The design and preparation of nanoporous metal (NPM)/metallic oxides (or hydroxides) electrodes with good flexibility as well as high energy storage performance has become a great challenge for applications in wearable electronic products. Herein, we report a novel strategy to synthesize flexible nickel oxide/hydroxide coated nanoporous nickel (np-NiO_xH_y@Ni) electrode containing metallic glass (MG) interlayer (np-NiO_xH_y@Ni/MG/np-NiO_xH_y@Ni sandwich) by one-step dealloying of Ni₄₀Zr₂₀Ti₄₀ MG ribbons. Benefiting from the ductile MG interlayer, the sandwich-like electrode presents excellent flexibility, which has not been reported for other dealloyed porous ribbons. Electrochemical measurements show that the electrode is essentially a battery-type material while it also exhibits pseudocapacitive behavior. Due to an integrated sandwich structure and np-NiO_xH_y@Ni shell@core network, the electrode displays an enhanced capacitance of 778 F cm⁻³ at 1 A cm⁻³ in KOH solutions (achieves 3536.01 F cm⁻³ when just considering the volume of the dealloyed layer) and a remarkable rate performance (80.3 % retention when the current density increase by 128-fold), as well as an outstanding cycle stability (100 % capacitance retention after 8000 cycles). Furthermore, the cable-like all-solid-state flexible supercapacitor (CAFS) device assembled by this flexible electrode can bear a bending of 0–180° without significant performance change. The highest volumetric energy density of 28.52 mW h cm⁻³ with a power density of 0.10 W cm⁻³ is obtained, which far exceeds commercially available supercapacitors (<1 mW h cm⁻³) and thin-film lithium batteries (0.3–10 mW h cm⁻³). Moreover, a wearable system by the integration of the CAFS device with an electronic watch is achieved, which amazingly runs for more than 25 min. The introduction of MG into NPM composites greatly improves the flexibility, which harnesses the promise for applying dealloyed materials in advanced wearable devices.

具有良好的柔韧性以及高能量存储性能的纳米多孔金属（NPM）/金属氧化物（或氢氧化物）电极的设计和制备已经成为可穿戴电子产品中应用的巨大挑战。在这里，我们报告了一种新的策略来合成包含金属玻璃（MG）中间层的柔性氧化镍/氢氧化物涂覆的纳米多孔镍（np-NiO _x H _y @Ni）电极（np-NiO _x H _y @ Ni / MG / np-NiO _x H _y @Ni夹层）通过一步一步脱镍Ni ₄₀ Zr ₂₀ Ti ₄₀MG色带。得益于可延展的MG中间层，这种夹层状电极具有出色的柔韧性，这在其他脱合金多孔带中尚无报道。电化学测量表明，该电极本质上是一种电池型材料，同时还表现出伪电容行为。由于集成的三明治结构和np-NiO _x H _y @Ni shell @ core网络，该电极在KOH溶液中的1 A cm ^-3处显示出778 F cm ^-3的增强电容（达到3536.01 F cm ^-3）当仅考虑脱合金层的体积时）和出色的速率性能（当电流密度增加128倍时保留率为80.3％），以及出色的循环稳定性（在8000次循环后保持100％的电容）。此外，由该柔性电极组装而成的电缆状全固态柔性超级电容器（CAFS）装置可承受0–180°的弯曲，而性能没有明显变化。获得的最高体积能量密度为28.52 mW h cm ^-3，功率密度为0.10 W cm ^-3，远远超过了商用超级电容器（<1 mW h cm ^-3）和薄膜锂电池（0.3-10 mW h cm ^-3）。此外，通过将CAFS设备与电子表集成在一起，可穿戴系统可实现长达25分钟的惊人运行。将MG引入NPM复合材料可极大地提高灵活性，从而充分利用了脱合金材料在高级可穿戴设备中的应用前景。