Stable PtNb-Nb2O5 heterostructure clusters @CC for high-current-density neutral seawater hydrogen evolution

Nie, Nanzhu; Zhang, Dan; Wang, Zuochao; Yu, Wenhao; Ge, Shijie; Xiong, Juan; Gu, Yanli; Yang, Bo; Lai, Jianping; Wang, Lei

doi:10.1016/j.apcatb.2022.121808

Cited by 24 publications

(22 citation statements)

References 60 publications

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“…Breaking the H-O-H bond to provide a proton requires higher energy than breaking the H 3 O + ion, which readily gives a proton in an acidic medium. Therefore, the HER rate in an alkaline or neutral medium is lower than that in an acidic medium (Hao et al, 2018;Nie et al, 2022;Zhang et al, 2023).…”

Section: Reaction Mechanismsmentioning

confidence: 98%

“…Also, the electrocatalysts’ stability in an aqueous environment and alkaline electrolyte was improved significantly ( Bates et al, 2015 ; Cho et al, 2018 ). Compared to other mixed metal-based ceramic materials, heterostructured MMO is also one of the potential approaches as an affordable electrocatalyst for industrial applications due to its facile synthesis method and lower noble metal loading amount ( Seuferling et al, 2021 ; Nie et al, 2022 ; Pagliaro et al, 2022 ). However, there is still no clear guideline for use of MMOs as HER electrocatalysts.…”

Section: Introductionmentioning

confidence: 99%

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Heterostructured mixed metal oxide electrocatalyst for the hydrogen evolution reaction

2023

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The hydrogen evolution reaction (HER) has attracted considerable attention lately because of the high energy density and environmental friendliness of hydrogen energy. However, lack of efficient electrocatalysts and high price hinder its wide application. Compared to a single-phase metal oxide catalyst, mixed metal oxide (MMO) electrocatalysts emerge as a potential HER catalyst, especially providing heterostructured interfaces that can efficiently overcome the activation barrier for the hydrogen evolution reaction. In this mini-review, several design strategies for the synergistic effect of the MMO catalyst on the HER are summarized. In particular, metal oxide/metal oxide and metal/metal oxide interfaces are explained with fundamental mechanistic insights. Finally, existing challenges and future perspectives for the HER are discussed.

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Section: Reaction Mechanismsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Heterostructured mixed metal oxide electrocatalyst for the hydrogen evolution reaction

2023

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“…Also, the current research studies on seawater electrolysis are mainly under strong alkaline conditions (pH = 14) due to technical and material limitations. Such conditions require constant flushing of the electrolysis cell with lye and fresh seawater to maintain a constant pH, which may increase the associated costs . Therefore, developing a low-cost, highly efficient, and safe direct seawater electrolysis technology for hydrogen production is challenging and of great importance.…”

Section: Introductionmentioning

confidence: 99%

“…Such conditions require constant flushing of the electrolysis cell with lye and fresh seawater to maintain a constant pH, which may increase the associated costs. 7 Therefore, developing a low-cost, highly efficient, and safe direct seawater electrolysis technology for hydrogen production is challenging and of great importance.…”

Section: ■ Introductionmentioning

confidence: 99%

Coupling Ferrocyanide-Assisted PW/PB Redox with Efficient Direct Seawater Electrolysis for Hydrogen Production

et al. 2023

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Direct seawater electrolysis is a promising approach for grid-scale hydrogen mass production. However, the low energy efficiency and detrimental anodic chlorine electrochemistry unlock its practical potential. Here, we present an efficient chlorine-free hydrogen production by coupling the rapid electrode reaction of ferrocyanide-assisted Prussian white (PW)/Prussian blue (PB) redox with an onset potential of 0.87 V RHE . The chloride oxidation in our cells is avoided by low cell voltages, enabling high-purity hydrogen production. Operando spectroscopic analysis coupled with theoretical calculations validates that the addition of the [Fe(CN) 6 ] 3−/4− redox mediator in the electrolyte can reduce the PB to PW instantaneously, thus completing the cycle of PW/ PB redox and making the system recyclable. The assembled electrolyzer exhibited unprecedented performance for direct seawater electrolysis (pH = 8.5), achieving a current density of 320 mA cm −2 at 1.7 V. Therefore, the electricity consumed per cubic meter of H 2 produced in the electrolyzer is 3.8 kWh at 200 mA cm −2 , and 42% lower energy equivalent input relative to commercial redoxfree seawater electrolysis. This work offers a cost-competitive and energy-saving strategy for producing high-purity H 2 directly from unlimited seawater.

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“…Nb 2 O 5 is proven to have excellent adsorption capability for OH ad . 23,24 In addition, Nb state of Nb, 25 which has good corrosion resistance. Nb 2 O 5 can alleviate the migration and agglomeration of metal particles to improve stability by strengthening its interaction with metal nanoparticles.…”

Section: ■ Introductionmentioning

confidence: 99%

Interface Engineering of PtZn Alloy and Nb₂O₅ for Promoting Ammonia Oxidation Reaction and Hydrogen Evolution Reaction

Tan,

Yu,

Zhai

et al. 2023

Langmuir

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Ammonia electrolysis is a promising technology to obtain green hydrogen with zero-carbon emission, in which ammonia oxidation reaction (AOR) and hydrogen evolution reaction (HER) occur at the anode and cathode, respectively. However, the lack of efficient catalysts hinders its practical application. Herein, PtZn alloy is combined with Nb 2 O 5 to construct a bifunctional heterostructure catalyst (PtZn-Nb 2 O 5 /C). The optimal sample with Nb 2 O 5 content of 7.05 wt % demonstrates the best performance with a peak current density of 304.1 mA mg −1 Pt for AOR, and it is only reduced by 17.0% after 4000 cycles of durability tests. For HER, it has a low overpotential of 34 mV at −10 mA cm −2 under the alkaline condition. This can be ascribed to the interfacial interaction between the PtZn alloy and Nb 2 O 5 , which adjusts the adsorption behavior of OH ad to concurrently promote AOR and HER activity. This work thus proposes a viable strategy to design an efficient bifunctional catalyst for hydrogen generation from ammonia electrolysis.

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Stable PtNb-Nb2O5 heterostructure clusters @CC for high-current-density neutral seawater hydrogen evolution

Cited by 24 publications

References 60 publications

Heterostructured mixed metal oxide electrocatalyst for the hydrogen evolution reaction

Heterostructured mixed metal oxide electrocatalyst for the hydrogen evolution reaction

Coupling Ferrocyanide-Assisted PW/PB Redox with Efficient Direct Seawater Electrolysis for Hydrogen Production

Interface Engineering of PtZn Alloy and Nb₂O₅ for Promoting Ammonia Oxidation Reaction and Hydrogen Evolution Reaction

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Stable PtNb-Nb2O5 heterostructure clusters @CC for high-current-density neutral seawater hydrogen evolution

Cited by 24 publications

References 60 publications

Heterostructured mixed metal oxide electrocatalyst for the hydrogen evolution reaction

Heterostructured mixed metal oxide electrocatalyst for the hydrogen evolution reaction

Coupling Ferrocyanide-Assisted PW/PB Redox with Efficient Direct Seawater Electrolysis for Hydrogen Production

Interface Engineering of PtZn Alloy and Nb2O5 for Promoting Ammonia Oxidation Reaction and Hydrogen Evolution Reaction

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Product

Resources

About

Interface Engineering of PtZn Alloy and Nb₂O₅ for Promoting Ammonia Oxidation Reaction and Hydrogen Evolution Reaction