Biomimetic Hybridization of Janus-like Graphene Oxide into Hierarchical Porous Hydrogels for Improved Mechanical Properties and Efficient Solar Desalination Devices
Biomimetic Hybridization of Janus-like Graphene Oxide into Hierarchical Porous Hydrogels for Improved Mechanical Properties and Efficient Solar Desalination Devices
复制标题
将类 Janus 氧化石墨烯仿生杂交成分级多孔水凝胶，以改善机械性能和高效太阳能海水淡化装置
DOI：
10.1021/acsnano.1c07391
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发表时间：
2021-12-08
期刊：
影响因子：
17.1
通讯作者：
Zhang, Jianming
中科院分区：
文献类型：
--
作者：
Ma, Cheng;Liu, Qiaoling;Zhang, Jianming
光吸收水凝胶提供了一种利用太阳能快速蒸发水的方法。然而，由于太阳能吸收器和水凝胶基质之间的弱界面相互作用以及膨胀的水凝胶蒸发器的表面形貌难以控制，获得既具有持久的机械性能又具有高效的能量利用的吸光水凝胶仍然具有挑战性。在这里，我们展示了一种有效的纳米限制策略，通过氢键和疏水作用的强界面相互作用来组装海绵状聚乙烯醇/Janus状氧化石墨烯杂化水凝胶(SPJH)。以气泡和冰晶为模板的SPJHs具有有趣的层次化微结构，表现出高韧性(类似于231kJ m(-2))和极限应变(类似于310%)，是光吸收水凝胶的三倍多，在1次太阳照射(相对湿度=20%；温度=25℃)下的高蒸发速率为4.18 kg m(-2)h(-1)，通过协同机械和能量纳米约束以及在所设计的混合水凝胶中定制的表面形貌实现了效率高达95%。这种基于混合水凝胶的太阳能蒸发器具有巧妙的设计原理，为可扩展和可加工的太阳能净水设备提供了一条途径。
Light-absorbing hydrogels provide a means for rapidly evaporating water by using solar energy. However, to achieve light-absorbing hydrogels with both durable mechanical properties and efficient energy utilization remains challenging due to the weak interface interactions between solar absorbers and a hydrogel matrix and difficultly controlled surface topography of swollen hydrogel-based evaporators. Herein, we demonstrate an effective nanoconfinement strategy to assemble a spongy poly(vinyl alcohol)/Janus-like graphene oxide hybrid hydrogel (SPJH) via strong interfacial interactions of hydrogen bonding and hydrophobic interaction. The resultant SPJHs with an intriguing hierarchical microstructure templated by air bubbles and ice crystals showed a high toughness (similar to 231 kJ m(-2)) and ultimate strain (similar to 310%) that were more than three times as high as those of light-absorbing hydrogels and a high evaporation rate of 4.18 kg m(-2) h(-1) with an efficiency up to 95% under 1 sun irradiation (relative humidity = 20%; temperature = 25 degrees C), achieved by synergistic mechanical and energy nanoconfinement and tailored surface topography within the designed hybrid hydrogels. This hybrid hydrogel-based solar evaporator with an ingenious design principle provides a pathway for scalable and processable solar water purification devices.