A fast-switching electrochromic device with a surface-confined 3D metallo-organic coordination assembly

Jena, Satya Ranjan; Choudhury, Joyanta

doi:10.1039/c9cc06920h

Cited by 31 publications

(21 citation statements)

References 36 publications

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“…Importantly, this study shows that the performance of our MAs is comparable to that of MOFs on a surface. [24][25][26][27] Interestingly, many other metalorganic assemblies reported by us [28][29][30][31][32][33][34][35][36][37][38][39] and others [40][41][42][43][44][45][46][47] could be used for water splitting studies as well.…”

Section: Discussionmentioning

confidence: 99%

“…[38,39] Higuchi, Li, Kurth, Nishihara, Zenkina, Zharnikov, and others have studied related materials and demonstrated some of these functionalities. [40][41][42][43][44][45][46][47] However, the electrocatalytic properties of these MAs have not been explored. DOI: 10.1002/ente.202100769 Herein, two different functionalities of one metallo-organic film assembled on the surface of a transparent metal-oxide electrode are described.…”

Section: Introductionmentioning

confidence: 99%

“…Such gels can contain volatile organic solvents and are prone to leakage. [30,31,39,[42][43][44][45][46][47] The MAs have been prepared by using fully automated LBL spin-coating. The system that we use is based on two functional components: a polypyridyl iron complex (1) and a common palladium dichloride salt (Scheme 1).…”

Section: Introductionmentioning

confidence: 99%

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Electrochromism or Water Splitting in Neutral Aqueous Solutions by a Metallo‐Organic Assembly

et al. 2021

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Herein, two different functionalities of one metallo‐organic film assembled on the surface of a transparent metal‐oxide electrode are described. Two redox‐active elements, electrochromic iron–polypyridyl complexes and catalytically active palladium centers, operate by applying different potentials in aqueous solutions. The color of the material can be cycled 1500 times from dark purple to colorless by electrochemically addressing the Fe2+/3+ centers at 0.0–1.0 V (vs Ag/Ag+). The differences between the transmittance of these two states is high: ΔT = 52%. Catalytic water oxidation can occur by palladium oxide particles that form in situ by applying a higher potential (1.22–2.0 V vs Ag/Ag+), resulting in the formation of hydrogen and oxygen. The catalyst is active for at least 7 h in an aqueous electrolyte at pH = 6.9, with a Faradaic efficiency of ≈70%.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Electrochromism or Water Splitting in Neutral Aqueous Solutions by a Metallo‐Organic Assembly

et al. 2021

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“…[2,3] Several types of electrochromic materials (ECMs) have been reported, such as metal oxides, organic small molecules, conducting polymers, and metallo-supramolecular polymers. [4][5][6][7][8][9][10][11][12][13][14][15][16][17] However, only a few electrochromic products are commercially available, mainly due to their long response times as well as stability and fabrication-related issues. Liquidgel electrolytes can result in poor stability because of possible side reactions and leakage.…”

Section: Introductionmentioning

confidence: 99%

Electrochromic Metallo–Organic Nanoscale Films: A Molecular Mix and Match Approach to Thermally Robust and Multistate Solid‐State Devices

Malik

Lahav

Boom

2020

Adv Elect Materials

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Dissolving a monomer in an UV-curable liquid electrolyte, followed by exposure to UV light, results in a solid electrolyte matrix. [28,29] Frisbie and co-workers and others formed solid-state electrolytes by dissolving viologen derivatives with a copolymer and ionic liquids. [30-36] Such methods require the EC monomers to have good solubility in liquid-gel electrolytes. ECDs, based on solid polymer electrolytes (SPEs), have a long switching time and relatively low redox stability. [19,26-36] These problems might be due to the low ionic conductivities created by a large interfacial resistance at the electrode or the electrolyte's interface as well as poor contact with the electrodes. [37] In order to advance the application of these ECDs, it is necessary to optimize the working electrode-electrolyte combination to form structurally simplified and highly stable ECDs. Here, we demonstrated solid-state multicolor ECDs based on metallo-organic coatings and a layered architecture. Spraycoated layers of electrochromic metal complexes (1, 2) [38] on transparent conducting metal oxides (TCOs) were covered by dropcasting an electrolyte salt embedded in a UV-cured matrix (Figures 1 and 2). [28,29] These ECDs are thermally robust (100 °C, 24 h), have a redox stability of ≈4500 cycles, and switching times of t = 0.4-2.8 s. The device performance does not require a dedicated ion-storage layer, which is common for analogous devices that use a liquid gel-type electrolyte. [38] The multicolor ECDs reported here are formed by using a mixture of two isostructural iron and osmium complexes in one coating. The solid-polymer electrolyte-based architecture offers a new generation of thermally and electrochemically stable devices based on metallo-organic assemblies.

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“…[38,39] Higuchi, Li, Kurth, Nishihara, Zenkina, Zharnikov, and others have studied related materials in attempting to achieve some of these functionalities. [40][41][42][43][44][45][46][47] However, the electrocatalytic properties of these MAs have not been explored.…”

mentioning

confidence: 99%

Electrochromism or Water Splitting in Neutral Aqueous Solutions by a Metallo-Organic Assembly

Malik

Bendikov

Lahav

et al. 2021

Preprint

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We describe two different functionalities of one metallo-organic film assembled on the surface of a transparent metal-oxide electrode. Two redox-active elements, electrochromic iron-polypyridyl complexes and catalytically-active palladium centers, operate by applying different potentials in aqueous solutions. The color of the material can be cycled 1500 times from dark purple to colorless by electrochemically addressing the Fe2+/3+ centers at 0.0-1.0 V (vs Ag/Ag+). The differences between the transmittance of these two states is high: ΔT = 52%. Catalytic water oxidation can occur by palladium oxide particles that form in-situ by applying a higher potential (1.22-2.0 V vs Ag/Ag+), resulting in the formation of dihydrogen and oxygen. The product output is stable for at least 7 hours in an aqueous electrolyte at pH = 6.9, with a Faradaic efficiency (FE) of ~70%.

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A fast-switching electrochromic device with a surface-confined 3D metallo-organic coordination assembly

Abstract: Demonstrated herein is a fast (<1 s)-switching solid-state electrochromic device, fabricated with an imidazolium-linked [Fe(terpyridine)2]2+-based three-dimensional metallo-organic coordination assembly, exhibiting promising electrochromic attributes.

Cited by 31 publications

References 36 publications

Electrochromism or Water Splitting in Neutral Aqueous Solutions by a Metallo‐Organic Assembly

Electrochromism or Water Splitting in Neutral Aqueous Solutions by a Metallo‐Organic Assembly

Electrochromic Metallo–Organic Nanoscale Films: A Molecular Mix and Match Approach to Thermally Robust and Multistate Solid‐State Devices

Electrochromism or Water Splitting in Neutral Aqueous Solutions by a Metallo-Organic Assembly

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