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\bibitem{Xi_etal2021} {\textquotedblleft}\textit{Highly active, selective, and stable Pd single-atom catalyst anchored on N-doped hollow carbon sphere for electrochemical H$_{2}$O$_{2}$ synthesis under acidic conditions}{\textquotedblright}. Xi J, Yang S, Silvioli L, Cao S, Liu P, Chen Q, Zhao Y, Sun H, Hansen JN, Haraldsted J-PB, Kibsgaard J, Rossmeisl J, Bals S, Wang S, Chorkendorff I, Journal Of Catalysis \textbf{393}, 313 (2021).   http://doi.org/10.1016/J.JCAT.2020.11.020

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