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. 2022 Mar 17;13:1400. doi: 10.1038/s41467-022-29102-0

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© The Author(s) 2022

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 2 — a The evolution rates of CH₄ and CO in pure CO₂. b On-line monitoring of O₂ evolution during the photocatalytic reaction over Pd-HPP-TiO₂. c Photocurrent response during light on-off cycling. d Comparison of the CH₄ evolution rates in pure CO₂ and air. e The conversion yield of CO₂ by measuring the CO₂ concentration. f Effect of O₂ concentration (vol%) in CO₂/O₂ gas mixture on the CH₄ evolution rate. The results in (a, d, e, f) are the average values of three parallel experiments. The error bar represents the standard deviation of the measurements.