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在ZnFe₂O₄上共享边缘八面体协调的NiFe双活性位点,用于光电化学水氧化

Zhiyong Jiang¹, Xiaodi Zhu¹, Zhiyu Wang¹

¹National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui, 230029, China.

Advanced science (Weinheim, Baden-Wurttemberg, Germany)

|June 1, 2023

概括

研究人员开发了一种盐方法,将引入铁表面,显著提高光电化学水分裂效率. 该策略通过创建用于氧化水的双Ni-Fe活性位点来增强太阳能转换.

科学领域:

材料科学材料科学材料科学
电化学电化学电化学
催化剂是一种催化剂.

背景情况:

脊柱氧化物 (AB₂ O₄) 对于电化学反应至关重要,八面体位点 (B_Oh) 的特性决定了性能.
由于其复杂的晶体结构,很难精确地操纵螺旋氧化物的结构.
光电化学 (PEC) 水分工需要高效的光电极来转换太阳能.

研究的目的:

开发一种多功能盐策略,用于将Ni2+引入铁 (ZnFe2O4,ZFO) 表面的B位点.
增强光电化学 (PEC) 水分的活性点.
调查修改后的ZFO的结构和电化学特性,以提高PEC性能.

主要方法:

盐介导合成,将Ni2+引入铁酸盐 (ZFO) 的表面.
综合的结构特征分析引入的Ni2+的局部结构.
光电化学测量,包括光电流密度和开通电路潜力,以评估水氧化性能.

主要成果:

修改后的光电极 (ZFO-MSNi) 呈现出≈450mV的显著阴极转移和≈0.6V的启动电压.
在1.23V_RHE的光电流密度中,PEC的水氧化与裸体ZFO相比翻了三倍.
尼2+和邻近的Fe3-σ) +网站形成了Ni-Fe双活跃站点,在边缘共享的八面体配置中,减少了表面的捕获状态.

结论:

盐策略有效地将Ni2+引入ZFO,为增强PEC水氧化创造双Ni-Fe活性位点.
经过修改的ZFO-MSNi在PEC水分中表现出卓越的性能,显示了太阳能能量转换的潜力.
这项工作提出了一种多功能方法,用于调整光电极的表面活性位点,以改善太阳能应用.

关键词:

双重活动场所是双重活动场所.融盐是一种融化盐.斯皮内尔费里特是一种铁矿.超低的开始潜力.水的分裂是水的分裂.

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