@article{Wang2022, 
author = {Yandong Wang and Wei Wu and Runzhe Chen and Caoxin Lin and Shichun Mu and Niancai Cheng},
title = {Reduced water dissociation barrier on constructing Pt-Co/CoOx interface for alkaline hydrogen evolution},
year = {2022},
journal = {Nano Research},
volume = {15},
number = {6},
pages = {4958-4964},
keywords = {water dissociation, interfacial construction, amorphous cobalt oxide, dual active site, electronic regulation},
url = {https://www.sciopen.com/article/10.1007/s12274-022-4128-6},
doi = {10.1007/s12274-022-4128-6},
abstract = {Water dissociation process is generally regarded as the rate-limiting step for alkaline hydrogen evolution reaction (HER), and severely inhibits the catalytic efficiency of Pt based catalysts. To overcome this problem, the in-situ constructed interfaces of Pt-Co alloy and amorphous cobalt oxide (CoOx) on the carbon powder are designed. The amorphous CoOx at Pt-Co/CoOx interfaces not only provide active sites for water dissociation to facilitate Volmer step, but also produce the strong electronic transfer with Pt-Co. Accordingly, the obtained interfacial catalysts exhibit outstanding alkaline HER performance with a Tafel slope of 29.3 mV·dec−1 and an ultralow overpotential of only 28 mV at 10 mA·cm−2. Density functional theory (DFT) reveals that the electronic accumulation on the interfacial Co atom in Pt-Co/CoOx constructing the novel active site for water dissociation. Compared to the Pt-Co, all of the energy barriers for water adsorption, water dissociation and hydrogen adsorption/desorption are reduced in Pt-Co/CoOx interfaces, suggesting a boosted HER kinetics for alkaline HER.}
}