Utilizing the Space-Charge Region of the FeNi-LDH/CoP p-n Junction to Promote Performance in Oxygen Evolution Electrocatalysis
Utilizing the Space-Charge Region of the FeNi-LDH/CoP p-n Junction to Promote Performance in Oxygen Evolution Electrocatalysis
复制标题
利用 FeNi-LDH/CoP p-n 结的空间电荷区域提高析氧电催化性能
DOI：
10.1002/anie.201905281
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发表时间：
2019-08-19
影响因子：
16.6
通讯作者：
Qian, Xuefeng
中科院分区：
文献类型：
--
作者：
He, Kai;Tsega, Tsegaye Tadesse;Qian, Xuefeng
电子密度的调制是高效替代电催化剂的有效选择。在此，p-n结在3D自支撑FeNi-LDH/CoP/碳布（CC）电极（LDH=层状双氢氧化物）中构建。在空间电荷区带正电荷的FeNi-LDH能显著促进析氧反应。因此，FeNi-LDH/CoP/CC在1.485V（vs. RHE）下的j达到约1.000。10-fold和ca. 100-分别与FeNi-LDH/CC和CoP/CC相比增加了一倍。密度泛函理论计算表明，OH-在p-n结中吸附在FeNi-LDH侧表面的趋势比单个FeNi-LDH更强，进一步验证了p-n结中的协同效应。此外，它表现出对水分解的优异活性。异质结的利用将为有目的地调控活性中心的电子结构和提高其催化活性开辟一个全新的可能性。
The modulation of electron density is an effective option for efficient alternative electrocatalysts. Here, p-n junctions are constructed in 3D free-standing FeNi-LDH/CoP/carbon cloth (CC) electrode (LDH=layered double hydroxide). The positively charged FeNi-LDH in the space-charge region can significantly boost oxygen evolution reaction. Therefore, the j at 1.485 V (vs. RHE) of FeNi-LDH/CoP/CC achieves ca. 10-fold and ca. 100-fold increases compared to those of FeNi-LDH/CC and CoP/CC, respectively. Density functional theory calculation reveals OH- has a stronger trend to adsorb on the surface of FeNi-LDH side in the p-n junction compared to individual FeNi-LDH further verifying the synergistic effect in the p-n junction. Additionally, it represents excellent activity toward water splitting. The utilization of heterojunctions would open up an entirely new possibility to purposefully regulate the electronic structure of active sites and promote their catalytic activities.