摘要
Neutral Zn-air batteries(ZABs) have attracted much attention due to the enhanced lifespan and stability.However, their development is suppressed by the poor catalytic properties of the air-electrocatalysts for oxygen reduction reaction(ORR) and oxygen evolution reaction(OER). Hence,the exploration of highly efficient electrocatalysts for neutral ZABs is critical. Herein, we designed an economical heterostructure of Pt nanoparticle-modified Zn nanoplates(Pt/Zn NPs). Compared with commercial Pt/C electrocatalyst, our Pt/Zn heterostructure exhibits comparable catalytic properties and ultrahigh stability in neutral media. The heterostructure can reduce the dosage of Pt and offer sufficient active sites,resulting in enhanced catalytic properties for ORR/OER in neutral media. When applied to neutral ZABs as air cathode,our heterostructure exhibits a high power density of 45 mW cm^(-2) and excellent stability of more than 850 cycles with negligible decay, making it the most efficient and robust one in neutral electrolyte. This approach opens a new avenue to strategically design catalysts with high activity for neutral ZABs, rendering them potential in portable and wearable electronic devices.
相比于传统碱性锌空气电池,中性锌空气电池因为其长寿命和高稳定性吸引了越来越多的关注.但中性锌空气电池的发展因空气催化剂的氧还原(ORR)和氧析出(OER)性能差而受到了限制.因此,开发用于中性锌空气电池的高效催化剂非常必要.本工作利用Pt纳米颗粒修饰Zn纳米片(Pt/Zn NPs),制备了经济型异质结构催化剂.相对于商用Pt/C催化剂,我们的复合材料催化剂在中性电解液中具有和Pt/C相媲美的催化性能和高稳定性.这是因为Pt/Zn NPs复合材料不仅可以减少Pt的用量,还提供了丰富的活性位点.采用Pt/Zn NPs组装的中性锌空气电池,具有45 mW cm^(-2)的高功率密度和超过850个循环的持久稳定性,可高效稳定地应用于中性电解液中.本工作为应用于中性锌空气电池的高活性催化剂的研发提供了指导,使其在柔性可穿戴器件中更具应用前景.
作者
Yongyin Liang
Hang Lei
Songjie Wang
Zilong Wang
Wenjie Mai
梁咏茵;雷航;王松洁;王子龙;麦文杰(Siyuan Laboratory,Guangdong Provincial Engineering Technology Research Center of Vacuum Coating Technologies and New Energy Materials,Department of Physics,Jinan University,Guangzhou 510632,China;Department of Chemistry,Jinan University,Guangzhou 510632,China)
基金
financially supported by the National Natural Science Foundation of China (21706090 and 51772135)
the Ministry of Education of China (6141A02022516)
the Natural Science Foundation of Guangdong Province (2014A030306010)
Jinan University (88016105)
the Natural Science Foundation of Guangzhou (201904010049)
the Fundamental Research Foundation for the Central Universities (21617326)。
