The effect of Mg-doping and Cu nonstoichiometry on the photoelectrochemical response of CuFeO<sub>2</sub>

Wuttig, Anna; Krizan, Jason W.; Gu, Jing; Frick, Jessica J.; Cava, R. J.; Bocarsly, Andrew Bruce

doi:10.1039/c6ta06504j

Cited by 46 publications

(32 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…While the percentage of 3R decrease with further increase the concentration of Mg. It is worth to note that above 0.5% doping level, Cu 2 O will generate as impurity as reported by Anna . Within this experimental doping concentration, the doping process did not modify the crystallization of CuFeO 2 .…”

Section: Resultssupporting

confidence: 71%

“…A lot of methods, such as solid‐state reaction, sol–gel, are used to prepared Mg doped CuFeO 2 for different applications. To the best of our knowledge, there is no report on hydrothermal route for Mg doping CuFeO 2 for the application of photoelectrochemical water reduction.…”

Section: Introductionmentioning

confidence: 99%

“…It is well known that, doping will change the local chemical environment and thus the defect structure and electronic structure, which furthermore strongly influence the properties of the material. Hall effect measurement was also carried out to characterize the conductivity and mobility of materials to study the role of the dopant . However, the detailed mechanism of how photoelectrochemical water reduction performance was enhanced is still unclear.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Enhancing the Lifetime of Photoinduced Charge Carriers in CuFeO₂ Nanoplates by Hydrothermal Doping of Mg for Photoelectrochemical Water Reduction

Jiang

Zhao

Liu

et al. 2018

Physica Status Solidi (a)

View full text Add to dashboard Cite

Highly active and stable photocathodes are desirable for efficient photoelectrochemical water reduction. However, most photocathode materials suffer from the short lifetime of photoinduced charge carriers resulting in low energy conversion efficiency. Herein, the authors present a novel strategy to enhance the lifetime of photoinduced charge carriers for hexagonal CuFeO 2 platelets based photocathode. The enhancement is realized by simply hydrothermal doping of Mg into CuFeO 2 . Quantitative phase composition analysis and characterizations are carried out for the Mg doped CuFeO 2 materials with varied doping contents. This doping route not only induces to more acceptor-type states to increase the p-type carrier concentration, but also improves conductivity of CuFeO 2 and facilitates easier carriers transport, which are the key factors for the lifetime enhancement. After systematical tuning of the doping amount, the authors find that when the Mg content reaches 0.1%, the CuFeO 2 presents the longest lifetime for the photoinduced charge carriers (0.8485 s) referring to an enhancement of 94% in the lifetime compared with pure CuFeO 2 .

show abstract

Section: Resultssupporting

confidence: 71%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Enhancing the Lifetime of Photoinduced Charge Carriers in CuFeO₂ Nanoplates by Hydrothermal Doping of Mg for Photoelectrochemical Water Reduction

Jiang

Zhao

Liu

et al. 2018

Physica Status Solidi (a)

View full text Add to dashboard Cite

show abstract

“…Delafossite type oxides Cu I M III O 2 with M = (Fe, Al, Ga, Cr…) due to their large range of properties and the abundance of their constituent elements in the nature, have been studied for several applications such as transparent p-type conducting oxides (TCO) [10,11,12,13,14,15,16,17], transparent electronic devices [18,19,20,21,22,23,24,25], dye-sensitized solar cells [26,27,28,29], and photoelectrodes [30] but also for outstanding catalysis [31] and photo-catalysis [31,32,33,34,35,36,37,38,39,40,41], antibacterial [42], luminescence [43,44,45], gas and temperature sensing [46,47,48,49], magnetic and electric [50,51,52,53,54], energy storage [55], oxygen storage [56], water reduction [57], thermoelectricity and superconductivity [58] properties. In the oxide family, the cation Cu I is a monovalent metal and the cation M III is a trivalent metal.…”

Section: Introductionmentioning

confidence: 99%

Thermoelectric and Transport Properties of Delafossite CuCrO2:Mg Thin Films Prepared by RF Magnetron Sputtering

et al. 2017

View full text Add to dashboard Cite

P-type Mg doped CuCrO2 thin films have been deposited on fused silica substrates by Radio-Frequency (RF) magnetron sputtering. The as-deposited CuCrO2:Mg thin films have been annealed at different temperatures (from 450 to 650 °C) under primary vacuum to obtain the delafossite phase. The annealed samples exhibit 3R delafossite structure. Electrical conductivity σ and Seebeck coefficient S of all annealed films have been measured from 40 to 220 °C. The optimized properties have been obtained for CuCrO2:Mg thin film annealed at 550 °C. At a measurement temperature of 40 °C, this sample exhibited the highest electrical conductivity of 0.60 S·cm−1 with a Seebeck coefficient of +329 µV·K−1. The calculated power factor (PF = σS²) was 6 µW·m−1·K−2 at 40 °C and due to the constant Seebeck coefficient and the increasing electrical conductivity with measurement temperature, it reached 38 µW·m−1·K−2 at 220 °C. Moreover, according to measurement of the Seebeck coefficient and electrical conductivity in temperature, we confirmed that CuCrO2:Mg exhibits hopping conduction and degenerates semiconductor behavior. Carrier concentration, Fermi level, and hole effective mass have been discussed.

show abstract

“…A few different techniques have been developed to improve CuFeO 2 photocathodes. To enhance bulk carrier concentration and conductivity, dopants were introduced into the bulk of the materials . Copper nonstoichiometry has been used for a copper‐based delafossite by oxygen intercalation into the copper layers of the structure.…”

Section: Copper‐based Oxide Photocathodesmentioning

confidence: 99%

Photoelectrochemical Water Splitting with p‐Type Metal Oxide Semiconductor Photocathodes

2019

View full text Add to dashboard Cite

Photoelectrochemical (PEC) water splitting is a promising way to produce clean and sustainable hydrogen fuel. Solar hydrogen production by using p‐type metal oxide semiconductor photocathodes has not been studied as extensively as that with n‐type metal oxide semiconductor photoanodes and p‐type photovoltaic‐grade non‐oxide semiconductor photocathodes. Copper‐based oxide photocathodes show relatively good conductivity, but suffer from instability in aqueous solution under illumination, whereas iron‐based metal oxide photocathodes demonstrate more stable PEC performance but have problems in charge separation and transport. Herein, an overview of recent progress in p‐type metal oxide‐based photocathodes for PEC water reduction is provided. Although these materials have not been fully developed to reach their potential performance, the challenges involved have been identified and strategies to overcome these limitations have been proposed. Future research in this field should address these issues and challenges in addition to the discovery of new materials.

show abstract

The effect of Mg-doping and Cu nonstoichiometry on the photoelectrochemical response of CuFeO₂

Abstract: We report the tuning of CuFeO2 photoelectrodes by Mg doping and Cu deficiency to demonstrate the effects of carrier concentration on the photoresponse.

Cited by 46 publications

References 47 publications

Enhancing the Lifetime of Photoinduced Charge Carriers in CuFeO₂ Nanoplates by Hydrothermal Doping of Mg for Photoelectrochemical Water Reduction

Enhancing the Lifetime of Photoinduced Charge Carriers in CuFeO₂ Nanoplates by Hydrothermal Doping of Mg for Photoelectrochemical Water Reduction

Thermoelectric and Transport Properties of Delafossite CuCrO2:Mg Thin Films Prepared by RF Magnetron Sputtering

Photoelectrochemical Water Splitting with p‐Type Metal Oxide Semiconductor Photocathodes

Contact Info

Product

Resources

About

The effect of Mg-doping and Cu nonstoichiometry on the photoelectrochemical response of CuFeO2

Abstract: We report the tuning of CuFeO2 photoelectrodes by Mg doping and Cu deficiency to demonstrate the effects of carrier concentration on the photoresponse.

Cited by 46 publications

References 47 publications

Enhancing the Lifetime of Photoinduced Charge Carriers in CuFeO2 Nanoplates by Hydrothermal Doping of Mg for Photoelectrochemical Water Reduction

Enhancing the Lifetime of Photoinduced Charge Carriers in CuFeO2 Nanoplates by Hydrothermal Doping of Mg for Photoelectrochemical Water Reduction

Thermoelectric and Transport Properties of Delafossite CuCrO2:Mg Thin Films Prepared by RF Magnetron Sputtering

Photoelectrochemical Water Splitting with p‐Type Metal Oxide Semiconductor Photocathodes

Contact Info

Product

Resources

About

The effect of Mg-doping and Cu nonstoichiometry on the photoelectrochemical response of CuFeO₂

Enhancing the Lifetime of Photoinduced Charge Carriers in CuFeO₂ Nanoplates by Hydrothermal Doping of Mg for Photoelectrochemical Water Reduction

Enhancing the Lifetime of Photoinduced Charge Carriers in CuFeO₂ Nanoplates by Hydrothermal Doping of Mg for Photoelectrochemical Water Reduction