3D hierarchically porous zinc-nickel-cobalt oxide nanosheets grown on Ni foam as binder-free electrodes for electrochemical energy storage
3D hierarchically porous zinc-nickel-cobalt oxide nanosheets grown on Ni foam as binder-free electrodes for electrochemical energy storage
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在泡沫镍上生长的 3D 分层多孔锌镍钴氧化物纳米片作为电化学储能的无粘合剂电极
DOI：
10.1039/c5ta07258a
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发表时间：
2015-01-01
影响因子：
11.9
通讯作者：
Zhang, Kaili
中科院分区：
文献类型：
--
作者：
Chen, Huixin;Zhang, Qiaobao;Zhang, Kaili
三维（3D）分层多孔过渡金属氧化物，特别是那些涉及不同金属离子的混合价态和由直接生长在导电集电器上的相互连接的纳米构建块构建的过渡金属氧化物，是锂离子电池（LIBs）和超级电容器（SCs）等储能设备的有前途的电极候选者。本研究报告了一种简单且可扩展的化学浴沉积工艺，结合简单的煅烧，用于直接在Ni泡沫上生长三维分层多孔Zn-Ni-Co氧化物（ZNCO）纳米片阵列，具有强大的附着力。然后将所得纳米结构作为lib和SCs的无粘结剂电极进行评估。鉴于其独特的结构和组成优势，该电极在0.2 ag（-1）电流密度下，在50次循环后具有1131 mA h g（-1）的可逆容量，在1000次循环时具有优异的1 ag（-1）高电流密度下的长期循环稳定性，并且在作为锂离子电池阳极测试时具有理想的速率能力。当用于SCs时，电极显示出高比电容（在1 a g（-1）时为1728 F g(-1)），出色的速率能力（从1 a g（-1）到50 a g（-1）的72%电容保持率），以及出色的循环稳定性（在20 a g（-1）电流密度下，5000次循环后的电容为1655 F g(-1)，保持率为108.6%）。总的来说，独特的三维分层多孔氧化锌纳米片在构建高性能储能设备方面具有很大的前景。
Three-dimensional (3D) hierarchically porous transition metal oxides, particularly those involving different metal ions of mixed valence states and constructed from interconnected nano-building blocks directly grown on conductive current collectors, are promising electrode candidates for energy storage devices such as Li-ion batteries (LIBs) and supercapacitors (SCs). This study reports a facile and scalable chemical bath deposition process combined with simple calcination for fabricating 3D hierarchically porous Zn-Ni-Co oxide (ZNCO) nanosheet arrays directly grown on Ni foam with robust adhesion. The resulting nanostructures are then evaluated as a binder-free electrode for LIBs and SCs. Given its unique architecture and compositional advantages, the electrode exhibits a reversible capacity of 1131 mA h g(-1) after 50 cycles at a current density of 0.2 A g(-1), an excellent long-term cycling stability at a high current density of 1 A g(-1) for 1000 cycles, and a desirable rate capability when tested as an anode for LIBs. When used for SCs, the electrode demonstrates a high specific capacitance (1728 F g(-1) at 1 A g(-1)), an outstanding rate capability (72% capacitance retention from 1 A g(-1) to 50 A g(-1)), and an excellent cycling stability (capacitance of 1655 F g(-1) after 5000 cycles at a current density of 20 A g(-1) with 108.6% retention). Overall, the unique 3D hierarchically porous ZNCO nanosheets hold a great promise for constructing high-performance energy storage devices.