Zhao Ya-Nan, Liu Changhai, Xu Siqi, Min Shengkang, Wang Wenchang, Mitsuzaki Naotoshi, Chen Zhidong
School of Materials Science and Engineering, CNPC-CZU Innovation Alliance, Changzhou University, Changzhou 213164, Jiangsu, China.
School of Petrochemical Engineering, Changzhou University, Changzhou 213164, Jiangsu, China.
Inorg Chem. 2023 Aug 7;62(31):12590-12599. doi: 10.1021/acs.inorgchem.3c01965. Epub 2023 Jul 22.
In this paper, PrSrCoRuO perovskite oxides were synthesized by the sol-gel method as bifunctional catalysts for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). The overpotentials of PSCR0.05 against HER and OER at 10 mA cm were 319 and 321 mV in alkaline medium, respectively. The Tafel slopes of HER and OER were 87.32 and 118.1 mV/dec, respectively. PSCR0.05 showed the largest electrochemical active area, the smallest charge transfer resistance, and excellent long-term durability. Meanwhile, the PSCR0.05 electrocatalyst was applied for overall water splitting and its cell voltage was maintained at 1.77 V at 10 mA cm. The super-exchange interaction between adjacent RuO-CoO octahedra in perovskite made of PSCR0.05 contains sufficient active sites (such as Co/Co, Ru/Ru, and O/O). The increase of surface oxygen vacancy and active site is the main reason for the improvement of difunctional catalyst performance. In this work, the electrocatalytic performance of perovskite-type oxides was further optimized by the method of A- and B-site cationic doping regulation, which provides a new idea for perovskite-type bifunctional electrocatalysts.
在本文中，采用溶胶-凝胶法合成了PrSrCoRuO钙钛矿氧化物作为析氢反应（HER）和析氧反应（OER）的双功能催化剂。在碱性介质中，PSCR0.05在10 mA cm下对HER和OER的过电位分别为319和321 mV。HER和OER的塔菲尔斜率分别为87.32和118.1 mV/dec。PSCR0.05表现出最大的电化学活性面积、最小的电荷转移电阻和优异的长期耐久性。同时，将PSCR0.05电催化剂应用于全水分解，其电池电压在10 mA cm下保持在1.77 V。由PSCR0.05制成的钙钛矿中相邻RuO-CoO八面体之间的超交换相互作用包含足够的活性位点（如Co/Co、Ru/Ru和O/O）。表面氧空位和活性位点的增加是双功能催化剂性能提高的主要原因。在这项工作中，通过A位和B位阳离子掺杂调控的方法进一步优化了钙钛矿型氧化物的电催化性能，为钙钛矿型双功能电催化剂提供了新思路。
