Xu Peimin, Wu Dongqing, Wan Li, Hu Pengfei, Liu Ruili
Department of Chemical Engineering, School of Environment and Chemical Engineering, Shanghai University, Shangda Road 99, 200444 Shanghai, PR China.
School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Dongchuan Road 800, 200240 Shanghai, PR China.
J Colloid Interface Sci. 2014 May 1;421:160-4. doi: 10.1016/j.jcis.2014.02.001. Epub 2014 Feb 8.
The high cost of platinum (Pt) based catalysts for oxygen reduction reaction (ORR) has restricted the widespread commercialization of fuel cells. Heteroatom (N, B, P, S or Se) doped carbon materials have been regarded as the promising metal-free catalysts for replacing Pt based catalysts owing to their high efficiencies, good stability and relative low cost. In this work, we present a cost-effective synthesis approach for heteroatom (N and S) doped mesoporous carbon/graphene (HMCG) nanosheets by using nano-casting technology with mesoporous silica/graphene nanosheets (MSG) as hard templates, and four different amino acids (alanine, serine, arginine and cystine) as heteroatom (N, S) and carbon precursors. The resulting catalysts exhibited excellent electrocatalytic activity for ORR in alkaline media. In particular, HMCGAla with alanine as precursors showed the highest electron transfer numbers and durability. These results indicated the attractive potential of HMCGs as metal-free catalysts in practical fuel cells.
用于氧还原反应（ORR）的铂（Pt）基催化剂的高成本限制了燃料电池的广泛商业化。杂原子（N、B、P、S或Se）掺杂的碳材料因其高效率、良好的稳定性和相对较低的成本，被视为有望替代Pt基催化剂的无金属催化剂。在这项工作中，我们提出了一种具有成本效益的合成方法，以介孔二氧化硅/石墨烯纳米片（MSG）作为硬模板，使用纳米铸造技术，以四种不同的氨基酸（丙氨酸、丝氨酸、精氨酸和胱氨酸）作为杂原子（N、S）和碳前驱体，合成杂原子（N和S）掺杂的介孔碳/石墨烯（HMCG）纳米片。所得催化剂在碱性介质中对ORR表现出优异的电催化活性。特别是，以前体丙氨酸制备的HMCGAla表现出最高的电子转移数和耐久性。这些结果表明HMCG作为实用燃料电池中的无金属催化剂具有诱人的潜力。
