Photocatalytic Hydrogen Evolution over Exfoliated Rh-Doped Titanate Nanosheets
Photocatalytic Hydrogen Evolution over Exfoliated Rh-Doped Titanate Nanosheets
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DOI：
10.1021/acsomega.0c00204
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发表时间：
2020-04
期刊：
影响因子：
4.1
通讯作者：
W. Soontornchaiyakul;T. Fujimura;Natsumi Yano;Y. Kataoka;R. Sasai
中科院分区：
文献类型：
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作者：
W. Soontornchaiyakul;T. Fujimura;Natsumi Yano;Y. Kataoka;R. Sasai
制备不同量的Rh掺杂的钛酸盐纳米片（Ti 3 NS：Rh（x），其中x是掺杂量）以开发基于金属氧化物化合物的新型纳米结构光催化剂，其可以在阳光下分解水以产生H2。采用酸交换、插层和剥离的方法制备了掺铑层状钛酸钠化合物（Na 2 Ti 3-xRhxO 7）Ti 3 NS：Rh（x）。在Ti 3 NS：Rh（x）胶体悬浮液的漫反射光谱中发现了一个新的能隙，这个新的能隙对应于掺杂在Ti4+位的Rh 3+或Rh 4+的4d能级的电子。研究了以三乙胺（TEA）为电子给体的Ti 3 NS：Rh（x）光催化剂对水中析氢的催化活性。适量的Rh掺杂可以提高Ti 3 NS光催化以三乙胺（TEA）为牺牲剂的析氢活性。其原因与Rh ~（3+）或Rh ~（4+）在Ti ~ 3 NS中的Ti ~（4+）位上的富集状态有关。掺杂1mol%Ti的Rh，Ti 3 NS：Rh（0.03）显示出高达1040 nmol/h的H2释放速率，这是在UV照射（>220 nm）下的未掺杂的Ti 3 NS的约25倍，并且在近UV照射（>340 nm）下的302 nmol/h。这些结果表明，基于Rh掺杂的钛酸盐化合物的新型纳米结构光催化剂的开发是成功的，该纳米结构光催化剂可以在太阳光中存在的近紫外线照射下产生H2。
Various amounts of Rh-doped titanate nanosheets (Ti3NS:Rh(x), where x is doped amount) were prepared to develop a new nanostructured photocatalyst based on metal oxide compounds that can split water to produce H2 under sunlight. Ti3NS:Rh(x) was obtained by acid exchange, intercalation, and exfoliation of Rh-doped layered sodium titanate compound (Na2Ti3–xRhxO7). A new energy gap was found in the diffuse reflection spectrum of the Ti3NS:Rh(x) colloidal suspension solution; this new energy gap corresponds to electrons in the 4d level of Rh3+ or Rh4+, which are doped in the Ti4+ site. A photocatalyst activity of Ti3NS:Rh(x) for H2 evolution in water with triethylamine (TEA) as an electron donor was investigated. The appropriate amount of Rh doping can improve the photocatalytic activity of Ti3NS for H2 evolution from water using triethylamine (TEA) as a sacrifice agent. The reason was related to the rich state of Rh3+ or Rh4+ doped in the Ti4+ site of Ti3NS. Doping Rh 1 mol % of Ti, Ti3NS:Rh(0.03) shows the H2 evolution rates up to 1040 nmol/h, which is about 25 times larger than that of nondoped Ti3NS under UV irradiation (>220 nm) and 302 nmol/h under near-UV irradiation (>340 nm). These results show that the development of new nanostructured photocatalyst based on Rh-doped titanate compounds that can produce H2 under near-UV irradiation present in sunlight was a success.