@article{Kim2022, 
author = {Min Sung Kim and Duy Thanh Tran and Thanh Hai Nguyen and Van An Dinh and Nam Hoon Kim and Joong Hee Lee},
title = {Ni Single Atoms and Ni Phosphate Clusters Synergistically Triggered Surface-Functionalized MoS2 Nanosheets for High-performance Freshwater and Seawater Electrolysis},
year = {2022},
journal = {Energy & Environmental Materials},
volume = {5},
number = {4},
pages = {1340-1349},
keywords = {bifunctional electrocatalyst, freshwater and seawater electrolysis, nickel phosphate clusters, nickel single atoms, surface-functionalized- MoS2 nanosheets},
url = {https://www.sciopen.com/article/10.1002/eem2.12366},
doi = {10.1002/eem2.12366},
abstract = {Two-dimensional metal dichalcogenides have been evidenced as potential electrocatalysts for hydrogen evolution reaction (HER); however, their application is limited by a poor oxygen evolution reaction (OER) activity due to insufficient number/types of multi-integrated active sites. In this study, we report a novel bifunctional catalyst developed by simultaneous engineering of single nickel atoms (NiSA) and nickel phosphate clusters (NiPi) to synergistically trigger surface-functionalized MoS2 nanosheets (NSs) resulting in high reactivities for both HER and OER. The NiSA-NiPi/MoS2 NSs material exhibits a fairly Pt-like HER behavior with an overpotential of 94.0 mV and a small OER overpotential of 314.0 mV to reach 10 mA cm−2 in freshwater containing 1.0 M KOH. Experimental results of the catalyst are well supported by theoretical study, which reveals the significant modulation of electronic structure and enrichment of electroactive site number/types with their reasonably adjusted free adsorption energy. For evaluating practicability, the NiSA-NiPi/MoS2 NSs-based electrolyzer delivers effective operation voltage of 1.62, 1.52, and 1.66 V at 10 mA cm−2 and superior long-term stability as compared to Pt/C//RuO2 system in freshwater, mimic seawater, and natural seawater, respectively. The present study indicates that the catalyst is a promising candidate for the practical production of green hydrogen via water electrolysis.}
}