Insights on the Proton Insertion Mechanism in the Electrode of Hexagonal Tungsten Oxide Hydrate

Jiang, Heng; Hong, Jessica J.; Wei, Xian‐Yong; Surta, T. Wesley; Qi, Yitong; Dong, Shengyang; Li, Zhifei; Leonard, Daniel P.; Holoubek, John; Wong, Jane C.; Razink, Joshua J.; Zhang, Xiaogang; Ji, Xiulei

doi:10.1021/jacs.8b03959

Cited by 140 publications

(148 citation statements)

References 46 publications

(18 reference statements)

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“…Nonmetallic cations, e.g., proton (H + ), hydronium (H 3 O + ), and ammonium (NH 4 + ) ions, have rarely been regarded as charge carriers in aqueous battery chemistry for research and commercial applications, [ 1–3 ] where the mainstream attention located at the metal cations, such as Li + , Na + , Zn 2+ , and Al 3+ ions. [ 4–8 ] Most recently, Ji and co‐workers have pioneeringly reported several typical aqueous batteries utilizing H + and NH 4 + as charging carriers with outstanding electrochemical performance, especially for the ultrafast kinetics with high power density.…”

Section: Figurementioning

confidence: 99%

Initiating Hexagonal MoO₃ for Superb‐Stable and Fast NH₄⁺ Storage Based on Hydrogen Bond Chemistry

et al. 2020

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Nonmetallic ammonium (NH4+) ions are applied as charge carriers for aqueous batteries, where hexagonal MoO3 is initially investigated as an anode candidate for NH4+ storage. From experimental and first‐principle calculated results, the battery chemistry proceeds with reversible building–breaking behaviors of hydrogen bonds between NH4+ and tunneled MoO3 electrode frameworks, where the ammoniation/deammoniation mechanism is dominated by nondiffusion‐controlled pseudocapacitive behavior. Outstanding electrochemical performance of MoO3 for NH4+ storage is delivered with 115 mAh g−1 at 1 C and can retain 32 mAh g−1 at 150 C. Furthermore, it remarkably exhibits ultralong and stable cyclic performance up to 100 000 cycle with 94% capacity retention and high power density of 4170 W kg−1 at 150 C. When coupled with CuFe prussian blue analogous (PBA) cathode, the full ammonium battery can deliver decent energy density 21.3 Wh kg−1 and the resultant flexible ammonium batteries at device level are also pioneeringly developed for potential realistic applications.

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Section: Figurementioning

confidence: 99%

Initiating Hexagonal MoO₃ for Superb‐Stable and Fast NH₄⁺ Storage Based on Hydrogen Bond Chemistry

et al. 2020

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“…[16] Thec athodic/anodic peaks at 0.199 Vand 0.291 V, respectively,show the behavior of the hydrogen insertion/extraction in the WO 3Àx surface (Figure 4a). [17] Thehydrogen insertion/extraction behavior is expressed by this Equation (1):…”

mentioning

confidence: 99%

Investigation of the Support Effect in Atomically Dispersed Pt on WO_3−x for Utilization of Pt in the Hydrogen Evolution Reaction

et al. 2019

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Single-atom catalysts (SACs) have attracted growing attention because they maximizet he number of active sites, with unpredictable catalytic activity.Despite numerous studies on SACs,t here is little researcho nt he support, which is essential to understanding SAC. Herein, we systematically investigated the influence of the support on the performance of the SACb yc omparing with single-atom Pt supported on carbon (Pt SA/C) and Pt nanoparticles supported on WO 3Àx (Pt NP/WO 3Àx ). The results revealed that the support effect was maximized for atomically dispersed Pt supported on WO 3Àx (Pt SA/WO 3Àx ). The Pt SA/WO 3Àx exhibited ahigher degree of hydrogen spillover from Pt atoms to WO 3Àx at the interface, compared with Pt NP/WO 3Àx ,w hichd rastically enhanced Pt mass activity for hydrogen evolution (up to 10 times). This strategy provides an ew framework for enhancing catalytic activity for HER, by reducing noble metal usage in the field of SACs.Hydrogen is being pursued as af uture alternative to fossil fuels and an ideal energy carrier for renewable energy, because it has the highest energy density per mass without any pollutants.Currently,hydrogen production is primarily based on the steam reforming of fossil fuels,w hich is accompanied by environmental issues,s uch as as ubstantial increase in atmospheric CO 2 .Accordingly,itisnecessary to find sustainable and clean alternatives. [1] Electrochemical water splitting is considered ap otentially cost-effective and promising approach for clean hydrogen production. [2] Fort he cathodic hydrogen evolution reaction (HER), platinum (Pt)-based materials are known to the most active electrocatalysts,b ut the high cost and scarcity of Pt are key obstacles to commercial applications of water electrolyzers. [3] Hitherto,n umerous design strategies have been developed for nanostructured electrocatalysts to obtain outstanding electrochemical performance. [4] These strategies are shown to improve the utilization of Pt, and thereby to reduce the use of Pt. Fore xamples,c ore-shell [5] and hollow structures [6] can significantly improve Pt utilization by diminishing the buried non-active Pt atoms inside the particles. From this point of view,single-atom catalysts (SACs), where all metal species are individually dispersed on ad esired support, could be the best candidates to meet this goal, because they offer the maximum number of surface exposed Pt atoms.S everal studies have also demonstrated that Pt SACs show greatly boosted Pt mass activity compared to commercial Pt/C.However,research that considers the effect of the support on SACs performance for the HER is rarely found. [3,7] Thec hoice of support material is one of the most promising strategies for improving (electro)catalysis because interactions between the metal and support can drastically tune the electronic structure of the supported metal, and enhance performance. [8] Furthermore,i th as been recently reported that HER performance can be improved by not only changing the electronic structure of the supported m...

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“…b) Ex situ XRD patterns collected at different SOC in (a) “Ch” and “Dch” represent charge and discharge, respectively. The peak at ≈18° belongs to the binder of polytetrafluoroethylene (PTFE); [ 34 ] XPS spectra of c) Zn 2p and d) V 2p at selected SOC.…”

Section: Resultsmentioning

confidence: 99%

A Na₃V₂(PO₄)₂O_1.6F_1.4 Cathode of Zn‐Ion Battery Enabled by a Water‐in‐Bisalt Electrolyte

Jiang

Sandstrom

et al. 2020

Adv Funct Materials

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Aqueous zinc‐ion batteries are receiving increasing attention; however, the development of high‐voltage cathodes is limited by the narrow voltage window of conventional aqueous electrolytes. Herein, it is reported that Na3V2(PO4)2O1.6F1.4 exhibits the excellent performance, optimal to date, among polyanion cathode materials in a novel neutral water‐in‐bisalts electrolyte of 25 m ZnCl2 + 5 m NH4Cl. It delivers a reversible capacity of 155 mAh g−1 at 50 mA g−1, a high average operating potential of ≈1.46 V, and stable cyclability of 7000 cycles at 2 A g−1.

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Insights on the Proton Insertion Mechanism in the Electrode of Hexagonal Tungsten Oxide Hydrate

Cited by 140 publications

References 46 publications

Initiating Hexagonal MoO₃ for Superb‐Stable and Fast NH₄⁺ Storage Based on Hydrogen Bond Chemistry

Initiating Hexagonal MoO₃ for Superb‐Stable and Fast NH₄⁺ Storage Based on Hydrogen Bond Chemistry

Investigation of the Support Effect in Atomically Dispersed Pt on WO_3−x for Utilization of Pt in the Hydrogen Evolution Reaction

A Na₃V₂(PO₄)₂O_1.6F_1.4 Cathode of Zn‐Ion Battery Enabled by a Water‐in‐Bisalt Electrolyte

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Insights on the Proton Insertion Mechanism in the Electrode of Hexagonal Tungsten Oxide Hydrate

Cited by 140 publications

References 46 publications

Initiating Hexagonal MoO3 for Superb‐Stable and Fast NH4+ Storage Based on Hydrogen Bond Chemistry

Initiating Hexagonal MoO3 for Superb‐Stable and Fast NH4+ Storage Based on Hydrogen Bond Chemistry

Investigation of the Support Effect in Atomically Dispersed Pt on WO3−x for Utilization of Pt in the Hydrogen Evolution Reaction

A Na3V2(PO4)2O1.6F1.4 Cathode of Zn‐Ion Battery Enabled by a Water‐in‐Bisalt Electrolyte

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Product

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Initiating Hexagonal MoO₃ for Superb‐Stable and Fast NH₄⁺ Storage Based on Hydrogen Bond Chemistry

Initiating Hexagonal MoO₃ for Superb‐Stable and Fast NH₄⁺ Storage Based on Hydrogen Bond Chemistry

Investigation of the Support Effect in Atomically Dispersed Pt on WO_3−x for Utilization of Pt in the Hydrogen Evolution Reaction

A Na₃V₂(PO₄)₂O_1.6F_1.4 Cathode of Zn‐Ion Battery Enabled by a Water‐in‐Bisalt Electrolyte