Solar Charged Redox Flow Battery: A Tandem Photoelectrochemical Approach

Durant, Brandon K.; She, Yuqi; Wang, Peng; Kraus, Theodore J.; Parkinson, B. A.

doi:10.1149/2.0011905jes

Cited by 10 publications

(7 citation statements)

References 74 publications

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“…This performance, including the onset potential and FF, is comparable to the reported n‐GaP photoelectrode in contact with uncoated n‐GaP in a non‐aqueous ferrocenium/ferrocene solution. [ 29 ] The open‐circuit potential of a Pt metallic electrode is 0.26 V versus SCE, which is poised at the Fe(CN) 6 3−/4− redox potential. Using this reversible redox couple, we find the maximum power point at −0.35 V versus SCE with a photocurrent density of 0.38 mA cm −2 .…”

Section: Resultsmentioning

confidence: 99%

Tuning Intermediate Bands of Protective Coatings to Reach the Bulk‐Recombination Limit of Stable Water‐Oxidation GaP Photoanodes

Shen

Zhao

et al. 2022

Advanced Energy Materials

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Stable photoelectrochemical solar fuel production requires protective coatings to achieve effective charge separation, transport, and injection at the semiconductor–liquid interfaces, implying that the coating should energetically align its intermediate band (IB) with both the photoabsorber's band edge and co‐catalyst's potentials. Yet approaches to adjust coating IB positions to accommodate various semiconductor light absorbers for constructing efficient and stable photoelectrodes have not been developed. Herein, three types of transition metal (M = Mn2+, Mn3+, and Cr3+ ions) alloyed TiO2 coatings are discovered using atomic layer deposition (ALD). The IB energetics of these coatings are characterized by X‐ray photoelectron spectroscopy and are found to be tunable inside the TiO2 bandgap, through varying ALD growth conditions. By applying these coatings to n‐type GaP and integrating with IrOx co‐catalysts, the water‐oxidation J–E performance is comparable to an uncoated corroding GaP photoanode. It reaches the bulk recombination limit of the GaP and achieves ≈28% absorbed photon to current efficiency under 475‐nm light excitation (6.48 mW cm−2) and 100‐h stable water oxidation. The outstanding performance and stability are attributed to the efficient charge separation and hole transport, as allowed by the energy alignment of the coating IB and the GaP valence band edge.

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Section: Resultsmentioning

confidence: 99%

Tuning Intermediate Bands of Protective Coatings to Reach the Bulk‐Recombination Limit of Stable Water‐Oxidation GaP Photoanodes

Shen

Zhao

et al. 2022

Advanced Energy Materials

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“…In addition, Durant et al. reported a vanadium‐based two‐photoelectrode cell with a wider band gap photoanode (n‐GaP) and a narrower band gap photocathode (p‐InP) . In addition to optimize photoelectrodes, forced convective flow of electrolytes and supporting electrolytes are other two favorable strategies to improve the photoelectrochemical performance of the vanadium‐based solar redox batteries.…”

Section: Photo‐responsive Batteries With Dual‐solid Active Materialsmentioning

confidence: 99%

Integrated Photo‐Responsive Batteries for Solar Energy Harnessing: Recent Advances, Challenges, and Opportunities

Fang

2020

ChemPlusChem

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responsive batteries that enable the effective combination of solar harvesting and energy conversion/storage functionalities render a potential solution to achieve the large-scale utilization of unlimited and cost-effective solar energy and alleviate the limits of conventional energy storage devices. The internal integration of photo-responsive electrodes into rechargeable batteries with the simplest two-electrode configuration is regarded as a reliable and appealing strategy for highly-efficient and low-cost utilization of solar energy by simplifying the device architecture and improving the energy efficiency. This progress report provides a brief review on photo-responsive batteries with integrated two-electrode configuration that can achieve solar energy conversion/storage in one single device. The basic device architecture, operating principles and practical performance of various photo-responsive systems based on solar energy harvesting in various batteries including Li ion batteries, LiÀ S batteries, LiÀ I batteries, dual-liquid redox batteries, LiÀ O 2 batteries, non-Li anode-O 2 /air batteries are summarized and discussed. Finally, the future opportunities and challenges regarding the two-electrode photo-responsive batteries are proposed.[a] Dr.

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“…However, due to the lower PCE of DSSCs, these early SFBs have never reached a SOEE higher than 1%. Many other semiconductor materials, including α-Fe 2 O 3 , 47 BiVO 4 , 48 CdS, 49 WSe 2 , 50 Ta 3 N 5 , 51 GaP, 52 and InP 52 have also been investigated for SFBs. Aqueous electrolytes were used in recent studies possibly due to the rapid emergence of new aqueous redox couples.…”

Section: Sfbs With Simple Semiconductor Photoelectrodesmentioning

confidence: 99%

“…However, due to the lower PCE of DSSCs, these early SFBs have never reached a SOEE higher than 1%. Many other semiconductor materials, including α-Fe 2 O 3 , BiVO 4 , CdS, WSe 2 , Ta 3 N 5 , GaP, and InP have also been investigated for SFBs. Aqueous electrolytes were used in recent studies possibly due to the rapid emergence of new aqueous redox couples. , By far the highest SOEE shown in this category is 2.8%, which was achieved by integrating a single-crystal WSe 2 photoelectrode and AQSH 2 /AQS-I – /I 3 – redox couples (Figure S1b).…”

Section: Summary Of Recent Progress and The State-of-the-art Of Sfbsmentioning

confidence: 99%

Design Principles and Developments of Integrated Solar Flow Batteries

Jin

2020

Acc. Chem. Res.

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Conspectus Due to the intermittent nature of sunlight, practical round-trip solar energy utilization systems require both efficient solar energy conversion and inexpensive large-scale energy storage. Conventional round-trip solar energy utilization systems typically rely on the combination of two or more separated devices to fulfill such requirements. Integrated solar flow batteries (SFBs) are a new type of device that integrates solar energy conversion and electrochemical storage. In SFBs, the solar energy absorbed by photoelectrodes is converted into chemical energy by charging up redox couples dissolved in electrolyte solutions in contact with the photoelectrodes. To deliver electricity on demand, the reverse redox reactions are carried out to release chemical energy stored in redox couples as one would do in the discharge of a normal redox flow battery (RFB). The integrated design of SFBs enables all the functions demanded by round trip solar energy utilization systems to be realized within a single device. Leveraging rapidly developing parallel technologies of photovoltaic solar cells and RFBs, significant progress in the field of SFBs has been made in the past few years. This Account aims to provide a general reference and tutorial for researchers who are interested in SFBs, and to describe the design principles and thus facilitate the development of this nascent field. The operation principle of SFBs is built on the working mechanism of RFBs and photoelectrochemical (PEC) cells, so we first describe the basic concept and important features of RFBs and redox couples with the emphasis on the quantitative understanding of RFB cell potentials. We also introduce different types of PEC cells and highlight two different photoelectrode designs that are commonly seen in SFB literature: simple semiconductor photoelectrodes and PV cell photoelectrodes. A set of experimental protocols for characterizing the redox couples, RFBs, photoelectrodes, and SFBs are presented to promote comparable assessment and discussion of important figures of merits of SFBs. Solar-to-output electricity efficiency (SOEE) defines the round trip energy efficiency of SFBs and has received substantial research attention. We introduce a quantitative simulation method to find the relationship between the SOEE and cell potential of SFBs and reveal the design principles for highly efficient SFBs. Several other important performance metrics of SFBs are also introduced. Then we review the historical development of SFBs and identify the state-of-the-art demonstrations at each development stage with more emphasis on our own research efforts in developing SFBs built with PV photoelectrodes. Finally, we preview some promising future directions and the challenges for advancing both the scientific understanding and practical applications of SFBs.

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Solar Charged Redox Flow Battery: A Tandem Photoelectrochemical Approach

Cited by 10 publications

References 74 publications

Tuning Intermediate Bands of Protective Coatings to Reach the Bulk‐Recombination Limit of Stable Water‐Oxidation GaP Photoanodes

Tuning Intermediate Bands of Protective Coatings to Reach the Bulk‐Recombination Limit of Stable Water‐Oxidation GaP Photoanodes

Integrated Photo‐Responsive Batteries for Solar Energy Harnessing: Recent Advances, Challenges, and Opportunities

Design Principles and Developments of Integrated Solar Flow Batteries

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