Identification of Cu surface active sites for a complete nitrate-to-nitrite conversion with nanostructured catalysts

Roy, Claudie; Deschamps, Jude; Martin, M.; Bertin, Erwan; Reyter, David; Garbarino, Sébastien; Roué, Lionel; Guay, Daniel

doi:10.1016/j.apcatb.2016.01.043

Cited by 60 publications

(38 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…the priority nucleation and growth of Cu on the surface of Pt(100) [31]. Meanwhile, Cu preferential adsorption on the (100) terraces, the current density of Cu stripping from the (100) terrace is higher than that from the steps, conducing to the higher activity for nitrate transition to nitrite [24]. The slight diminution of the hydrogen desorption states and the overlapping (bi-) sulfate adsorption compared with Pt NFs / CC (black curve in Figure 3B) correspond to the low Cu coverage on the surface of Cu / Pt NFs / CC.…”

Section: Assessment Of Cu Sites and Coverage On Cu/pt Nfs/ccmentioning

confidence: 99%

“…The slight diminution of the hydrogen desorption states and the overlapping (bi-) sulfate adsorption compared with Pt NFs / CC (black curve in Figure 3B) correspond to the low Cu coverage on the surface of Cu / Pt NFs / CC. Cu coverage was calculated from the H desorption charge and Cu stripping charge by integrating the shaded areas depicted in Figure 3B [24]. As a result, Cu / Pt NFs / CC with the coverage of ca.…”

Section: Assessment Of Cu Sites and Coverage On Cu/pt Nfs/ccmentioning

confidence: 99%

“…Accordingly, the bimetallic system based on Pt(100) would require (i) the Pt(100) with extended surface areas that could both anchor the promoter metal atoms and expose enough (100) surface sites for adsorbing the nitrite and (ii) the appropriate coverage of the promoter metal that could achieve selective reduction to N 2 . Considering above, Pt nanostructured materials with a preferential (100) orientation [21][22][23][24] are more favorable for nitrate reduction and highly specific for the N 2 selective formation by decorating a promoter metal, such as the low-cost copper.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Cu Modified Pt Nanoflowers with Preferential (100) Surfaces for Selective Electroreduction of Nitrate

Chen

et al. 2019

Catalysts

View full text Add to dashboard Cite

Improving surface selectivity and maximizing electrode surface area are critical needs for the electroreduction of nitrate. Herein, preferential (100) oriented Pt nanoflowers with an extended surface area were prepared by potentiostatic deposition on carbon cloth (Pt NFs/CC), and then Cu atoms were adsorbed on the Pt NFs (Cu/Pt NFs/CC) for application of nitrate electroreduction. The results reveal that Cu/Pt NFs/CC with 8.7% Cu coverage exhibits a high selectivity for nitrate electroreduction to N2 following two steps: Nitrate firstly converts into nitrite on Cu sites adsorbed on Pt NFs, then nitrite subsequently selective reduction and ammonia oxidation to N2 occur on the large exposed (100) terraces in Pt NFs. In addition, electrocatalytic activity and selectivity of nitrate reduction strongly rely on the Cu surface coverage on Pt NFs, the lower activity of nitrate reduction is displayed with increase of Cu coverage. Accordingly, the selective reduction of nitrate to N2 is feasible at such nanostructured Pt nanoflowers modified with Cu.

show abstract

Section: Assessment Of Cu Sites and Coverage On Cu/pt Nfs/ccmentioning

confidence: 99%

Section: Assessment Of Cu Sites and Coverage On Cu/pt Nfs/ccmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Cu Modified Pt Nanoflowers with Preferential (100) Surfaces for Selective Electroreduction of Nitrate

Chen

et al. 2019

Catalysts

View full text Add to dashboard Cite

show abstract

“…Figure displays the voltammetric profiles for Cu stripping at a pristine Pt surface (a) and at a Ru‐decorated electrode (b), the same featuring in Figure . We recall that six peaks are used in the deconvolution, which, from lower to higher potentials, can be ascribed to defect sites (three peaks), (111) sites, and (100) sites (two peaks, centred at 0.65 and 0.71 V vs RHE, related to narrow and broad domains, respectively) (further details in the Supporting Information). The comparison of panels (a) and (b) shows that:…”

Section: Resultsmentioning

confidence: 99%

“…However, one must bear in mind that a larger error is associated with this method, since there is no generally accepted reference CO stripping charge for Ru−Pt electrodes. Cu underpotential deposition is an alternative procedure that was shown to be particularly suitable for the determination of the surface domains of high‐surface area Pt electrodes . To conduct Cu underpotential deposition, CuSO 4 was added to the electrochemical cell to yield a 2 mM CuSO 4 solution.…”

Section: Methodsmentioning

confidence: 99%

Promotion of Glycerol Oxidation by Selective Ru Decoration of (100) Domains at Nanostructured Pt Electrodes

et al. 2019

View full text Add to dashboard Cite

Glycerol (GlOH) electrooxidation is a potential route to GlOH valorisation. In this work, we show that GlOH oxidation can be enhanced at bimetallic PtÀ Ru electrodes with respect to bare Pt in sulphuric acid. We electrodeposited high-surface area Pt electrodes comprising of 40 % (100) sites, along with a smaller amount of (111) domains. Spontaneous Ru deposition was carried out by immersion in a RuCl 3 solution for a varying amount of time. Voltammetric methods demonstrated that (100) sites are decorated most readily. PtÀ Ru electrodes display an earlier onset potential for CO ads oxidation, which translates into an anticipation of the main GlOH oxidation wave. Under prolonged Ru deposition, Ru decoration also proceeds close to (111) Pt domains, as highlighted by CO stripping. We suggest that such ensembles may play a critical role in achieving optimal GlOH activity at PtÀ Ru.

show abstract

A Perspective on Cu‐Based Electrocatalysts for Nitrate Reduction for Ammonia Synthesis

Wei,

Li,

Wang

et al. 2023

Adv Energy and Sustain Res

View full text Add to dashboard Cite

Compared to the Haber–Bosch (H–B) process for ammonia synthesis with massive emission of greenhouse CO2 and necessary harsh reaction conditions, the electrocatalytic NO3− reduction (NO3RR) for ammonia synthesis under ambient temperature and pressure driven by renewable electricity has attracted great attention. NO3RR is also a promising route to construct nitrogen cycles utilizing NOx produced from industrial and agricultural operations. Cu‐based catalyst is one of the most promising platforms for this reaction. This perspective shows the latest understanding and research advances on the NO3RR by Cu‐based electrocatalysts. Through a deep analysis on the rate‐limiting step of NO3RR, the strategies of overcoming the deactivation and enhancing the performance of Cu‐based catalysts are discussed. The great significance of synergistic NOx and H activation in promoting the key kinetic step of electrocatalytic NO3RR by single‐atom, oxide, bimetallic of Cu on the catalytic reaction site construction with tunable adsorption of N‐containing intermediate and active H is stressed. Also, future challenges and perspectives toward coupling reaction of nitrate reduction catalyzed by Cu‐based catalysts are proposed. This perspective can move forward the future research on electrocatalytic NO3RR to ammonia synthesis over advanced Cu‐based electrocatalysts.

show abstract

Identification of Cu surface active sites for a complete nitrate-to-nitrite conversion with nanostructured catalysts

Cited by 60 publications

References 46 publications

Cu Modified Pt Nanoflowers with Preferential (100) Surfaces for Selective Electroreduction of Nitrate

Cu Modified Pt Nanoflowers with Preferential (100) Surfaces for Selective Electroreduction of Nitrate

Promotion of Glycerol Oxidation by Selective Ru Decoration of (100) Domains at Nanostructured Pt Electrodes

A Perspective on Cu‐Based Electrocatalysts for Nitrate Reduction for Ammonia Synthesis

Contact Info

Product

Resources

About