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| p-n异质结BiVO4/g-C3N4光阳极的制备及其光电化学水解性能 | |
| 引用本文： | 王如意,徐国良,杨蕾,邓崇海,储德林,张苗,孙兆奇. p-n异质结BiVO4/g-C3N4光阳极的制备及其光电化学水解性能[J]. 无机材料学报, 2023, 38(1): 87-96. DOI: 10.15541/jim20220439 |
| 作者姓名： | 王如意 徐国良 杨蕾 邓崇海 储德林 张苗 孙兆奇 |
| 作者单位： | 1.合肥学院 能源材料与化工学院, 合肥 230601 2.合肥学院 先进电池材料与技术重点实验室, 合肥 230601 3.长鑫存储技术有限公司, 合肥 230000 4.安徽大学 物质科学与信息技术研究院, 合肥 230039 5.安徽大学 材料科学与工程学院, 合肥 230039 |
| 基金项目： | 国家自然科学基金(61804039);安徽省高校自然科学研究项目(KJ2021A1017);合肥学院人才科研项目(20RC35);安徽省高校协同创新项目(GXXT-2021-013);合肥学院研究生教育教学研究项目(2021Yjyxm01);安徽省高校学科(专业)拔尖人才学术资助项目(gxbjZD2021085);安徽省重点研究与开发计划(201904b11020040) |
| 摘 要： | 钒酸铋(BVO)可用于光电化学(PEC)水解产氢,但受限于其缓慢的表面水氧化动力学,在电极表面修饰单一的析氧助催化剂达不到理想的性能。本工作在BVO电极表面修饰FeNiOx助催化剂可以显著降低起始电压,增强光电化学性能。此外,沉积g-C3N4后修饰FeNiOx助催化剂得到的光电极具有更优异的性能。厚度适合的g-C3N4纳米片与BVO构成Ⅱ型p-n异质结,有效抑制了光生电子空穴的复合,促进了电极的电荷分离。电化学测试结果表明,沉积了g-C3N4后,电极的电荷分离效率达到88.2%,比BVO/FeNiOx (60.6%)提升了近1.5倍。经过g-C3N4和FeNiOx协同修饰的BVO/g-C3N4/Fe Ni Ox电极,表面电荷注入效率达到了90.2%,同时,在1.... |
| 关 键 词： | g-C3N4纳米片 BiVO4 光电化学水解 FeNiOx助催化剂 p-n异质结 |
| 收稿时间： | 2022-07-28 |
| 修稿时间： | 2022-09-25 |
p-n Heterostructured BiVO4/g-C3N4 Photoanode: Construction and Its Photoelectrochemical Water Splitting Performance |
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| WANG Ruyi,XU Guoliang,YANG Lei,DENG Chonghai,CHU Delin,ZHANG Miao,SUN Zhaoqi. p-n Heterostructured BiVO4/g-C3N4 Photoanode: Construction and Its Photoelectrochemical Water Splitting Performance[J]. Journal of Inorganic Materials, 2023, 38(1): 87-96. DOI: 10.15541/jim20220439 | |
| Authors: | WANG Ruyi XU Guoliang YANG Lei DENG Chonghai CHU Delin ZHANG Miao SUN Zhaoqi |
| Affiliation: | 1. School of Energy Materials and Chemical Engineering, Hefei University, Hefei 230601, China 2. Key Laboratory of Materials and Technologies for Advanced Batteries, Hefei University, Hefei 230601, China 3. Changxin Memory Technologies, Inc., Hefei 230000, China 4. Institute of Physical Science and Information Technology, Anhui University, Hefei 230039, China 5. School of Materials Science and Engineering, Anhui University, Hefei 230039, China |
| Abstract: | Bismuth vanadate (BVO) can be used for photoelectrochemical (PEC) water splitting to hydrogen. However, suffering from its high charge-recombination and slow surface catalytic reaction, the PEC performance is far below the expectation, and the modification of the co-catalysts only on the electrode cannot overcome this disadvantage. Here, we report FeNiOx cocatalyst decorated on the BVO photoanode, which can restrict the onset potential and improve the PEC performance. Moreover, a more effective dual modified-BVO photoanode is formed, with the loading of g-C3N4 before decoration of FeNiOx cocatalyst. The type-II p-n heterojunction composed by g-C3N4 nanosheets and BVO, can inhibit recombination of photogenerated charge, and promote the separation of charge effectively at the electrode. Results show that the charge separation efficiency of the electrode reaches 88.2% after the insertion of g-C3N4, which is nearly 1.5 times that of BVO/FeNiOx (60.6%). Moreover, surface charge injection efficiency of the dual-modified BVO/g-C3N4/FeNiOx electrode reaches 90.2%, while the current density reaches 4.63 mA∙cm-2 at 1.23 V (vs. RHE). This work provides a facile approach to develope high performance photoanodes for PEC water splitting. |
| Keywords: | g-C3N4 nanosheets BiVO4 PEC water splitting FeNiOx co-catalyst p-n heterojunction |
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