Uniform NiFe phosphide nanosheets arrays on carbon cloth as high-performance oxygen evolution catalysts. (March 2019)

• Record Type: Journal Article
• Authors: Teng, Changqing; Zhang, Ning; Gao, Xuehui; Li, Xiaoyu; Wu, Zongxiao; Wang, Wencong; Zhi, Mingjia; Hong, Zhanglian
• Is Part Of: Materials today energy. Volume 11(2019)
• Page Start: 192
• Page End: 198
• Publication Date: 2019-03
• Subjects: NiFe -- Phosphide -- OER -- Arrays -- Catalyst; Energy development -- Periodicals; Energy industries -- Periodicals; Power resources -- Periodicals; Energy policy -- Periodicals; Energy development; Energy industries; Energy policy; Power resources; Electronic journals; Periodicals; 621.042
• DOI: 10.1016/j.mtener.2018.11.008
• Languages: English
• ISSNs: 2468-6069

Abstract

Abstract: It is vital to develop oxygen evolution reaction catalyst with rational designed composition and microstructure to facilitate the overall electrochemical water splitting. In this work, uniform Nix Fe1-x -P nanosheets arrays are vertically grown on carbon cloth to form an effective oxygen evolution reaction catalyst. Such structure is prepared by phosphorization of the corresponding layered double hydroxide nanosheets. In this synthesis, the hydroxides are converted to phosphide while the porous nature is well retained. The ratio of Ni to Fe in the phosphide is tuned and the optimized synergistic effect between Ni and Fe for oxygen evolution reaction catalytic activity is achieved. The nanoarrays with hierarchical porous structure offer more reaction sites and promote the charge transfer. As a result, low reaction overpotential and small Tafel slope have been realized. In additional, the synthesis strategy can be also applied to prepare Ni5 P4 hydrogen evolution reaction catalyst. A full water electrolyzer is demonstrated with the optimized cathode and anode, and remarkable overall water splitting activity is obtained with a current density of 10 mA cm −2 at the potential of 1.53 V. Highlights: Uniform Nix Fe1-x -P nanosheets arrays is synthesized by microwave hydrothermal and subsequently phosphorization. The synergistic effect between Ni and Fe activity is optimized for OER catalytic. An OER performance is achieved with a low overpotential of 204 mV at 10 mA cm − 2 and small Tafel slopes of 41.2 mV dec −1 . The water electrolyzer is assembled and shows a nice overall water splitting activity to achieve 10 mA cm −2 at the potential of 1.53 V.