Fabrication of efficient TaON and Ta3N5 photoanodes for water splitting under visible light irradiation
Fabrication of efficient TaON and Ta3N5 photoanodes for water splitting under visible light irradiation
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DOI：
10.1039/c1ee01878g
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发表时间：
2011-10-01
影响因子：
32.5
通讯作者：
Abe, Ryu
中科院分区：
文献类型：
--
作者：
Higashi, Masanobu;Domen, Kazunari;Abe, Ryu
在导电玻璃载体(FTO)上制备了高效的TaON和Ta3N5光阳极。在TaON(或Ta3N5)粒子之间形成有效接触的颈缩处理显著增加了光电流。此外，负载IrO2中心点状NH(2)O纳米粒子作为水氧化的助催化剂，提高了TaON(或Ta3N5)光阳极的光电流。在Na2SO4溶液中，与可逆氢电极(RHE)相比，Taon和Ta3N5光阳极在1.15V电压下的入射光子电荷载流子效率(IPCE)分别在400 nm和500 nm时分别为76%和31%。在外加偏压(Taon：>；0.6V，Ta3N5：>；1.0V)下，用IrO2中心点NH(2)O负载TaON(或Ta3N5)光阳极结合铂电极，在可见光下将水分解为H-2和O-2。
Efficient TaON and Ta3N5 photoanodes for water splitting were fabricated on conducting glass support (FTO). A necking treatment, which forms effective contacts between TaON (or Ta3N5) particles, afforded a significant increase in the photocurrent. Furthermore, loading of IrO2 center dot nH(2)O nanoparticles as a cocatalyst for water oxidation improved the photocurrent of the TaON (or Ta3N5) photoanode. The incident photon to charge carrier efficiencies (IPCEs) of the TaON and Ta3N5 photoanodes were calculated to be ca. 76% at 400 nm and ca. 31% at 500 nm, respectively, at 1.15 V vs. reversible hydrogen electrode (RHE) in aqueous Na2SO4 solution. Overall water splitting into H-2 and O-2 under visible light was demonstrated using an IrO2 center dot nH(2)O-loaded TaON (or Ta3N5) photoanode combined with a Pt electrode under an externally applied bias (TaON: > 0.6 V, Ta3N5: > 1.0 V).