Structure–Property Relationship of Bifunctional MnO2 Nanostructures: Highly Efficient, Ultra-Stable Electrochemical Water Oxidation and Oxygen Reduction Reaction Catalysts Identified in Alkaline Media

化学 析氧 双功能 电化学 催化作用 氧化还原 氧气 纳米结构 无机化学 化学工程 氧还原反应 氧还原 还原(数学) 物理化学 电极 有机化学 几何学 工程类 数学
作者
Yongtao Meng,Wenqiao Song,Hui Huang,Zheng Ren,Sheng-Yu Chen,Steven L. Suib
出处
期刊:Journal of the American Chemical Society [American Chemical Society]
卷期号:136 (32): 11452-11464 被引量:991
标识
DOI:10.1021/ja505186m
摘要

Manganese oxides of various structures (α-, β-, and δ-MnO2 and amorphous) were synthesized by facile methods. The electrocatalytic properties of these materials were systematically investigated for catalyzing both oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) in alkaline media. Extensive characterization was correlated with the activity study by investigating the crystal structures (XRD, HRTEM), morphologies (SEM), porosities (BET), surfaces (XPS, O2-TPD/MS), and electrochemical properties (Tafel analysis, Koutechy-Levich plots, and constant-current electrolysis). These combined results show that the electrocatalytic activities are strongly dependent on the crystallographic structures, and follow an order of α-MnO2 > AMO > β-MnO2 > δ-MnO2. Both OER studies and ORR studies reveal similar structure-determined activity trends in alkaline media. In the OER studies, α-MnO2 displays an overpotential of 490 mV compared to 380 mV shown by an Ir/C catalyst in reaching 10 mA cm(-2). Meanwhile, α-MnO2 also exhibits stability for 3 h when supplying a constant current density of 5 mA cm(-2). This was further improved by adding Ni(2+) dopants (ca. 8 h). The superior OER activity was attributed to several factors, including abundant di-μ-oxo bridges existing in α-MnO2 as the protonation sites, analogous to the OEC in PS-II of the natural water oxidation system; the mixed valencies (AOS = 3.7); and the lowest charge transfer resistances (91.8 Ω, η = 430 mV) as revealed from in situ electrochemical impedance spectroscopy (EIS). In the ORR studies, when reaching 3 mA cm(-2), α-MnO2 shows 760 mV close to 860 mV for the best ORR catalyst (20% Pt/C). The outstanding ORR activity was due to the strongest O2 adsorption capability of α-MnO2 suggested by temperature-programmed desorption. As a result, this discovery of the structure-related electrocatalytic activities could provide guidance in the further development of easily prepared, scalable, and low-cost catalysts based on metal oxides and their derivatives.
最长约 10秒,即可获得该文献文件

科研通智能强力驱动
Strongly Powered by AbleSci AI
更新
PDF的下载单位、IP信息已删除 (2025-6-4)

科研通是完全免费的文献互助平台,具备全网最快的应助速度,最高的求助完成率。 对每一个文献求助,科研通都将尽心尽力,给求助人一个满意的交代。
实时播报
英姑应助九思采纳,获得10
刚刚
1秒前
1秒前
1秒前
2秒前
量子星尘发布了新的文献求助10
3秒前
JamesPei应助机灵的囧采纳,获得10
4秒前
llll发布了新的文献求助10
4秒前
orixero应助xmh采纳,获得10
4秒前
wq1020发布了新的文献求助10
6秒前
7秒前
皮皮蛙完成签到,获得积分10
7秒前
情怀应助常芹采纳,获得10
8秒前
肖肖发布了新的文献求助10
8秒前
8秒前
8秒前
9秒前
缥缈问柳完成签到,获得积分10
9秒前
9秒前
明理念桃完成签到,获得积分10
10秒前
13333发布了新的文献求助10
11秒前
Ava应助不吃意面的老番茄采纳,获得10
13秒前
13秒前
zhao完成签到 ,获得积分10
15秒前
16秒前
16秒前
16秒前
xmh完成签到,获得积分10
17秒前
什么也难不倒我完成签到 ,获得积分10
17秒前
18秒前
孟一发布了新的文献求助30
18秒前
19秒前
小幻完成签到,获得积分10
19秒前
好宝宝发布了新的文献求助10
20秒前
20秒前
乐天完成签到,获得积分10
21秒前
wuniuniu发布了新的文献求助10
21秒前
Happyness应助13333采纳,获得30
22秒前
22秒前
刻苦的书竹完成签到,获得积分20
22秒前
高分求助中
A new approach to the extrapolation of accelerated life test data 1000
ACSM’s Guidelines for Exercise Testing and Prescription, 12th edition 500
‘Unruly’ Children: Historical Fieldnotes and Learning Morality in a Taiwan Village (New Departures in Anthropology) 400
Indomethacinのヒトにおける経皮吸収 400
Phylogenetic study of the order Polydesmida (Myriapoda: Diplopoda) 370
基于可调谐半导体激光吸收光谱技术泄漏气体检测系统的研究 350
Robot-supported joining of reinforcement textiles with one-sided sewing heads 320
热门求助领域 (近24小时)
化学 材料科学 医学 生物 工程类 有机化学 生物化学 物理 内科学 纳米技术 计算机科学 化学工程 复合材料 遗传学 基因 物理化学 催化作用 冶金 细胞生物学 免疫学
热门帖子
关注 科研通微信公众号,转发送积分 3988838
求助须知:如何正确求助?哪些是违规求助? 3531250
关于积分的说明 11252914
捐赠科研通 3269838
什么是DOI,文献DOI怎么找? 1804820
邀请新用户注册赠送积分活动 881943
科研通“疑难数据库(出版商)”最低求助积分说明 809028