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Direct conversion of solid g-C3N4 into metal-ended N-doped carbon nanotubes for rechargeable Zn–air batteries
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2022-05-27 , DOI: 10.1039/d2qi00010e Zixuan Zhang 1 , Yin Wang 1 , Jingqi Guan 2 , Tingting Zhang 1 , Peihe Li 1 , Yin Hao 1 , Limei Duan 1 , Zhiqiang Niu 3 , Jinghai Liu 1
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2022-05-27 , DOI: 10.1039/d2qi00010e Zixuan Zhang 1 , Yin Wang 1 , Jingqi Guan 2 , Tingting Zhang 1 , Peihe Li 1 , Yin Hao 1 , Limei Duan 1 , Zhiqiang Niu 3 , Jinghai Liu 1
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Developing low-cost and bifunctional electrocatalysts with activity for the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is highly desirable for metal–air batteries. Herein, we demonstrate an approach to realize the direct conversion of two-dimensional (2D) graphitic carbon nitride (g-C3N4) into one-dimensional (1D) metal-ended nitrogen doped carbon nanotubes (M–NCNTs). For Co–NCNTs, Co@CoOx nanoblocks were found at the end of the nanotubes. The Co@CoOx nanoparticles in Co–NCNTs can be chemically modulated by acid etching to endow them with catalytic activity towards the ORR and OER. After nitric acid (HNO3) etching, the Co–NCNTs–N shows superior activity both in the ORR with an onset potential of 0.86 V and a half-wave potential of 0.80 V and in the OER with a potential of 1.58 V at 10 mA cm−2. Assembled in Zn–air batteries, the Co–NCNTs–N electrode also presents an ultrahigh power density of 210 mW cm−2, a small charge–discharge voltage gap of 0.80 V and a good stability of 130 hours, outperforming the commercial Pt/C–RuO2 electrode.
中文翻译：
将固体 g-C3N4 直接转化为金属端 N 掺杂碳纳米管用于可充电锌空气电池
开发具有氧还原反应（ORR）和析氧反应（OER）活性的低成本和双功能电催化剂对于金属-空气电池来说是非常可取的。在此，我们展示了一种实现将二维（2D）石墨碳氮化物（gC 3 N 4）直接转化为一维（1D）金属端氮掺杂碳纳米管（M-NCNT）的方法。对于 Co-NCNT，在纳米管末端发现了Co@CoO x纳米块。Co-NCNTs中的Co@CoO x纳米颗粒可以通过酸蚀刻进行化学调节，赋予它们对ORR和OER的催化活性。硝酸（HNO 3) 蚀刻，Co-NCNTs-N 在起始电位为 0.86 V 和半波电位为 0.80 V 的 ORR 和在 10 mA cm -2的电位为 1.58 V 的 OER 中均显示出优异的活性。组装在锌空气电池中的Co-NCNTs-N电极还具有210 mW cm -2的超高功率密度、0.80 V的小充放电电压差和130小时的良好稳定性，优于商业Pt/ C-RuO 2电极。
更新日期：2022-05-27
中文翻译：
将固体 g-C3N4 直接转化为金属端 N 掺杂碳纳米管用于可充电锌空气电池
开发具有氧还原反应（ORR）和析氧反应（OER）活性的低成本和双功能电催化剂对于金属-空气电池来说是非常可取的。在此，我们展示了一种实现将二维（2D）石墨碳氮化物（gC 3 N 4）直接转化为一维（1D）金属端氮掺杂碳纳米管（M-NCNT）的方法。对于 Co-NCNT，在纳米管末端发现了Co@CoO x纳米块。Co-NCNTs中的Co@CoO x纳米颗粒可以通过酸蚀刻进行化学调节，赋予它们对ORR和OER的催化活性。硝酸（HNO 3) 蚀刻，Co-NCNTs-N 在起始电位为 0.86 V 和半波电位为 0.80 V 的 ORR 和在 10 mA cm -2的电位为 1.58 V 的 OER 中均显示出优异的活性。组装在锌空气电池中的Co-NCNTs-N电极还具有210 mW cm -2的超高功率密度、0.80 V的小充放电电压差和130小时的良好稳定性，优于商业Pt/ C-RuO 2电极。
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