10.1021/acssuschemeng.8b05770.s001 Zuozhong Liang Zuozhong Liang Chaochao Zhang Chaochao Zhang Yang Xu Yang Xu Wei Zhang Wei Zhang Haoquan Zheng Haoquan Zheng Rui Cao Rui Cao Dual Tuning of Ultrathin α‑Co(OH)<sub>2</sub> Nanosheets by Solvent Engineering and Coordination Competition for Efficient Oxygen Evolution American Chemical Society 2018 Co salt 2- methylimidazole methanolic solution energy conversion Efficient Oxygen Evolution Large-scale preparation Solvent Engineering Coordination Competition α- ultrathin thickness strategy 2 D Co-based ultrathin 2 D Co-based nanosheets 267 mV oxygen evolution reaction performance 2 D hydroxide nanosheets Dual Tuning preparation method coordination competition room temperature 2018-12-26 00:00:00 Journal contribution https://acs.figshare.com/articles/journal_contribution/Dual_Tuning_of_Ultrathin_Co_OH_sub_2_sub_Nanosheets_by_Solvent_Engineering_and_Coordination_Competition_for_Efficient_Oxygen_Evolution/7599773 Large-scale preparation of ultrathin 2D Co-based nanosheets is of great importance in the fields of catalysis, energy conversion, etc. Herein, we have developed a simple preparation method of 2D ultrathin α-Co­(OH)<sub>2</sub> nanosheets by mixing an aqueous solution of Co salt and a methanolic solution of 2-methylimidazole at room temperature. The resulting α-Co­(OH)<sub>2</sub> materials are nanosheets with an average thickness of ∼2.5 nm and the size in micrometers. Benefiting from the ultrathin thickness, this α-Co­(OH)<sub>2</sub> nanosheet exhibits excellent oxygen evolution reaction performance with an overpotential of 267 mV at <i>j</i> = 10 mA cm<sup>–2</sup>. This strategy can be applied to prepare other 2D Co-based layered double or triple hydroxides. Therefore, this work provides new strategies to prepare a series of 2D hydroxide nanosheets with solvent engineering and coordination competition.