Copper vanadates as candidate materials for phase change optical memory

Birnie, Dunbar P.; Weinberg, J.; Swanson, D. G.

doi:10.1557/jmr.1992.0741

Cited by 4 publications

(3 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The identification of ternary oxide compounds in the CuOV 2 O 5 system dates back 60 years, and several compounds have been found to be synthetic analogues of volcanic minerals . The exploration of these compounds as functional materials has occurred more recently, with initial technology applications ranging from memory phase change materials to heterogeneous catalysts to Li intercalation electrodes . These studies have primarily involved compounds of stoichiometry CuV 2 O 6 , Cu 2 V 2 O 7 , and Cu 3 V 2 O 8 , with the latter two stoichiometries each exhibiting three polytypes (see Table S1, Supporting Information).…”

Section: Introductionmentioning

confidence: 99%

High Throughput Discovery of Solar Fuels Photoanodes in the CuO–V₂O₅ System

Zhou

Yan

Shinde

et al. 2015

Advanced Energy Materials

103

View full text Add to dashboard Cite

Solar photoelectrochemical generation of fuel is a promising energy technology yet the lack of an efficient, robust photoanode remains a primary materials challenge in the development and deployment of solar fuels generators. Metal oxides comprise the most promising class of photoanode materials, but no known material meets the demanding requirements of low band gap energy, photoelectrocatalysis of the oxygen evolution reaction (OER), and stability under highly oxidizing conditions. Here, the identification of new photoelectroactive materials is reported through a strategic combination of combinatorial materials synthesis, high‐throughput photoelectrochemistry, optical spectroscopy, and detailed electronic structure calculations. Four photoelectrocatalyst phases, α‐Cu2V2O7, β‐Cu2V2O7,γ‐Cu3V2O8, and Cu11V6O26, are reported with band gap energy at or below 2 eV. The photoelectrochemical properties and 30 min stability of these copper vanadate phases are demonstrated in three different aqueous electrolytes (pH 7, pH 9, and pH 13), with select combinations of phase and electrolyte exhibiting unprecedented photoelectrocatalytic stability for metal oxides with sub‐2 eV band gap. Through integration of experimental and theoretical techniques, new structure‐property relationships are determined and establish CuO–V2O5 as the most prominent composition system for OER photoelectrocatalysts, providing crucial information for materials genomes initiatives and paving the way for continued development of solar fuels photoanodes.

show abstract

Section: Introductionmentioning

confidence: 99%

High Throughput Discovery of Solar Fuels Photoanodes in the CuO–V₂O₅ System

Zhou

Yan

Shinde

et al. 2015

Advanced Energy Materials

103

View full text Add to dashboard Cite

show abstract

“…[8][9][10] Besides, the copper vanadates also show excellent performance for catalytic oxidation in organic chemistry [11][12][13] and phase change optical memory. 14 Several techniques have been developed for the synthesis of the nanostructures of copper vanadate, such as hydrothermal method, 9,15 a simple template-free solution method, 10 and a co-precipitation method. 16 However, these methods have some visible flaws such as the synthesis route requiring high temperature or high pressure, the introduction of toxic raw materials or additives, and requiring complicated synthetic procedures that result in impurities in the final products.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of copper vanadate nanostructures via electrochemistry assisted laser ablation in liquid and the optical multi-absorptions performance

Liang

Liu

et al. 2012

CrystEngComm

View full text Add to dashboard Cite

“…Analogous to FeVO4 and Mn2V2O7, copper vanadates before were only considered as battery materials or other applications. [81][82][83][84] Copper vanadate system is taken into account for water splitting more recently. Cu3V2O8…”

Section: Copper Vanadatementioning

confidence: 99%

Investigating cation-substituted metal vanadate photoanodes for solar water splitting

Zhang¹

View full text Add to dashboard Cite

As a promising way to harvest solar energy, photoelectrochemical (PEC) water splitting has attracted intensive interest and attention in recent years. Some issues remain in the field of PEC water splitting and the choice of photoanode is an important problem. Recent decade has witnessed the rapid development of BiVO4 as one of the most successful photoanodes. While it has achieved 90% of its theoretical photocurrent, further improvement is limited by its relatively large bandgap 2.4 eV. Hence, to find alternative photoanode candidates with lower bandgap and comparable charge transport properties is urgently needed. This thesis aims to explore cation substituted metal vanadates which have lower bandgap than BiVO4 and comparable charge transport properties. First, the properties of BiVO4 and the role of catalyst have been explored to understand the limitation of BiVO4 photoanode. Next, Fe was incorporated into BiVO4 system to partially substitute Bi to create a mixture of BiVO4 and FeVO4. All the mixed metal vanadate photoanodes indeed have lower bandgap than BiVO4. PEC measurements show that Bi/Fe in 1:1 ratio has the highest performance and the bandgap has lowered to 2.2 eV. The heterojunction between BiVO4 and FeVO4 is also confirmed to be beneficial to charge separation. FeVO4 has a near-optimal bandgap around 2.07 eV, but its photocurrent achieved has been an order lower than BiVO4. The intrinsic properties of this compound are not available in the literature and hence limit its development as a potential photoanode. In this thesis, a series of characterizations have been carried out for the first time to determine the intrinsic properties and to understand the performance limiting factor. It is found that the performance of FeVO4 is limited by its poor charge carrier separation. With the help of microwave conductivity measurements, the origin of inefficient charge separation is attributed to the low carrier mobility. Doping has been applied to improve the carrier concentration and mobility, but the absolute photocurrent increase is limited and separation efficiency still remains low.

show abstract

Copper vanadates as candidate materials for phase change optical memory

Cited by 4 publications

References 8 publications

High Throughput Discovery of Solar Fuels Photoanodes in the CuO–V₂O₅ System

High Throughput Discovery of Solar Fuels Photoanodes in the CuO–V₂O₅ System

Synthesis and characterization of copper vanadate nanostructures via electrochemistry assisted laser ablation in liquid and the optical multi-absorptions performance

Investigating cation-substituted metal vanadate photoanodes for solar water splitting

Contact Info

Product

Resources

About

Copper vanadates as candidate materials for phase change optical memory

Cited by 4 publications

References 8 publications

High Throughput Discovery of Solar Fuels Photoanodes in the CuO–V2O5 System

High Throughput Discovery of Solar Fuels Photoanodes in the CuO–V2O5 System

Synthesis and characterization of copper vanadate nanostructures via electrochemistry assisted laser ablation in liquid and the optical multi-absorptions performance

Investigating cation-substituted metal vanadate photoanodes for solar water splitting

Contact Info

Product

Resources

About

High Throughput Discovery of Solar Fuels Photoanodes in the CuO–V₂O₅ System

High Throughput Discovery of Solar Fuels Photoanodes in the CuO–V₂O₅ System