Science and technology
Qingdao Energy Institute developed a series of electrochemical hydrogen production nanoelectrocatalysts
As a clean, efficient and sustainable energy source, hydrogen energy has been highly valued by countries all over the world due to its high energy density, pollution-free combustion products and high utilization rate. It is regarded as the most ideal new energy source in the 21st century. Hydrogen production from electrolyzed water is an important hydrogen production technology, but in the actual hydrogen production process, hydrogen production efficiency is low. Therefore, scientists have been committed to the development of high-performance electrolyzed water catalysts in order to achieve efficient hydrogen production.
The Energy Materials and Nanocatalysis Research Group led by Liang Hanjun, a researcher at the Qingdao Institute of Bioenergy and Processes at the Chinese Academy of Sciences, is dedicated 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 to successfully prepare nanoscale ultrathin cobalt iron (CoFe) bimetallic hydroxyl groups with abundant active sites on commercial carbon (VulcanXC-72) carrier. Oxide. This study provides a completely new strategy for the preparation of uniformly dispersed polymetallic 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 of the cobalt oxide nanosheets was directly used as the working electrode. The electrocatalytic oxygen evolution performance was studied. This study provides a new idea for the large-scale preparation of highly active oxygen evolution reaction working electrodes (ACS Applied Energy Materials. 2019; 2(3): 1977-1987).
3) The 3D porous iron-cobalt (FeCo) double metal oxyhydroxide (3D-FeCoOOH/CC) was successfully synthesized by a simple and low-cost electrooxidation method as a high-efficiency electrode for electrocatalytic oxygen evolution, with an oxygen evolution reaction of 34.9. The Tafel slope of mV dec-1 is superior to the commercial cerium oxide (IrO2) catalyst (Chin J Catal. 2019; 40: 1540-1547).
4) The hollow rhodium (Rh) nanospheres were successfully prepared using Co(cobalt) metal nanoparticles as a sacrificial template, compared with the rhodium-based catalysts reported in the literature and the commercial rhodium (Rh/C) catalysts. Catalytic hydrogen evolution shows good catalytic performance (Electrochimica Acta. 2018; 282: 853-859).
5) The synthesized surface of CoEGAc (cobalt organic complex) nanodisk is used as an oxygen evolution reaction electrocatalyst. After electrochemical oxidation for a certain time, the CoEGAc nanodisk generates pure phase porous cobalt oxyhydroxide (CoOOH) nanodisk. It exhibits excellent electrocatalytic oxygen evolution properties. This experiment provides direct experimental evidence that CoOOH is a stable active crystalline phase of a cobalt-based catalyst during oxygen evolution under alkaline conditions (Electrochimica Acta. 2019; 303: 231-238).
The above research was supported by the Chinese Academy of Sciences Hundred Talents Program, Qingdao Energy Research and Innovation Fund, and two integration funds.
1. A method for preparing a single-layer porous cobalt oxyhydroxide nanosheet by electrochemical oxidation method (application No.: 201810321648.7)
2. A method for preparing a single-layer porous tricobalt tetroxide nanosheet (Application No.: 201810864976.1)