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Material Sciences 2024
一种嵌入钴铁合金的氮掺杂碳纳米管应用于锌空气电池
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Abstract:
开发一种高活性、高稳定性的可逆析氧/氧还原反应(OER/ORR)双功能非贵金属电催化剂对于可充电锌–空气电池的商业化至关重要。在此，我们通过简单的热解策略，成功地构建了一种嵌入CoFe合金N掺杂碳纳米管(CoFe-NCNTs)的强效双功能氧电催化剂。钴铁合金作为双功能催化剂中最为优异的活性位点，而N掺杂碳纳米管又在增强导电性以及串联各个活性位点方面有着卓越的表现。因此，CoFe-NCNTs在ORR (E1/2 = 0.88 V)和OER (EJ=10 = 324 mV)分别表现出优异的氧催化性能。此外，基于CoFe-NCNTs的水性锌–空气电池的开路电压高达1.59 V，功率密度高达168 mW？cm？2，充放电稳定性高达800 h。
The development of a highly active and stable bifunctional non-precious metal electrocatalyst for reversible oxygen precipitation/oxygen reduction reaction (OER/ORR) is crucial for the commercialisation of rechargeable zinc-air batteries. Here, we successfully constructed a potent bifunctional oxygen electrocatalyst embedded with CoFe alloy N-doped carbon nanotubes (CoFe-NCNTs) by a simple pyrolysis strategy. The CoFe alloy serves as the most excellent active site in the bifunctional catalyst, and the N-doped carbon nanotubes are excellent in enhancing the elec-trical conductivity as well as tandemly connecting the individual active sites. As a result, CoFe-NCNTs exhibited excellent oxygen catalysis performance at ORR (E1/2 = 0.88 V) and OER (EJ=10 = 324 mV), respectively. In addition, the aqueous zinc-air batteries based on CoFe-NCNTs exhibited an open-circuit voltage as high as 1.59 V, a power density as high as 168 mW？cm？2, and a charge/discharge stability of up to 800 h.
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