Boosting electrocatalysis by heteroatom doping and oxygen vacancies in hierarchical Ni-Co based nitride phosphide hybrid
Boosting electrocatalysis by heteroatom doping and oxygen vacancies in hierarchical Ni-Co based nitride phosphide hybrid
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通过杂原子掺杂和氧空位促进分级 Ni-Co 基氮化物磷化物杂化物的电催化
DOI：
10.1016/j.jpowsour.2019.03.036
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发表时间：
2019-05
影响因子：
9.2
通讯作者：
Wang Qin
中科院分区：
文献类型：
--
作者：
Shao Zhiyu;Sun Jing;Guo Niankun;He Feng;Huang Keke;Tian Fuli;Wang Qin
近年来，设计用于析氧反应的高活性和低成本电催化剂引起了人们的广泛兴趣。因此，这些催化剂的合理设计是一个必须解决的紧迫课题。在此，一种有效的策略被证明有利于形成具有丰富氧空位的分级氮化物磷化物杂化物。这种混合催化剂表现出优异的OER催化性能，在1.0M KOH溶液中，41 mV·dec−1的超低塔菲尔斜率和10 mA cm−2下290 mV的过电位，优于纯氮化物、磷化物和商业IrO2催化剂。优异的催化性能归因于特定的异质结结构、可接近的活性位点和丰富的氧空位，可以促进电荷传输和O2气泡的释放。这项研究不仅提供了一种在磷化物/氮化物杂化物上构建表面氧空位的简便策略，而且还深入了解了具有多个活性位点的分级电催化剂的性质
Designing highly active and low-cost electrocatalysts towards oxygen evolution reaction has ignited much interest in recent years. Thereby, rational design of those catalysts is an urgent topic that must be addressed. Herein, an effective strategy is demonstrated to be beneficial to the formation of hierarchical nitride phosphide hybrid with abundant oxygen vacancies. This hybrid catalyst exhibits an excellent OER catalytic performance, as demonstrated by an ultralow Tafel slope of 41 mV·dec−1 and an overpotential of 290 mV at 10 mA cm−2 in 1.0M KOH solution, which is superior to those of the pure nitride, phosphide, and the commercial IrO2 catalysts. The outstanding catalytic performance can be attributed to the specific heterojunction structure, accessible active sites, and abundant oxygen vacancies, which can facilitate the charge transport and the release of the O2 bubbles. This study not only provides a facile strategy for constructing surface oxygen vacancies onto phosphide/nitride hybrid, but also exhibits an insight into the nature of hierarchical electrocatalyst with multiple active sites
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