High entropy promoted active site in layered double hydroxide for ultra-stable oxygen evolution reaction electrocatalyst

High-entropy layered hydroxide for efficient and sustainable seawater oxidation

“…In the current year, few reports are available on high-entropy LDHs for efficient OER activity. 30–33 Wang and his co-workers 30 developed high-entropy MnFeCoNiCu-LDH decorated with Au single atoms along with oxygen vacancies, which exhibited a low overpotential of 213 mV at 10 mA cm −2 current density, and very importantly, delivered good stability over 700 h at an operating current density of 100 mA cm −2 in alkaline fresh water. Li and his co-workers 31 reported the development of HE-LDH composed of transition metals Ni, Fe, Mn, Zn, and Co in the form of metal hydroxides.…”

“…This composition exhibited a small η 10 value of 183 mV, although it increased to 327 mV at 100 mA cm −2 towards the OER mechanism and showed moderate stability over 28 h at a current density of 250 mA cm −2 in alkaline fresh water. Ting and his group 32 developed high-entropy FeNiCoMnCr LDH, which showed excellent activity in alkaline freshwater, exhibiting a low overpotential of 218 mV at a current density of 50 mA cm −2 , and the formation of highly active NiOOH was considered to be reason behind this excellent activity. The electrocatalyst delivered great stability over 600 h at a current density of 400 mA cm −2 in alkaline medium.…”

High-Entropy Layered Double Hydroxides with Highly Adjustable Components for Enhancing Electrocatalytic Oxygen Evolution

“…For example, Hu Liangbing and others reported the ultrafast synthesis of high-entropy sulfide (CrMnFeCoNi)­S x and its excellent OER activity; Dai Sheng et al synthesized high entropy perovskite fluoride and showed excellent OER performance in the OER test . Wang Shuangyin and other research teams have also reported on the study of layered bimetallic hydroxide (HELDH) as OER catalysts. − Although there are many reports on the application of high-entropy materials to the OER, there is still no detailed study of HELDH on universal synthesis and in-depth OER research. Therefore, the controllable synthesis of high entropy layered bimetallic hydroxide (HELDH) in a wide range of components is crucial for the application of high entropy materials to advanced high-performance OER catalysts.…”

FeCoCuMnRuB Nanobox with Dual Driving of High-Entropy and Electron-Trap Effects as the Efficient Electrocatalyst for Water Oxidation

“…The O 1s spectrum (Figure S22) identifies the lattice oxygen (O L , 529.80 eV), oxygen vacancy (O V , 531.41 eV), and adsorbed oxygen (O Ads , 532.36 eV). 30,31 The stronger EPR signal (Figure S23) signifies the increased O V , which arises from the dynamic change of surface atom arrangement induced by the etching of Cu and B atoms, leading to the lattice defects. 32 Besides, Figure S24 exhibits that Fe, Co, Cu, Mn, Ru, B, and O elements are evenly distributed despite experiencing chemical reconstruction and partial etching during the OER process.…”

“…In Figure a, no characteristic Raman peaks are detected before imposing the bias voltage, signifying the resting state of the FeCoCuMnRu alloy. When the voltage increased to 1.2 V, four Raman peaks at 453, 581 cm –1 and 607, 667 cm –1 emerge which are attributed to the vibrations of M–O and M–OH in metal oxides/hydroxides, , implying an initial surface reconstruction of FeCoCuMnRu alloy. Unfortunately, they are not the most beneficial substances for OER.…”