Zinc-ion hybrid supercapacitors (ZIHCs) hold great promise in the realm of renewable energy storage. However, their development is severely hampered by the unsatisfactory practical capacity and poor stability. Herein, we report an effective strategy to improve the electrochemical performance by constructing hollow bimetallic nitride TiVN (H-TiVN) using a sacrificial template method. The optimized H-TiVN//Zn shows a high capacitance of 183.7 F g^–1 at 0.2 A g^–1 along with excellent stability (an 84.7% capacitance retention after 20,000 cycles at 5 A g^–1). More importantly, the energy density can reach 57.42 Wh kg^–1, accompanied by a power density of 249.35 W kg^–1. Our work not only establishes H-TiVN as a high-performance electrode material for ZIHCs but also provides a general strategy for improving the electrochemical performance of nanomaterial electrodes.

中文翻译：

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用于高性能锌离子混合超级电容器的双金属氮化物 TiVN 空心纳米管

锌离子混合超级电容器（ZIHC）在可再生能源存储领域具有广阔的前景。但实际能力不理想、稳定性差，严重制约了其发展。在此，我们报告了一种通过使用牺牲模板法构建空心双金属氮化物 TiVN (H-TiVN) 来提高电化学性能的有效策略。优化的 H-TiVN//Zn在 0.2 A g ^{–1下表现出 183.7 F g –1}的高电容，并具有出色的稳定性（在 5 A g ^–1下 20,000 次循环后电容保持率为 84.7% ）。更重要的是，能量密度可达57.42 Wh kg ^–1，功率密度为249.35 W kg ^–1。我们的工作不仅确立了 H-TiVN 作为 ZIHC 的高性能电极材料，而且还为提高纳米材料电极的电化学性能提供了总体策略。