Facile and Scalable Synthesis of Self-Supported Zn-Doped CuO Nanosheet Arrays for Efficient Nitrate Reduction to Ammonium

Du, Zhuzhu; Yang, Kai; Du, Hongfang; Li, Boxin; Wang, Ke; He, Song; Wang, Tingfeng; Ai, Wei

doi:10.1021/acsami.2c19011

Cited by 20 publications

(14 citation statements)

References 43 publications

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“…During the anodization process, Cu foil was oxidized to release Cu 2+ for promoting the growth of Cu(OH) 2 nanowire arrays. [ 14 ] The interfacial structure of the as‐grown scaffolds can be readily controlled by tunning the dispersities of nanowire arrays. As shown in the scanning electron microscopy (SEM) images in Figure S1a–c (Supporting Information), when anodizing at 6 mA cm −2 for 100 s, the Cu(OH) 2 nanowire arrays are sparsely grown on the Cu current collectors (S‐Cu(OH) 2 @Cu).…”

Section: Resultsmentioning

confidence: 99%

Integrated Gradient Cu Current Collector Enables Bottom‐Up Li Growth for Li Metal Anodes: Role of Interfacial Structure

Liu

et al. 2023

Advanced Science

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Abstract3D Cu current collectors have been demonstrated to improve the cycling stability of Li metal anodes, however, the role of their interfacial structure for Li deposition pattern has not been investigated thoroughly. Herein, a series of 3D integrated gradient Cu‐based current collectors are fabricated by the electrochemical growth of CuO nanowire arrays on Cu foil (CuO@Cu), where their interfacial structures can be readily controlled by modulating the dispersities of the nanowire arrays. It is found that the interfacial structures constructed by sparse and dense dispersion of CuO nanowire arrays are both disadvantageous for the nucleation and deposition of Li metal, consequently fast dendrite growth. In contrast, a uniform and appropriate dispersity of CuO nanowire arrays enables stable bottom Li nucleation associated with smooth lateral deposition, affording the ideal bottom‐up Li growth pattern. The optimized CuO@Cu‐Li electrodes exhibit a highly reversible Li cycling including a coulombic efficiency of up to ≈99% after 150 cycles and a long‐term lifespan of over 1200 h. When coupling with LiFePO4 cathode, the coin and pouch full‐cells deliver outstanding cycling stability and rate capability. This work provides a new insight to design the gradient Cu current collectors toward high‐performance Li metal anodes.

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Section: Resultsmentioning

confidence: 99%

Integrated Gradient Cu Current Collector Enables Bottom‐Up Li Growth for Li Metal Anodes: Role of Interfacial Structure

Liu

et al. 2023

Advanced Science

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“…It is worth noting that NO 3 RR performance of CuPt(3:1)@hydrogel nanostructures is much higher than several reported bimetallic electrocatalysts (Table S2). ,,,,,,,,− …”

Section: Results and Discussionmentioning

confidence: 99%

Engineering of Bimetallic Cu–Pt Nanostructures for the Electrochemical Ammonia Synthesis via Nitrate Reduction

Kori,

Das

2023

ACS Appl. Eng. Mater.

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The electrochemical nitrate reduction reaction (NO3RR) is an environmentally friendly and low carbon emission method that is attractive for producing high-value added NH3. However, NO3RR experiences poor selectivity and slow kinetics because of its complex reaction intermediates and the complicated process of eight electron transfer. Herein, the Cu-rich bimetallic nanocomposite CuPt on nanofibrillar networks of peptide bolaamphiphile hydrogels is reported as a high-performance NO3RR electrocatalyst for the conversion of NO3 – to NH3 at ambient temperature. The CuPt(3:1)@hydrogel in comparison with the CuPt(1:1)@hydrogel and CuPt(1:3)@hydrogel displays exceptional catalytic performance with a maximum Faradaic efficiency of 72.33% at −0.1 V (vs RHE) and a relatively high NH3 yield of 0.71 mg h–1 mgcat –1 at −0.3 V (vs RHE) in alkaline electrolyte (1 M KOH) containing 100 mM KNO3. The nanofibrillar networks of peptide bolaamphiphiles provide high catalytic active sites and increase proton transfer kinetics, which results in the enhancement of NO3RR performance. The control experiments support that the produced NH3 originated from NO3 – reduction rather than any impurities. The durability tests suggest that the CuPt(3:1)@hydrogel maintains excellent morphological and structural stability after long-term electroreduction. The as-synthesized CuPt nanostructures were characterized by FE-SEM, EDS, HR-TEM, XRD, rheology, and XPS analyses. The current strategy has the potential to create new opportunities for developing nanomaterials that are designed rationally for future electrocatalysts.

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“…[139,140] The incorporation of other elements is effective to tune the electronic property for various applications. [141][142][143] Xu and coworkers reported that Pd-incorporated Cu 2 O octahedra had an improved ammonia yield of 925.11 μg h −1 mg cat −1 at -1.3 V versus RHE with an FE of 96.56% [143] because of the formation of the Cu-Pd dimers and oxygen vacancies. Du et al reported the Zn-doped CuO nanosheets with a greatly improved ammonia yield.…”

Section: Copper Oxidesmentioning

confidence: 99%

Recent Advances in Electrocatalysts for Efficient Nitrate Reduction to Ammonia

Liu

Qiao

Peng

et al. 2023

Adv Funct Materials

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Ammonia as an irreplaceable chemical has been widely demanded to keep the sustainable development of the modern society. However, its industrial production consumes huge energy and releases extraordinary green‐house gases, leading to various environmental issues. To achieve the green production of ammonia is a great challenge that has been extensively pursued recently. In the review, a most promising strategy, electrochemical nitrate reduction reaction (e‐NO3RR) for the purpose is comprehensively investigated to give a full understanding of its development and mechanism and provide guidance for future directions. Particularly, the development of electrocatalysts is focused to realize the high ammonia yield rate and Faraday efficiency for industrial applications. The recent‐developed catalysts, including noble metallic materials, alloys, metal compounds, single‐metal‐atom catalysts, and metal‐free materials, are systematically discussed to review the effects of various factors on the catalytic performance in e‐NO3RR. Accordingly, the strategies, including defects engineering, coordination environment modulating, surface controlling, and hybridization, are carefully discussed to improve the catalytic performance, such as the intrinsic activity and selectivity. Finally, perspectives and challenges are given out. This review shall provide insightful guidance on the development of advanced catalytic systems for the production of green ammonia efficiently in the industry.

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Facile and Scalable Synthesis of Self-Supported Zn-Doped CuO Nanosheet Arrays for Efficient Nitrate Reduction to Ammonium

Cited by 20 publications

References 43 publications

Integrated Gradient Cu Current Collector Enables Bottom‐Up Li Growth for Li Metal Anodes: Role of Interfacial Structure

Integrated Gradient Cu Current Collector Enables Bottom‐Up Li Growth for Li Metal Anodes: Role of Interfacial Structure

Engineering of Bimetallic Cu–Pt Nanostructures for the Electrochemical Ammonia Synthesis via Nitrate Reduction

Recent Advances in Electrocatalysts for Efficient Nitrate Reduction to Ammonia

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