Wang Zining, Wang Hui, Ji Shan, Wang Xuyun, Zhou Pengxin, Huo Shuhui, Linkov Vladimir, Wang Rongfang
State Key Laboratory Base for Eco-Chemical Engineering, College of Chemical Engineering, Qingdao University of, Science and Technology, Qingdao, 266042, China.
College of Biological, Chemical Science and Chemical Engineering, Jiaxing University, Jiaxing, 314001, China.
Chemistry. 2020 Sep 16;26(52):12067-12074. doi: 10.1002/chem.202002310. Epub 2020 Aug 18.
To obtain a highly active, stable, and binder-free electrode based on transition-metal compounds for water splitting, nickel foam-supported 3D NiMoO nanosheet arrays modified with 0D Fe-doped carbon quantum dots (Fe-CQDs/NiMoO /NF) are synthesized. The structure characterizations indicated that 0D Fe-CQDs are evenly dispersed onto the NiMoO sheets of the arrays. The contact angle analysis confirmed that the surface hydrophilia of the arrays is improved after the 0D Fe-CQDs are deposited 3D on the NiMoO sheets. Here, both the activity and durability in electrochemical water splitting are significantly enhanced with the Fe-CQDs/NiMoO /NF catalysts. At a current density of 10 mA cm , the resultant Fe-CQDs/NiMoO /NF revealed an overpotential of only 117 mV for the hydrogen evolution reaction (HER), a relatively low overpotential of 336 mV toward the oxygen evolution reaction (OER), and a Faraday efficiency of up to 99 %. This performance can be attributed to the unique 3D nanosheet array structure, the synergistic effect, and the optimal hydrophilia for gas evolution evolved from the electrode surface.
为了获得一种基于过渡金属化合物的用于水分解的高活性、稳定且无粘结剂的电极，合成了用零维铁掺杂碳量子点修饰的泡沫镍负载的三维NiMoO纳米片阵列（Fe-CQDs/NiMoO /NF）。结构表征表明，零维Fe-CQDs均匀分散在阵列的NiMoO片上。接触角分析证实，在零维Fe-CQDs三维沉积在NiMoO片上后，阵列的表面亲水性得到改善。在此，Fe-CQDs/NiMoO /NF催化剂显著提高了电化学水分解的活性和耐久性。在电流密度为10 mA cm 时，所得的Fe-CQDs/NiMoO /NF在析氢反应（HER）中仅显示117 mV的过电位，在析氧反应（OER）中具有336 mV的相对较低过电位，以及高达99 %的法拉第效率。这种性能可归因于独特的三维纳米片阵列结构、协同效应以及电极表面气体析出的最佳亲水性。
