Sensing trace arsenate by surface enhanced Raman scattering using a FeOOH doped dendritic Ag nanostructure

Pradhan, Mukul; Maji, Siddhartha; Sinha, Arun K.; Dutta, Soumen; Pal, Tarasankar

doi:10.1039/c5ta01427a

Cited by 28 publications

(9 citation statements)

References 53 publications

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“…As shown in Figure S21, there are five peaks, located at around 243, 300, 398, 498, and 691 cm −1 , respectively, all of which show a slight shift compared with those of the literaturereported FeOOH. 20,22,70,71 In addition, the characteristic bands ascribed to Ni-based vibration modes are not detected. This result suggests that the Ni atoms also exist in a doping form in the in situ formed FeOOH.…”

Section: Resultsmentioning

confidence: 98%

Arousing the Reactive Fe Sites in Pyrite (FeS₂) via Integration of Electronic Structure Reconfiguration and in Situ Electrochemical Topotactic Transformation for Highly Efficient Oxygen Evolution Reaction

et al. 2019

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Despite significant advances in the development of highly efficient and robust oxygen evolution reaction (OER) electrocatalysts to replace noble-metal catalysts, commercializing OER catalysts with high catalytic activity for sustainable development still remains a great challenge. Especially, transition-metal Fe-based OER catalysts, despite their earth-abundant, cost-efficient, and environmentally benign superiorities over Co-and Ni-based materials, have received relatively insufficient attention because of their poor apparent OER activities. Herein, by rational design, we report Ni-modified pyrite (FeS 2 ) spheres with yolk−shell structure that could serve as pre-electrocatalyst precursors to induce a highly active nickel−iron oxyhydroxide via in situ electrochemical topological transformation under the OER process. Notably, as confirmed by the results of X-ray absorption spectroscopy, X-ray photoelectron spectroscopy, and density functional theory (DFT) calculations, Ni doping could effectively regulate the intrinsic electronic structure of FeS 2 to realize a semiconductor-to-semimetal transition, which endows FeS 2 with dramatically improved conductivity and water adsorption ability, providing prequisites for subsequent topological transformation. Moreover, systematic post-characterizations further reveal that the optimal Ni-FeS 2 -0.5 sample completely converts to amorphous Nidoped FeOOH via an in situ electrochemical transformation with yolk−shell structure well-preserved under the OER conditions. The electronic structure modulation combined with electrochemical topotactic transformation strategies well stimulate the reactive Fe sites in Ni-FeS 2 -0.5, which show impressively low overpotentials of 250 and 326 mV to drive the current densities (j) of 10 and 100 mA cm −2 , respectively, and a Tafel slope as small as 34 mV dec −1 for the OER process. When assembled as a water electrolyzer for the overall water splitting, Ni-FeS 2 -0.5 can display a low voltage of 1.55 V to drive a current density of 10 mA cm −2 , outperforming most of the transition-metal-based bifunctional electrocatalysts to date. This work may provide new insight into the rational design of other high-performance Fe-based OER electrocatalysts and inspire the exploration of cost-effective, ecofriendly electrocatalysts to meet the demand for future sustainable development.

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Section: Resultsmentioning

confidence: 98%

Arousing the Reactive Fe Sites in Pyrite (FeS₂) via Integration of Electronic Structure Reconfiguration and in Situ Electrochemical Topotactic Transformation for Highly Efficient Oxygen Evolution Reaction

et al. 2019

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“…The predominant peak positions in the FTIR (Figure S15a) and Raman (Figure S15b) spectra of CoFe(dobpdc)-I to CoFe(dobpdc)-III nanorods remained largely unchanged after the long-term OER. However, several new peaks corresponding to the vibrations from FeOOH and CoOOH were found: Co–O (546 and 569 cm –1 ), Fe–O (439 cm –1 ), Co–OH (661 cm –1 ), and Fe–OH (863 cm –1 ) in the FTIR spectra − and Fe–O (465 cm –1 ), Co–O (545 and 676 cm –1 ), Co–OH (501 and 577 cm –1 ), and Fe–OH (807 cm –1 ) in the Raman spectra. − The XPS spectra of CoFe(dobpdc)-I to CoFe(dobpdc)-III nanorods after the long-term OER are shown in Figure S16. New binding energies at 780.28, 795.78, 713.78, and 726.48 eV in the Co 2p 3/2 , Co 2p 1/2 , Fe 2p 3/2 , and Fe 2p 1/2 spectra (Figure S16b,c) confirm the presence of CoOOH (or Co(OH) 2 ) and FeOOH. − In addition, a very small peak at a binding energy of 534.58 eV can be identified as −OH in the O 1s spectra (Figure S16e), which indicates the formation of oxyhydroxide after OER .…”

Section: Resultsmentioning

confidence: 99%

Orientation-Adjustable Metal–Organic Framework Nanorods for Efficient Oxygen Evolution Reaction

Yeh

Jiang

et al. 2021

ACS Appl. Mater. Interfaces

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A series of orientation-adjustable metal–organic framework (MOF) nanorods, CoFe(dobpdc)-I to CoFe(dobpdc)-III (dobpdc = 4,4′-dihydroxybiphenyl-3,3′-dicarboxylate), is developed on a 3D nickel foam (NF) template. By modulating the solvent composition for synthesis, the feature of MOF nanorods on the template can be varied from disorganized to a unidirectional orientation perpendicular to the NF. Well-aligned, vertically oriented CoFe(dobpdc)-III nanorods are hydrophilic and have more exposed active sites and interfacial charge transfer ability. Consequently, they exhibit a superior activity for oxygen evolution reaction (OER) with ultralow overpotentials of 176 and 240 mV at 10 and 300 mA cm–2 in 1.0 M KOH (aq), respectively. CoFe(dobpdc)-III also shows a record low overpotential of 204 mV at J 10 mA cm–2 among the electrocatalysts based on CoFe MOF and an excellent overpotential at a high current density (100 mA cm–2) of 312 mV in 0.1 M KOH (aq). This is the first report of a convenient method to straighten up MOF nanorods on a template for highly efficient OER.

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“…However, quenching in the SERS response of arsenic was noticed in the presence of other competing ions. Similarly Pal's group 246 developed efficient SERS active dendritic Ag substrates by simple galvanic replacement reaction using resin immobilized Cu(0) or Fe(0) nanoparticles and AgNO 3 . During the reaction, FeOOH is incorporated in the dendritic Ag nanostructure.…”

Section: Sensor Based Techniquesmentioning

confidence: 99%

Analytical methods for sensing of health-hazardous arsenic from biotic and abiotic natural resources

2015

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Sensing trace arsenate by surface enhanced Raman scattering using a FeOOH doped dendritic Ag nanostructure

Abstract: SERS based arsenic detection at ∼10−10 M level with a FeOOH doped (3.5%) uniform dendritic Ag nanostructure. Area mapping shows the uniformity of the SERS substrate taking arsenate as the probe molecule.

Cited by 28 publications

References 53 publications

Arousing the Reactive Fe Sites in Pyrite (FeS₂) via Integration of Electronic Structure Reconfiguration and in Situ Electrochemical Topotactic Transformation for Highly Efficient Oxygen Evolution Reaction

Arousing the Reactive Fe Sites in Pyrite (FeS₂) via Integration of Electronic Structure Reconfiguration and in Situ Electrochemical Topotactic Transformation for Highly Efficient Oxygen Evolution Reaction

Orientation-Adjustable Metal–Organic Framework Nanorods for Efficient Oxygen Evolution Reaction

Analytical methods for sensing of health-hazardous arsenic from biotic and abiotic natural resources

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Sensing trace arsenate by surface enhanced Raman scattering using a FeOOH doped dendritic Ag nanostructure

Abstract: SERS based arsenic detection at ∼10−10 M level with a FeOOH doped (3.5%) uniform dendritic Ag nanostructure. Area mapping shows the uniformity of the SERS substrate taking arsenate as the probe molecule.

Cited by 28 publications

References 53 publications

Arousing the Reactive Fe Sites in Pyrite (FeS2) via Integration of Electronic Structure Reconfiguration and in Situ Electrochemical Topotactic Transformation for Highly Efficient Oxygen Evolution Reaction

Arousing the Reactive Fe Sites in Pyrite (FeS2) via Integration of Electronic Structure Reconfiguration and in Situ Electrochemical Topotactic Transformation for Highly Efficient Oxygen Evolution Reaction

Orientation-Adjustable Metal–Organic Framework Nanorods for Efficient Oxygen Evolution Reaction

Analytical methods for sensing of health-hazardous arsenic from biotic and abiotic natural resources

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Arousing the Reactive Fe Sites in Pyrite (FeS₂) via Integration of Electronic Structure Reconfiguration and in Situ Electrochemical Topotactic Transformation for Highly Efficient Oxygen Evolution Reaction

Arousing the Reactive Fe Sites in Pyrite (FeS₂) via Integration of Electronic Structure Reconfiguration and in Situ Electrochemical Topotactic Transformation for Highly Efficient Oxygen Evolution Reaction