Unbiased solar H2 production with current density up to 23 mA cm-2 by Swiss-cheese black Si coupled with wastewater bioanode
Unbiased solar H2 production with current density up to 23 mA cm-2 by Swiss-cheese black Si coupled with wastewater bioanode
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DOI：
10.1039/c8ee03673j
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发表时间：
2019-03-01
影响因子：
32.5
通讯作者：
Ren, Zhiyong Jason
中科院分区：
文献类型：
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作者：
Lu, Lu;Vakki, Waltteri;Ren, Zhiyong Jason
具有高效率和耐久性的无偏光电化学制氢对于太阳能存储是高度期望的。在这里，我们报告了一个微生物光电化学（MPEC）系统，表现出上级性能时，配备了生物阳极和黑硅光电阴极与独特的瑞士奶酪接口。MPEC利用废水有机物中嵌入的化学能来促进太阳能H-2的产生，这克服了阳极H2O氧化的障碍。在没有任何偏压的情况下，MPEC产生创纪录的光电流（高达23 mA cm（-2）），并保持长期稳定性超过90小时，具有高法拉第效率（96-99%）。在90 h内，MoSx催化剂的计算周转数为495471，平均频率为1.53 s（-1）。该系统用实际废水代替阳极上的纯水，实现了每天16 kgCOD m（-2）光电阴极的有机物去除。同时废水处理和低成本设计的成本信用使光电化学H-2生产首次成为现实。
Unbiased photoelectrochemical hydrogen production with high efficiency and durability is highly desired for solar energy storage. Here, we report a microbial photoelectrochemical (MPEC) system that demonstrated superior performance when equipped with bioanodes and black silicon photocathode with a unique Swiss-cheese interface. The MPEC utilizes the chemical energy embedded in wastewater organics to boost solar H-2 production, which overcomes barriers on anode H2O oxidation. Without any bias, the MPEC generates a record photocurrent (up to 23 mA cm(-2)) and retains prolonged stability for over 90 hours with high Faradaic efficiency (96-99%). The calculated turnover number for MoSx catalyst during a 90 h period is 495471 with an average frequency of 1.53 s(-1). The system replaced pure water on the anode with actual wastewater and achieved waste organic removal up to 16 kg COD m(-2) photocathode per day. Cost credits from concurrent wastewater treatment and low-cost design make photoelectrochemical H-2 production practical for the first time.