Highly Efficient Hydrogen and Electricity Production Combined with Degradation of Organics Based on a Novel Solar Water-Energy Nexus System
Highly Efficient Hydrogen and Electricity Production Combined with Degradation of Organics Based on a Novel Solar Water-Energy Nexus System
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基于新型太阳能水能连接系统的高效制氢和有机物降解相结合
DOI：
10.1021/acsami.9b18989
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发表时间：
2020
影响因子：
9.5
通讯作者：
Qingyi Zeng
中科院分区：
文献类型：
--
作者：
Sheng Chang;Chun Hu;Ahmad Beyhaqi;Mingqi Wang;Qingyi Zeng
提出了一种新型的无辅助太阳能水能联结系统(SWENS)，该系统由一个整体式光阳极(通过在高活性透明掺锑纳米棒阵列(Sb/TNR)的反面连接一个硅电池(SC)组装而成)和一个铂黑/铂阴极组成，用于水处理过程中的有效发电和制氢。采用简单的水热法在掺氟SnO2衬底上制备了垂直排列的纳米棒结构的Sb/TnR，由于Sb掺杂提高了Sb/TnR的电荷转移特性和电荷-载流子密度，使其光电流密度∼达到1.77 mA cm-2(0.6V vs Ag/AgCl2)，是未掺杂样品的∼181%。在AM 1.5的光照下运行4h，对2-氯苯酚的脱除效率接近100%，平均产氢速率为31.4μmolh-1 cm-2，开路电压为∼2.16V，短路电流为∼1857μA cm-2，最大功率输出为∼967μW cm-2，是报道的最先进光催化燃料电池功率密度的∼10.8倍。这种出色的性能归功于整体式光阳极的协同效应，其中前置的Sb/TNR利用短波长的光子产生大量的电子和空穴，而SC提供了比传统的PFC更高的潜力，通过吸收长波光子的传输来驱动电子被传输到阴极。结果还表明，SWENS在长期使用中表现出显著的稳定性，在清洁能源生产和降解各种难降解有机物方面是有效的。这项工作为开发同时用于清洁能源发电和水处理的水-能复合技术提供了一条新的有效途径。
A novel unassisted solar water-energy nexus system (SWENS) comprised of a monolithic photoanode, which was assembled by attaching a silicon cell (SC) at the reverse side of a high-activity hyaline antimony-doped TiO2nanorod array (Sb/TNR), and a Pt-black/Pt cathode was proposed for effective electricity and hydrogen production accompanying water treatment. The Sb/TNR with vertically arranged nanorods on a F-doped SnO2substrate, using a simple hydrothermal method, showed an excellently enhanced and stable photo-to-current density of ∼1.77 mA cm–2(0.6 V vs Ag/AgCl), which is ∼181% that of the undoped sample because antimony doping enhanced the charge-transfer property and charge-carrier density of Sb/TNR. The SWENS showed a removal ratio of nearly 100% for 2-chlorophenol after 4 h of operation under AM 1.5 illumination and achieved an average H2production rate of 31.4 μmol h–1cm–2, an excellent electricity output with an open-circuit voltage of ∼2.16 V, a short-circuit current of ∼1857 μA cm–2, and a maximum power output of ∼967 μW cm–2, which is ∼10.8 times higher than the power density of the reported state-of-the-art photocatalytic fuel cell (PFC). This outstanding capability is due to the synergistic effect of the monolithic photoanode, in which the prepositive Sb/TNR generates abundant electrons and holes using short-wavelength photons, and the SC provides much higher potential than traditional PFCs to drive the electrons being transported to the cathode by absorbing the transmission of longer wavelength photons. The results also revealed that the SWENS showed remarkably stability in long-term application and is effective in clean energy production while degrading various refractory organics. This work proposed a new effective way to develop a composite water-energy nexus technology for simultaneous clean energy generation and water treatment.