-60 degrees C solution synthesis of atomically dispersed cobalt electrocatalyst with superior performance
-60℃溶液合成原子分散的钴电催化剂，具有优越的性能
Huang K, Zhang L, Xu T, Wei H, Zhang R, Zhang X, Ge B, Lei M, Ma JY, Liu LM, Wu H
abstract：Temperature can govern morphologies, structures and properties of products from synthesis in solution. A reaction in solution at low temperature may result in different materials than at higher temperature due to thermodynamics and kinetics of nuclei formation. Here, we report a low-temperature solution synthesis of atomically dispersed cobalt in a catalyst with superior performance. By using a water/alcohol mixed solvent with low freezing point, liquid-phase reduction of a cobalt precursor with hydrazine hydrate is realized at -60 degrees C. A higher energy barrier and a sluggish nucleation rate are achieved to suppress nuclei formation; thus atomically dispersed cobalt is successfully obtained in a catalyst for oxygen reduction with electrochemical performance superior to that of a Pt/C catalyst. Furthermore, the atomically dispersed cobalt catalyst is applied in a microbial fuel cell to obtain a high maximum power density (2550 +/- 60 mW m(-2)) and no current drop upon operation for 820 h.
摘要：温度可以控制溶液中合成产物的形态，结构和性质。由于热力学和核形成的动力学，在低温下溶液中的反应可能导致与在较高温度下不同的材料。在这里，我们报道了催化剂中原子分散的钴的低温溶液合成，具有优异的性能。通过使用具有低凝固点的水/醇混合溶剂，在-60℃下实现钴前体与水合肼的液相还原。实现更高的能垒和缓慢的成核速率以抑制核形成;因此，在氧还原催化剂中成功地获得原子分散的钴，其电化学性能优于Pt / C催化剂。此外，将原子分散的钴催化剂应用于微生物燃料电池中以获得高的最大功率密度（2550 +/- 60mW m（-2））并且在操作820小时时没有电流下降。
-60℃溶液合成原子分散的钴电催化剂，具有优越的性能
Huang K, Zhang L, Xu T, Wei H, Zhang R, Zhang X, Ge B, Lei M, Ma JY, Liu LM, Wu H
abstract：Temperature can govern morphologies, structures and properties of products from synthesis in solution. A reaction in solution at low temperature may result in different materials than at higher temperature due to thermodynamics and kinetics of nuclei formation. Here, we report a low-temperature solution synthesis of atomically dispersed cobalt in a catalyst with superior performance. By using a water/alcohol mixed solvent with low freezing point, liquid-phase reduction of a cobalt precursor with hydrazine hydrate is realized at -60 degrees C. A higher energy barrier and a sluggish nucleation rate are achieved to suppress nuclei formation; thus atomically dispersed cobalt is successfully obtained in a catalyst for oxygen reduction with electrochemical performance superior to that of a Pt/C catalyst. Furthermore, the atomically dispersed cobalt catalyst is applied in a microbial fuel cell to obtain a high maximum power density (2550 +/- 60 mW m(-2)) and no current drop upon operation for 820 h.
摘要：温度可以控制溶液中合成产物的形态，结构和性质。由于热力学和核形成的动力学，在低温下溶液中的反应可能导致与在较高温度下不同的材料。在这里，我们报道了催化剂中原子分散的钴的低温溶液合成，具有优异的性能。通过使用具有低凝固点的水/醇混合溶剂，在-60℃下实现钴前体与水合肼的液相还原。实现更高的能垒和缓慢的成核速率以抑制核形成;因此，在氧还原催化剂中成功地获得原子分散的钴，其电化学性能优于Pt / C催化剂。此外，将原子分散的钴催化剂应用于微生物燃料电池中以获得高的最大功率密度（2550 +/- 60mW m（-2））并且在操作820小时时没有电流下降。
