Incorporation of Co2+, Cu2+, and Zn2+ ions into nickel oxide thin films and their enhanced electrochemical and electrochromic performances
Incorporation of Co2+, Cu2+, and Zn2+ ions into nickel oxide thin films and their enhanced electrochemical and electrochromic performances
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DOI：
10.20964/2022.01.39
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发表时间：
2022-01
影响因子：
1.5
通讯作者：
Kyung Ho Kim
中科院分区：
文献类型：
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作者：
Kyung Ho Kim
采用溶胶-凝胶旋涂法制备了掺钴、铜和锌的氧化镍薄膜。改变掺杂剂允许调整NiO薄膜的颜色。NiO薄膜的表面上的裂纹被有效地减少通过掺入掺杂剂。未掺杂的NiO和Co掺杂的NiO薄膜具有相对多孔的纳米颗粒结构，而Cu和Zn掺杂的NiO薄膜具有更致密的纳米颗粒结构。与未掺杂的NiO样品相比，掺杂的NiO薄膜的循环伏安（CV）曲线具有更高的积分电流密度。特别地，Co掺杂的NiO薄膜的CV曲线显示随着扫描速率增加没有对称畸变，表明高度可逆的氧化还原过程。在5 mV/s的扫描速率下，计算的面积比电容为19.7 mF/cm，并且其在高扫描速率下显示出优异的循环稳定性（在100 mV/s下2000次循环后约88%的保留率）。Co掺杂的NiO薄膜的颜色从淡粉色（漂白状态）变为棕色（着色状态）。Co掺杂在改善NiO薄膜的电化学和电致变色性能方面表现出了巨大的潜力，同时还提供了长期稳定性和增强的光学调制。
Nickel oxide (NiO) thin films incorporating cobalt (Co), copper (Cu), and zinc (Zn) dopants were prepared using a simple and cost-effective sol-gel spin-coating method. Changing the dopant allowed the color of the NiO thin films to be tuned. Cracking on the surface of the NiO thin films was effectively reduced by the incorporation of dopants. The undoped NiO and Co-doped NiO thin films had a relatively porous nanoparticle structure, whereas the Cu-and Zn-doped NiO thin films had a more compact nanoparticle structure. Compared with the undoped NiO sample, the cyclic voltammetry (CV) curves of the doped NiO thin films exhibited higher integrated current densities. In particular, the CV curves of the Co-doped NiO thin film showed no symmetric distortion as the scan rate increased, indicating a highly reversible redox process. At a scan rate of 5 mV/s, the calculated areal specific capacitance was 19.7 mF/cm, and it showed excellent cycling stability at high scan rate (~88% retention at 100 mV/s after 2000 cycles). The color of the Co-doped NiO thin film changed from pale pink (bleached state) to brown (colored state). Co doping demonstrated great potential for improving the electrochemical and electrochromic performance of NiO thin film, while also offering long-term stability and enhanced optical modulation.