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首页> 外文期刊>RSC Advances >Electrochemical impacts of sheet-like hafnium phosphide and hafnium disulfide catalysts bonded with reduced graphene oxide sheets for bifunctional oxygen reactions in alkaline electrolytes
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Electrochemical impacts of sheet-like hafnium phosphide and hafnium disulfide catalysts bonded with reduced graphene oxide sheets for bifunctional oxygen reactions in alkaline electrolytes

机译：片状磷化and和二硫化ha催化剂与还原性氧化石墨烯片结合后对碱性电解质中双功能氧反应的电化学影响

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Non-noble metal-based catalysts with efficient catalytic activities for the oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) are critical for energy conversion devices, including fuel cells and metal–air batteries. In this work, novel hafnium phosphide-reduced graphene oxide nanosheets (HfP-rGO NS) and hafnium disulfide-reduced graphene oxide nanosheets (HfS _(2) -rGO NS) were synthesized and investigated as bifunctional electrocatalysts for OER and ORR. The prepared HfP-rGO NS and HfS _(2) -rGO NS catalysts showed nanosheet structures, where the HfP or HfS _(2) nanosheet was closely packed with rGO. A unique methodology was adopted to lodge the non-metal oxide catalytic sheets ( i.e. , HfP and HfS _(2) ) over the rGO sheets, which positioned the oxide layer on the catalytic sheet surface for instant oxygen evolution. Low intensity X-ray diffraction patterns and Raman spectra confirmed the sheet-like structure of HfP-rGO NS and HfS _(2) -rGO NS. Scanning electron microscope mapping images revealed that all elements ( i.e. , Hf, P, C and O for HfP-rGO NS and Hf, S, C and O for HfS _(2) -rGO NS) were equally distributed in the synthesized heteroatomic nanosheets. Moreover, both the HfP-rGO NS and HfS _(2) -rGO NS demonstrated excellent durability for both ORR and OER. This outperforms the most state-of-the-art non-precious-metal-based bifunctional catalysts, which is attributed to the synergistic effect of rGO and Hf-based catalysts. The different ORR and OER reaction potentials in HfP-rGO NS and HfS _(2) -rGO NS likely result from the influence of HfP and HfS _(2) .
机译：对氧气释放反应（OER）和氧气还原反应（ORR）具有有效催化活性的非贵金属基催化剂对于包括燃料电池和金属空气电池在内的能量转换装置至关重要。在这项工作中，合成了新颖的磷化ha还原的氧化石墨烯纳米片（HfP-rGO NS）和二硫化dis还原的氧化石墨烯纳米片（HfS _（2）-rGO NS），并作为OER和ORR的双功能电催化剂进行了研究。制备的HfP-rGO NS和H​​fS_（2）-rGO NS催化剂表现出纳米片结构，其中HfP或HfS_（2）纳米片与rGO紧密堆积。采用了一种独特的方法将非金属氧化物催化薄板（即HfP和HfS_（2））放置在rGO薄板上，从而将氧化层放置在催化薄板上以立即释放氧气。低强度X射线衍射图谱和拉曼光谱证实了HfP-rGO NS和H​​fS_（2）-rGO NS的片状结构。扫描电子显微镜作图图像显示，所有元素（即HfP-rGO NS的Hf，P，C和O和HfS _（2）-rGO NS的Hf，S，C和O）均等地分布在合成的杂原子纳米片中。此外，HfP-rGO NS和H​​fS_（2）-rGO NS均显示出对ORR和OER均极好的耐久性。这优于最先进的非贵金属基双功能催化剂，这归因于rGO和Hf基催化剂的协同作用。 HfP-rGO NS和H​​fS _（2）-rGO NS中的ORR和OER反应电位不同可能是由于HfP和HfS _（2）的影响。

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