Nam Dukhyun, Lee Geunhyeong, Kim Jooheon
School of Chemical Engineering & Materials Science, Chung-Ang University 84 Heukseok-ro, Dongjak-gu Seoul Korea
Department of Advanced Materials Engineering, Chung-Ang University Anseong-si Gyeonggi-do 17546 Republic of Korea.
RSC Adv. 2023 Mar 16;13(13):8873-8881. doi: 10.1039/d2ra08273j. eCollection 2023 Mar 14.
Because of the interactive combination synergy effect, hetero interface engineering is used way for advancing electrocatalytic activity and durability. In this study, we demonstrate that a CeO/BiWO heterostructure is synthesized by a hydrothermal method. Electrochemical measurement results indicate that CeO/BiWO displays not only more OER catalytic active sites with an overpotential of 390 mV and a Tafel slope of 117 mV dec but also durability for 10 h (97.57%). Such outstanding characteristics are primarily attributed to (1) the considerable activities by CeO nanoparticles uniformly distributed on BiWO nanosheets and (2) the plentiful Bi-O-Ce and W-O-Ce species playing the role of strong couples between CeO nanoparticles and BiWO nanosheets and oxygen vacancy existence in CeO nanoparticles, which can improve the electrochemical active surface area (ECSA) and activity, and enhance the conductivity for OERs. This CeO/BiWO consists of the heterojunction engineering that can open a modern method of thinking for high effective OER electrocatalysts.
由于交互组合协同效应，异质界面工程是提高电催化活性和耐久性的有效方法。在本研究中，我们证明了通过水热法合成了CeO/BiWO异质结构。电化学测量结果表明，CeO/BiWO不仅显示出更多的析氧反应（OER）催化活性位点，过电位为390 mV，塔菲尔斜率为117 mV dec，而且具有10小时的耐久性（97.57%）。这些优异的特性主要归因于：（1）均匀分布在BiWO纳米片上的CeO纳米颗粒具有相当高的活性；（2）大量的Bi-O-Ce和W-O-Ce物种在CeO纳米颗粒和BiWO纳米片之间起到强耦合作用，并且CeO纳米颗粒中存在氧空位，这可以提高电化学活性表面积（ECSA）和活性，并增强OER的导电性。这种CeO/BiWO由异质结工程组成，可为高效OER电催化剂开辟一种现代思维方式。
