From Food Waste to Efficient Bifunctional Nonprecious Electrocatalyst.
From Food Waste to Efficient Bifunctional Nonprecious Electrocatalyst.
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DOI：
10.1002/chem.201704041
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发表时间：
2017-11
期刊：
影响因子：
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通讯作者：
F. Hof;Alessandro Boni;Giovanni Valenti;Kai Huang;F. Paolucci;A. Pénicaud
中科院分区：
文献类型：
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作者：
F. Hof;Alessandro Boni;Giovanni Valenti;Kai Huang;F. Paolucci;A. Pénicaud
石墨纳米碳，可从食物垃圾通过生物甲烷裂解，和氧化铁纳米粒子之间的协同作用提供了有效的双功能电催化剂的访问。钾插层石墨纳米碳的溶解产生具有校准的、小的横向尺寸减小的石墨烯的石墨烯化物溶液，其随后用作铁金属盐的还原剂。这导致小尺寸（2-5 nm）纳米颗粒在复合材料内均匀地在碳骨架上的强结合、催化中心的可接近性和由下面的碳骨架提供的良好导电性。氧化铁纳米碳电催化剂的性能突出表现为达到氧还原反应的基准阈值10 mA cm-2所需的约1 V的总过电位和对析氧反应的特定活性（在10 mA cm-2下η = 0.4 V），与珍贵的RuO 2和IrO 2催化剂相当。这种氧化铁/纳米碳电催化剂是通用的，非常活跃，稳定，真正可持续的。
Synergy between graphitic nanocarbon, obtainable from food waste through cracking of biomethane, and iron oxide nanoparticles provides access to efficient bifunctional electro catalysts. Dissolution of potassium-intercalated graphitic nanocarbons yields graphenide solutions with calibrated, small lateral size-reduced graphenes that are used subsequently as reducing agents of iron metal salts. This results in the strong binding of small size (2-5 nm) nanoparticles on the carbon framework homogeneously within the composite material, accessibility of the catalytic centers, and good conductivity provided by the underlying carbon framework. The iron oxide nanocarbon electrocatalyst performances are highlighted by the overall overpotential of approximately 1 V needed to reach the benchmark threshold of 10 mA cm-2 for the oxygen reduction reaction and the particular activity towards oxygen evolution reaction (η≈0.4 V at 10 mA cm-2 ), comparable to that of the precious RuO2 and IrO2 catalysts. This iron oxide/nanocarbon electrocatalyst is versatile, remarkably active, stable, and truly sustainable.