Mo(6+) activated multimetal oxygen-evolving catalysts.
Mo(6+) activated multimetal oxygen-evolving catalysts.
复制标题
Mo6活化多金属析氧催化剂
DOI：
10.1039/c6sc04819f
复制
发表时间：
2017-05-01
期刊：
影响因子：
8.4
通讯作者：
Yang HG
中科院分区：
文献类型：
--
作者：
Liu PF;Yang S;Zheng LR;Zhang B;Yang HG
非晶态多金属FeCoMo OER催化剂已成功地合成，由高价Mo 6+激活，证明上级性能优于基准IrO 2。水分解是电驱动化学燃料合成的关键，但析氧反应（OER）的缓慢动力学阻碍了这种技术的更广泛推广。已经为OER开发了几种第一行（3d）过渡金属基催化剂;然而，这些催化剂仍然需要远高于基本热力学势的操作电压。在这里，我们报告高价金属钼（Mo 6+）调制的3d金属（氧）氢氧化物。所获得的多金属FeCoMo基OER催化剂需要277 mV的过电位以在玻璃碳电极上达到10 mA cm-2的电流密度，并且在约40小时的稳定性测试中没有降解的迹象。催化剂保持在它们的非晶相，潜在地具有原子均匀的金属分布。原位X射线吸附分析明确地揭示了由于Mo 6+而引起的3d金属的调谐电子结构，进一步证明了高价金属对设计高效OER催化剂的改性作用。
An amorphous multimetal FeCoMo OER catalyst has been successfully synthesized, activated by high-valence Mo6+, evidencing superior performance over benchmarking IrO2. Water splitting is key to electrically-powered chemical fuel synthesis, but the slow kinetics of the oxygen evolution reaction (OER) hinder the wider promotion of such technology. Several first-row (3d) transition metal-based catalysts have been developed for the OER; however, these catalysts still require operating voltages that lie well above the fundamental thermodynamic potential. Here, we report high-valence metal molybdenum (Mo6+) modulated 3d metal (oxy)hydroxides. The obtained multimetal FeCoMo based OER catalysts require an overpotential of 277 mV to reach the current density of 10 mA cm–2 on the glassy carbon electrode, and there was no evidence of degradation for about 40 hours of stability testing. The catalysts stay in their amorphous phases, potentially with atomically homogenous metal distribution. The in situ X-ray adsorption analysis unambiguously reveals the tuned electronic structures of the 3d metals owing to Mo6+, further demonstrating the modification effect of a high-valence metal for designing highly-efficient OER catalysts.