Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Oxynitride Thin Films versus Particle-Based Photoanodes: a Comparative
  Study for Photoelectrochemical Solar Water Splitting   The solar water splitting process assisted by semiconductor photocatalysts
attracts growing research interests worldwide for the production of hydrogen as
a clean and sustainable energy carrier. Due to their optical and electrical
properties several oxynitride materials show great promise for the fabrication
of efficient photocatalysts for solar water splitting. This study reports a
comparative investigation of particle- and thin films-based photocatalysts
using three different oxynitride materials. The absolute comparison of the
photoelectrochemical activities favors the particle-based electrodes due to the
better absorption properties and larger electrochemical surface area. However,
thin films surpass the particle-based photoelectrodes due to their more
suitable morphological features that improve the separation and mobility of the
photo-generated charge carriers. Our analysis identifies what specific insights
into the properties of materials can be achieved with the two complementary
approaches.

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The categories of this paper are: hep-ph
11
The categories of this paper are: hep-lat
29
The categories of this paper are: funct-an
31
The categories of this paper are: ao-sci
34
The categories of this paper are: chem-ph
15
The categories of this paper are: nucl-ex
9
The categories of this paper are: nlin
28
The categories of this paper are: alg-geom
2
The categories of this paper are: math
26
The categories of this paper are: bayes-an
14
The categories of this paper are: math-ph
24
The categories of this paper are: dg-ga
13
The categories of this paper are: quant-ph
22
The categories of this paper are: chao-dyn
16
The categories of this paper are: stat
36
The categories of this paper are: cmp-lg