超级电容器
溶解
四面体
电容
八面体
材料科学
功率密度
电极
配体(生物化学)
锰
格子(音乐)
化学
结晶学
晶体结构
物理化学
热力学
物理
受体
冶金
功率(物理)
生物化学
声学
作者
Chao Wang,Jiaqi Huang,Yin Huang,Xia Li,Wenyao Zhang,Jingwen Sun,Pan Xiong,Yongsheng Fu,Xue Li,Junwu Zhu
标识
DOI:10.1016/j.jpowsour.2023.233462
摘要
Extending the potential range of MnO2 is imperative to improve power density and capacity density for supercapacitors. However, MnO2 usually suffers from severe Mn dissolution, irreversible phase transition, and poor cycling performance under an extended potential range. Herein, a ligand field regulation strategy is rationally designed to enhance the structural stability of δ-MnO2 to extend the potential window to 0–1.3 V (vs. Ag/AgCl). As revealed, the generated strong covalent B–O plane triangle or P–O tetrahedron configuration effectively decreases the lattice O activity of δ-MnO2. The B–O–Mn and P–O–Mn bonding interactions enhance Mn ion crystal field stabilization energy in the MnO6 octahedra. Therefore, the lattice O loss, Mn dissolution, and irreversible phase transition are well suppressed. The PO43− doped δ-MnO2 electrodes (with a high mass loading of ∼10 mg cm−2) can deliver a large specific capacitance (268.3 F g−1 at 0.5 A g−1) and excellent cycling performance (83.5% after 10000 cycles) in the extended potential window of 0–1.3 V (vs. Ag/AgCl). Our ligand field regulation strategy affords opportunities for developing simultaneously high-capacity and high-voltage electrodes for supercapacitors.
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