Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 625, Issue -, Pages 50-58Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2022.05.162
Keywords
Industrial electrocatalytic water splitting; High current density; Ion bath microenvironment; Phase transformation; Ultra-thin porous nanosheets
Categories
Funding
- Qingdao Innovation Leading Talent Program, National Natural Science Foundation of China [21805124]
- Natural Science Foundation of Shandong Province [ZR2018BEM020]
Ask authors/readers for more resources
This study successfully achieved phase transformation from carbonate hydroxide hydrate nanosheets to nickel ferrite intercalated ultra-thin porous nanosheets by controlling the escape of nickel atoms. The prepared NF-CH-O nanosheets exhibit remarkable oxygen and hydrogen evolution reaction catalytic activity and stability, making them suitable for industrial electrocatalytic water splitting applications.
Precisely tailoring the structure of inorganic materials at the micron and nanometer scales, especially in collaboration with component customization to design efficient, stable and low-cost transition-metal-based catalysts for industrial electrocatalytic water splitting (EWS) is a key renewable energy technology, but still facing a daunting challenge. Here, the controllable escape of Ni atom is adopted to disturb the hydrothermal ion-bath environment, thereby resulting in the coexistence of high valence Ni and Fe ions. Combined with a one-step hydrothermal coordination strategy, the timeline-adjusted ion-bath microenvironment can effectively trigger the phase transformation of carbonate hydroxide hydrate nanosheets (NFCH) to nickel ferrite intercalated NFCH ultra-thin porous nanosheets (NF-CH-O). Thanks to the high-energy phase boundary synergistic effect and the rapid mass transfer advantages of ultra-thin porous nanostructures, the as-prepared NF-CH-O nanosheets exhibit remarkable oxygen and hydrogen evolution reaction (OER/HER) catalytic activity and stability, with low overpotentials of 207/191 mV at 50 mA cmz, respectively, as well as the activity retention for 100 h. The alkaline water electrolyzer set up with NF-CH-O as both anodic and cathodic electrodes only requires a cell potential of 1.688 V to reach 50 mA cm(-2) in a continuous operation of 100 h. More impressively, NF-CH-O only requires overpotentials of 266, 292 mV and 1.877 V to drive high current densities up to 500 mA cm(-2) for OER, HER and EWS, respectively, and exhibits excellent stability with a reduction in the activity of less than 10% over cycles of more than 65 h. This work highlights the room-temperature controllable ion-bath oxidative etching strategy to design efficient bifunctional catalysts with ultra-thin porous structure and high-current-density activity. Meanwhile, combined with the advantages of direct growth on the substrate for mass production, such meticulous consideration of nanostructured design will be more competitive in the H-2-production industry. (C) 2022 Elsevier Inc. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available