Raw sugarcane juice assisted hybrid electrolysis for formic acid and hydrogen production based on reversible redox cycle of CoNi LDH

作者：Liu, Yunpeng; Chen, Zhongxin; Yang, Yunyi; Zou, Ren; Deng, Binglu; Zhong, Linxin; Loh, Kian Ping; Peng, Xinwen^*

来源：Applied Catalysis B: Environmental , 2023, 331: 122559.

DOI：10.1016/j.apcatb.2023.122559

• Hybrid electrolysis
• Sucrose oxidation
• Solar -driven device
• Raw sugarcane juice
• Hydrogen production

The major bottleneck in self-powered water splitting devices by renewable energy lies in the kinetically sluggish oxygen evolution reaction (OER), which only produces low-value oxygen. Herein, we explore sucrose electro-oxidation as an alternative anodic reaction for production of valuable chemicals at a reduced electricity con-sumption. By developing a reversible redox cycle of Ni2+/Ni3+ and Co2+/Co3+ in the CoNi layered double hydroxide (LDH), the required voltage of sucrose oxidation for 100 mA cm-2 is reduced by 240 mV compared to oxygen evolution. The sucrose electrooxidation by CoNi LDH is a two-step reaction including the electro-oxidation of Ni2+/Co2+ to Ni3+/Co3+ and the spontaneous reaction between Ni3+/Co3+ and sucrose. By feeding with natural sugarcane juice, a solar-driven electrolyser is assembled for the co-production of value-added formic acid and hydrogen. Our work demonstrates a sustainable route for integrating hydrogen production and biomass electrooxidation for energy applications.

• 单位
  佛山科学技术学院