CHEMICAL SCIENCE

How to improve the stability of photoelectric chemical water decomposition? The latest progress in photoanodic research based on metal oxides/sulfides!


July 4, 2022,Professor Li Liang of Soochow UniversityAn energy journal founded at Tsinghua UniversityNano Research EnergyPublished the latest roundup article titled “Recent research progress on operational stability of metal oxide/sulfide photoanodes in photoelectrochemical cells”.

Figure 1: Schematic diagram of the main context of the article.

Photoelectrochemical (PEC) decomposition of water to hydrogen is based on the photoelectric complementary strategy, and the use of solar energy and electric energy to decompose water to produce hydrogen, so that the loss and dependence of the device on electrical energy is greatly reduced; At the same time, the introduction of applied bias voltage allows the photogenerated electron-hole pair to move in a directional manner in the photoelectrode, reducing the recombination of the photogenerated carrier. Since the water and solar energy on Earth are almost inexhaustible, this technology has attracted a lot of attention. The oxygen evolution reaction that occurs on the photoanode is due to the need for O-H bond breakage and the O-O bond generation stepKinetic response is sluggish, is the main factor limiting the performance of PEC water decomposition. Currently, numerous electrode modification strategies, such asDoping, co-catalyst loading, heterostructure construction, crystal plane control, vacancy introduction, and interface engineeringEtc. have been applied to the modification of photoanodes, and the performance of photoanodes has been substantially improved. In the case of BiVO4, for example, the optical current density has reached a maximum of 6.2 mA cm-2. At the same time, the performance of metal sulphides is as high as 15.35 mA cm-2. However, the ultimate purpose of PEC water decomposition is to solve the energy crisis, so,Large-scale commercialization of hydrogen production is the main research direction in the future。 However, how to ensure the long-term operational stability of the device under actual operating conditions is an urgent problem to be overcome. At present, the long-term stable operation of PEC devices is still not enough to meet the requirements of large-scale commercial applicationsLong-term stable operationIt is a difficult problem to be solved. Therefore, the stability of the photoode is still the core of the further development of PEC water decomposition.

In response to the above problems, The team of Professor Li Liang of Soochow University is currently on the presentBased on the stability of metal oxides and sulfide photoanodes, the relevant researchSummarized and presentedThe main factors that lead to the occurrence of light corrosion phenomena and the corresponding solutions。 It is well known that compared to metal sulfides,Metal oxides have great advantages in terms of stability; For example, titanium dioxide naturally has good stability. However, metal sulfides are well suited as photoodes because of themFeatures narrow band gaps, suitable band positions, and easily accessible vertically ordered nanoarray morphology。 To date, although many literature reports have focused on solving the stability problem of metal sulphides, ultimatelyThe resulting device stability performance still lags far behind metal oxides。 In addition, due to the different photoanode materials, the causes of light corrosion will be slightly different. Therefore, this article is mainlyDiscuss the photocorrosion mechanism of different materialsTo summarize the research work related to the stability of different metal sulfides and metal oxides (Figure 1), and summarize the common manifestations and characterization methods of photocorrod phenomena. The specificity of the photocorrosity mechanism of each material is introducedPhotocorrosity mechanisms and common modification strategies for specific photoanodic materials (BiVO4, WO3, Fe2O3, In2S3, CdS, etc.).。 Finally, passCompare solutions for photoanode materials, discussedPotential photo-corrosion study protocolsand presentedImproves metal sulphide stabilitySome suggestions.

Related paper information:

Linxing Meng, Liang Li. Recent research progress on operational stability of metal oxide/sulfide photoanodes in photoelectrochemical cells. Nano Res. Energy 2022, DOI: 10.26599/NRE.2022.9120020.

https://doi.org/10.26599/NRE.2022.9120020.

As a sister journal of Nano Research, Nano Research Energy (ISSN: 2791-0091; e-ISSN: 2790-8119; Official website: https://www.sciopen.com/journal/2790-8119It was launched in March 2022 and is co-edited by Professor Qu Liangti of Tsinghua University and Professor Chunyi Zhi of the City University of Hong Kong. Nano Research Energy is an international multidisciplinary, all-English open access journal, focusing on the cutting-edge research and application of nanomaterials and nanoscience technology in new energy-related fields, benchmarking against the top international energy journals, and committed to publishing high-level original research and review papers. Before 2023No APC feesTeachers are welcome to submit articles. Please contact the editorial department: Teacher Xue, NanoResearchEnergy@tup.tsinghua.edu.cn.
 
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