Efficient hematite photoanodes prepared by hydrochloric acid-treated solutions with amphiphilic graft copolymer
Efficient hematite photoanodes prepared by hydrochloric acid-treated solutions with amphiphilic graft copolymer
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DOI：
10.1016/j.jpowsour.2018.10.007
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发表时间：
2018-11
影响因子：
9.2
通讯作者：
M. Park;D. Walsh;Jifang Zhang;Jong Hak Kim;Salvador Eslava
中科院分区：
文献类型：
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作者：
M. Park;D. Walsh;Jifang Zhang;Jong Hak Kim;Salvador Eslava
制备光电极的简单和低成本方法对于实现向可持续和循环经济的过渡至关重要，在这种经济中，太阳光能得到有效利用和利用。本文介绍了一种新的、简单的制备溶胶溶液的方法，该溶液可以用旋涂沉积的方法浇铸成介孔α-Fe2O3赤铁矿水解式光阳极，在1个太阳光照射下可达到1.05vRHe mA cm−2at 1.23VRHE.以廉价的商品∼10 nmα-Fe2O3赤铁矿纳米粒子为赤铁矿薄膜前驱体，以两亲聚氯乙烯-接枝聚甲基丙烯酸接枝共聚物(PVCg-PON)为孔模板，以盐酸为氧化铁相导向剂制备了溶胶溶液。亲水的POEM侧链选择性地与经盐酸处理的赤铁矿纳米颗粒相互作用，从而使其分散。此外，溶胶液中的HCl分散和溶解了赤铁矿纳米颗粒，这些纳米颗粒以混合相γ-FeOOH和β-FeOOH的形式重新析出，由于纳米结构更精细，赤铁矿(110)面更明显，表面更羟化，从而获得了性能更好的赤铁矿薄膜。这项工作表明，利用两亲性接枝共聚物、赤铁矿纳米颗粒和盐酸之间的协同作用，可以在廉价的旋涂技术中制备出坚固、稳定和有前景的能源器件用赤铁矿光阳极。
Simple and low-cost approaches for the preparation of photoelectrodes are crucial to enable a transition towards a sustainable and circular economy in which sunlight energy is efficiently harnessed and used. Here, a novel and simple process is presented to prepare a sol solution that can be cast by spin coating deposition for mesoporousα-Fe2O3hematite water-splitting photoanodes, reaching 1.05 mA cm−2at 1.23 VRHEunder 1 sun illumination. The sol solution is prepared using inexpensive commercial ∼10 nmα-Fe2O3hematite nanoparticles as hematite film precursor, an amphiphilic poly(vinyl chloride)-graft-poly(oxyethylene methacrylate) (PVC-g-POEM) graft copolymer as a pore template, and HCl acid as an iron oxide phase directing agent. The hydrophilic POEM side chains selectively interact with HCl-treated hematite nanoparticles allowing their dispersion. Moreover, the HCl in the sol solution disperses and dissolves the hematite nanoparticles which re-precipitate as mixed phaseγ-FeOOH andβ-FeOOH, leading to better performant hematite films due to finer nanostructures, a more pronounced hematite (110) plane, and a more hydroxylated surface. This work demonstrates that synergies between an amphiphilic graft copolymer, hematite nanoparticles and HCl acid can be exploited in the inexpensive spin coating technique to prepare robust, stable and promising hematite photoanodes for energy devices.