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Size-controlled, hollow and hierarchically porous Co2Ni2 alloy nanocubes for efficient oxygen reduction in microbial fuel cells
Reaction Chemistry & Engineering ( IF 3.4 ) Pub Date : 2021-11-24 , DOI: 10.1039/d1re00480h Wenyi Wang 1 , Xueqin Wang 1 , Yuanyuan Wang 1 , Bolong Jiang 2 , Hua Song 1
Reaction Chemistry & Engineering ( IF 3.4 ) Pub Date : 2021-11-24 , DOI: 10.1039/d1re00480h Wenyi Wang 1 , Xueqin Wang 1 , Yuanyuan Wang 1 , Bolong Jiang 2 , Hua Song 1
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Uniform, hollow-structure and hierarchically porous materials often exhibit surprisingly outstanding electrocatalytic performance. However, fabrication of highly active and stable non-noble metal-based alloys remains a huge challenge. Herein, a facile synthetic strategy that allows two-step fabrication of size-controllable Co2Ni2 hierarchical alloy nanocubes (HANCs) with a uniform composition and hollow structure is proposed. The as-fabricated Co2Ni2 HANCs exhibit an ultrahigh surface area and a hierarchical porous structure owing to co-reduction deposition of metal particles. The uniform hollow structure is produced by etching with the assistance of weak organic acids to further expand the inner space of the nanocubes. The size of the Co2Ni2 HANCs can be precisely controlled by regulating the added content of the structure-directing modulator urea with positive correlation. The Co2Ni2 HANCs possess a four-pointed star-like interior cavity and a marginal oxide layer with a thickness of 7 nm. Experimental and theoretical studies straightforwardly show that the hierarchically porous hollow Co–Ni alloy can reduce the energy barrier, accelerate the ORR kinetics, and greatly promote the improvement of electrocatalytic activity.
中文翻译：
用于微生物燃料电池中有效氧还原的尺寸控制、中空和分级多孔 Co2Ni2 合金纳米立方体
均匀、中空结构和分级多孔的材料通常表现出令人惊讶的出色电催化性能。然而，制备高活性和稳定的非贵金属基合金仍然是一个巨大的挑战。在此，提出了一种简便的合成策略，该策略允许两步制造具有均匀成分和中空结构的尺寸可控的 Co 2 Ni 2分级合金纳米立方体 (HANC)。制成的 Co 2 Ni 2由于金属颗粒的共还原沉积，HANCs 表现出超高的表面积和分级多孔结构。通过在弱有机酸的辅助下蚀刻以进一步扩大纳米立方体的内部空间来产生均匀的中空结构。Co 2 Ni 2 HANCs的尺寸可以通过调节结构导向调节剂尿素的添加量以正相关来精确控制。Co 2 Ni 2HANCs 具有四角星状内部腔和厚度为 7 nm 的边缘氧化层。实验和理论研究直接表明，分级多孔中空 Co-Ni 合金可以降低能垒，加速 ORR 动力学，极大地促进电催化活性的提高。
更新日期：2021-12-15
中文翻译：
用于微生物燃料电池中有效氧还原的尺寸控制、中空和分级多孔 Co2Ni2 合金纳米立方体
均匀、中空结构和分级多孔的材料通常表现出令人惊讶的出色电催化性能。然而，制备高活性和稳定的非贵金属基合金仍然是一个巨大的挑战。在此，提出了一种简便的合成策略，该策略允许两步制造具有均匀成分和中空结构的尺寸可控的 Co 2 Ni 2分级合金纳米立方体 (HANC)。制成的 Co 2 Ni 2由于金属颗粒的共还原沉积，HANCs 表现出超高的表面积和分级多孔结构。通过在弱有机酸的辅助下蚀刻以进一步扩大纳米立方体的内部空间来产生均匀的中空结构。Co 2 Ni 2 HANCs的尺寸可以通过调节结构导向调节剂尿素的添加量以正相关来精确控制。Co 2 Ni 2HANCs 具有四角星状内部腔和厚度为 7 nm 的边缘氧化层。实验和理论研究直接表明，分级多孔中空 Co-Ni 合金可以降低能垒，加速 ORR 动力学，极大地促进电催化活性的提高。
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