| Title | NaBH(4)induces a high ratio of Ni3+/Ni(2+)boosting OER activity of the NiFe LDH electrocatalyst |
| Authors | Wang, Yaqiong Tao, Shi Lin, He Han, Shaobo Zhong, Wenhua Xie, Yangshan Hu, Jue Yang, Shihe |
| Affiliation | Peking Univ, Biotechnol Shenzhen Grad Sch, Sch Chem Biol, Guangdong Key Lab Nanomicro Mat Res, Shenzhen 518055, Peoples R China Hong Kong Univ Sci & Technol, Dept Chem, Kowloon, Clear Water Bay, Hong Kong, Peoples R China Changshu Inst Technol, Jiangsu Lab Adv Funct Mat, Sch Elect & Informat Engn, Changshu 215500, Jiangsu, Peoples R China Southern Univ Sci & Technol, Dept Mat Sci & Engn, Shenzhen 518055, Peoples R China Univ Elect Sci & Technol China, Sch Phys, Chengdu 610054, Peoples R China Kunming Univ Sci & Technol, Fac Sci, Kunming 650093, Yunnan, Peoples R China |
| Keywords | LAYERED DOUBLE HYDROXIDE OXYGEN EVOLUTION REACTION WATER OXIDATION ENERGY-CONVERSION RECENT PROGRESS NICKEL FOAM FE-SITES EFFICIENT CATALYSTS NANOPARTICLES |
| Issue Date | 10-Sep-2020 |
| Publisher | RSC ADVANCES |
| Abstract | Electrochemical water splitting is a promising way to produce hydrogen gas, but the sluggish kinetics of the oxygen evolution reaction (OER) extremely restrict the overall conversion efficiency of water splitting. Transition metal based LDHs (TM LDHs) are one of the most effective non-noble metal OER catalysts and have attracted wide interest, especially the nickel-iron LDH (NiFe LDH). The high valence Ni(3+)species with a large coordination number play a vital role in OER catalysis. Herein, we report on a surprising discovery that reaction between NiFe LDH and NaBH(4)with multi-hydrides induces vacancy formation around Fe(3+)and enrichment in Ni3+, crucially activating the OER performance. The ratio of Ni3+/Ni(2+)is found to be closely tied to the OER performance, nicely accounting for the leading role of Ni(3+)ions in octahedral sites in electrocatalysis. Significantly, the NaBH(4)treated NiFe LDH directly on nickel foam (NF), denoted as NaBH4-NiFe LDH@NF exhibited an outstanding OER performance with an overpotential of only 310 mV at 100 mA cm(-2), and a Tafel slope of 47 mV dec(-1). For the series of TM LDHs we studied with different metal combinations, the high valence metal ion is found to be positively related to OER performance. |
| URI | http://hdl.handle.net/20.500.11897/591815 |
| DOI | 10.1039/d0ra06617f |
| Indexed | SCI(E) |
| Appears in Collections: | 深圳研究生院待认领 |
