还原(数学)
边界层
图层(电子)
流量(数学)
碳纤维
环境科学
材料科学
纳米技术
物理
机械
复合材料
几何学
数学
复合数
作者
Shu Hu,Bin Liu,Qian Zheng,Sheng Xiang,Haoqing Su,Yufang Zheng,Chengxing He,Rito Yanagi,Wentao Zhang,Atsu Kludze
出处
期刊:Research Square - Research Square
日期:2024-02-12
标识
DOI:10.21203/rs.3.rs-3921865/v1
摘要
Abstract The capture and utilization of the dissolved inorganic carbon in seawater, e.g., bicarbonates, is a promising strategy for accessing fuels on demand and anywhere. We report unbiased photoelectrochemical (PEC) CO 2 reduction (CO 2 R) devices, which can facilitate sustainable sunlight-to-syngas conversion. However, there have been very few reports on the use of dissolved inorganic carbon for direct light-driven CO 2 conversion to produce solar fuels. In this work, we design and implement 3D-printed PEC devices that employ a boundary layer flow. The flow over photoanode-photocathode pairs facilitates the efficient transport of in-situ generated CO 2 (aq), which is produced upstream at BiVO 4 photoanodes, to downstream CO 2 R Si photocathodes. In flowing seawater, the solar-to-fuels (STF) efficiency improved from 0.4–0.71%, a record for PEC CO 2 R devices compared with BiVO 4 -Si systems operating in static bicarbonate electrolytes with continuous CO 2 purging. Even in 2.3-mM HCO 3 − seawater, CO selectivity significantly increased from 3–21% with flow. The boundary layer flow confines the in-situ generated CO 2 (aq) to the surface of BiVO 4 and Si photocathodes. Thus, an optimized flow field can increase the CO 2 (aq) and proton transport flux and simultaneously reduce the CO 2 (aq) residence time for its efficient utilization at Si photocathodes. Our process also features a high carbon efficiency: ~ 1 mmol CO 2 is additionally released per 4 mmol CO produced.
科研通智能强力驱动
Strongly Powered by AbleSci AI