Spontaneous Solar Syngas Production from CO2 Driven by Energetically Favorable Wastewater Microbial Anodes
Spontaneous Solar Syngas Production from CO2 Driven by Energetically Favorable Wastewater Microbial Anodes
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DOI：
10.1016/j.joule.2020.08.014
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发表时间：
2020-10-14
期刊：
影响因子：
39.8
通讯作者：
Gu, Jing
中科院分区：
文献类型：
--
作者：
Lu, Lu;Li, Zhida;Gu, Jing
光电化学（PEC）将CO2还原为合成气是太阳能转化为燃料的一种有吸引力的策略。然而，高过电位、选择性不足和高成本要求替代解决方案。在这里，我们展示了一种混合微生物光电化学（MPEC）系统，该系统包含一个微生物阳极能够氧化废水中的有机废物，并降低了1.1 V的氧化电位相比，非生物水氧化使用PEC阳极。此外，MPEC采用电源管理电路（PMC），使并行的低能量产生的反应在同一溶液介质中操作，以克服高过电位反应。集成了选择性单原子镍催化剂（Si NW/Ni SA）的纳米线硅光电阴极实现了高达80%的CO产生法拉第效率，具有高度可调的CO：H-2生成比（0.1至6.8）。当生物阳极与Si NW/Ni SA耦合时，获得高达1.1 mA cm（-2）的自发光电流密度用于高速率合成气产生。
The photoelectrochemical (PEC) reduction of CO2 to syngas is an attractive strategy for solar-to-fuel conversion. However, the high overpotential, inadequate selectivity, and high cost demand for alternative solutions. Here, we demonstrate a hybrid microbial photoelectrochemical (MPEC) system that contains a microbial anode capable of oxidizing waste organics in wastewater and reducing the oxidation potential by 1.1 V compared with abiotic water oxidation using a PEC anode. Moreover, the MPEC employs a power management circuit (PMC) to enable parallel low-energy-producing reactions operated in the same solution medium to conquer high-overpotential reactions. The nanowire silicon photocathode integrated with a selective single-atom nickel catalyst (Si NW/Ni SA) achieved up to similar to 80% faradic efficiency for CO generation with a highly tunable CO:H-2 generation ratio (0.1 to 6.8). When the bioanode was coupled with the Si NW/Ni SA, up to 1.1 mA cm(-2) of spontaneous photocurrent density was obtained for high-rate syngas generation.