An amorphous cobalt boride alloy with high electronic conductivity is fabricated through the liquid‐phase reduction method. Benefiting from large specific surface area and hierarchical pore structure, the as‐synthesized Co‐B nanoflakes expose substantial electrochemical active sites, promote the transfer of electrons and ions, and accelerate the redox kinetic process. The as‐obtained amorphous Co‐B alloy sample displays a specific capacitance of 411 F g⁻¹ at 0.5 A g⁻¹, and with the current density increased to 10 A g⁻¹, it maintains 69% of the initial capacitance. The as‐assembled asymmetric supercapacitor device reveals electrochemical properties comprising an excellent specific capacitance of 64.3 F g⁻¹ at 0.25 A g⁻¹, superior cyclical stability of 105% after 20,000 cycles at 3 A g⁻¹, and maximum energy density of 22.9 Wh kg⁻¹ at a power density of 200.3 W kg⁻¹. This study demonstrates great potential in developing high‐conductivity materials for an asymmetric supercapacitor through utilizing an amorphous cobalt boride alloy as a promising electrode material.

中文翻译：

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液相合成非晶态硼化钴合金作为电化学电容器的电极材料

通过液相还原法制备了具有高电子传导性的非晶态硼化钴合金。得益于较大的比表面积和分层的孔结构，合成后的Co-B纳米片暴露出大量的电化学活性位，促进了电子和离子的转移，并加速了氧化还原动力学过程。所获得的非晶态Co-B合金样品在0.5 A g ^-1时显示出411 F g ^-1的比电容，并且随着电流密度增加到10 A g ^-1，它保持了初始电容的69％。组装后的不对称超级电容器具有电化学性能，在0.25 A g ^-1时具有64.3 F g ^-1的出色比电容的105％，优良循环稳定性20,000个周期在3 A G之后^-1，和22.9瓦公斤的最大能量密度^-1在200.3千克w ^的功率密度^-1。这项研究表明，通过使用非晶硼化钴合金作为有前途的电极材料，在开发用于不对称超级电容器的高电导率材料方面具有巨大潜力。