Angewandte Chemie - International Edition
Angewandte Chemie - International Edition
4 years ago

Three-Dimensional Graphene Networks with Abundant Sharp Edge Sites for Efficient Electrocatalytic Hydrogen Evolution

Lei Gao, Le Cai, Li-Zhu Wu, Chen-Ho Tung, Xu-Bing Li, Tian-Bao Ma, Huping Wang, Jie Yang, Hao-Lin Wu, Gui Yu
To achieve sustainable production of hydrogen (H2) through water splitting, establishing efficient and earth-abundant electrocatalysts is of great necessity. Here, we firstly reveal that morphology engineering of graphene can modulate the electronic structure of carbon skeleton and in turn endow it with excellent ability of proton reduction. Three-dimensional (3D) graphene networks with the high density of sharp edge sites are synthesized. Electrocatalytic measurements indicate that the obtained 3D graphene networks can electrocatalyze H2 evolution with an extremely low onset potential of ~18 mV in 0.5 M H2SO4 solution, together with good stability. A combination of control experiments and density functional theory (DFT) investigations indicates that the exceptional H2 evolution performance is attributed to the abundant sharp-edge sites of the advanced frameworks, which are responsible for promoting the adsorption and reduction of protons.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/anie.201709901

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