Photocatalytic activity of hydrothermally synthesized tantalate pyrochlores for overall water splitting
Photocatalytic activity of hydrothermally synthesized tantalate pyrochlores for overall water splitting
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DOI：
10.1016/j.apcata.2005.11.007
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发表时间：
2006-01-26
影响因子：
5.5
通讯作者：
Matsumura, M
中科院分区：
文献类型：
--
作者：
Ikeda, S;Fubuki, M;Matsumura, M
采用水热法合成了钽酸盐和钼酸盐焦磷酸盐Ca 2 M2 O 7（M = Nb，Ta）和A（2）Ta（2）O（6）（A = Na，K）。这些氧化物直接从钽或铌的醇盐中结晶的钠，钾或钙阳离子的存在下，在碱性溶液中，在373和448 K之间的温度，和它们的结晶度通过在空气中煅烧得到改善。在钽酸盐烧绿石上负载少量的氧化镍（NiO）作为产氢催化剂，实现了H-2和O-2的化学计量释放，而NiO负载的钼酸盐烧绿石没有表现出光催化活性。钽酸盐焦磷酸盐的光催化作用归因于其导带底能级比钽酸盐焦磷酸盐的导带底能级负得多。(c)2005 Elsevier B. V.保留所有权利。
Tantalate and mobate pyrochlores, Ca2M2O7 (M = Nb, Ta) and A(2)Ta(2)O(6) (A = Na, K), were prepared by a hydrothermal method. These oxides were crystallized directly from tantalum or niobium alkoxide in the presence of sodium, potassium or calcium cation in basic solutions at temperatures between 373 and 448 K, and their crystallinity was improved by calcination in air. Stoichiometric liberations Of H-2 and O-2 were achieved over tantalate pyrochlores loaded with a small amount of nickel oxide (NiO) as a catalyst for H2 production, while the NiO-loaded mobate pyrochlore showed no photocatalytic, activity. The photocatalytic functions of the tantalate pyrochlores were attributed to their energy levels of the bottom of conduction bands being much more negative than those of the niobate pyrochlores. (c) 2005 Elsevier B.V. All rights reserved.