Real‐Time Mass Change: An Intrinsic Indicator to Dynamically Probe the Electrochemical Degradation Evolution in WO3
Real‐Time Mass Change: An Intrinsic Indicator to Dynamically Probe the Electrochemical Degradation Evolution in WO3
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DOI：
10.1002/admi.202200340
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发表时间：
2022-06
影响因子：
5.4
通讯作者：
Zhenhua Wang;Xin Zhang;Hongliang Zhang;Fangfang Ge;Qiang Wang;Chengli Zhang;G. Xu;Junhua Gao;A. Rogachev;H. Cao
中科院分区：
文献类型：
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作者：
Zhenhua Wang;Xin Zhang;Hongliang Zhang;Fangfang Ge;Qiang Wang;Chengli Zhang;G. Xu;Junhua Gao;A. Rogachev;H. Cao
虽然三氧化钨（WO3）薄膜被认为是最常用的无机电致变色阴极，但锂离子在其中的不可逆积累导致了循环稳定性的下降。原位监测质量变化对于本质上探测WO3薄膜的动态降解演变至关重要。基于电化学石英晶体微天平分析，提出了一个基于三种载流子（锂离子、高氯酸根离子和碳酸丙烯酯）迁移的传递模型。更高的潜力可以促进大规模运营商的迁移，受益于密集的驱动力。由于质量载体的适度嵌入和最小的摩尔质量差异，在40 mV s−1下观察到优异的电化学可逆性。随着质量载体迁移的进行，WO3膜的连续腐蚀导致电化学降解。结果表明，基于电化学石英晶体微天平的分析为质量载体的嵌入和提取提供了有价值的见解，有利于进一步揭示电化学器件中导电离子不可逆嵌入引起的降解演化。
Although tungsten trioxide (WO3) films are considered as the most popular inorganic electrochromic cathode, the irreversible accumulation of lithium ion in it leads to the degradation of cycling stability. In situ monitoring of mass change is critical to intrinsically probe the dynamical degradation evolution of the WO3 films. Based on electrochemical quartz crystal microbalance analysis, a transfer model based on the migration of three mass carriers (lithium ion, perchlorate ion and propylene carbonate) is proposed. Higher potential can boost the migration of mass carriers, benefiting from the intensive driving force. Due to moderate intercalation of mass carriers and smallest difference in molar mass, the excellent electrochemical reversibility at 40 mV s−1 is observed. As the migration of mass carriers progresses, continuous corrosion of the WO3 films results in electrochemical degradation. It is demonstrated that electrochemical quartz crystal microbalance‐based analyses provide a valuable insight for the intercalation and extraction of mass carriers, in favor of further revealing degradation evolution induced by the irreversible intercalation of conductive ions in electrochemical devices.