过电位
析氧
材料科学
纳米笼
电催化剂
催化作用
太阳能燃料
太阳能
摩尔吸收率
石墨烯
纳米技术
光电子学
光化学
化学工程
化学
电化学
光催化
光学
物理化学
物理
电极
工程类
生物化学
生物
生态学
作者
Dehui Deng,Mingxia Xu,Qiming Bing,Yunchuan Tu,Yunlong Zhang,Mo Zhang,Yafeng Cai,Jinlei Li,Xianguang Meng,Jia Zhu,Liang Yu
标识
DOI:10.1002/anie.202412049
摘要
Enabling high‐efficiency solar thermal conversion (STC) at catalytic active site is critical but challenging for harnessing solar energy to boost catalytic reactions. Herein, we report the direct integration of full‐spectrum STC and high electrocatalytic oxygen evolution activity by fabricating a hierarchical nanocage architecture composed of graphene‐encapsulated CoNi nanoparticle. This catalyst exhibits a near‐complete 98% absorptivity of solar spectrum and a high STC efficiency of 97%, which is superior than previous solar thermal catalytic materials. It delivers a remarkable potential decrease of over 240 mV at various current densities for electrocatalytic oxygen evolution under solar illumination, which is practically unachievable via traditionally heating the system. The high‐efficiency STC is enabled by a synergy between the regulated electronic structure of graphene via CoNi‐carbon interaction and the multiple absorption of lights by the light‐trapping nanocage. Theoretical calculations suggest that high temperature‐induced vibrational free energy gain promotes the potential‐limiting O* to OOH* step, which decreases the overpotential for oxygen evolution.
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