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首页> 外文期刊>Catalysis science & technology >Bimetallic Ni-Co composites anchored on a wool ball-like carbon framework as high-efficiency bifunctional electrodes for rechargeable Zn-air batteries
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Bimetallic Ni-Co composites anchored on a wool ball-like carbon framework as high-efficiency bifunctional electrodes for rechargeable Zn-air batteries

机译：双金属Ni-Co复合材料固定在羊毛球形碳框架作为高效双官能充电Zn-air电极电池

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摘要

Two-dimensional (2D) graphene nanosheets and one-dimensional (1D) carbon nanotubes were constructed into loosened wool ball-like carbons (NiCo@N-Cs) by a hydrothermal treatment and pyrolysis. The built graphene/nanotube networks show highly accessible 3D open aisles and peculiar microstructures, which not only facilitated mass and electron transport but also increased the active site density. In alkaline solution, the prepared NiCo@N-C-900 exhibits a positive half-wave potential (E-1/2) of 0.88 V for the oxygen reduction reaction and a low overpotential (E-eta) of 0.28 V at a current density of 10 mA cm(-2) for the oxygen evolution reaction, superior to the benchmark Pt/C (E-1/2 = 0.84 V) and IrO2 (E-eta = 0.32 V) catalysts as well as the best Ni-Co electrocatalysts reported in the literature (E-1/2 = 0.87 V, E-eta = 0.31 V). In acidic solution, the activity of the ORR on NiCo@N-C-900 is comparative to that on Pt/C and significantly higher than that of all reported Ni-Co electrocatalysts. The primary zinc-air batteries using NiCo@N-C-900 as the advanced air electrode exhibited higher open-circuit potentials (OCPs), peak power density and rechargeability than the Pt/C-based counterpart. This work provides an effective strategy to prepare high-performance bifunctional electrocatalysts in sustainable energy conversion systems.
机译：二维(2 d)石墨烯nanosheets和一维(1 d)碳纳米管构造成放松羊毛球状碳由热液治疗和(NiCo@N-Cs)热解。显示高度3 d开放通道和访问特殊的微观结构,不仅促进质量和电子传递增加了活性部位密度。解决方案,准备nico@n - c - 900的展品积极的半波电位(E-1/2) 0.88 V氧还原反应和低过电压(E-eta) 0.28 V的电流密度的马10厘米(2)氧进化反应,优于基准Pt / C (E-1/2 =0.84 V)和IrO2 (E-eta = 0.32 V)催化剂以及最好的Ni-Co electrocatalysts报道在文献(E-1/2 = 0.87 V, E-eta = 0.31V)在酸性溶液中,奥尔的活动在nico@n - C - 900是比较Pt / C并显著高于一切报道Ni-Co electrocatalysts。锌空气电池使用nico@n - c - 900作为先进的空气电极表现出更高开路电位((ocp),峰值功率密度和rechargeability比Pt /基于c同行。策略准备高性能双官能electrocatalysts在可持续能源转换系统。

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