Cobalt Single Atoms Immobilized N-Doped Carbon Nanotubes for Enhanced Bifunctional Catalysis toward Oxygen Reduction and Oxygen Evolution Reactions
Cobalt Single Atoms Immobilized N-Doped Carbon Nanotubes for Enhanced Bifunctional Catalysis toward Oxygen Reduction and Oxygen Evolution Reactions
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DOI：
10.1021/acsaem.8b00490
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发表时间：
2018-07-01
影响因子：
6.4
通讯作者：
Zhang, Guangjin
中科院分区：
文献类型：
--
作者：
Dilpazir, Sobia;He, Hongyan;Zhang, Guangjin
用双氰胺(DCD)处理分子筛咪唑骨架(ZIF-67)，通过结构工程合成了新型的Co原子固定碳纳米管(CoSAs@CNTs)。钴原子固定的碳纳米管具有独特的形貌和良好的电化学性能。该电催化剂在碱性介质中表现出高达0.99V的高正起始电位和0.86V的半波电位，均高于商品铂/碳催化剂，且电流密度也大于铂/碳催化剂。在酸性介质中也观察到了良好的性能。这种电催化剂在恶劣环境中具有极高的稳定性。该电催化剂在析氧反应(OER)中表现出良好的性能，而对于双功能电催化，在300 mV的低过电位下观察到0.78V的小过电压，这表明它在实际的能量转换和存储系统中具有优势。这一新颖的研究可能为燃料电池技术提供新的路线图。
Novel Co atoms immobilized carbon nanotubes (CoSAs@CNTs) are synthesized by structural engineering of the zeolitic imidazolate framework (ZIF-67) upon treatment with dicyandiamide (DCD). A unique morphology and prom ising electrochemical performance are shown by the Co atoms immobilized CNTs. The electrocatalyst remarkably exhibits a highly positive onset potential of 0.99 V and half-wave potential of 0.86 V, both even more positive than the commercial Pt/C catalyst, and the current density is also greater than that of the Pt/C catalyst in alkaline media. A decent performance is observed in acidic media also. The electrocatalyst is extraordinarily stable to harsh environments. A promising performance for the oxygen evolution reaction (OER) is demonstrated by the electrocatalyst, while for bifunctional electrocatalysis a small overvoltage of 0.78 V is observed with onset potential at the lower overpotential of 300 mV announcing the advantage of its usage for practical energy conversion and storage systems. This novel study may provide a new road map for fuel cell technology.