Cobalt Nanocrystals Encapsulated in Heteroatom‐Rich Porous Carbons Derived from Conjugated Microporous Polymers for Efficient Electrocatalytic Hydrogen Evolution,Small

当前位置： X-MOL 学术 › Small › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

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

点击分享查看原文

点击收藏

公开下载

阅读更多本刊最新论文本刊介绍/投稿指南11