Abstract
AbstractAchieving high-efficiency photoelectrochemical water splitting requires a better understanding of ion kinetics, e.g., diffusion, adsorption and reactions, near the photoelectrode’s surface. However, with macroscopic three-dimensional electrodes, it is often difficult to disentangle the contributions of surface effects to the total photocurrent from that of various factors in the bulk. Here, we report a photoanode made from a InSe crystal monolayer that is encapsulated with monolayer graphene to ensure high stability. We choose InSe among other photoresponsive two-dimensional (2D) materials because of its unique properties of high mobility and strongly suppressing electron–hole pair recombination. Using the atomically thin electrodes, we obtained a photocurrent with a density >10 mA cm−2 at 1.23 V versus reversible hydrogen electrode, which is several orders of magnitude greater than other 2D photoelectrodes. In addition to the outstanding characteristics of InSe, we attribute the enhanced photocurrent to the strong coupling between the hydroxide ions and photo-generated holes near the anode surface. As a result, a persistent current even after illumination ceased was also observed due to the presence of ions trapped holes with suppressed electron-hole recombination. Our results provide atomically thin materials as a platform for investigating ion kinetics at the electrode surface and shed light on developing next-generation photoelectrodes with high efficiency.
Publisher
Springer Science and Business Media LLC
Subject
General Physics and Astronomy,General Biochemistry, Genetics and Molecular Biology,General Chemistry
Reference47 articles.
1. Lu, F., Zhou, M., Zhou, Y. & Zeng, X. First-row transition metal based catalysts for the oxygen evolution reaction under alkaline conditions: basic principles and recent advances. Small 13, 1701931:1–18 (2017).
2. Meng, L. et al. A plasma-triggered O-S bond and P-N junction near the surface of a SnS2 nanosheet array to enable efficient solar water oxidation. Angew. Chem. Int. Ed. 58, 16668–16675 (2019).
3. Meng, L. et al. Simultaneous manipulation of O-doping and metal vacancy in atomically thin Zn10In16S34 nanosheet arrays toward improved photoelectrochemical performance. Angew. Chem. Int. Ed. 57, 16882–16887 (2018).
4. Takata, T. et al. Photocatalytic water splitting with a quantum efficiency of almost unity. Nature 581, 411–414 (2020).
5. Wang, H. et al. Highly active deficient ternary sulfide photoanode for photoelectrochemical water splitting. Nat. Commun. 11, 3078:1–11 (2020).
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