Designed Formation of Co3O4/NiCo2O4Double-Shelled Nanocages with Enhanced Pseudocapacitive and Electrocatalytic Properties,Journal of the American Chemical Society

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Designed Formation of Co3O4/NiCo2O4Double-Shelled Nanocages with Enhanced Pseudocapacitive and Electrocatalytic Properties
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2015-04-21 , DOI: 10.1021/jacs.5b02465
Han Hu ₁ , Buyuan Guan ₁ , Baoyu Xia ₁ , Xiong Wen (David) Lou ₁

Affiliation

Hollow structures with high complexity in shell architecture and composition have attracted tremendous interest because of their great importance for both fundamental studies and practical applications. Herein we report the designed synthesis of novel box-in-box nanocages (NCs) with different shell compositions, namely, Co3O4/NiCo2O4 double-shelled nanocages (DSNCs). Uniform zeolitic imidazolate framework-67/Ni-Co layered double hydroxides yolk-shelled structures are first synthesized and then transformed into Co3O4/NiCo2O4 DSNCs by thermal annealing in air. Importantly, this strategy can be easily extended to prepare other complex DSNCs. When evaluated as electrodes for pseudocapacitors, the Co3O4/NiCo2O4 DSNCs show a high specific capacitance of 972 F g(-1) at a current density of 5 A g(-1) and excellent stability with 92.5% capacitance retention after 12 000 cycles, superior to that of Co3O4 NCs with simple configuration and Co3O4/Co3O4 DSNCs. Besides, the Co3O4/NiCo2O4 DSNCs also exhibit much better electrocatalytic activity for the oxygen evolution reaction than Co3O4 NCs. The greatly improved electrochemical performance of Co3O4/NiCo2O4 DSNCs demonstrates the importance of rational design and synthesis of hollow structures with higher complexity.

中文翻译：

具有增强的赝电容和电催化性能的 Co3O4/NiCo2O4 双壳纳米笼的设计形成

由于其对基础研究和实际应用的重要性，在壳结构和组成方面具有高度复杂性的空心结构引起了极大的兴趣。在此，我们报告了具有不同壳组成的新型盒中盒纳米笼 (NC) 的设计合成，即 Co3O4/NiCo2O4 双壳纳米笼 (DSNC)。首先合成均匀的沸石咪唑酯骨架-67/Ni-Co 层状双氢氧化物蛋黄壳结构，然后通过在空气中热退火转化为 Co3O4/NiCo2O4 DSNC。重要的是，此策略可以轻松扩展以准备其他复杂的 DSNC。当评估为赝电容器的电极时，Co3O4/NiCo2O4 DSNC 在 5 A g(-1) 的电流密度下显示出 972 F g(-1) 的高比电容和 92 的出色稳定性。12 000 次循环后电容保持率为 5%，优于配置简单的 Co3O4 NCs 和 Co3O4/Co3O4 DSNCs。此外，Co3O4/NiCo2O4 DSNCs 对析氧反应的电催化活性也比 Co3O4 NCs 好得多。Co3O4/NiCo2O4 DSNC 的电化学性能大大提高，证明了合理设计和合成具有更高复杂性的空心结构的重要性。

更新日期：2015-04-21

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