当前位置: X-MOL 学术ACS Catal. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Reducible Co3+–O Sites of Co–Ni–P–Ox on CeO2 Nanorods Boost Acidic Water Oxidation via Interfacial Charge Transfer-Promoted Surface Reconstruction
ACS Catalysis ( IF 11.3 ) Pub Date : 2023-03-30 , DOI: 10.1021/acscatal.2c06133
Jianyun Liu 1 , Tanyuan Wang 1 , Xuan Liu 1 , Hao Shi 1 , Shenzhou Li 1 , Linfeng Xie 1 , Zhao Cai 2 , Jiantao Han 1 , Yunhui Huang 1 , Guoxiong Wang 3 , Qing Li 1
Affiliation  

Developing efficient and durable earth-abundant electrocatalysts for the acidic oxygen evolution reaction (OER) is the bottleneck for water splitting using proton-exchange membrane electrolyzers. Herein, a heterostructured CeO2 nanorod-supported Co–Ni–P oxide (CeO2/Co-Ni–P–Ox) catalyst is prepared for acidic OER electrocatalysis and the valence states of Co is precisely tuned from 2 to 2.51 by introducing heterojunction interfaces and trace P atoms. The increased Co states favor the in situ transformation of surface Co2+–O sites into highly active reducible Co3+–O sites, which promotes the deprotonation of water molecules and accelerates the OER kinetics. Therefore, this catalyst exhibits extraordinarily low OER overpotentials of 166 and 262 mV at 5 and 10 mA cm–2, respectively, in 0.5 M H2SO4, which are among the best reported for precious-metal-free electrocatalysts so far. The stability of the catalyst is also greatly improved due to the increased vacancy formation energy of the Co site that restricts its dissolution in an acid.

中文翻译:

CeO2 纳米棒上 Co-Ni-P-Ox 的可还原 Co3+-O 位点通过界面电荷转移促进的表面重建促进酸性水氧化

为酸性析氧反应 (OER) 开发高效耐用的地球资源丰富的电催化剂是使用质子交换膜电解槽分解水的瓶颈。在此,制备了用于酸性 OER 电催化的异质结构 CeO 2纳米棒负载的 Co-Ni-P 氧化物 (CeO 2 /Co-Ni-P-O x ) 催化剂,通过引入 Co 的价态从 2 精确调整到 2.51异质结界面和微量 P 原子。增加的 Co 状态有利于表面 Co​​ 2+ –O 位点原位转化为高活性可还原 Co 3+–O位点,促进水分子的去质子化并加速OER动力学。因此,该催化剂在 0.5 MH 2 SO 4中在 5 和 10 mA cm –2下分别表现出 166 和 262 mV 的极低 OER 过电势,这是迄今为止报道的无贵金属电催化剂中最好的。由于 Co 位点的空位形成能增加限制了它在酸中的溶解,催化剂的稳定性也大大提高。
更新日期:2023-03-30
down
wechat
bug