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Cobalt Nanocrystals Encapsulated in Heteroatom‐Rich Porous Carbons Derived from Conjugated Microporous Polymers for Efficient Electrocatalytic Hydrogen Evolution
Small ( IF 13.0 ) Pub Date : 2018-09-18 , DOI: 10.1002/smll.201803232
Haige Wang 1 , Bo Hou 2 , Yang Yang 3 , Qianwang Chen 3 , Meifang Zhu 1 , Arne Thomas 4 , Yaozu Liao 1
Affiliation  

Cobalt nanocrystals encapsulated in N,O‐dual‐doped porous carbons as efficient and stable electrocatalysts for hydrogen evolution reaction (HER) are reported. A heteroatom‐rich‐conjugated microporous polymer is first chemically deposited on a carbon fiber cloth, and after addition of a cobalt salt, pyrolyzed to produce a heteroatom‐doped C/Co nanocrystal composite. With this process, the use of additional binders for preparation of electrodes can be avoided. With a trace cobalt loading (0.46 wt%), the electrodes achieve a low Tafel slope of 46 mV dec−1 and overpotential of only 69 mV at a current density of 10 mA cm−2 in 0.5 m H2SO4. Experimental and computational studies reveal that the superior HER behavior is due to a decreased free energy of hydrogen adsorption, induced by i) electrons transferred from the cobalt nanocrystals to graphite layers and ii) N,O‐dual doping reduced the Fermi level of neighboring C atoms.

中文翻译:

钴纳米晶包裹在杂原子丰富的多孔碳中,这些碳是由共轭微孔聚合物衍生而来的,可以有效地产生电催化氢

据报道,钴纳米晶体封装在N,O-双掺杂多孔碳中,作为氢析出反应(HER)的有效和稳定的电催化剂。首先,将富含杂原子的共轭微孔聚合物化学沉积在碳纤维布上,然后添加钴盐后进行热解,以制得杂原子掺杂的C / Co纳米晶体复合材料。通过这种方法,可以避免使用额外的粘合剂来制备电极。在痕量钴负载(0.46 wt%)的情况下,电极在0.5 m H 2 SO 4中的电流密度为10 mA cm -2时实现46 mV dec -1的低Tafel斜率和仅69 mV的过电势。实验和计算研究表明,优异的HER行为是由于i)从钴纳米晶体转移到石墨层的电子和ii)N,O-双掺杂降低了相邻C的费米能级引起的,氢吸附的自由能降低。原子。
更新日期:2018-09-18
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