Co-reporter:Weiguang Ma, Jingfeng Han, Wei Yu, Dong Yang, Hong Wang, Xu Zong, and Can Li
ACS Catalysis 2016 Volume 6(Issue 9) pp:6198
Publication Date(Web):August 9, 2016
DOI:10.1021/acscatal.6b01772
Hydrogen sulfide (H2S) has been considered as a potential hydrogen source. Identifying efficient solar-driven processes and low-cost materials that can extract hydrogen from H2S is highly attractive. Herein, for the first time, we reported the establishment of a perovskite photovoltaic-electrolysis (PV-EC) H2S splitting system by integrating a single perovskite solar cell, noble-metal-free catalysts, and H2S splitting reaction with the aid of mediators. The as-established system delivered a solar-to-chemical energy conversion efficiency of up to 13.5% during the PV-EC step by using molybdenum–tungsten phosphide (Mo–W–P) as the catalyst for a hydrogen evolution reaction (HER) and a graphite carbon sheet as the catalyst for the oxidation of mediators, respectively. To the best of our knowledge, this is among the highest value ever reported for the artificial conversion of solar to chemical energy using perovskite solar cells. Moreover, upon integration with the PV-EC system, a H2S splitting reaction with a net energy conversion efficiency of 3.5% can be accomplished, and the overall energy consumption to obtain an equivalent amount of H2 from H2S is reduced by ca. 43.3% compared with that from water splitting. This paradigm of producing value-added chemicals by consuming negative value waste products is solely based on low-cost materials and a simpler system configuration, which significantly improves the economic sustainability of the process.Keywords: H2S splitting; noble-metal-free catalysts; perovskite photovoltaics; redox mediators; solar energy conversion
Co-reporter:Dr. Wangyin Wang;Hong Wang;Qingjun Zhu;Dr. Wei Qin;Dr. Guangye Han;Dr. Jian-Ren Shen;Dr. Xu Zong;Dr. Can Li
Angewandte Chemie International Edition 2016 Volume 55( Issue 32) pp:9229-9233
Publication Date(Web):
DOI:10.1002/anie.201604091
Abstract
Integrating natural and artificial photosynthetic platforms is an important approach to developing solar-driven hybrid systems with exceptional function over the individual components. A natural–artificial photosynthetic hybrid platform is formed by wiring photosystem II (PSII) and a platinum-decorated silicon photoelectrochemical (PEC) cell in a tandem manner based on a photocatalytic-PEC Z-scheme design. Although the individual components cannot achieve overall water splitting, the hybrid platform demonstrated the capability of unassisted solar-driven overall water splitting. Moreover, H2 and O2 evolution can be separated in this system, which is ascribed to the functionality afforded by the unconventional Z-scheme design. Furthermore, the tandem configuration and the spatial separation between PSII and artificial components provide more opportunities to develop efficient natural–artificial hybrid photosynthesis systems.
Co-reporter:Dr. Wangyin Wang;Hong Wang;Qingjun Zhu;Dr. Wei Qin;Dr. Guangye Han;Dr. Jian-Ren Shen;Dr. Xu Zong;Dr. Can Li
Angewandte Chemie 2016 Volume 128( Issue 32) pp:9375-9379
Publication Date(Web):
DOI:10.1002/ange.201604091
Abstract
Integrating natural and artificial photosynthetic platforms is an important approach to developing solar-driven hybrid systems with exceptional function over the individual components. A natural–artificial photosynthetic hybrid platform is formed by wiring photosystem II (PSII) and a platinum-decorated silicon photoelectrochemical (PEC) cell in a tandem manner based on a photocatalytic-PEC Z-scheme design. Although the individual components cannot achieve overall water splitting, the hybrid platform demonstrated the capability of unassisted solar-driven overall water splitting. Moreover, H2 and O2 evolution can be separated in this system, which is ascribed to the functionality afforded by the unconventional Z-scheme design. Furthermore, the tandem configuration and the spatial separation between PSII and artificial components provide more opportunities to develop efficient natural–artificial hybrid photosynthesis systems.
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