Ni(OH)₂ nanosheets (NSs) were grown onto an electrochemically activated carbon cloth (ECC) with a self-supported microstructure by using efficient ethanol assisted supercritical deposition method. Benefited from the structural features of the well-developed porous architecture with effective channels for electrolyte ions diffusion and accessible redox sites, the nano-heterostructure brings a high utilization of electroactive material and thereby good electrochemical performance. The specific capacity of 918 mC cm⁻² at 2 mA cm⁻² with good rate performance (68.4 % retention at 20 mA cm⁻²) was achieved for the obtained Ni(OH)₂ NSs/ECC flexible electrode. The assembled flexible solid-state device with a 1.8 V operating potential displays an energy density of 8.3 mW h cm^-3 at 20 mW cm^-3. Additionally, the as-fabricated device reveals cyclic stability with 87 % capacity retention (10,000 cycles at 50 mA cm⁻²). These results show the importance of supercritical fluid deposition as a potential method for supercapacitors electrode.

通过使用高效的乙醇辅助超临界沉积方法，将Ni（OH）₂纳米片（NSs）生长在具有自支撑微结构的电化学活性炭布（ECC）上。得益于发达的多孔结构的结构特征，该结构具有有效的电解质离子扩散通道和可访问的氧化还原位点，纳米异质结构带来了电活性材料的高利用率，从而具有良好的电化学性能。对于所获得的Ni（OH）_2，在2 mA cm ^-2时的比容量为918 mC cm ^-2，具有良好的速率性能（在20 mA cm ^-2时保留率为68.4％）。NSs / ECC柔性电极。用1.8 V工作电位显示器的8.3毫瓦高厘米的能量密度组装的柔性固态器件^-3以20mW厘米^-3。另外，所制造的装置显示出具有87％容量保持率的循环稳定性（在50 mA cm ^-2时10,000个循环）。这些结果表明，超临界流体沉积作为超级电容器电极的潜在方法的重要性。