Abstract In this paper, a facile co-electrophoretic/electrodeposition method is reported to simple embedding a binder-free composite of porous oxygen-functionalized graphitic carbon nitride (O@g-C3N4)/nickel hydroxide nanoparticles (Ni(OH)2 NPs) into porous nickel-foam (NF) support. The prepared samples are analyzed using FT-IR, Raman, XRD, TGA/DSC, FE-SEM and TEM techniques. The analyses results proved formation of mixed α/β-Ni(OH)2 NPs onto the surface of O@g-C3N4 layers electrophoretically embedded onto NF support. The electrochemical charge storing ability of the fabricated O@g-C3N4/Ni(OH)2/NF electrode was evaluated in KOH electrolyte, and its specific capacity value was calculated to be as high as 967 C g−1, which was higher than those of pristine Ni(OH)2/NF and O@g-C3N4/NF electrodes (i.e. 754.8 C g‒1 and 287 C g‒1, respectively). Furthermore, O@g-C3N4/Ni(OH)2/NF exhibited an outstanding cycling stability of 94.4% after 5000 cycles at 3 A g‒1, which was higher than the long-term stability delivered by Ni(OH)2/NF electrode (i.e. 77.5% at 3 A g‒1). EIS data revealed that the fabricated O@g-C3N4/Ni(OH)2/NF hybrid electrode had lower internal resistance and smaller charge transfer resistance confirming its higher charge transfer rate and better electrical conductivity in comparison to pristine Ni(OH)2/NF electrode.

中文翻译：

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氧功能化 g-C3N4 层固定有 Ni(OH)2 纳米粒子，组装到泡沫镍上作为超级电容器的无粘合剂优秀电极

摘要 本文报道了一种简便的共电泳/电沉积方法，可以简单地嵌入多孔氧功能化石墨氮化碳 (O@g-C3N4)/氢氧化镍纳米粒子 (Ni(OH)2 NPs) 的无粘合剂复合材料。成多孔镍泡沫 (NF) 载体。使用 FT-IR、拉曼、XRD、TGA/DSC、FE-SEM 和 TEM 技术分析制备的样品。分析结果证明在电泳嵌入 NF 载体上的 O@g-C3N4 层表面上形成了混合的 α/β-Ni(OH)2 NPs。在KOH电解液中评估了制备的O@g-C3N4/Ni(OH)2/NF电极的电化学电荷存储能力，计算其比容量值高达967 C g-1，高于原始 Ni(OH)2/NF 和 O@g-C3N4/NF 电极的那些（即分别为 754.8 C g-1 和 287 C g-1）。此外，O@g-C3N4/Ni(OH)2/NF 在 3 A g-1 下循环 5000 次后表现出 94.4% 的出色循环稳定性，高于 Ni(OH)2/ NF 电极（即 3 A g-1 时为 77.5%）。EIS数据显示，与原始Ni(OH)2/相比，制造的O@g-C3N4/Ni(OH)2/NF混合电极具有更低的内阻和更小的电荷转移电阻，证实了其更高的电荷转移率和更好的导电性。 NF 电极。