Selective CO Production by Photoelectrochemical Methane Oxidation on TiO2

Li, Wei; He, Da; Hu, Guoxiang; Li, Xiang; Banerjee, Gourab; Li, Jingyi; Lee, Shin Hee; Dong, Qi; Gao, Tianyue; Brudvig, Gary W.; Waegele, Matthias M.; Jiang, De-en; Wang, Dunwei

doi:10.1021/acscentsci.8b00130

Title: Selective CO Production by Photoelectrochemical Methane Oxidation on TiO₂

Journal Article · Mon Apr 23 00:00:00 EDT 2018 · ACS Central Science

DOI:https://doi.org/10.1021/acscentsci.8b00130· OSTI ID:1498722

Li, Wei ^[1]; He, Da ^[1]; Hu, Guoxiang ^[2];

^[1]; Banerjee, Gourab ^[3];

^[1]; Lee, Shin Hee ^[3];

^[1]; Gao, Tianyue ^[1];

^[3];

^[1];

^[2];

^[1]

Boston College, Chestnut Hill, MA (United States)
Univ. of California, Riverside, CA (United States)
Yale Univ., New Haven, CT (United States)

The inertness of the C–H bond in CH₄ poses significant challenges to selective CH₄ oxidation, which often proceeds all the way to CO₂ once activated. Selective oxidation of CH₄ to high-value industrial chemicals such as CO or CH₃OH remains a challenge. Presently, the main methods to activate CH₄ oxidation include thermochemical, electrochemical, and photocatalytic reactions. Of them, photocatalytic reactions hold great promise for practical applications but have been poorly studied. Existing demonstrations of photocatalytic CH₄ oxidation exhibit limited control over the product selectivity, with CO₂ as the most common product. The yield of CO or other hydrocarbons is too low to be of any practical value. In this work, we show that highly selective production of CO by CH4 oxidation can be achieved by a photoelectrochemical (PEC) approach. Under our experimental conditions, the highest yield for CO production was 81.9%. The substrate we used was TiO₂ grown by atomic layer deposition (ALD), which features high concentrations of Ti³⁺ species. The selectivity toward CO was found to be highly sensitive to the substrate types, with significantly lower yield on P25 or commercial anatase TiO₂ substrates. Moreover, our results revealed that the selectivity toward CO also depends on the applied potentials. Based on the experimental results, we proposed a reaction mechanism that involves synergistic effects by adjacent Ti sites on TiO₂. Spectroscopic characterization and computational studies provide critical evidence to support the mechanism. Furthermore, the synergistic effect was found to parallel heterogeneous CO₂ reduction mechanisms. Our results not only present a new route to selective CH₄ oxidation, but also highlight the importance of mechanistic understandings in advancing heterogeneous catalysis.

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Research Organization:: Yale Univ., New Haven, CT (United States); Univ. of California, Riverside, CA (United States)

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

Grant/Contract Number:: FG02-05ER15646; AC02-05CH11231

OSTI ID:: 1498722

Journal Information:: ACS Central Science, Vol. 4, Issue 5; ISSN 2374-7943

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 34 works

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