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Effects of Fe-doping induced by valence modulation engineering on the nickel hydroxyfluoride cathode of hybrid supercapacitors
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2024-07-25 , DOI: 10.1039/d4qi01393j Yutong Zhao 1 , Zeshuo Meng 1 , Jian Xu 1 , Zhengyan Du 1 , Zeyu Hao 1 , Shulong Wang 1 , Hongwei Tian 1 , Zhiqiang Niu 2 , Dawei Su 3
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2024-07-25 , DOI: 10.1039/d4qi01393j Yutong Zhao 1 , Zeshuo Meng 1 , Jian Xu 1 , Zhengyan Du 1 , Zeyu Hao 1 , Shulong Wang 1 , Hongwei Tian 1 , Zhiqiang Niu 2 , Dawei Su 3
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Nickel hydroxyfluoride (NHF) with an elevated theoretical specific capacity has attracted increasing interest for use as an electrode material but its deficient electrical conductivity and inadequate number of active sites have hampered its wide applications. Herein, small amounts of Fe were doped into NHF by a novel single-step solvothermal method. The experimental findings revealed that doping of Fe into NHF accelerated the electron transfer at the Ni sites and promoted the generation of high valence Ni(3+δ)+ for stimulating a two-step reaction. The presence of highly active Ni(3+δ)+ enriched the redox process and effectively enhanced energy storage. At a current density of 1 A g−1, the optimal doped sample NHF-0.03 displayed a maximum specific capacity of 640 C g−1. The assembled NHF-0.03//AC asymmetric supercapacitor exhibited a maximum power density of 750 W kg−1 and a maximum energy density of 55.5 W h kg−1. After 10 000 charge/discharge cycles, the supercapacitor device preserved 77% of its original capacity at a high current density of 15 A g−1, indicating good cycling stability. Overall, the proposed innovative doping strategy looks promising for the enhancement and refinement of materials based on hydroxyfluoride for advanced supercapacitor electrodes.
中文翻译：
价态调制工程诱导Fe掺杂对混合超级电容器羟基氟化镍阴极的影响
具有较高理论比容量的羟基氟化镍（NHF）作为电极材料引起了越来越多的兴趣，但其导电性不足和活性位点数量不足阻碍了其广泛应用。在此，通过一种新颖的单步溶剂热方法将少量 Fe 掺杂到 NHF 中。实验结果表明，将Fe掺杂到NHF中加速了Ni位点的电子转移，并促进了高价Ni (3+δ)+ 的生成，从而刺激了两步反应。高活性Ni (3+δ)+ 的存在丰富了氧化还原过程并有效增强了能量存储。在电流密度为1 A g −1 时，最佳掺杂样品NHF-0.03 显示出最大比容量为640 C g −1 。组装的NHF-0.03//AC非对称超级电容器的最大功率密度为750 W kg −1 ，最大能量密度为55.5 W h kg −1 。经过10 000次充放电循环后，超级电容器在15 A g-1的高电流密度 −1 下仍保持了原始容量的77%，表现出良好的循环稳定性。总体而言，所提出的创新掺杂策略对于增强和细化用于先进超级电容器电极的基于羟基氟化物的材料来说看起来很有前景。
更新日期：2024-07-25
中文翻译：
价态调制工程诱导Fe掺杂对混合超级电容器羟基氟化镍阴极的影响
具有较高理论比容量的羟基氟化镍（NHF）作为电极材料引起了越来越多的兴趣，但其导电性不足和活性位点数量不足阻碍了其广泛应用。在此，通过一种新颖的单步溶剂热方法将少量 Fe 掺杂到 NHF 中。实验结果表明，将Fe掺杂到NHF中加速了Ni位点的电子转移，并促进了高价Ni (3+δ)+ 的生成，从而刺激了两步反应。高活性Ni (3+δ)+ 的存在丰富了氧化还原过程并有效增强了能量存储。在电流密度为1 A g −1 时，最佳掺杂样品NHF-0.03 显示出最大比容量为640 C g −1 。组装的NHF-0.03//AC非对称超级电容器的最大功率密度为750 W kg −1 ，最大能量密度为55.5 W h kg −1 。经过10 000次充放电循环后，超级电容器在15 A g-1的高电流密度 −1 下仍保持了原始容量的77%，表现出良好的循环稳定性。总体而言，所提出的创新掺杂策略对于增强和细化用于先进超级电容器电极的基于羟基氟化物的材料来说看起来很有前景。
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