Cu2O-Cu2Se Mixed-Phase Nanoflake Arrays: pH-Universal Hydrogen Evolution Reactions with Ultralow Overpotential

Title
Cu2O-Cu2Se Mixed-Phase Nanoflake Arrays: pH-Universal Hydrogen Evolution Reactions with Ultralow Overpotential
Authors
정경윤이수찬Chaiti RayBingjun JinShiyin GuoShengli ZhangKan Zhang박종혁전상찬
Keywords
Cu2O-Cu2Se; electrocatalysis; ultrathin nanostructures; hydrogen evolution reaction; pH universality
Issue Date
2019-10
Publisher
ChemElectroChem
Citation
VOL 6, NO 19-5021
Abstract
Most developed hydrogen evolution reaction (HER) electrocatalysts have pH‐ dependent functionalities, which limit their universal applications. Pt, the ideal HER electrocatalyst, is also highly effective in specific pH conditions. In the present article, we report a copper‐ based transition‐ metal chalcogenide from anion engineering. Hierarchical three‐ dimensional (3D) Cu2O− Cu2Se nanoflake arrays (COCS NFs) are grown directly on nickel foam (NF) by combining the rapid electrodeposition technique with the room temperature wet‐ chemical selenization method. Via the synergetic effects of the proper ratio of Se and O, as‐ synthesized COCS NFs manage to accomplish key‐ requirements for pH‐ universal HER performances with overpotential values of 52.9, 62.8, and 77.8  mV, in alkaline, neutral, and acidic media, respectively, at 10  mA  cm− 2. The electrocatalyst also possesses superb stability at constant 10  2 current density for 50  h in all electrolytes. This work offers a synthesis protocol of a mixed‐ anion composite with the revelation about the importance of anion modulation towards electrode surface properties and HER performances.
URI
http://pubs.kist.re.kr/handle/201004/69987
ISSN
2196-0216
Appears in Collections:
KIST Publication > Article
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