面式、经式异构体的钴-氨基硫脲配合物作为催化剂应用于可见光催化分解水产氢

引用本文: 赵阳, 王永恒, 吴荞宇, 林金清, 吴升晖, 侯文娟, 巫瑞波, 骆耿耿. 面式、经式异构体的钴-氨基硫脲配合物作为催化剂应用于可见光催化分解水产氢[J]. 催化学报, 2018, 39(3): 517-526. doi: 10.1016/S1872-2067(17)62940-1 shu

Citation: Yang Zhao, Yongheng Wang, Qiaoyu Wu, Jinqing Lin, Shenghui Wu, Wenjuan Hou, Ruibo Wu, Genggeng Luo. New tricks for an old dog:Visible light-driven hydrogen production from water catalyzed by fac-and mer-geometrical isomers of tris(thiosemicarbazide) cobalt(III)[J]. Chinese Journal of Catalysis, 2018, 39(3): 517-526. doi: 10.1016/S1872-2067(17)62940-1 shu

面式、经式异构体的钴-氨基硫脲配合物作为催化剂应用于可见光催化分解水产氢

赵阳 ^a, ,
王永恒 ^c, ,
吴荞宇 ^a, ,
林金清 ^a, ,
吴升晖 ^a, ,
侯文娟 ^b, ,
巫瑞波 ^c, ,
骆耿耿 ^a,

a 华侨大学材料科学与工程学院, 福建厦门 361021;
b 华侨大学分析测试中心, 福建厦门 361021;
c 中山大学药学院, 广东广州 510006
基金项目:
国家自然科学基金（21641011，21773313）；福建省自然科学基金（2015J01053，2016J01060）；福建省高校新世纪优秀人才项目；华侨大学研究生科研创新能力培育计划资助项目.

摘要: 近年来，作为替代贵金属铂催化剂的铁、钴和镍等非贵金属配合物分子催化剂，由于合成容易、结构调控方便以及具有良好的催化活性等特点，成为均相光催化分解水产氢领域的研究热点.其中，钴配合物具有结构简单、成本低廉、容易合成以及具有理想的氧化还原电位等优势，更是光催化分解水产氢领域的优先研究对象.由于稳定性及溶解度的问题，在已报道的研究工作中，大部分钴配合物测试环境均在有机溶剂或有机溶剂/水混合溶剂中.因此，寻找水溶性良好的钴配合物催化剂成为了目前的均相光催化分解水产氢领域的研究焦点之一.在此之前，氨基硫脲配合物已经广泛用于生物和制药等研究，例如：抗氧化、抗菌以及抗病毒等领域.而在人工光合产氢领域采用氨基硫脲配合物作为催化剂的例子则比较罕见.在该项研究中，我们报道了一对水溶性较好（>40mg mL^-1，20℃）且具有几何异构特征的八面体钴-氨基硫脲配合物作为光、电催化质子还原产氢的分子催化剂.这对几何异构体分别为：面式异构体[Co（Htsc）₃]Cl₃·3H₂O（C1，Htsc=氨基硫脲配体）和经式异构体[Co（Htsc）₃]Cl₃·4H₂O（C2）.我们将几何异构体C1和C2作为水还原分子催化剂，与有机光敏剂荧光素一起构筑了不含贵金属成分的光催化分解水产氢体系.在三乙胺作为牺牲剂及纯水环境中，体系展现出了良好的光催化制氢性能.可见光照15 h后，体系产氢相对于催化剂的TON接近900.对比实验结果表明，具有这对几何异构的C1和C2具有相似的光催化产氢性能，暗示其催化机理的相似性.汞中毒实验结果表明，光催化分解水产氢过程中并没有钴纳米胶体形成，可以确定这是一个均相光催化分解水产氢体系.在纯水环境下，我们将C1和C2与传统的钴配合物（钴肟配合物：[Co（dmgH）₂pyCl]（dmgH=丁二酮肟，py=吡啶）；联吡啶钴配合物：[Co（bpy）₃Cl₂]（bpy=2，2'-联吡啶））的催化活性进行对比.结果表明，催化剂C1和C2展现出了较强的光催化产氢活性.此外，电催化实验表明，在乙腈中且乙酸作为质子源的条件下，C1和C2具有相同的电催化活性，过电位接近640毫伏，催化转化频率（TOF）为每秒210.同时，在pH=7的磷酸盐缓冲溶液中，C1和C2也同样表现出对水分子的电催化产氢性能，过电势为560毫伏.
这是当前第一例具有几何异构体的分子催化剂对光、电催化产氢体系影响的工作.

关键词:

English

New tricks for an old dog:Visible light-driven hydrogen production from water catalyzed by fac-and mer-geometrical isomers of tris(thiosemicarbazide) cobalt(III)

a College of Materials Science and Engineering, Huaqiao University, Xiamen 361021, Fujian, China;
b Instrumental Analysis Center, Huaqiao University, Xiamen 361021, Fujian, China;
c School of Pharmaceutical Sciences, East Campus, Sun Yat-sen University, Guangzhou 510006, Guangdon, China
Received Date: 28 September 2017
Revised Date: 19 October 2017
Fund Project:
This work was supported by the National Natural Science Foundation of China (21641011, 21773313), the Natural Science Foundation of Fujian Province (2015J01053, 2016J01060), Program for New Century Excellent Talents in Fujian Province University, and Promotion Program for Young and Middle-aged Teacher in Science, Technology Research of Huaqiao University (ZQN-PY104).

Abstract: Increasing interest has been paid to the development of earth-abundant metal complexes as promising surrogates of platinum for the electrocatalytically and photocatalytically driven hydrogen evolution reaction. In this work, we report on molecular H₂-evolving catalysts based on two octahedral complexes of cobalt thiosemicarbazide, fac-[Co(Htsc)₃]Cl₃·3H₂O (C1, Htsc=thiosemicarbazide) and mer-[Co(Htsc)₃]Cl₃·4H₂O (C2), which have facial (fac) and meridional (mer) geometry, respectively. Electrochemical studies confirmed that both C1 and C2 are active electrocatalysts in MeOH solution using acetic acid as the proton source, with the same overpotential of~640 mV and TOF of~210 s^-1. The complex C1 also exhibits electrocatalytic activity for hydrogen evolution reaction in aqueous media free of organic solvent with a moderate overpotential (560 mV). Visible light-driven hydrogen evolution experiments were carried out in combination with fluorescein as photosensitizer and triethylamine as sacrificial reductant in homogeneous environments. Our studies showed that both C1 and C2 can be used as efficient proton-reduction catalysts in purely aqueous solution and have the same photocatalytic activities. A TOF of 125 h^-1 with a TON of 900 for photocatalytic H₂ generation using C1 and C2 in water were achieved for the noble-metal-free homogeneous system. It should be noted that this is the first reported study investigating the effect on the catalytic hydrogen production performance of using fac-and mer-isomers of molecular catalysts.

Key words:

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沈阳化工大学材料科学与工程学院沈阳 110142

面式、经式异构体的钴-氨基硫脲配合物作为催化剂应用于可见光催化分解水产氢

English

New tricks for an old dog:Visible light-driven hydrogen production from water catalyzed by fac-and mer-geometrical isomers of tris(thiosemicarbazide) cobalt(III)

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通讯作者: 陈斌, bchen63@163.com

中国化学会秘书处

面式、经式异构体的钴-氨基硫脲配合物作为催化剂应用于可见光催化分解水产氢

English

New tricks for an old dog:Visible light-driven hydrogen production from water catalyzed by fac-and mer-geometrical isomers of tris(thiosemicarbazide) cobalt(III)

CCS Chemistry：嵌段共聚物自组装成 “三明治”二维有机材料，实现纳米级压力传感功能

CCS Chemistry：颜徐州、鲍哲南： 你的皮肤可能是一片SPMs

CCS Chemistry：工作高效不疲劳，只须让催化剂动起来

CCS Chemistry：静电组装导向聚合- 聚电解质纳米凝胶量化制备新策略

CCS Chemistry：金黄色葡萄球菌醛基脱氢酶是如何识别特异性底物的？

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通讯作者: 陈斌, bchen63@163.com

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