A nitrogen-doped NiCo2S4/CoO hollow multi-layered heterostructure microsphere for efficient oxygen evolution in Zn-air batteries
A nitrogen-doped NiCo2S4/CoO hollow multi-layered heterostructure microsphere for efficient oxygen evolution in Zn-air batteries
复制标题
氮掺杂 NiCo2S4/CoO 中空多层异质结构微球可在锌空气电池中高效析氧
作者：
He Bin;Song Juan-Juan;Xiao-Yu Li;Chun-Yu Xu;Yi-Bo Li;Ya-Wen Tang;Qing-Li Hao;Hong-Ke Liu;Zhi Su
开发高效、低成本的非贵金属基析氧反应电催化剂是可再生能源转换和金属-空气电池的关键。本文报道了一种新型高效的氮掺杂氧化物/硫化物异质结催化剂(N-NiCo2S4/CoO微球)。N-NiCo2S4/CoO微球由NiCo-BTC MOF经热处理得到多层空心结构的NiCo2O4微球，然后在NH4HCO3存在下直接硫化，形成氧化物/硫化物异质结。N-NiCo2S4/CoO微球由于氮的掺杂、丰富的多层空心异质结和多组分的界面，表现出了良好的OER活性，在10 mA cm−2时的过电势为227 mV。基于N-NiCo2S4/CoO+Pt/C催化剂的锌空气电池在5 mA cm−2的大电流密度下循环900次后表现出良好的循环稳定性，其中商品化的RuO2+铂/C电池仅循环30次就出现了较大的下降，这表明其作为电源器件具有很大的应用前景。
Exploring highly effective and low-cost non-noble metal-based electrocatalysts for oxygen evolution reaction (OER) is critical for renewable energy conversion and metal–air batteries. Herein, a novel and high-efficient OER catalyst was reported with nitrogen-doped oxide/sulfide heterostructures (named N-NiCo2S4/CoO microsphere). The N-NiCo2S4/CoO microsphere was synthesized by annealing NiCo-BTC MOF to a multi-layered hollow structure of NiCo2O4 microspheres, followed by the direct vulcanization in the presence of NH4HCO3, resulting in an oxide/sulfide heterojunction. Benefiting from the nitrogen doping, the abundant multi-layered hollow heterostructure and the interfaces between multiple components, the N-NiCo2S4/CoO microsphere exhibited excellent OER activity with a low overpotential of 227 mV at 10 mA cm−2. The Zn–air battery based on the N-NiCo2S4/CoO + Pt/C catalyst displayed excellent cycling stability after 900 cycles at a large current density of 5 mA cm−2, where the commercial RuO2 + Pt/C-based battery exhibited a big drop after only 30 cycles, suggesting its great application prospects as power source devices.