Gautam Jagadis, Kannan Karthik, Meshesha Mikiyas Mekete, Dahal Bipeen, Subedi Subhangi, Ni Lubin, Wei Yongge, Yang Bee Lyong
School of Materials Science and Engineering, Kumoh National Institute of Technology, 61 Daehak-ro, Gumi-si, Gyeongsangbuk-do 39177, Republic of Korea; School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, Jiangsu, People's Republic of China; Key Lab of Organic Optoelectronics & Molecular Engineering of Ministry of Education, Department of Chemistry, Tsinghua University, Beijing 100084, People's Republic of China.
School of Materials Science and Engineering, Kumoh National Institute of Technology, 61 Daehak-ro, Gumi-si, Gyeongsangbuk-do 39177, Republic of Korea.
J Colloid Interface Sci. 2022 Jul 15;618:419-430. doi: 10.1016/j.jcis.2022.03.103. Epub 2022 Mar 24.
Electrocatalysts play an important role to increase the energy conversion efficiency of electrolysis processes. In this study, a heterostructure of zinc iron oxide (ZnFeO) and polyoxometalate (POM) nanoplates (POM-ZnFeO) was fabricated for the first time by a hydrothermal process. The hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) analysis of POM-ZnFeO furnished low overpotentials of 268 and 356 mV, and 220 and 290 mV to achieve current densities of 20 and 50 mA cm, respectively. In addition, an electrolytic cell composed of a POM-ZnFeO cathode and anode required an operating voltage of 1.53 V to deliver a current of 10 mA cm. The improved electrochemical performance of POM-ZnFeO compared to commercial and recently reported catalysts is attributed to the high electrocatalytically active surface area, modulation in the electronic and chemical properties and the formation of heterojunction of ZnFeO and POM, which are vital for accelerating HER and OER activity.
电催化剂在提高电解过程的能量转换效率方面发挥着重要作用。在本研究中，首次通过水热法制备了氧化锌铁（ZnFeO）和多金属氧酸盐（POM）纳米片的异质结构（POM-ZnFeO）。对POM-ZnFeO的析氢反应（HER）和析氧反应（OER）分析表明，在分别达到20和50 mA cm的电流密度时，其过电位较低，分别为268和356 mV，以及220和290 mV。此外，由POM-ZnFeO阴极和阳极组成的电解槽在输出10 mA cm的电流时需要1.53 V的工作电压。与商业催化剂和最近报道的催化剂相比，POM-ZnFeO电化学性能的提高归因于其高电催化活性表面积、电子和化学性质的调节以及ZnFeO和POM异质结的形成，这些对于加速HER和OER活性至关重要。
