Different metal–organic units were introduced into the {PMo₁₂} polyoxometalate (POM) system to yield three porous coordination polymers with distinct characteristics, {Cu(pra)₂}[{Cu(pra)₂}₃{PMo₁₁^VIMo^VO₄₀}] (1), [{Ag₅(pz)₆(H₂O)_0.5Cl}{PMo₁₁^VIMo^VO₄₀}] (2), and [{Cu₃(bpz)₅(H₂O)}{PMo₁₂O₄₀}] (3) (pra = pyrazole; pz = pyrazine; bpz = benzopyrazine), via an in situ hydrothermal method. In comparison with the maternal Keggin cluster and most reported POM electrode materials, compounds 1–3 exhibit larger specific capacitances (672.2, 782.1, and 765.2 F g^–1 at a current density of 2.4 A g^–1, respectively), superior cyclic stability (91.5%, 89.3%, and 87.8% of cycle efficiency after 5000 cycles, respectively), and boosted conductivity, which may be attributed to the introduction of metal–organic units. The result indicates that metal–organic units can effectively enhance the capacitance performance of POMs. This may be due to the fact that they provide additional redox centers, induce the formation of stable porous structures, and improve ion/electron transfer efficiency. Compounds 1–3 present excellent electrocatalytic activity in reducing peroxide (H₂O₂) and oxidizing ascorbic acid (AA). In addition, compound 2 shows an outstanding sensing performance detection of AA and H₂O₂.

中文翻译：

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用于改善电化学电容、双功能电催化和传感性能的 Cu/Ag 复合物改性 Keggin 型配位聚合物

将不同的金属有机单元引入 {PMo ₁₂ } 多金属氧酸盐 (POM) 系统中，产生三种具有不同特性的多孔配位聚合物，{Cu(pra) ₂ }[{Cu(pra) ₂ } ₃ {PMo ₁₁ ^VI Mo ^V O ₄₀ }] ( 1 )、[{Ag ₅ (pz) ₆ (H ₂ O) _0.5 Cl}{PMo ₁₁ ^VI Mo ^V O ₄₀ }] ( 2 ) 和 [{Cu ₃ (bpz) ₅ (H ₂ O)}{PMo ₁₂ O ₄₀}] ( 3 )（pra = 吡唑；pz = 吡嗪；bpz = 苯并吡嗪），通过原位水热法。与母体的Keggin簇和报道最多的POM电极材料相比，化合物1 - 3表现出较大的比电容（672.2，782.1，和765.2 F G ^-1在2.4克的电流密度^-1，分别）、优异的循环稳定性（5000 次循环后循环效率分别为 91.5%、89.3% 和 87.8%）和提高的导电性，这可能归因于金属有机单元的引入。结果表明金属有机单元可以有效提高 POM 的电容性能。这可能是因为它们提供了额外的氧化还原中心，诱导了稳定多孔结构的形成，并提高了离子/电子转移效率。化合物1 - 3在减少过氧化物（H本优良的电催化活性₂ ö ₂）和氧化抗坏血酸（AA）。此外，化合物2显示了对 AA 和 H ₂的出色传感性能检测○ ₂。