Electrochromic WO3 thin films attain unprecedented durability by potentiostatic pretreatment

Electrochromic windows and glass facades are able to impart energy efficiency jointly with indoor comfort and convenience. Long-term durability is essential for practical implementation of this technology and has recently attracted broad interest. Here we show that a simple potentiostatic pretreatment of sputterdeposited thin films of amorphous WO3-the most widely studied electrochromic material-can yield unprecedented durability for charge exchange and optical modulation under harsh electrochemical cycling in a Li-ion-conducting electrolyte and effectively evades harmful trapping of Li. The pretreatment consisted of applying a voltage of 6.0 V vs. Li/Li+ for several hours to a film backed by a transparent conducting In2O3: Sn layer. Associated compositional and structural modifications were probed by several techniques, and improved durability was associated with elemental intermixing at the WO3/ITO and ITO/glass boundaries as well as with carbonaceous solid-electrolyte interfacial layers on the WO3 films. Our work provides important new insights into long-term durability of ion-exchange-based devices.

Qu, Hui-YingUppsala universitet,Fasta tillståndets fysik,Harbin Inst Technol, Sch Chem & Chem Engn, MIIT Key Lab Crit Mat Technol New Energy Convers, Harbin 150001, Heilongjiang, Peoples R China(Swepub:uu)huiqu570 (författare)
Cindemir, Umut,1986-Uppsala universitet,Fasta tillståndets fysik(Swepub:uu)umuci358 (författare)
Qiu, ZhenUppsala universitet,Fasta tillståndets fysik(Swepub:uu)zheqz440 (författare)
Rojas González, Edgar AlonsoUppsala universitet,Fasta tillståndets fysik(Swepub:uu)edgro604 (författare)
Primetzhofer, DanielUppsala universitet,Tillämpad kärnfysik(Swepub:uu)danpr521 (författare)
Granqvist, Claes Göran,1946-Uppsala universitet,Fasta tillståndets fysik(Swepub:uu)cgr25299 (författare)
Österlund, Lars,1967-Uppsala universitet,Fasta tillståndets fysik(Swepub:uu)laros288 (författare)
Niklasson, Gunnar,1953-Uppsala universitet,Fasta tillståndets fysik(Swepub:uu)gni26208 (författare)
Uppsala universitetFasta tillståndets fysik (creator_code:org_t)

Ingår i:Journal of Materials Chemistry A: ROYAL SOC CHEMISTRY7:6, s. 2908-29182050-74882050-7496

Av författaren/redakt...: Arvizu, Miguel A; Qu, Hui-Ying; Cindemir, Umut, ...; Qiu, Zhen; Rojas González, ...; Primetzhofer, Da ...; visa fler...; Granqvist, Claes ...; Österlund, Lars, ...; Niklasson, Gunna ...; visa färre...

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