Highly exposed NiFeO_(x) nanoclusters supported on boron doped carbon nanotubes for electrocatalytic oxygen evolution reaction  

作　　者：Liyang Lv Bing Tang Qianqian Ji Na Li Yao Wang Sihua Feng Hengli Duan Chao Wang Hao Tan Wensheng Yan 

机构地区：[1]National Synchrotron Radiation Laboratory,University of Science and Technology of China,Hefei 230026,China

出　　处：《Chinese Chemical Letters》2023年第3期209-213,共5页中国化学快报（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Nos.11975234,11775225,12075243 and 12005227);excellence program of Hefei science center CAS,(Nos.2019HSC-UE002,2020HSC-UE002,2020HSCCIP013);the National Key Research and Development Program of China(No.2021YFA1600800);the financial support by Postdoctoral Science Foundation of China(Nos.2019M662202,2020M682041,2020TQ0316)。

摘　　要：The development of efficient and cost-effective electrocatalysts for oxygen evolution reaction(OER) is crucial for the overall water splitting. Herein, we prepared a highly exposed NiFeO_(x) ultra-small nanoclusters supported on boron-doped carbon nonotubes catalyst, which achieves a 10 mA/cm^(2) anodic current density at a low overpotential of 213 mV and the Tafel slope of 52 mV/dec in 1.0 mol/L KOH, superior to the pristine NiFeO_(x)-CNTs and other state-of-the-art OER catalysts in alkaline media. A combination study(XPS, sXAS and XAFS) verifies that the local atomic structure of Ni and Fe atoms in the nanoclusters are similar to NiO and Fe_(2)O_(3), respectively, and the B atoms which are doped into the crystal lattice of CNTs leads to the optimization of Ni 3d egorbitals. Furthermore, in-situ X-ray absorption spectroscopies reveal that the high valence state of Ni atoms are served as the real active sites. This work highlights that the precise control of highly exposed multicomponent nanocluster catalysts paves a new way for designing highly efficient catalysts at the atomic scale.

关 键 词：Highly exposed Electrocatalyst In-situ XAFS B-dope CNTs Ni-Fe oxides 

分 类 号：TQ116.2[化学工程—无机化工] TQ426[一般工业技术—材料科学与工程] TB383.1