Thin film catalysts: Ni5P4 (Cathodic) and LiCoO2 (Anodic) for electrolysis of water
Thin film catalysts: Ni5P4 (Cathodic) and LiCoO2 (Anodic) for electrolysis of water
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DOI：
10.1149/07223.0031ecst
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发表时间：
2016-08
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影响因子：
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通讯作者：
Shinjae Hwang;S. Porter;Graeme Gardner;A. B. Laursen;Hao Wang;Mengjun Li;V. Amarasinghe;E. Taghaddos;A. Safari;E. Garfunkel;M. Greenblatt;G. Dismukes
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文献类型：
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作者：
Shinjae Hwang;S. Porter;Graeme Gardner;A. B. Laursen;Hao Wang;Mengjun Li;V. Amarasinghe;E. Taghaddos;A. Safari;E. Garfunkel;M. Greenblatt;G. Dismukes
为了加速电解水的氧化半反应和还原半反应，需要廉价且富含稀土的催化剂。以天然酶为模型，如光系统II水氧化配合物中的CaMn4O5立方基序和Ni-Fe氢化酶的Ni-S活性位点，我们之前分别开发了模拟其化学性质的立方LiCoO2和磷化镍。本文制备了尖晶石- LiCo2O4薄膜，用于（水氧化）析氧反应（OER）， Ni5P4薄膜，用于Au衬底上的析氢反应（HER）。我们研究了它们的原子结构（PXRD）、拉曼振动模式、表面形貌（SEM、AFM）、核心电子能级（XPS）和电化学催化性能。这些非贵金属薄膜材料的功能与单个纳米晶体颗粒一样好，有望应用于单片光电化学电池和潜在的燃料电池。
Inexpensive earth-abundant catalysts are required to accelerate both the oxidative and reductive half reactions for electrolysis of water. Using natural enzymes as models, such as the CaMn4O5 cubane motif in the water oxidizing complex of photosystem II and the Ni-S active site of Ni-Fe hydrogenase, we previously developed cubic LiCoO2 and nickel phosphides that mimic their chemistry, respectively. Here we prepared thin films of spinel – LiCo2O4, for the (water oxidation) oxygen evolving reaction (OER), and Ni5P4, for the hydrogen evolving reaction (HER) on Au substrates. We investigated their atomic structure (PXRD), Raman vibrational modes, surface morphology (SEM, AFM), core electronic levels (XPS), and electrochemical catalytic performance. These non-precious metal thin film materials function as well as the individual nanocrystalline particles and are expected to be applicable to use in monolithic photoelectrochemical cells and potentially fuel cells.