Ionic-caged heterometallic bismuth-platinum complex exhibiting electrocatalytic CO2 reduction

Takefumi Yoshida, Habib Md Ahsan, Hai Tao Zhang, David Chukwuma Izuogu, Hitoshi Abe, Hiroyoshi Ohtsu, Tadashi Yamaguchi, Brian K. Breedlove, Alex J.W. Thom, Masahiro Yamashita

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


An air-stable heterometallic Bi-Pt complex with the formula [BiPt(SAc)5]n (1; SAc = thioacetate) was synthesized. The crystal structure, natural bond orbital (NBO) and local orbital locator (LOL) analyses, localized orbital bonding analysis (LOBA), and X-ray absorption fine structure (XAFS) measurements were used to confirm the existence of Bi-Pt bonding and an ionic cage of O atoms surrounding the Bi ion. From the cyclic voltammetry (CV) and controlled potential electrolysis (CPE) experiments, 1 in tetrahydrofuran reduced CO2 to CO, with a faradaic efficiency (FE) of 92% and a turnover frequency (TOF) of 8 s-1 after 30 min of CPE at -0.79 V vs. NHE. The proposed mechanism includes an energetically favored pathway via the ionic cage, which is supported by the results of DFT calculations and reflectance infrared spectroelectrochemistry data.

Original languageEnglish
Pages (from-to)2652-2660
Number of pages9
JournalDalton Transactions
Issue number8
Publication statusPublished - 2020 Feb 28


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