DataVXAdvanced Energy MaterialsPaper
journal article·2023-09Open access

Tantalum Nitride‐Enabled Solar Water Splitting with Efficiency Above 10%

Yuriy Pihosh, Vikas Nandal, Tomohiro Higashi, Ryota Shoji, Raman Bekarevich, Hiroshi Nishiyama, Taro Yamada, Valeria Nicolosi, Takashi Hisatomi, Hiroyuki Matsuzaki, Kazuhiko Seki, Kazunari Domen

Advanced Energy Materials· Volume 13· Issue 36
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Source abstract

Abstract

Abstract Designing photoanode semiconducting materials with visible‐light absorption and minimal charge‐carrier recombination for achieving efficient solar‐to‐hydrogen (STH) conversion is challenging. Here, hybrid Ta3N5 nanorods and thin films are developed on transparent GaN/Al2O3 substrates. A Ta3N5 photoanode with a loaded cocatalyst achieves the best current density, i.e. 10.8 mA cm−2, at 1.23 V versus the reversible hydrogen electrode under simulated AM 1.5G solar illumination. In a tandem configuration with dual‐CuInSe2 photovoltaic cells, this semi‐transparent photoanode achieves a reproducible STH energy conversion efficiency of ≈12% (the highest among photocatalytic materials), and remains at more than 10% for 6.7 h of tandem device operation. Detailed transient absorption spectroscopy and theoretical analysis indicates that this high performance originates from efficient light absorption and hole utilization inside the Ta3N5 material. The results show the feasibility of suppressing dominant optical and charge‐carrier‐ recombination losses by using nanostructured visible‐light‐absorbing materials for practical STH conversion.
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Research context

NanomaterialsElectronic materialsCatalysis & surfaces

OpenAlex topics: Advanced Photocatalysis Techniques · Perovskite Materials and Applications · Quantum Dots Synthesis And Properties

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Office of University Professors The University of Tokyo 2‐11‐16 Yayoi, Bunkyo‐ku Tokyo 113–8656 Japan

Global Zero Emission Research Center National Institute of Advanced Industrial Science and Technology Tsukuba 16‐1 Onogawa Ibaraki 305–8569 Japan

Institute for Tenure Track Promotion University of Miyazaki 1‐1 Gakuen‐Kibanadai‐Nishi Miyazaki 889–2192 Japan

Research Institute for Material and Chemical Measurement National Metrology Institute of Japan (NMIJ) National Institute of Advanced Industrial Science and Technology Tsukuba, 1‐1‐1 Higashi Ibaraki 305–8565 Japan

Advanced Microscopy Laboratory Centre for Research on Adaptive Nanostructures and Nanodevices (CRANN) Trinity College Dublin Dublin 2 D02 DA31 Ireland

School of Chemistry Centre for Research on Adaptive Nanostructures and Nanodevices (CRANN) and Advanced Materials and Bioengineering Research Centre (AMBER) Trinity College Dublin Dublin 2 D02 W9K7 Ireland

Research Initiative for Supra‐Materials Interdisciplinary Cluster for Cutting Edge Research Shinshu University 4‐17‐1 Wakasato, Nagano‐shi Nagano 380–8553 Japan

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