Wang Mengmeng, Chen Dongyun, Li Najun, Xu Qingfeng, Li Hua, He Jinghui, Lu Jianmei
Collaborative Innovation Center of Suzhou Nano Science and Technology, College of Chemistry Chemical Engineering and Materials Science Soochow University, 199 Ren'ai Road, Suzhou, 215123, P.R. China.
Adv Mater. 2022 Jul;34(28):e2202960. doi: 10.1002/adma.202202960. Epub 2022 Jun 6.
Photocatalytic CO reduction can be implemented to use CO , a greenhouse gas, as a resource in an energy-saving and environmentally friendly way, in which suitable catalytic materials are required to achieve high-efficiency catalysis. Insufficient accessible active sites on the catalyst surface and inhibited electron transfer severely limit the photocatalytic performance. Therefore, porous aerogels are constructed from composites comprising different ratios of Ni-Co bimetallic hydroxide (Ni Co ) grown on reduced graphene oxide (GR) into a hierarchical nanosheet-array structure using a facile in situ growth method. Detailed characterization shows that this structure exposes numerous active sites for enhanced adsorption-induced photocatalytic CO reduction. Moreover, under the synergistic effect of Ni-Co bimetallic hydroxide, the CO adsorption capacity as well as charge-carrier separation and transfer are excellent. As a result, the Ni Co -GR catalyst exhibits highly improved catalytic performance when compared with recently reported values, with a high CO release rate of 941.5 µmol h g and a selectivity of 96.3% during the photocatalytic reduction of CO . This work demonstrates a new strategy for designing nanocomposites with abundant active sites structures.
光催化一氧化碳还原可以将温室气体一氧化碳作为一种资源，以节能和环保的方式加以利用，其中需要合适的催化材料来实现高效催化。催化剂表面可及的活性位点不足以及电子转移受阻严重限制了光催化性能。因此，采用简便的原位生长方法，由不同比例的生长在还原氧化石墨烯（GR）上的镍-钴双金属氢氧化物（NiCo）组成的复合材料构建成多孔气凝胶，形成分级纳米片阵列结构。详细表征表明，这种结构暴露了大量活性位点，可增强吸附诱导的光催化一氧化碳还原。此外，在镍-钴双金属氢氧化物的协同作用下，一氧化碳吸附能力以及电荷载流子的分离和转移都很出色。结果，与最近报道的值相比，NiCo-GR催化剂表现出高度改善的催化性能，在光催化还原一氧化碳过程中，一氧化碳释放速率高达941.5 μmol h g，选择性为96.3%。这项工作展示了一种设计具有丰富活性位点结构的纳米复合材料的新策略。
