A precious metal-free solar water splitting cell with a bifunctional cobalt phosphide electrocatalyst and doubly promoted bismuth vanadate photoanode

Kim, Jin Hyun; Han, Seung-Jin; Jo, Yim Hyun; Bak, Yunji; Lee, Jin Ho

doi:10.1039/c7ta09134f

Cited by 58 publications

(38 citation statements)

References 50 publications

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“…Enlightened from the bifunctional effects of metal phosphide in the field of electrochemistry, some researchers also explored their dual function in PEC water splitting. Kim et al reported a CoP‐coupled Mo:BiVO 4 photoanode connected with CoP‐coupled Ni‐foam synthesized by drop casting, exhibiting excellent PEC‐OER and PEC‐HER activities. And the CoP loading brings ≈90% injection of holes arriving on the surface, which avoided the serious recombination and largely boosted the kinetics of reaction.…”

Section: Cocatalysts For Photoanodes: Construction and Regulationmentioning

confidence: 99%

Rational Design and Construction of Cocatalysts for Semiconductor‐Based Photo‐Electrochemical Oxygen Evolution: A Comprehensive Review

et al. 2018

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Photo‐electrochemical (PEC) water splitting, as an essential and indispensable research branch of solar energy applications, has achieved increasing attention in the past decades. Between the two photoelectrodes, the photoanodes for PEC water oxidation are mostly studied for the facile selection of n‐type semiconductors. Initially, the efficiency of the PEC process is rather limited, which mainly results from the existing drawbacks of photoanodes such as instability and serious charge‐carrier recombination. To improve PEC performances, researchers gradually focus on exploring many strategies, among which engineering photoelectrodes with suitable cocatalysts is one of the most feasible and promising methods to lower reaction obstacles and boost PEC water splitting ability. Here, the basic principles, modules of the PEC system, evaluation parameters in PEC water oxidation reactions occurring on the surface of photoanodes, and the basic functions of cocatalysts on the promotion of PEC performance are demonstrated. Then, the key progress of cocatalyst design and construction applied to photoanodes for PEC oxygen evolution is emphatically introduced and the influences of different kinds of water oxidation cocatalysts are elucidated in detail. Finally, the outlook of highly active cocatalysts for the photosynthesis process is also included.

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Section: Cocatalysts For Photoanodes: Construction and Regulationmentioning

confidence: 99%

Rational Design and Construction of Cocatalysts for Semiconductor‐Based Photo‐Electrochemical Oxygen Evolution: A Comprehensive Review

et al. 2018

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“…[ 27 ] The binding energies of Co 2p and P 2p lines and Ni 2p and Fe 2p lines are consistent with those previously reported for CoP and FeNi(OH) x . [ 24,25,27 ] The typical elemental peaks of Co, P, Fe, and Ni are also found in the EDS spectra of these co‐catalyst layers (Figure S3, Supporting Information). These results confirm that the CoP and FeNi(OH) x co‐catalysts have been successfully synthesized.…”

Section: Resultsmentioning

confidence: 95%

“…The P 2p core levels (Figure 2e) reveal the presence of phosphide (129.2.0, 130.0 eV) and phosphorus (131.8 and 132.6 eV). [ 25 ] The presence of the phosphorus species has been ascribed to the superficial oxidation of CoP when exposed to air. [ 26 ] Peak fitting analysis for the Ni 2p (Figure 2d) of the as‐deposited FeNi(OH) x co‐catalysts indicates the presence of Ni 2+ (855.3 and 873.1 eV).…”

Section: Resultsmentioning

confidence: 99%

Integrating Low‐Cost Earth‐Abundant Co‐Catalysts with Encapsulated Perovskite Solar Cells for Efficient and Stable Overall Solar Water Splitting

Chen

Zhang

Trần‐Phú

et al. 2020

Adv Funct Materials

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Metal halide perovskite solar cells have an appropriate bandgap (1.5–1.6 eV), and thus output voltage (>1 V), to directly drive solar water splitting. Despite significant progress, their moisture sensitivity still hampers their application for integrated monolithic devices. Furthermore, the prevalence of the use of noble metals as co‐catalysts for existing perovskite‐based devices undermines their use for low‐cost H2 production. Here, a monolithic architecture for stable perovskite‐based devices with earth‐abundant co‐catalysts is reported, demonstrating an unassisted overall solar‐to‐hydrogen efficiency of 8.54%. The device layout consists of two monolithically encapsulated perovskite (FA0.80MA0.15Cs0.05PbI2.55Br0.45) solar cells with low‐cost earth‐abundant CoP and FeNi(OH)x co‐catalysts as the photocathode and photoanode, respectively. The CoP‐based photocathode demonstrates more than 17 h of continuous operation, with a photocurrent density of 12.4 mA cm−2 at 0 V and an onset potential as positive as ≈1 V versus reversible hydrogen electrode (RHE). The FeNi(OH)x‐based photoanode achieves a photocurrent of 11 mA cm−2 at 1.23 V versus RHE for more than 13 h continuous operation. These excellent stability and performance demonstrate the potential for monolithic integration of perovskite solar cells and low‐cost earth‐abundant co‐catalysts for efficient direct solar H2 production.

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“…first use a CoP catalyst on a BiVO 4 photoanode. [ 140 ] They have found a very similar behavior of BiVO 4 /CoP and BiVO 4 /CoPi in a KPi buffer solution and attribute it to the progressive conversion of CoP particles to a cobalt hydroxyphosphate compound (CoO x –HPO y ) after PEC operation, which is effectively the same phase as CoPi ( Figure 23a ). In comparison, Xia et al.…”

Section: Elements Complements and Combinations Of Oecsmentioning

confidence: 92%

“…Reproduced with permission. [ 140 ] Copyright 2018, The Royal Society of Chemistry. b) J–V curves of bare TiO 2 (black), Co 3 O 4 /TiO 2 (red), O‐Ar/Co 3 O 4 /TiO 2 (green), and Ar‐Co 3 O 4 /TiO 2 (blue) photoanodes.…”

Section: Elements Complements and Combinations Of Oecsmentioning

confidence: 99%

Oxygen Evolution Catalysts at Transition Metal Oxide Photoanodes: Their Differing Roles for Solar Water Splitting

Zhang

Cui

Eslava

2021

Advanced Energy Materials

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In the field of photoelectrochemical water splitting for hydrogen production, dedicated efforts have recently been made to improve water oxidation at photoanodes, and in particular, to accelerate the poor kinetics of the oxygen evolution reaction which is a key step in achieving a viable photocurrent density for industrialization. To this end, coating the photoanode semiconductors with oxygen evolution catalysts (OECs) has been one of the most popular options. The roles of OECs have been found to be multifold, as opposed to exclusively catalytic. This review aims to unravel the complexity of the interfacial processes arising from the material properties of both semiconductors and OECs, and to rationalize the variation in findings in the literature regarding the roles of OECs. Light is also shed on some of the most useful characterization techniques that probe the dynamics of photogenerated holes, to answer some of the field's most challenging mechanistic questions. Finally, some ideas and suggestions on the design principles of OECs are proposed.

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A precious metal-free solar water splitting cell with a bifunctional cobalt phosphide electrocatalyst and doubly promoted bismuth vanadate photoanode

Cited by 58 publications

References 50 publications

Rational Design and Construction of Cocatalysts for Semiconductor‐Based Photo‐Electrochemical Oxygen Evolution: A Comprehensive Review

Rational Design and Construction of Cocatalysts for Semiconductor‐Based Photo‐Electrochemical Oxygen Evolution: A Comprehensive Review

Integrating Low‐Cost Earth‐Abundant Co‐Catalysts with Encapsulated Perovskite Solar Cells for Efficient and Stable Overall Solar Water Splitting

Oxygen Evolution Catalysts at Transition Metal Oxide Photoanodes: Their Differing Roles for Solar Water Splitting

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