Multimetal Borides Nanochains as Efficient Electrocatalysts for Overall Water Splitting. Issue 1 (5th December 2018)

• Record Type: Journal Article
• Authors: Li, Yingjie; Huang, Bolong; Sun, Yingjun; Luo, Mingchuan; Yang, Yong; Qin, Yingnan; Wang, Lei; Li, Chunji; Lv, Fan; Zhang, Weiyu; Guo, Shaojun
• Is Part Of: Small. Volume 15:Issue 1(2019)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2018-12-05
• Subjects: Co‐based multimetal borides -- nanochains -- overall water splitting -- regulable electronic structure; Nanotechnology -- Periodicals; Nanoparticles -- Periodicals; Microtechnology -- Periodicals; 620.5
• DOI: 10.1002/smll.201804212
• Languages: English
• ISSNs: 1613-6810

Abstract

Abstract: The development of cost‐efficient, active, and stable electrode materials as bifunctional catalysts for electrochemical water splitting is crucial to high‐performance renewable energy storage and conversion devices. In this work, the synthesis of Co‐based multi‐metal borides nanochains with amorphous structure is reported for boosting the oxygen evolution (OER) and hydrogen evolution reactions (HER) by one‐pot NaBH4 reduction of Co 2+, Ni 2+, and Fe 2+ under ambient temperature. In all the investigated Co‐based metal borides, NiCoFeB nanochains show the excellent OER performance with a low overpotential of 284 mV at 10 mA cm ‐2 and Tafel slope of 46 mV dec ‐1, respectively, together with excellent catalytic stability, and robust HER performance with an overpotential of 345 mV at 10 mA cm ‐2 . The density functional theory (DFT) calculations reveal that the excellent electrocatalytic performance is mainly attributed to optimal electronic structure by tuning the Co‐3d band activities by the incorporation of Ni and Fe for enhanced water splitting via the potentially existed Co 0 state. Moreover, the electrolyzer using NiCoFeB nanochains as anode and cathode offers 10 mA cm ‐2 at a cell voltage of 1.81 V, comparable to commercial Pt/C // Ir/C, providing a simple method to design and explore highly efficient and cheap bifunctional electrocatalysts for overall water splitting. Abstract : A series of Co‐based multimetal borides with novel nanochain structure are successfully fabricated by a simple one‐pot NaBH4 reduction method. The NiCoFeB exhibits significant electrocatalytic activity for water splitting with 1.81 V cell voltage to obtain current density of 10 mA cm −2 by incorporation of Ni and Fe, which synergistically tune the Co surface state revealed by density functional theory calculations.