A TOC-and deposition-free electrochromic window driven by redox flow battery

Under"green architecture"principles,electrochromic smart windows are employed to adjust optical transmittance and indoor temperature,yet their high costs limit the wide application.Here,an electrochromic window is driven by a redox flow battery(RFB),where TOC and deposition layers are no longer needed.The transmittance of the electrochromic window is modulated by the state of oxidation(SOC)of aqueous posolyte Fe(phen)_(3)Cl_(2),which is coupled with BTMAP-Vi negolyte in RFB.Under optimized conditions,average CE,VE,and EE reach 93.25%,92.61%,and 86.35%for RFB with a capacity fading rate of 1.57%per cycle.88.66%optical modulation and 9.36 cm^(2)/C coloration efficiency are achieved in the electrochromic process,and 72.34%optical modulation is maintained after 12000 s.Essentially,the indoor temperature declines 3℃for posolyte with 100%SOC when compared with the control experiment using circulating water for a model house.This means minimum electricity of 0.0185 kWh is saved when using an air conditioner to cool a 100 m^(3)house,which corresponds to declined CO_(2)emission(COE)of 0.0185 kg.This work provides a novel and cost-efficient strategy for modulating indoor comfort via electrochromic windows driven by RFB.

COMMUNITY, CAMPUS, AND CLIMATE AT CENTRAL COMMUNITY COLLEGE-3C INITIATIVE Kearney Center Living Learning Lab and Ecosystem

INTRODUCTION Central Community College (CCC) has multiple campuses and centers in rural agri-cultural communities throughout Central Nebraska and College President, Dr. Greg Smith, was an early adopter to the vision of economic and environmental sustain-ability. Central Community College has been a Cum Laude Leader since 2011 and signatory of the Climate Commitment as part of the Climate Leadership Network (previously the ACUPCC). CCC made a commitment to educate, implement and model the practices needed for a sustainable future. For our communities and ultimately globally, we believe environmental sustainability is important and nec-essary for healthy communities, people and economic sustainability. Each CCC campus and center also has available land to commit to renewable energy, typically not available in most major metropolitan campuses. The State of Nebraska is a late adopter to renewable energy, but with the potential for reduced operating costs, is now embracing sustainable development with CCC and providing leadership with our 3C initiative and Environmental Sustainability Action Plan.

Defect engineering of W^(6+)-doped NiO for high-performance black smart windows

In this report,W^(6+)doping as a defect engineering strategy has been proposed to improve the electrochromic properties of NiO film.Further research was conducted to explore the electrochromic properties and the modified mechanism of W-doped NiO film.Compared to the pure NiO,W-doped NiO film exhibits improved electrochromic properties with significant optical modulation(61.56%at 550 nm),fast switching speed(4.42 s/1.40 s for coloring/bleaching),high coloration efficiency(45.41 cm^(2)·C-1)and outstanding cycling stability(no significant attenuation after 2000 cycles)in Li-based electrolytes.Density functional theory(DFT)calculations combined with the experimental results indicate that the improved electrochromic properties were due to enhanced the electronic conductivity and ion conductivity after the introduction of W^(6+).The charge capacity of W-doped NiO has also been improved,and it can function with WO_(3) to achieve a high performance black electrochromic smart window(ECSW)by balancing charge.This work could advance the fundamental understanding of defect engineering as an effective strategy to boost the electrochromic properties of NiO anodic material,manifesting a significant development as a candidate counter electrode in high-performance black smart windows.

A newly-designed self-powered electrochromic window

By converting incident light into electric power,self-powered electrochromic window(SP-ECW)can achieve color change in electrochromic layer with no need for external voltage.In this work,a newly-de signed SP-ECW is proposed for altering its color between deep blue and colorless state according to on/off state of incident light.The device consists of a working electrode with planar integration of photovoltaic(PV)and electrochromic(EC)elements on one electrode,a platinum counter electrode and a redox electrolyte comprising Br^-/Br_3^-couple.A high transmittance modulation of 41%at 582 nm is obtained.Electrical energy converted from light is not only sufficient to drive the device,but also can be outputted to the external circuit.