锡量子点制备及其电催化还原二氧化碳产甲酸性能  

Sn Quantum Dots for Electrocatalytic Reduction of CO_(2) to HCOOH

作　　者：田建建 马霞 王敏[1] 姚鹤良 华子乐[1] 张玲霞[1,2,3] TIAN Jianjian;MA Xia;WANG Min;YAO Heliang;HUA Zile;ZHANG Lingxia(State Key Laboratory of High Performance Ceramics and Superfine Microstructure,Shanghai Institute of Ceramics,Chinese Academy of Sciences,Shanghai 200050,China;Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China;School of Chemistry and Materials Science,Hangzhou Institute for Advanced Study,University of Chinese Academy of Sciences,Hangzhou 310024,China)

机构地区：[1]中国科学院上海硅酸盐研究所高性能陶瓷和超微结构国家重点实验室,上海200050 [2]中国科学院大学材料科学与光电工程中心,北京100864 [3]国科大杭州高等研究院化学与材料科学学院,杭州310024

出　　处：《无机材料学报》2021年第12期1337-1342,I0009-I0011,共9页Journal of Inorganic Materials

基　　金：National Key R&D Program of China(2017YFE0127400);National Natural Science Foundation of China(51872317,21835007);Science and Technology Commission of Shanghai(20520711900)。

摘　　要：锡基材料在自然界含量丰富、价格低廉,在电催化还原CO_(2)制液体燃料反应中具有巨大潜力。但是较低的产物选择性和较差的稳定性限制了其应用。本工作制备的锡量子点电催化剂(Sn-QDs),具有高效、高稳定性和高选择性的电催化还原CO_(2)产HCOOH活性。Sn-QDs的平均颗粒尺寸仅为2~3nm,结晶性良好。小的颗粒尺寸增大了电化学活性面积(ECSA),Sn-QDs的ECSA约为锡颗粒的4.4倍。ECSA增大以及CO_(2)还原反应动力学加速,促进了CO_(2)电化学转化。在–1.0V(vsRHE)下,Sn-QDs/CN催化剂的HCOOH法拉第效率(F_(EHCOOH))达到95%,并且在宽约0.5 V的电势范围内能够保持在83%以上。此外,Sn-QDs/CN可以在24 h内保持良好的电化学稳定性。Sn based materials, as low-cost and earth-abundant electrocatalysts, are potential candidates for CO;reduction reaction(CO_(2)RR) into liquid fuels. Unfortunately, the low selectivity and stability limits their applications. Herein, we developed an electrocatalyst of Sn quantum dots(Sn-QDs) for efficient, durable and highly selective CO_(2) reduction to HCOOH. The Sn-QDs were confirmed with high crystallinity and an average size of only 2–3 nm. Small particle size endowed the electrocatalyst with improved electrochemical active surface area(ECSA), which was about 4.4 times of that of Sn particle. This enlarged ECSA as well as accelerated CO;RR kinetics favored the electrochemical conversion of CO_(2). The Faradaic efficiency of HCOOH(FE) on Sn-QDs/CN reached up to 95% at –1.0 V(vs RHE), which exceeded 83% in the recorded wide potential window of 0.5 V. Moreover, the Sn-QDs electrocatalyst exhibited good electrochemical durability for 24 h.

关 键 词：CO 还原 锡量子点 HCOOH 电催化剂 

分 类 号：TQ225.121[化学工程—有机化工] TQ426