Guo Wenlong, Li Meng, Wang Shanshan, He Yu, Zhou Yun, Lian Xin
Chongqing Key Laboratory of Green Catalysis Materials and Technology, College of Chemistry, Chongqing Normal University, Chongqing 401331, P. R. China.
College of Chemistry and Chemical Engineering, Chongqing University of Science and Technology, Chongqing 401331, P. R. China.
Langmuir. 2024 Sep 13. doi: 10.1021/acs.langmuir.4c02510.
Hydrogen peroxide (HO) production on the anode is more valuable than oxygen and chlorine evolution for photoelectrochemical saline water splitting. In this work, by the introduction of bicarbonate (HCO), HO is produced from saline water (2 M KHCO + 0.5 M NaCl aqueous solution) via the two-electron water oxidation reaction by a photoanode of bismuth vanadate (BiVO). Furthermore, the Faradaic efficiency (FE) and accumulation for HO are improved by coating antimony tetroxide (SbO) on BiVO. A HO FE of 26% at 1.54 V vs RHE is obtained by SbO/BiVO and 49 ppm of HO is accumulated after a 135 min chronoamperometry. Similar to that in KHCO pure water solution, infrared spectroscopy and electrochemical analysis confirm that HCO plays a surface-mediating role in the formation of HO in KHCO saline water solution. The presence of HCO in the electrolyte is able to not only increase the photocurrent density but also effectively inhibit the chlorine evolution reaction.
在光电化学盐水分解中，阳极上产生过氧化氢（HO）比析氧和析氯更有价值。在这项工作中，通过引入碳酸氢根（HCO），利用钒酸铋（BiVO）光阳极通过双电子水氧化反应从盐水（2 M KHCO + 0.5 M NaCl水溶液）中产生HO。此外，通过在BiVO上涂覆四氧化二锑（SbO）提高了HO的法拉第效率（FE）和积累量。SbO/BiVO在相对于可逆氢电极（RHE）为1.54 V时获得了26%的HO FE，在135分钟计时电流法后积累了49 ppm的HO。与在KHCO纯水溶液中类似，红外光谱和电化学分析证实HCO在KHCO盐水溶液中HO的形成中起表面介导作用。电解质中HCO的存在不仅能够增加光电流密度，而且能有效抑制析氯反应。
