Bioproduction of cerium-bearing magnetite and application to improve carbon-black supported platinum catalysts

Xie, Jinxin; Zhao, Ziyu; Coker, Victoria S.; O’Driscoll, Brian; Cai, Rongsheng; Haigh, Sarah J.; Holmes, Stuart M.; Lloyd, Jonathan R.

doi:10.1186/s12951-024-02464-x

Title: Bioproduction of cerium-bearing magnetite and application to improve carbon-black supported platinum catalysts

Journal Article · 24 April 2024 · Journal of Nanobiotechnology

DOI: https://doi.org/10.1186/s12951-024-02464-x · OSTI ID:2471073

Xie, Jinxin ^[1]; Zhao, Ziyu ^[1]; Coker, Victoria S. ^[1]; O’Driscoll, Brian ^[2]; Cai, Rongsheng ^[1]; Haigh, Sarah J. ^[1]; Holmes, Stuart M. ^[1]; Lloyd, Jonathan R. ^[1]

Univ. of Manchester (United Kingdom)
Univ. of Manchester (United Kingdom); Univ. of Ottawa, ON (Canada)

Biogeochemical processing of metals including the fabrication of novel nanomaterials from metal contaminated waste streams by microbial cells is an area of intense interest in the environmental sciences. Here we focus on the fate of Ce during the microbial reduction of a suite of Ce-bearing ferrihydrites with between 0.2 and 4.2 mol% Ce. Cerium K-edge X-ray absorption near edge structure (XANES) analyses showed that trivalent and tetravalent cerium co-existed, with a higher proportion of tetravalent cerium observed with increasing Ce-bearing of the ferrihydrite. The subsurface metal-reducing bacterium Geobacter sulfurreducens was used to bioreduce Ce-bearing ferrihydrite, and with 0.2 mol% and 0.5 mol% Ce, an Fe(II)-bearing mineral, magnetite (Fe(II)(III)₂O₄), formed alongside a small amount of goethite (FeOOH). At higher Ce-doping (1.4 mol% and 4.2 mol%) Fe(III) bioreduction was inhibited and goethite dominated the final products. During microbial Fe(III) reduction Ce was not released to solution, suggesting Ce remained associated with the Fe minerals during redox cycling, even at high Ce loadings. In addition, Fe L_2,3 X-ray magnetic circular dichroism (XMCD) analyses suggested that Ce partially incorporated into the Fe(III) crystallographic sites in the magnetite. The use of Ce-bearing biomagnetite prepared in this study was tested for hydrogen fuel cell catalyst applications. Platinum/carbon black electrodes were fabricated, containing 10% biomagnetite with 0.2 mol% Ce in the catalyst. The addition of bioreduced Ce-magnetite improved the electrode durability when compared to a normal Pt/CB catalyst. Different concentrations of Ce can inhibit the bioreduction of Fe(III) minerals, resulting in the formation of different bioreduction products. Bioprocessing of Fe-minerals to form Ce-containing magnetite (potentially from waste sources) offers a sustainable route to the production of fuel cell catalysts with improved performance.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 2471073

Journal Information:: Journal of Nanobiotechnology, Journal Name: Journal of Nanobiotechnology Journal Issue: 1 Vol. 22; ISSN 1477-3155

Publisher:: BioMed CentralCopyright Statement

Country of Publication:: United States

Language:: English

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59 BASIC BIOLOGICAL SCIENCES
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Geobacter sulfurreducens
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Title: Bioproduction of cerium-bearing magnetite and application to improve carbon-black supported platinum catalysts

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