Enhanced Production of Formic Acid in Electrochemical CO2Reduction over Pd-Doped BiOCl Nanosheets

Pin An Hsieh, Peng Jen Chen, Lian Ming Lyu, Sheng Yu Chen, Mei Chun Tseng, Mei Ying Chung, Wei Hung Chiang, Jeng Lung Chen, Chun-Hong Kuo*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Scopus citations


Bismuth oxyhalides (BiOX, X = F, Cl, Br, I) are emerging energy materials because of their remarkable catalytic activity. The BiOX compounds usually have a tetragonal type crystal structure with unique layered morphology consisting of [X-Bi-O-Bi-X] sheets. Although the BiOX nanosheets exposed with {001} facets perform superior photoactivity, there is lack of understanding about their capability in the electrochemical CO2 reduction reaction (CO2RR). Herein, we adopt wet-chemical syntheses to make 2D BiOCl and Pd-doped BiOCl nanosheets for CO2RR. In the results, formic acid is the only one kind of product converted from CO2 along with H2 gas from water reduction over both BiOCl and Pd-doped BiOCl nanosheets. By thorough analyses with ex situ and in situ spectroscopy, the results reflect that (1) metallic Bi0 atoms generated by the applied negative potentials serve as the catalytic sites for the hydrogen evolution reaction (HER) and CO2RR and (2) the existence of doped Pd ions in the BiOCl structure reduces the barrier of charge transfer over the nanosheets, which enhances HER and CO2RR activities. We believe that the observations are important references for making catalysts toward CO2RR performance.

Original languageEnglish
Pages (from-to)58799-58808
Number of pages10
JournalACS Applied Materials and Interfaces
Issue number49
StatePublished - 15 Dec 2021


  • BiOCl
  • CO
  • catalysis
  • electrochemical
  • palladium


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