Department of Materials Science and Engineering, Northwestern University, Evanston, IL, 60208, USA.
Department of Chemistry, National Sun Yat-sen University, Kaohsiung, 80424, Taiwan.
Nat Commun. 2019 Jan 24;10(1):422. doi: 10.1038/s41467-019-08389-6.
Graphene oxide (GO) sheets have been used to construct various bulk forms of GO and graphene-based materials through solution-based processing techniques. Here, we report a highly cohesive dough state of GO with tens of weight percent loading in water without binder-like additives. The dough state can be diluted to obtain gels or dispersions, and dried to yield hard solids. It can be kneaded without leaving stains, readily reshaped, connected, and further processed to make bulk GO and graphene materials of arbitrary form factors and tunable microstructures. The doughs can be transformed to dense glassy solids of GO or graphene without long-range stacking order of the sheets, which exhibit isotropic and much enhanced mechanical properties due to hindered sliding between the sheets. GO dough is also found to be a good support material for electrocatalysts as it helps to form compliant interface to access the active particles.
氧化石墨烯（GO）片已被用于通过基于溶液的加工技术构建各种块状的 GO 和基于石墨烯的材料。在这里，我们报告了一种具有数十重量百分比负载的 GO 的高内聚面团状态，而无需使用类似粘结剂的添加剂。该面团状态可被稀释以获得凝胶或分散体，并干燥以获得坚硬的固体。它可以被揉捏而不会留下污渍，容易重塑、连接和进一步加工，以获得具有任意形状因子和可调节微结构的块状 GO 和石墨烯材料。面团可以转化为没有片层长程堆积有序的 GO 或石墨烯致密玻璃状固体，由于片层之间的滑动受到阻碍，其表现出各向同性和大大增强的机械性能。GO 面团也被发现是电催化剂的良好支撑材料，因为它有助于形成顺应性界面以接触活性颗粒。
