期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 263, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apcatb.2019.118109
关键词
Carbohydrate; Hydrogen production; Bifunctional electrocatalyst; Perovskite solar cell
资金
- Ministry of Science and Technology of China [2017YFA0206600, 2016YFA0200700]
- China Postdoctoral Science Foundation [2018M633581, 2018M630123]
- Shaanxi Postdoctoral Science Foundation [2018BSHQYXMZZ33]
- Natural Science Basic Research Plan in Shaanxi Province of China [2018JM3027, 2018JQ2038]
- National Natural Science Foundation of China [31771577, 51822301, 21673059, 51803040, 11811530635, 51872240, 51672225]
- CAS Instrument Development Project [YJKYYQ20170037]
- CAS Pioneer Hundred Talents Program
- 1000 Youth Talent Program of China
Hydrogen production via solar-powered water electrolysis allows abundant but intermittent energy to be directly converted into clean fuel in a sustainable manner. However, this method is hindered by the sluggish O-2 evolution reaction (OER). The carbohydrate oxidation reaction (COR) can potentially replace the OER for effective H-2 production with low-energy consumption due to its more favourable thermodynamics. Herein, Co3FePx@NF is used as a carbohydrate-universal catalyst for four representative COR that had a potential of 1.24 V vs RHE (to 10 mA cm(-2)) which was 20% (310 mV) lower than commercial electrocatalysts for OER. In addition, the presence of carbohydrates had no negative effect on the high performance of Co3FePx@NF for hydrogen evolution at cathode. Motivated by the above performance improvements, a novel electrolyzer was developed that integrates H-2 production and COR using Co3FePx@NF as a bifunctional electrocatalyst. A cell voltage of only 1.35 V was required to achieve a current density of 10 mA cm(-2), which was much lower than commercial water splitting systems (nomarlly 1.8 similar to 2.0 V), highlighting that the electrolyzer in this paper has great potential for use in energy-saving H-2 production. Due to the improved design, the electrolyzer can be easily driven by a single perovskite solar cell delivering a solar-to-hydrogen efficiency of 13.3%, which provides a convenient and efficient way to achieve overall-sustainable H-2 production. This work may serve as the foundation for further energy-saving hydrogen production technologies and carbohydrate-containing waste treatment by the rational design of electrolyzers.
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