Journal
ACS ENERGY LETTERS
Volume 4, Issue 6, Pages 1412-1418Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.9b00867
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Funding
- Natural Science Foundation of China
- Program for Changjiang Scholars and Innovative Research Team in the University
- Ministry of Finance
- Ministry of Education of P. R. China
- Assistant Secretary for Energy Efficiency and Renewable Energy, Vehicle Technology Office of the U.S. Department of Energy through the Advanced Battery Materials Research (BMR) Program
- DOE Office of Science by Brookhaven National Laboratory [DE-SC0012704]
- China Postdoctoral Science Foundation [2018M640694]
- Battery500 Consortium [DE-SC0012704]
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Sustainable water-splitting hydrogen production has long been considered one of the most promising energy conversion technologies, but enormous challenges remain: for instance, water electrolysis suffers from high overpotential and over energy consumption under neutral pH conditions. Here, taking advantage of the memory effect of layered double hydroxide (LDH), we report an energy-efficient neutral water electrolyzer material based on LDH with multiple vacancy defects. Benefiting from the improved electrical conductivity, larger electrochemical surface area (ECSA), and faster charge transfer, the NiFe LDH with O, Ni, and Fe vacancies exhibits a low overpotential of 87 mV at 10 mA/cm(2) for hydrogen evolution reaction (HER) in a pH 7 buffer electrolyte. Impressively, the as-fabricated vacancy-containing NiFe LDH (v-NiFe LDH) splits water with a current density of 10 mA/cm(2) at similar to 1.60 V in a two-electrode device, outperforming most other water-splitting catalysts in neutral media. Such an electrolyzer setup could be powered by a commercial 2.0 V solar cell, producing hydrogen at a current density as high as 100 mA/cm(2).
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