Dual-coupling ultrasmall iron-Ni2P into P-doped porous carbon sheets assembled CuxS nanobrush arrays for overall water splitting. (June 2021)

• Record Type: Journal Article
• Authors: Tran, Duy Thanh; Le, Huu Tuan; Hoa, Van Hien; Kim, Nam Hoon; Lee, Joong Hee
• Is Part Of: Nano energy. Volume 84(2021)
• Publication Date: 2021-06
• Subjects: Iron-nickel phosphide dual-coupling -- Phosphorous-doped carbon -- Bifunctional catalyst -- Electrochemical water splitting; Nanoscience -- Periodicals; Nanotechnology -- Periodicals; Nanostructured materials -- Periodicals; Power resources -- Technological innovations -- Periodicals; Nanoscience; Nanostructured materials; Nanotechnology; Power resources -- Technological innovations; Periodicals; 621.042
• DOI: 10.1016/j.nanoen.2021.105861
• Languages: English
• ISSNs: 2211-2855

Abstract

Abstract: The challenge of simultaneously boosting two half-reactions for overall water splitting using a catalyst with excellent activity, good durability, and cost-effectiveness is still attracting great interest from the scientific community. Herein, a novel electrocatalyst was fabricated via a facile synthesis strategy for both the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). The electrocatalyst was designed by dual-coupling iron and Ni2 P into P-doped porous carbon (PC) sheets, which were uniformly shelled over one-dimensional copper sulfide (Cux S) arrays to form a unique nanobrush architecture. The synergistic effects between the iron and ultrasmall Ni2 P nanoparticles offered a dominant contribution to the catalytic activities with a low required overpotential of 112.9 mV to reach 10 mA cm −2 for the HER and 330 mV to reach 50 mA cm −2 for the OER, superior to bare Cux S and Ni2 P@PC/Cux S. An electrolyzer cell originated from Fe-Ni2 P@PC/Cux S electrodes required a small cell voltage of 1.62 V at a current response of 10 mA cm −2, which even interestingly surpassed recently reported ones. The excellent performance of the proposed Fe–Ni2 P@PC/Cux S material made it an innovative bifunctional candidate for overall water splitting applications. Graphical Abstract: ga1 Highlights: Fe-Ni2 P dual-coupled P-doped carbon nanosheets supported Cux S arrays is prepared. The hybrid catalyst exhibits good activities toward both HER and OER in 1.0 M KOH. The hybrid-based electrolyzer delivers a cell voltage of 1.62 V at 10 mA cm −2 . The hybrid-based electrolyzer achieves good stability and durability in 1.0 M KOH.