超寬頻的透明金屬網格電極於太陽光和幅射熱的同步電致變色調控

由於嚴重的全球變暖和氣候變遷，如何利用可再生能源建立有效的熱管理已成為一個關鍵議題。分別以太陽為熱源，太空為冷卻來源，電致變色裝置可做為調控太陽光和熱輻射以實現加熱和冷卻的關鍵技術。本技術報導介紹了一種基於金屬網格的可撓曲超寬頻透明導電電極(UWB-TCE)，具有低片電阻(Rs = 22.4 ohm/sq)和高全頻透光率(TUV-Vis = 85.63%,Tnear-IR = 87.85%, Tmid-IR = 84.87%)，可實現協同太陽光能和輻射熱管理的電致變色裝置。透過此裝置上的金屬網格，UWB-TCE還可以藉由控制、優化電鍍形態來調整其表面電漿共振，並達到太陽光能加熱模式(高太陽光吸收率和低輻射熱發射率)和輻射冷卻模式(低太陽光吸收率和高輻射熱發射率)之間切換。太陽光加熱模式的最佳陽光吸收率(α)和輻射熱發射率(ε)分別為(α,ε) = (0.60, 0.20)而輻射冷卻模式則為(0.33, 0.94)。實驗結果顯示此報導介紹的UWB-TCE具有太陽光和中紅外波段之雙頻譜電致變色裝置，可對未來熱管理，光學偽裝，顯示和建築耗能應用帶來可觀的機會。

Due to the severe global warming and climate change, developing effective heat management using renewable energy has become a pivotal issue. With the sun as the heat source and the deep space as the cold source, electrochromic device is a key technology to modulate solar and thermal energy for heating and cooling performances. Here, a flexible ultra-wideband transparent conducting electrode (UWB-TCE) based on metal mesh, with low sheet resistance (Rs = 22.4 ohm/sq) and high optical transmittance (TUV-Vis = 85.63%, Tnear-IR =87.85%, and Tmid-IR = 84.87%) has been demonstrated to realize the electrochromic device that is capable of synergistic solar and radiative heat management. Enabled by the metal mesh-based electrochromic device, the UWB-TCE can also switch between solar heating mode (high solar absorptivity and low thermal emissivity) and radiative cooling mode (low solar absorptivity and high thermal emissivity) by controlling optimal electrodeposition morphology for surface plasmon resonance. The optimal solar absorptivity (α) and thermal emissivity (ε) of solar heating and radiative cooling mode are (α,ε) = (0.60, 0.20), and (0.33, 0.94), respectively. The proposed UWB-TCE and dual-band solar and mid-IR electrochromic device can bring vast opportunities for applications in heat management, camouflage, display, and building energy efficiency.