To enhance energy storage performance via modulation of crystal structure on the molecular level, two series of triethylamine (TEA)‐dependent polyoxometalate (POM) based inorganic‐organic hybrid compounds, [Cu^II(btx)₂]₂[SiW₁₂O₄₀] (SiW‐1), [Cu^I(btx)]₄[SiW₁₂O₄₀] (SiW‐2), [Cu^I₄(btx)₃][SiW₁₂O₄₀] ⋅ 2H₂O (SiW‐3), [{Cu^II₆(btx)₇(H₂O)₁₂}H₄⊂(W₁₂O₄₀)₂] ⋅ 12H₂O (W‐1), [{Cu^II₇(btx)₈(H₂O)₁₀}H₂⊂(W₁₂O₄₀)₂] ⋅ 2H₂O (W‐2) and [{Cu^II₁₀Cu^I₂(btx)₁₁(H₂O)₁₆}H₂⊂(W₁₂O₄₀)₃] ⋅ 6H₂O (W‐3) (btx=1,4‐bis(triazol‐1‐ylmethyl)benzene) have been synthesized and explored as pseudocapacitor electrode materials. Compared to other compounds, SiW‐2 shows a specific capacitance of 110.3 F g⁻¹ at 3.0 A g⁻¹ and only experiences a capacitance loss of 13 % after 1000 cycles at a current density of 18.0 A g⁻¹. More importantly, the two series of compounds can be considered as a model for studying the effects of the molecular structures on the pseudocapacitor performance. The result verifies that besides the type of POM, the capacitance ability of the POM‐based compounds is mainly dominated by the connecting modes of adjacent POM building blocks and the dimension of covalent networks formed by POM building blocks. Thus, this work may open a new avenue to optimize the performance of POM‐based capacitors.

中文翻译：

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通过依赖TEA的受控合成来增强能量存储：基于多金属氧酸盐的无机-有机杂化物的两个系列及其超级电容器特性

为了通过在分子水平上调节晶体结构来提高能量存储性能，使用了两个基于三乙胺（TEA）的多金属氧酸盐（POM）的无机-有机杂化化合物，[Cu ^II（btx）₂ ] ₂ [SiW ₁₂ O ₄₀ ] （SiW ‐ 1），[Cu ^I（btx）] ₄ [SiW ₁₂ O ₄₀ ]（SiW ‐ 2），[Cu ^I ₄（btx）₃ ] [SiW ₁₂ O ₄₀ ] ⋅2H ₂ O（SiW ‐ 3） ，[{Cu^II ₆（BTX）₇（H ₂ O）₁₂ }ħ ₄ ⊂（W ₁₂ ö ₄₀）₂ ]⋅12H ₂ O（w ^ - 1），[{的Cu ^II ₇（BTX）₈（H ₂ O）₁₀ } ħ ₂ ⊂（W ₁₂ ö ₄₀）₂ ]⋅2H ₂ O（w ^ - 2）和[{铜^II ₁₀的Cu^我₂（BTX）₁₁（H ₂ O）₁₆ }ħ ₂ ⊂（W ₁₂ ö ₄₀）₃ ]⋅6H ₂ O（w ^ - 3）（BTX = 1,4-双（三唑-1-基甲基）苯）已被合成并探索作为赝电极材料。与其他化合物相比，SiW - 2在3.0 A g ^-1时的比电容为110.3 F g ^-1，在18.0 A g ^-1的电流密度下经过1000次循环后仅经历13％的电容损耗。更重要的是，可以将这两个系列的化合物视为研究分子结构对伪电容器性能的影响的模型。结果证明，除了POM的类型以外，基于POM的化合物的电容能力还主要受相邻POM结构单元的连接方式以及由POM结构单元形成的共价网络的尺寸的支配。因此，这项工作可能为优化基于POM的电容器的性能开辟新途径。