利用双滴法合成了厚度仅为1.86nm的超薄CoFeAl水滑石纳米片(CoFeAl-LDH),发现其具有优异的光催化产氢性能。利用X射线衍射仪、透射电子显微镜、原子力显微镜和紫外-可见吸收光谱等多种表征方法,研究了其晶体结构、形貌和能带结构。实验结果表明,CoFeAl-LDH在400～800nm的可见光区域内均具有较好的光吸收能力,而且通过调变Co∶Fe∶Al的摩尔比例,实现了CoFeAl-LDH的能带调控。系统考查了不同Co∶Fe∶Al摩尔比例对其光催化产氢性能的影响,发现Co6Fe3Al3-LDH催化剂展现出最好的产氢活性,产氢速率达到576μmol/g·h,高产氢活性主要是由于其具备更强的还原氢质子能力,以及更优的光生载流子分离效率。
Ultrathin CoFeAl-LDH nanosheets with a thickness of 1.86nm were successfully prepared by a co-precipitation method.The as-obtained ultrathin CoFeAl-LDH nanosheets showed excellent photocatalytic H2-production performance.The crystal structures,morphologies and energy band gap structures were studied through various characterization methods,including X-ray diffraction instrument,transmission electron microscope and UV-Vis absorption spectra.The experimental results showed that all CoFeAl-LDH nanosheets with different Co∶Fe∶Al molar ratios exhibited excellent visible light absorption ability in the range of 400～800nm.Moreover,the energy band gap could be tuned by changing the Co∶Fe∶Al molar ratio.The effects of various Co∶Fe∶Al molar ratios on the photocatalytic hydrogen production performance of CoFeAl-LDHs were systematically investigated,revealing that the catalyst Co6Fe3Al3-LDH exhibited the highest photocatalytic activity,with a H2 production rate of 576μmol·g-1·h-1.The high photocatalytic hydrogen production activity of Co6Fe3Al3-LDH was mainly attributed to its stronger ability for proton reduction and better photogenerated charge transfer separation efficiency.
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基金资助
国网浙江省电力有限公司科技项目(B311JZ20001)
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