In‐situ Surface‐selective Removal of Al Element from NiFeAl Ternary Nanowires for Large‐current Oxygen Evolution Reaction. Issue 10 (22nd July 2021)

• Record Type: Journal Article
• Authors: Zhang, Xiuhong; Li, Zheng; Shen, Weilin; Zhao, Guang; Yi, Zhaohui; Qi, Ji; Liang, Changhai
• Is Part Of: ChemNanoMat. Volume 7:Issue 10(2021)
• Page Start: 1138
• Page End: 1144
• Publication Date: 2021-07-22
• Subjects: Oxygen evolution reaction -- Large current -- In-situ selective removal -- Ternary catalyst; Nanochemistry -- Periodicals; Nanostructured materials -- Periodicals; Nanochemistry; Nanostructured materials; Periodicals; 541.2
• DOI: 10.1002/cnma.202100194
• Languages: English
• ISSNs: 2199-692X

Abstract

Abstract: To store renewable energy via water splitting, it is crucial to design low‐cost and high‐performance catalysts for oxygen evolution reaction (OER). In this work, a ternary nanowire supported on nickel foam (NiFeAl‐NW/NF) with high specific surface area and catalytic activity was prepared by hydrothermal method and in‐situ selective surface removal. High OER current densities of 100, 500 and 1000 mA ⋅ cm −2 were achieved under anode potentials of 1.52, 1.56 and 1.60 V vs. RHE, respectively. The NiFeAl‐NW/NF was stable under 1 A cm −2 OER current density in the 40 hour durability test. In situ surface selective removal of aluminum from nanowires provides abundant structural defects, which effectively enlarge the electrochemically surface area of the integral catalyst suitable for large‐current oxygen evolution reaction (OER). Abstract : A new strategy was used to prepare NiFeAl nanowires on foam nickel and to remove aluminum in situ. It shows high activity and stability, which is due to the structural defects left after the removal of aluminum. Moreover, the introduction of aluminum can reduce the size of nanoparticles and increase the specific surface area.