General and Robust Photothermal-Heating-Enabled High-Efficiency Photoelectrochemical Water Splitting
General and Robust Photothermal-Heating-Enabled High-Efficiency Photoelectrochemical Water Splitting
复制标题
通用且鲁棒的光热加热高效光电化学水分解
DOI：
10.1002/adma.202004406
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发表时间：
2021-03-18
影响因子：
29.4
通讯作者：
Liu, Xueqin
中科院分区：
文献类型：
--
作者：
He, Bing;Jia, Songru;Liu, Xueqin
光阳极同时适应光吸收、电荷分离和水氧化过程的能力代表了高效光电化学（PEC）水分解的重要努力。本文报道了一种强大的策略，通过将光热Co3O4层夹在BiVO4光阳极膜和FeOOH/NiOOH电催化剂片之间，显着改善了PEC的水分解。在近红外照射下，沉积的Co3O4层表现出明显的光热效应，提高了原位光阳极的温度，从而延长了光吸收，增强了电荷转移，同时加速了水氧化动力学。与可逆参考电极（V- rhe）相比，精心设计的NiOOH/FeOOH/Co3O4/BiVO4光阳极在1.23 V下具有6.34 mA cm（-2）的优越光电流密度，在0.6 V- rhe下具有出色的应用偏压光子电流效率2.72%。除了金属氧化物，各种各样的金属硫化物、氮化物和磷化物（例如，CoS、CoN和CoP）都可以作为加热器来生产高性能的bivo4基光阳极。除了BiVO4，其他金属氧化物（如Fe2O3和TiO2）也可以被光热材料覆盖，从而显著促进水的分解。这种简单而通用的策略提供了一个独特的平台，可以利用其光热特性来设计高性能的能量转换和存储材料和设备。
The ability of photoanodes to simultaneously tailor light absorption, charge separation, and water oxidation processes represents an important endeavor toward highly efficient photoelectrochemical (PEC) water splitting. Here, a robust strategy is reported to render markedly improved PEC water splitting via sandwiching a photothermal Co3O4 layer between a BiVO4 photoanode film and an FeOOH/NiOOH electrocatalyst sheet. The deposited Co3O4 layer manifests compelling photothermal effect upon near-infrared irradiation and raises the temperature of the photoanodes in situ, leading to extended light absorption, enhanced charge transfer, and accelerated water oxidation kinetics simultaneously. The judiciously designed NiOOH/FeOOH/Co3O4/BiVO4 photoanode renders a superior photocurrent density of 6.34 mA cm(-2) at 1.23 V versus a reversible reference electrode (V-RHE) with outstanding applied bias photon-to-current efficiency of 2.72% at 0.6 V-RHE. In addition to the metal oxide, a wide variety of metal sulfides, nitrides, and phosphides (e.g., CoS, CoN, and CoP) can be exploited as the heaters to yield high-performance BiVO4-based photoanodes. Apart from BiVO4, other metal oxides (e.g., Fe2O3 and TiO2) can also be covered by photothermal materials to impart significantly promoted water splitting. This simple yet general strategy provides a unique platform to capitalize on their photothermal characteristics to engineer high-performing energy conversion and storage materials and devices.