Polyoxometalates-derived metal oxides incorporated into graphitic carbon nitride framework for photocatalytic hydrogen peroxide production under visible light
Polyoxometalates-derived metal oxides incorporated into graphitic carbon nitride framework for photocatalytic hydrogen peroxide production under visible light
复制标题
将多金属氧酸盐衍生的金属氧化物纳入石墨氮化碳骨架中，用于可见光下光催化生产过氧化氢
DOI：
10.1016/j.jcat.2018.08.003
复制
发表时间：
2018
影响因子：
7.3
通讯作者：
Zhao Xu
中科院分区：
文献类型：
--
作者：
Zhao Shen;Zhao Xu
以双氰胺的g- c3n4前驱体和（NH4）3PW12O40（NH4- pw12）的多金属氧酸盐（POMs）前驱体为原料，煅烧制备了g-C3N4-PWO杂化催化剂。g-C3N4-PWO杂化催化剂结构明确、稳定，在可见光下无有机电子给体的情况下，具有良好的光催化过氧化氢性能。由Koutecky-Levich图得到的g-C3N4-PWO （n = 1.73）比g-C3N4（n = 1.29）在氧还原反应（ORR）过程中的电子转移值要高，说明加入g-C3N4骨架中的PWO促进了电子的生成。对苯醌（PBQ）清除剂实验、电子自旋共振（ESR）信号和超氧自由基（自由基dotO2 -）的定量实验结果表明，g- c3n4到g-C3N4-PWO的导带（CB）能级的负移可以增强o2自由基dotO2 -的单电子还原，并进一步促进连续两步单电子o2还原成H2O2的反应。
The hybrid catalyst of g-C3N4-PWO has been prepared through the calcination of the g-C3N4precursor of dicyandiamide and the polyoxometalates (POMs) precursor of (NH4)3PW12O40(NH4-PW12). The hybrid catalyst of g-C3N4-PWO with well-defined and stable structure exhibits efficient catalytic performance for photocatalytic H2O2production in the absence of organic electron donor under visible light. The value of electron transfer during the oxygen reduction reaction (ORR) process obtained from the Koutecky-Levich plot for g-C3N4-PWO (n = 1.73) is higher than that for g-C3N4(n = 1.29), suggesting that the PWO incorporated into g-C3N4framework can promote the electrons generation. Thep-benzoquinone (PBQ) scavenger experiments, the electron spin resonance (ESR) signal and quantitative experiment of superoxide radicals (radical dotO2−) results reveal that the negative shifts of the conduction band (CB) level from g-C3N4to g-C3N4-PWO can enhance the single-electron reduction of O2toradical dotO2−and further promote the sequential two-step single-electron O2reduction reaction to H2O2.