Designing materials with appropriate crystal and electronic structures to enhance ionic and electronic transport simultaneously are highly desirable for both electrochromic and electrochemical energy storage devices. It remains a great challenge to simultaneously meet these requirements. Here, a Nb18W16O93 nanomaterial is successfully synthesized with superstructure motifs and uniform self‐supported electrochromic films are prepared on a transparent conductive substrate. The results show that the films can effectively accommodate lithium ions and facilitate intercalation–deintercalation on transparent fluorine‐doped tin oxide (FTO) substrates at high current density. Mechanistic insights into the excellent electrochromic and rechargeable energy storage properties are provided by density functional theory (DFT) calculations. Specifically, the Nb18W16O93 film displays a large optical modulation (up to 93% at 633 nm and 89% at 1200 nm), high coloration efficiency (105.6 cm2 C−1), high energy storage capacity (151.4 mAh g−1 at 2 A g−1), excellent rate capability, and long‐term electrochemical stability (6000 cycles). As a demonstration of its application, an energy storage indicator is illustrated and a complementary electrochromic energy storage smart window is fabricated based on the Nb18W16O93 film. The results demonstrate that the Nb18W16O93 nanomaterial has a promising application in the field of high‐performance electrochromic and energy storage devices.

Electrochromic smart windows can dynamically regulate the transmittance of solar radiation to reduce the energy consumption and improve occupantss comfort in the building. Metal oxide-based electrochromic materials are highly desired...

Electrochromic devices (ECDs) have a broad range of application prospects in many important energy efficient optoelectronic fields, such as smart windows, anti-glare rearview mirrors, low-energy displays, and infrared camouflage. However, there are some factors restricting their development, such as low coloration efficiency, slow switching speed, and poor cycling stability. Coordination polymer (CP) is a promising active material for the fabrication of high-performance ECD because of its ultrahigh coloration efficiency, fast switching speed, and excellent cycling stability. In this review, current advances of CP in energy efficient ECDs are comprehensively summarized and evaluated. Specifically, the effects of composition, coordination bonding, and microstructure of the bipyridine- and terpyridine-based CP on EC performances are introduced and discussed in detail. Then, the challenges and prospects of this booming field are proposed. Finally, the broad application prospects of the CPs-based EC materials and the corresponding devices are also demonstrated, which hold numerous revolutionary effects over our daily life. Hopefully, this review would provide useful guidance and further promote progress on the electrochromic and other optoelectronic fields.

Electrochromic devices (ECDs) present promising prospects in developing energy-saving applications, such as smart windows, antiglare mirrors, and information displays. Here, for the first time, we develop a multistep strategy to improve the electrochromic performance by fully using the adsorption/desorption, insertion/extraction, and reversible electrodeposition of Zn 2+ within the ECD based on the specific crystal superstructured Nb 18 W 16 O 93 film. The synergistic electrochemical process based on the Zn 2+ enables comprehensive enhancement of the electrochromic performance, such as large and broad optical modulation up to 87.0%, 96.2%, and 92.8% at 400, 633, and 1200 nm, respectively, remarkable cycling stability of 3500 cycles, and high coloration efficiency of 72.4 cm 2 C −1 . Furthermore, the assembled device delivers outstanding performance in wide-band and large optical modulation in response to a change in voltage. We believe that our multistep regulation in one device could provide a new strategy for developing high-performance ECDs and shed new light on exploring next-generation ECDs in the future.