As a clean, efficient and sustainable energy source, hydrogen energy is highly regarded by countries all over the world because of its high-quality energy density, pollution-free combustion products, and high utilization rate. It is hailed as the most ideal new energy in the 21st century. Hydrogen production from electrolyzed water is an important hydrogen production technology, but in the actual hydrogen production process, the efficiency of hydrogen production is low. Therefore, scientists have been committed to developing high-performance electrolyzed water catalysts with a view to achieving efficient hydrogen production.
The Energy Materials and Nanocatalysis Research Group led by Liang Hanpu, a researcher at the Qingdao Institute of Bioenergy and Processes, Chinese Academy of Sciences, is committed to exploring the synthesis of high-performance nanocatalysts for use in related fields. Recently, a series of progress has been made in the field of electrochemical hydrogen production:
1) Developed a novel "rapid reduction-in-situ phase transition" strategy, successfully prepared nano-scale ultra-thin cobalt-iron (CoFe) bimetallic hydroxyl groups with rich active sites on commercial carbon (VulcanXC-72) carrier Oxide. This study provides a new strategy for the preparation of uniformly dispersed multi-metal electrocatalysts under mild conditions (ACS Applied Materials & Interfaces. 2019; 11 (29): 25958-25966).
2) The mesoporous ultrathin cobalt oxide (CoOx) nanosheets were successfully grown on carbon paper, and the carbon paper grown with cobalt oxide nanosheets was directly used as the working electrode to study its electrocatalytic oxygen evolution performance. This research provides a new idea for large-scale preparation of working electrode with high activity for oxygen evolution reaction (ACS Applied Energy Materials. 2019; 2 (3): 1977-1987).
3) A simple and low-cost electro-oxidation method was used to successfully synthesize 3D porous iron-cobalt (FeCo) bimetallic oxyhydroxide (3D-FeCoOOH / CC) as a high-efficiency electrode for electrocatalytic oxygen evolution reaction. The Tafel slope of mV dec-1 is superior to commercial iridium oxide (IrO2) catalysts (Chin J Catal. 2019; 40: 1540-1547).
4) Using Co (cobalt) metal nanoparticles as a sacrificial template, hollow rhodium (Rh) nanospheres were successfully prepared. Compared with the rhodium-based catalysts reported in the literature and commercial rhodium carbon (Rh / C) catalysts, the The catalytic hydrogen evolution process shows good catalytic performance (Electrochimica Acta. 2018; 282: 853-859).
5) CoEGAc (cobalt organic complex) nanodisks with smooth surface are used as electrocatalyst for oxygen evolution reaction. After electrochemical oxidation for a certain period of time, CoEGAc nanodisks produce pure phase porous cobalt oxyhydroxide (CoOOH) nanodisks, and Shows excellent electrocatalytic oxygen evolution performance. This experiment provides direct experimental evidence that CoOOH is a stable active crystalline phase of the cobalt-based catalyst during the oxygen evolution reaction under alkaline conditions (Electrochimica Acta. 2019; 303: 231-238).
The above research was supported by the Hundred Talents Program of the Chinese Academy of Sciences, the Research and Innovation Fund of the Qingdao Energy Research Institute, and the Two Fusion Funds.
(Ad) TEM image and (fi) element distribution map of synthetic CoFe alkoxide precursor
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