A Universal Strategy to Metal Wavy Nanowires for Efficient Electrochemical Water Splitting at pH‐Universal Conditions
A Universal Strategy to Metal Wavy Nanowires for Efficient Electrochemical Water Splitting at pH‐Universal Conditions
复制标题
DOI：
10.1002/adfm.201803722
复制
发表时间：
2018-08
影响因子：
19
通讯作者：
Jian Yang;Yujin Ji;Qi Shao;N. Zhang;Youyong Li;Xiaoqing Huang
中科院分区：
文献类型：
--
作者：
Jian Yang;Yujin Ji;Qi Shao;N. Zhang;Youyong Li;Xiaoqing Huang
虽然整体水分解被认为是可持续产生氧气和氢气的最有效方法之一，但设计在通用 pH 条件下对整体水分解具有活性和稳定性的强大电催化剂仍然是一个重大挑战。本文报道了一种用于增强电催化作用的一类金属波状纳米线（NW）的通用策略。受益于超薄性质和大量缺陷的结构特征，所获得的纳米线在通用pH条件下的析氧反应（OER）和析氢反应中通常表现出诱人的性能。更重要的是，优化的Ru O2 NWs-Ir NWs电解槽在整体水分解方面表现出优异的性能，在10 mA cm−2下，0.05和0.5 m H2SO4中的电池电压仅为1.50和1.47 V，0.1和1 m KOH中的电池电压为1.56和1.49 V，远低于Ir/C-Pt/C电解槽的电压。第一性原理计算表明，RuO2(200)表面Ru原子点缺陷的出现会降低OER过电势，在此期间，由于d带中心右移，OER中间体的吸附自由能减弱。 RuO2 NWs-Ir NWs电解槽在长期电解中也表现出优异的耐久性，在不同pH电解质中水分解显示出令人兴奋的前景。
While overall water splitting is considered as one of the most efficient approaches for sustainable oxygen and hydrogen generations, the design of robust electrocatalysts that are active and stable for overall water splitting in pH‐universal conditions is still a significant challenge. Herein, a universal strategy for a class of metal wavy nanowires (NWs) for the enhanced electrocatalysis is reported. Benefiting from the structural features of ultrathin nature and numbers of defects, the obtained NWs generally exhibit attractive performances in oxygen evolution reaction (OER) and hydrogen evolution reaction at pH‐universal conditions. More significantly, the optimized Ru O2 NWs‐Ir NWs electrolyzer shows superior performance for overall water splitting with only cell voltages of 1.50 and 1.47 V in 0.05 and 0.5 m H2SO4 and 1.56 and 1.49 V in 0.1and 1 m KOH at 10 mA cm−2, much lower than those of the Ir/C‐Pt/C electrolyzer. First‐principles calculations reveals that the appearance of Ru‐atom point defects on RuO2(200) surface will lower the OER overpotential during which the adsorption free energies of OER intermediates are weakened due to the right‐shift of d‐band center. The RuO2 NWs‐Ir NWs electrolyzer also exhibits excellent durability in long‐term electrolysis, showing exciting prospect for water splitting in different pH electrolytes.