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NiO Nanoparticles Anchored on Phosphorus‐Doped α‐Fe2O3 Nanoarrays: An Efficient Hole Extraction p–n Heterojunction Photoanode for Water Oxidation
ChemSusChem ( IF 8.4 ) Pub Date : 2018-06-13 , DOI: 10.1002/cssc.201800571
Feng Li 1 , Jing Li 1 , Jie Zhang 2 , Lili Gao 1 , Xuefeng Long 1 , Yiping Hu 1 , Shuwen Li 1 , Jun Jin 1 , Jiantai Ma 1
Affiliation  

The photoelectrochemical (PEC) water‐splitting efficiency of a hematite‐based photoanode is still far from the theoretical value due to its poor surface reaction kinetics and high density of surface trapping states. To solve these drawbacks, a photoanode consisting of NiO nanoparticles anchored on a gradient phosphorus‐doped α‐Fe2O3 nanorod (NR) array (NiO/P‐α‐Fe2O3) was fabricated to achieve optimal light absorption and charge separation, as well as rapid surface reaction kinetics. Specifically, a photoanode with the NR array structure allowed a high mass‐transport rate to be achieved, while phosphorus doping effectively decreased the number of surface trapping sites and improved the electrical conductivity of α‐Fe2O3. Furthermore, the p–n junction that forms between NiO and P‐α‐Fe2O3 can further improve the PEC performance due to efficient hole extraction and the water oxidization catalytic activity of NiO. Consequently, the NiO/P‐α‐Fe2O3 NR photoanode produced a high photocurrent density of 2.08 mA cm−2 at 1.23 V versus a reversible hydrogen electrode and a 110 mV cathodic shift of the onset potential. This rational design of structure offers a new perspective in exploring high‐performance PEC photoanodes.

中文翻译:

磷掺杂的α-Fe2O3纳米阵列上锚固的NiO纳米颗粒:用于水氧化的高效空穴萃取p–n异质结光电阳极

基于赤铁矿的光阳极的光电化学(PEC)水分解效率由于其较差的表面反应动力学和较高的表面俘获态密度而仍远未达到理论值。为了解决这些缺点,由氧化镍的光电阳极纳米颗粒锚固在梯度磷掺杂的α-Fe 2 ö 3纳米棒(NR)阵列(的NiO / P-的α-Fe 2 ö 3)制作以实现最佳的光吸收和电荷分离,以及快速的表面反应动力学。具体而言,与NR阵列结构的光电阳极允许达到高的传质速率,而磷掺杂有效地降低表面捕集位点的数目和改善的导电率的α-Fe 2O 3。此外,p-n结的是NiO和P-的α-Fe之间形成2 ö 3,能够进一步提高性能PEC由于有效的空穴提取和NiO的水氧化催化活性。因此,氧化镍/ P-的α-Fe 2 ö 3 NR光电阳极产生的2.08毫安cm的高光电流密度-2在的1.23V相对于可逆氢电极和开始电位的110毫伏阴极移。这种合理的结构设计为探索高性能PEC光阳极提供了新的视角。
更新日期:2018-06-13
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