingwei; Shen, Yuhao; Chen, Luyang; Hirata, Akihiko; Fujita, Takeshi; Tang, Zheng

doi:10.1039/c6ee01109h

Cited by 542 publications

(346 citation statements)

References 50 publications

(55 reference statements)

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“…Note that samples with lower Fe content show higher crystallinity. [39] As shown in Figure 4a, XPS analysis of the Co 1-x Fe x WO 4 ÀCNT exhibits the presence of the Co, Fe, C, O and W. Figure 4b and 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 4c demonstrate the presence of Co 2 + , Co 3 + , Fe 2 + and Fe 3 + . Furthermore, the (120) peak showed in XRD patterns ( Figure S2 The chemical composition and electronic structure of the Co 1-x Fe x WO 4 ÀCNT composites were examined by X-ray photoelectron spectroscopy (XPS, Figure S4).…”

Section: Resultsmentioning

confidence: 99%

Composite Metal Oxide‐Carbon Nanotube Electrocatalysts for the Oxygen Evolution and Oxygen Reduction Reactions

Luo

Wang

et al. 2018

ChemElectroChem

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Electrocatalysts capable of performing both the oxygen evolution reaction (OER) and the oxygen reduction reaction (ORR) are key components for energy technologies including fuel cells, and water electrolysis. High-performance catalysts based on earth abundant components are therefore a prime research theme. Herein, we report the development of a series of novel composites based on nanostructured iron-doped CoWO 4 particles electrically linked to conductive carbon nanotubes (CNTs) using a facile one-pot hydrothermal method. It is shown that tuning of the iron content of Co 1-x Fe x WO 4 ÀCNT composites (x = 0-1) allows structural and reactivity control. The Co 1-x Fe x WO 4 ÀCNT composites are active and stable OER and ORR electrocatalysts, and follow the Sabatier principle. For Co 0.5 Fe 0.5 WO 4 ÀCNT, minimum overpotentials of h = 290 mV and low Tafel slopes of 42 mV dec À1 are achieved at a current density of j = 10 mA cm À2 for OER, and the Co 0.5 Fe 0.5 WO 4 ÀCNT shows high catalytic activity for ORR with half-wave potential of 0.74 V. As such, the composites show high potential as OER and ORR electrocatalysts, so that technologically viable, noble-metal-free, tunable electrocatalysts with relevance for alkaline water electrolysis can be designed from the bottom up.

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Section: Resultsmentioning

confidence: 99%

Composite Metal Oxide‐Carbon Nanotube Electrocatalysts for the Oxygen Evolution and Oxygen Reduction Reactions

Luo

Wang

et al. 2018

ChemElectroChem

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“…As such, Lou and co‐workers synthesized porous nickel phosphides nanoplates with carbon coating from Ni–Ni Prussian blue analog nanoplates and further confirmed that the obtained nickel phosphide possessed exceptional electrocatalytic OER activity superior to nickel oxide/hydroxide with similar morphology . To date, several efficient strategies including making porous nanostructures, adopting multimetallic catalysts by taking advantage of synergistic metal–metal interactions, and introducing carbon materials as favorable supports have been established to rationally engineer their structures and composition to further enhance OER performance. For example, our group focused on these critical issues and developed some promising bimetallic phosphides with porous nanostructures, such as highly ordered mesoporous CoNiP with large pore size and metal–organic framework (MOF)‐derived cobalt‐based bimetallic phosphide .…”

Section: Introductionmentioning

confidence: 94%

Sugar Blowing‐Induced Porous Cobalt Phosphide/Nitrogen‐Doped Carbon Nanostructures with Enhanced Electrochemical Oxidation Performance toward Water and Other Small Molecules

Zhu

et al. 2017

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Rational design of high active and robust nonprecious metal catalysts with excellent catalytic efficiency in oxygen evolution reaction (OER) is extremely vital for making the water splitting process more energy efficient and economical. Among these noble metal-free catalysts, transition-metal-based nanomaterials are considered as one of the most promising OER catalysts due to their relatively low-cost intrinsic activities, high abundance, and diversity in terms of structure and morphology. Herein, a facile sugar-blowing technique and low-temperature phosphorization are reported to generate 3D self-supported metal involved carbon nanostructures, which are termed as Co P@Co/nitrogen-doped carbon (Co P@Co/N-C). By capitalizing on the 3D porous nanostructures with high surface area, homogeneously dispersed active sites, the intimate interaction between active sites, and 3D N-doped carbon, the resultant Co P@Co/N-C exhibits satisfying OER performance superior to CoO@Co/N-C, delivering 10 mA cm at overpotential of 0.32 V. It is worth noting that in contrast to the substantial current density loss of RuO , Co P@Co/N-C shows much enhanced catalytic activity during the stability test and a 1.8-fold increase in current density is observed after stability test. Furthermore, the obtained Co P@Co/N-C can also be served as an excellent nonprecious metal catalyst for methanol and glucose electrooxidation in alkaline media, further extending their potential applications.

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catalysts with low-cost and earth-abundant materials. [10][11][12][13] Most state-of-the-art water splitting catalyst researches have been focused on the development of nonprecious metal catalysts that are competitive to precious metals. Nevertheless, practical utilization of these electrodes in an integrated electrolysis device has been hindered since the HER and OER catalysts usually require very different pH values in order to produce long lifetimes and high activities.

…”

mentioning

confidence: 99%

All‐In‐One Perovskite Catalyst: Smart Controls of Architecture and Composition toward Enhanced Oxygen/Hydrogen Evolution Reactions

Hua

Zhang

et al. 2017

Advanced Energy Materials

137

106

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catalysts with low-cost and earth-abundant materials. [5][6][7][8][9][10] In terms of achieving the best performances, the HER is usually carried out in an acidic environment while the OER in an alkaline condition. Nevertheless, practical utilization of these electrodes in an integrated electrolysis device has been hindered since the HER and OER catalysts usually require very different pH values in order to produce long lifetimes and high activities. In this context, a bifunctional electrocatalyst with high activities for both the OER and HER in an identical condition is desired. [10][11][12][13] Most state-of-the-art water splitting catalyst researches have been focused on the development of nonprecious metal catalysts that are competitive to precious metals. [5][6][7][8][9][10][14][15][16][17][18] As a result, perovskites are being spotlighted as promising candidates due to their favorable compositional flexibility and good stability in a wide range of electrochemical window, thus enabling easy modification of their catalytic properties. Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3-δ (BSCF) has been introduced as an excellent OER catalyst, whose catalytic activity for water oxidation is one order higher than that of IrO 2 in alkaline conditions. [16][17][18] Furthermore, Xu et al. proved BSCF is capable of catalyzing HER in alkaline conditions. [15] They also found that its HER catalytic performance and durability can be drastically improved via proper A-site Pr-doping. Nevertheless, surface amorphous phases in Pr-doped BSCF were still found after the durability test. It was reported that a smaller size mismatch between the host and dopant cations in the A-site has a remarkable effect on rationalizing the stabilities and activities of cubic BSCF. [19,20] Consequently, we predict that the La-doped BSCF would possess better robustness than Pr-doped BSCF (note that the sequence of ion radiuses is Ca 2+

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Versatile nanoporous bimetallic phosphides towards electrochemical water splitting

Abstract: Nanoporous bimetallic (Co1−xFex)2P phosphides with tuneable Co/Fe ratios exhibit versatile catalytic activities for highly efficient electrochemical water splitting.

Cited by 542 publications

References 50 publications

Composite Metal Oxide‐Carbon Nanotube Electrocatalysts for the Oxygen Evolution and Oxygen Reduction Reactions

Composite Metal Oxide‐Carbon Nanotube Electrocatalysts for the Oxygen Evolution and Oxygen Reduction Reactions

Sugar Blowing‐Induced Porous Cobalt Phosphide/Nitrogen‐Doped Carbon Nanostructures with Enhanced Electrochemical Oxidation Performance toward Water and Other Small Molecules

All‐In‐One Perovskite Catalyst: Smart Controls of Architecture and Composition toward Enhanced Oxygen/Hydrogen Evolution Reactions

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