Wang Mei, Long Yi, Zhao Huifang, Zhang Wenjuan, Wang Liyong, Dong Ruifeng, Hou Hua, Wang Huiqi, Wang Xiaoguang
School of Materials Science and Engineering & School of Energy and Power Engineering & School of Science, North University of China, Taiyuan, 030051, P. R. China.
Department de Química, Universitat Autònoma de Barcelona (UAB), 08193, Bellaterra, Cerdanyola del Vallès, Spain.
ChemSusChem. 2022 Nov 8;15(21):e202201518. doi: 10.1002/cssc.202201518. Epub 2022 Sep 21.
The large-scale fabrication of highly efficient and low-cost bifunctional catalysts for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is critical to the development of rechargeable zinc-air batteries (ZABs). Herein, a scalable dealloying strategy was proposed to obtain hierarchically porous spinel-type oxide with minor hereditary Al doping. Benefiting from the well-structured porosity and native dopant, O-np-Ni Co (Al), namely Al-NiCo O , exhibited excellent electrocatalytic ORR and OER activities, giving a small potential gap of 0.71 V. The rechargeable ZAB with O-np-Ni Co (Al) as cathode catalyst delivered a high specific capacity of 757 mAh g , a competitive peak power density of 142 mW cm , and a long-term discharge-charge cycling stability. Furthermore, density functional theory calculations evidenced that appropriate Al doping into NiCo O could significantly reduce the Gibbs free energy difference to 1.71 eV. This work is expected to inspire the design of performance-oriented bifunctional electrocatalysts for wider applications in renewable energy systems.
大规模制备用于氧还原反应（ORR）和析氧反应（OER）的高效低成本双功能催化剂对于可充电锌空气电池（ZABs）的发展至关重要。在此，提出了一种可扩展的脱合金策略，以获得具有少量遗传性铝掺杂的分级多孔尖晶石型氧化物。受益于结构良好的孔隙率和天然掺杂剂，O-np-Ni Co（Al），即Al-NiCo O，表现出优异的电催化ORR和OER活性，其电位差小至0.71 V。以O-np-Ni Co（Al）作为阴极催化剂的可充电ZAB具有757 mAh g的高比容量、142 mW cm的有竞争力的峰值功率密度以及长期的充放电循环稳定性。此外，密度泛函理论计算证明，向NiCo O中适当掺杂Al可将吉布斯自由能差显著降低至1.71 eV。这项工作有望激发面向性能的双功能电催化剂的设计，以在可再生能源系统中得到更广泛的应用。
