Bio-inorganic hybrid photoanodes of photosystem II and ferricyanide-intercalated layered double hydroxide for visible-light-driven water oxidation
Bio-inorganic hybrid photoanodes of photosystem II and ferricyanide-intercalated layered double hydroxide for visible-light-driven water oxidation
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DOI：
10.1016/j.electacta.2018.01.133
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发表时间：
2018-02
影响因子：
6.6
通讯作者：
Masaru Kato;Hisako Sato;Ichizo Yagi;M. Sugiura
中科院分区：
文献类型：
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作者：
Masaru Kato;Hisako Sato;Ichizo Yagi;M. Sugiura
光合作用将太阳能转化为化学能。光系统II（PSII）在太阳光照射下氧化水以产生氧、电子和质子。这种光驱动的水氧化引发了光合作用中的一系列反应。PSII的基本光电化学研究是针对PSII的酶的应用，可持续生产电力或太阳能燃料。为了使PSII在电极基底上的光电化学催化活性最大化，PSII和电极基底之间的界面设计是重要的。在此，我们报告的生物无机光阳极PSII和铁氰化物插层层状双氢氧化物（LDH）可见光驱动的水氧化。将PSII简单地滴铸到铁氰化物插层的钴铝LDH上，然后在可见光照射下，在pH 6.5和+0.5 V vs. NHE下1小时，显示出0.5 ± 0.1 s-1的转换频率和920 ± 40的转换数。利用PSII抑制剂或生物工程PSII的光电化学实验表明，从PSII的质体醌QAsite到铁氰化物的界面电子转移可能在提高PSII的光电催化活性和稳定性方面发挥重要作用。我们的研究将为PSII的基础或高级光电化学研究开辟新的可能性。
Photosynthesis converts solar energy into chemical energy. Photosystem II (PSII) oxidizes water to produce oxygen, electrons and protons under solar light irradiation. This light-driven water oxidation initiates a series of reactions in photosynthesis. Basic photoelectrochemical studies on PSII are directed toward the enzymatic applications of PSII for sustainable production of electricity or solar fuels. To maximize the photoelectrochemical catalytic activity of PSII on electrode substrates, interfacial designs between PSII and electrode substrates are important. Herein, we report bio-inorganic photoanodes of PSII and ferricyanide-intercalated layered double hydroxide (LDH) for visible-light-driven water oxidation. PSII is simply drop-cast onto a ferricyanide-intercalated cobalt–aluminum LDH and then shows a turnover frequency of 0.5 ± 0.1 s−1and a turnover number of 920 ± 40 for 1 h at pH 6.5 at +0.5 V vs. NHE under visible light irradiation. Photoelectrochemical experiments using a PSII inhibitor or a bio-engineered PSII suggest that interfacial electron transfer from the plastoquinone QAsite of PSII to ferricyanide may play an important role in improving the photo-electrocatalytic activity and stability of PSII. Our studies will open up new possibilities in fundamental or advanced photoelectrochemical studies of PSII.