Works by Sun, Kaian

Results: 30

Photosynthesis of Benzonitriles on BiOBr Nanosheets Promoted by Vacancy Associates.
Published in:
Angewandte Chemie, 2023, v. 135, n. 49, p. 1, doi. 10.1002/ange.202313325
By:
- Han, Tong;
- Cao, Xing;
- Chen, Hsiao‐Chien;
- Ma, Junguo;
- Yu, Yuan;
- Li, Yuhuan;
- Xu, Wei;
- Sun, Kaian;
- Huang, Aijian;
- Chen, Zheng;
- Chen, Chen;
- Zhang, Hongjun;
- Ye, Bangjiao;
- Peng, Qing;
- Li, Yadong
Publication type:
Article
Direct Oxygen‐Oxygen Cleavage through Optimizing Interatomic Distances in Dual Single‐atom Electrocatalysts for Efficient Oxygen Reduction Reaction.
Published in:
Angewandte Chemie, 2023, v. 135, n. 17, p. 1, doi. 10.1002/ange.202301833
By:
- Xie, Yuhan;
- Chen, Xin;
- Sun, Kaian;
- Zhang, Jinqiang;
- Lai, Wei‐Hong;
- Liu, Hao;
- Wang, Guoxiu
Publication type:
Article
Synergistically Interactive Pyridinic‐N–MoP Sites: Identified Active Centers for Enhanced Hydrogen Evolution in Alkaline Solution.
Published in:
Angewandte Chemie, 2020, v. 132, n. 23, p. 9067, doi. 10.1002/ange.201908760
By:
- Zhao, Di;
- Sun, Kaian;
- Cheong, Weng‐Chon;
- Zheng, Lirong;
- Zhang, Chao;
- Liu, Shoujie;
- Cao, Xing;
- Wu, Konglin;
- Pan, Yuan;
- Zhuang, Zewen;
- Hu, Botao;
- Wang, Dingsheng;
- Peng, Qing;
- Chen, Chen;
- Li, Yadong
Publication type:
Article
Direct Microenvironment Modulation of CO2 Electroreduction: Negatively Charged Ag Sites Going beyond Catalytic Surface Reactions.
Published in:
Angewandte Chemie, 2024, v. 136, n. 37, p. 1, doi. 10.1002/ange.202408580
By:
- Dai, Ruoyun;
- Sun, Kaian;
- Shen, Rongan;
- Fang, Jinjie;
- Cheong, Weng‐Chon;
- Zhuang, Zewen;
- Zhuang, Zhongbin;
- Zhang, Chao;
- Chen, Chen
Publication type:
Article
Anti-dissolution Pt single site with Pt(OH)(O3)/Co(P) coordination for efficient alkaline water splitting electrolyzer.
Published in:
Nature Communications, 2022, v. 13, n. 1, p. 1, doi. 10.1038/s41467-022-31406-0
By:
- Zeng, Lingyou;
- Zhao, Zhonglong;
- Lv, Fan;
- Xia, Zhonghong;
- Lu, Shi-Yu;
- Li, Jiong;
- Sun, Kaian;
- Wang, Kai;
- Sun, Yingjun;
- Huang, Qizheng;
- Chen, Yan;
- Zhang, Qinghua;
- Gu, Lin;
- Lu, Gang;
- Guo, Shaojun
Publication type:
Article
Anti-dissolution Pt single site with Pt(OH)(O3)/Co(P) coordination for efficient alkaline water splitting electrolyzer.
Published in:
Nature Communications, 2022, v. 13, n. 1, p. 1, doi. 10.1038/s41467-022-31406-0
By:
- Zeng, Lingyou;
- Zhao, Zhonglong;
- Lv, Fan;
- Xia, Zhonghong;
- Lu, Shi-Yu;
- Li, Jiong;
- Sun, Kaian;
- Wang, Kai;
- Sun, Yingjun;
- Huang, Qizheng;
- Chen, Yan;
- Zhang, Qinghua;
- Gu, Lin;
- Lu, Gang;
- Guo, Shaojun
Publication type:
Article
Author Correction: Anti-dissolution Pt single site with Pt(OH)(O3)/Co(P) coordination for efficient alkaline water splitting electrolyzer.
Published in:
2022
By:
- Zeng, Lingyou;
- Zhao, Zhonglong;
- Lv, Fan;
- Xia, Zhonghong;
- Lu, Shi-Yu;
- Li, Jiong;
- Sun, Kaian;
- Wang, Kai;
- Sun, Yingjun;
- Huang, Qizheng;
- Chen, Yan;
- Zhang, Qinghua;
- Gu, Lin;
- Lu, Gang;
- Guo, Shaojun
Publication type:
Correction Notice
Anti-dissolution Pt single site with Pt(OH)(O3)/Co(P) coordination for efficient alkaline water splitting electrolyzer.
Published in:
Nature Communications, 2022, v. 13, n. 1, p. 1, doi. 10.1038/s41467-022-31406-0
By:
- Zeng, Lingyou;
- Zhao, Zhonglong;
- Lv, Fan;
- Xia, Zhonghong;
- Lu, Shi-Yu;
- Li, Jiong;
- Sun, Kaian;
- Wang, Kai;
- Sun, Yingjun;
- Huang, Qizheng;
- Chen, Yan;
- Zhang, Qinghua;
- Gu, Lin;
- Lu, Gang;
- Guo, Shaojun
Publication type:
Article
Anion-exchange-mediated internal electric field for boosting photogenerated carrier separation and utilization.
Published in:
Nature Communications, 2021, v. 12, n. 1, p. 1, doi. 10.1038/s41467-021-25261-8
By:
- Han, Tong;
- Cao, Xing;
- Sun, Kaian;
- Peng, Qing;
- Ye, Chenliang;
- Huang, Aijian;
- Cheong, Weng-Chon;
- Chen, Zheng;
- Lin, Rui;
- Zhao, Di;
- Tan, Xin;
- Zhuang, Zewen;
- Chen, Chen;
- Wang, Dingsheng;
- Li, Yadong
Publication type:
Article
Direct Microenvironment Modulation of CO2 Electroreduction: Negatively Charged Ag Sites Going beyond Catalytic Surface Reactions.
Published in:
Angewandte Chemie International Edition, 2024, v. 63, n. 37, p. 1, doi. 10.1002/anie.202408580
By:
- Dai, Ruoyun;
- Sun, Kaian;
- Shen, Rongan;
- Fang, Jinjie;
- Cheong, Weng‐Chon;
- Zhuang, Zewen;
- Zhuang, Zhongbin;
- Zhang, Chao;
- Chen, Chen
Publication type:
Article
Okra‐Like Fe7S8/C@ZnS/N‐C@C with Core–Double‐Shelled Structures as Robust and High‐Rate Sodium Anode.
Published in:
Small, 2020, v. 16, n. 35, p. 1, doi. 10.1002/smll.201907641
By:
- Cao, Dongwei;
- Kang, Wenpei;
- Wang, Wenhong;
- Sun, Kaian;
- Wang, Yuyu;
- Ma, Ping;
- Sun, Daofeng
Publication type:
Article
Distinct Crystal‐Facet‐Dependent Behaviors for Single‐Atom Palladium‐On‐Ceria Catalysts: Enhanced Stabilization and Catalytic Properties.
Published in:
Advanced Materials, 2022, v. 34, n. 16, p. 1, doi. 10.1002/adma.202107721
By:
- Hu, Botao;
- Sun, Kaian;
- Zhuang, Zewen;
- Chen, Zheng;
- Liu, Shoujie;
- Cheong, Weng‐Chon;
- Chen, Cheng;
- Hu, Mingzhen;
- Cao, Xing;
- Ma, Junguo;
- Tu, Renyong;
- Zheng, Xusheng;
- Xiao, Hai;
- Chen, Xiao;
- Cui, Yi;
- Peng, Qing;
- Chen, Chen;
- Li, Yadong
Publication type:
Article
Photosynthesis of Benzonitriles on BiOBr Nanosheets Promoted by Vacancy Associates.
Published in:
Angewandte Chemie International Edition, 2023, v. 62, n. 49, p. 1, doi. 10.1002/anie.202313325
By:
- Han, Tong;
- Cao, Xing;
- Chen, Hsiao‐Chien;
- Ma, Junguo;
- Yu, Yuan;
- Li, Yuhuan;
- Xu, Wei;
- Sun, Kaian;
- Huang, Aijian;
- Chen, Zheng;
- Chen, Chen;
- Zhang, Hongjun;
- Ye, Bangjiao;
- Peng, Qing;
- Li, Yadong
Publication type:
Article
Direct Oxygen‐Oxygen Cleavage through Optimizing Interatomic Distances in Dual Single‐atom Electrocatalysts for Efficient Oxygen Reduction Reaction.
Published in:
Angewandte Chemie International Edition, 2023, v. 62, n. 17, p. 1, doi. 10.1002/anie.202301833
By:
- Xie, Yuhan;
- Chen, Xin;
- Sun, Kaian;
- Zhang, Jinqiang;
- Lai, Wei‐Hong;
- Liu, Hao;
- Wang, Guoxiu
Publication type:
Article
Synergistically Interactive Pyridinic‐N–MoP Sites: Identified Active Centers for Enhanced Hydrogen Evolution in Alkaline Solution.
Published in:
Angewandte Chemie International Edition, 2020, v. 59, n. 23, p. 8982, doi. 10.1002/anie.201908760
By:
- Zhao, Di;
- Sun, Kaian;
- Cheong, Weng‐Chon;
- Zheng, Lirong;
- Zhang, Chao;
- Liu, Shoujie;
- Cao, Xing;
- Wu, Konglin;
- Pan, Yuan;
- Zhuang, Zewen;
- Hu, Botao;
- Wang, Dingsheng;
- Peng, Qing;
- Chen, Chen;
- Li, Yadong
Publication type:
Article
A Bimetallic Zn/Fe Polyphthalocyanine‐Derived Single‐Atom Fe‐N4 Catalytic Site:A Superior Trifunctional Catalyst for Overall Water Splitting and Zn–Air Batteries.
Published in:
Angewandte Chemie International Edition, 2018, v. 57, n. 28, p. 8614, doi. 10.1002/anie.201804349
By:
- Pan, Yuan;
- Liu, Shoujie;
- Sun, Kaian;
- Chen, Xin;
- Wang, Bin;
- Wu, Konglin;
- Cao, Xing;
- Cheong, Weng‐Chon;
- Shen, Rongan;
- Han, Aijuan;
- Chen, Zheng;
- Zheng, Lirong;
- Luo, Jun;
- Lin, Yan;
- Liu, Yunqi;
- Wang, Dingsheng;
- Peng, Qing;
- Zhang, Qiang;
- Chen, Chen;
- Li, Yadong
Publication type:
Article
Isolated Single‐Atom Ruthenium Anchored on Beta Zeolite as an Efficient Heterogeneous Catalyst for Styrene Epoxidation.
Published in:
ChemNanoMat, 2020, v. 6, n. 11, p. 1647, doi. 10.1002/cnma.202000394
By:
- Yang, Hongling;
- Liu, Qinggang;
- Li, Yang;
- Sun, Kaian;
- Chen, Zhiqiang;
- Peng, Qing;
- Chen, Chen
Publication type:
Article
Interfacial water engineering boosts neutral water reduction.
Published in:
Nature Communications, 2022, v. 13, n. 1, p. 1, doi. 10.1038/s41467-022-33984-5
By:
- Sun, Kaian;
- Wu, Xueyan;
- Zhuang, Zewen;
- Liu, Leyu;
- Fang, Jinjie;
- Zeng, Lingyou;
- Ma, Junguo;
- Liu, Shoujie;
- Li, Jiazhan;
- Dai, Ruoyun;
- Tan, Xin;
- Yu, Ke;
- Liu, Di;
- Cheong, Weng-Chon;
- Huang, Aijian;
- Liu, Yunqi;
- Pan, Yuan;
- Xiao, Hai;
- Chen, Chen
Publication type:
Article
Rationally engineered Co and N co-doped WS2 as bifunctional catalysts for pH-universal hydrogen evolution and oxidative dehydrogenation reactions.
Published in:
Nano Research, 2022, v. 15, n. 3, p. 1993, doi. 10.1007/s12274-021-3898-6
By:
- Ling, Min;
- Li, Na;
- Jiang, Binbin;
- Tu, Renyong;
- Wu, Tao;
- Guan, Pingli;
- Ye, Yin;
- Cheong, Weng-Chon Max;
- Sun, Kaian;
- Liu, Shoujie;
- Wu, Konglin;
- Huang, Aijian;
- Wei, Xianwen
Publication type:
Article
Reaction environment self-modification on low-coordination Ni2+ octahedra atomic interface for superior electrocatalytic overall water splitting.
Published in:
Nano Research, 2020, v. 13, n. 11, p. 3068, doi. 10.1007/s12274-020-2974-7
By:
- Sun, Kaian;
- Zhao, Lei;
- Zeng, Lingyou;
- Liu, Shoujie;
- Zhu, Houyu;
- Li, Yanpeng;
- Chen, Zheng;
- Zhuang, Zewen;
- Li, Zhaoling;
- Liu, Zhi;
- Cao, Dongwei;
- Zhao, Jinchong;
- Liu, Yunqi;
- Pan, Yuan;
- Chen, Chen
Publication type:
Article
High Durability of Fe–N–C Single‐Atom Catalysts with Carbon Vacancies toward the Oxygen Reduction Reaction in Alkaline Media.
Published in:
Advanced Materials, 2023, v. 35, n. 14, p. 1, doi. 10.1002/adma.202210714
By:
- Tian, Hao;
- Song, Ailing;
- Zhang, Peng;
- Sun, Kaian;
- Wang, Jingjing;
- Sun, Bing;
- Fan, Qiaohui;
- Shao, Guangjie;
- Chen, Chen;
- Liu, Hao;
- Li, Yadong;
- Wang, Guoxiu
Publication type:
Article
High Durability of Fe–N–C Single‐Atom Catalysts with Carbon Vacancies toward the Oxygen Reduction Reaction in Alkaline Media.
Published in:
Advanced Materials, 2023, v. 35, n. 14, p. 1, doi. 10.1002/adma.202210714
By:
- Tian, Hao;
- Song, Ailing;
- Zhang, Peng;
- Sun, Kaian;
- Wang, Jingjing;
- Sun, Bing;
- Fan, Qiaohui;
- Shao, Guangjie;
- Chen, Chen;
- Liu, Hao;
- Li, Yadong;
- Wang, Guoxiu
Publication type:
Article
Nature‐Inspired Design of Molybdenum–Selenium Dual‐Single‐Atom Electrocatalysts for CO2 Reduction.
Published in:
Advanced Materials, 2022, v. 34, n. 44, p. 1, doi. 10.1002/adma.202206478
By:
- Sun, Kaian;
- Yu, Ke;
- Fang, Jinjie;
- Zhuang, Zewen;
- Tan, Xin;
- Wu, Yue;
- Zeng, Lingyou;
- Zhuang, Zhongbin;
- Pan, Yuan;
- Chen, Chen
Publication type:
Article
Three-dimensional open nano-netcage electrocatalysts for efficient pH-universal overall water splitting.
Published in:
Nature Communications, 2019, v. 10, n. 1, p. 1, doi. 10.1038/s41467-019-12885-0
By:
- Zhuang, Zewen;
- Wang, Yu;
- Xu, Cong-Qiao;
- Liu, Shoujie;
- Chen, Chen;
- Peng, Qing;
- Zhuang, Zhongbin;
- Xiao, Hai;
- Pan, Yuan;
- Lu, Siqi;
- Yu, Rong;
- Cheong, Weng-Chon;
- Cao, Xing;
- Wu, Konglin;
- Sun, Kaian;
- Wang, Dingsheng;
- Li, Jun;
- Li, Yadong
Publication type:
Article
Targeted bottom-up synthesis of 1T-phase MoS2 arrays with high electrocatalytic hydrogen evolution activity by simultaneous structure and morphology engineering.
Published in:
Nano Research, 2018, v. 11, n. 8, p. 4368, doi. 10.1007/s12274-018-2026-8
By:
- Sun, Kaian;
- Liu, Yunqi;
- Pan, Yuan;
- Zhu, Houyu;
- Zhao, Jinchong;
- Zeng, Lingyou;
- Liu, Zhi;
- Liu, Chenguang
Publication type:
Article
A Bimetallic Zn/Fe Polyphthalocyanine‐Derived Single‐Atom Fe‐N4 Catalytic Site:A Superior Trifunctional Catalyst for Overall Water Splitting and Zn–Air Batteries.
Published in:
Angewandte Chemie, 2018, v. 130, n. 28, p. 8750, doi. 10.1002/ange.201804349
By:
- Pan, Yuan;
- Liu, Shoujie;
- Sun, Kaian;
- Chen, Xin;
- Wang, Bin;
- Wu, Konglin;
- Cao, Xing;
- Cheong, Weng‐Chon;
- Shen, Rongan;
- Han, Aijuan;
- Chen, Zheng;
- Zheng, Lirong;
- Luo, Jun;
- Lin, Yan;
- Liu, Yunqi;
- Wang, Dingsheng;
- Peng, Qing;
- Zhang, Qiang;
- Chen, Chen;
- Li, Yadong
Publication type:
Article
Construction of CoP/NiCoP Nanotadpoles Heterojunction Interface for Wide pH Hydrogen Evolution Electrocatalysis and Supercapacitor.
Published in:
Advanced Energy Materials, 2019, v. 9, n. 36, p. N.PAG, doi. 10.1002/aenm.201901213
By:
- Lin, Yan;
- Sun, Kaian;
- Liu, Shoujie;
- Chen, Xiaomeng;
- Cheng, Yuansheng;
- Cheong, Weng‐Chon;
- Chen, Zheng;
- Zheng, Lirong;
- Zhang, Jun;
- Li, Xiyou;
- Pan, Yuan;
- Chen, Chen
Publication type:
Article
Oxalate‐Assisted Synthesis of Hollow Carbon Nanocage With Fe Single Atoms for Electrochemical CO2 Reduction.
Published in:
Small, 2023, v. 19, n. 39, p. 1, doi. 10.1002/smll.202302611
By:
- Yu, Ke;
- Sun, Kaian;
- Cheong, Weng‐Chon;
- Tan, Xin;
- He, Chang;
- Zhang, Jiaqi;
- Li, Jiazhan;
- Chen, Chen
Publication type:
Article
Atomically Dispersed CoN3C1‐TeN1C3 Diatomic Sites Anchored in N‐Doped Carbon as Efficient Bifunctional Catalyst for Synergistic Electrocatalytic Hydrogen Evolution and Oxygen Reduction (Small 29/2022)
Published in:
Small, 2022, v. 18, n. 29, p. 1, doi. 10.1002/smll.202201974
By:
- Wang, Minmin;
- Zheng, Xiuhui;
- Qin, Donglin;
- Li, Min;
- Sun, Kaian;
- Liu, Chuhao;
- Cheong, Weng‐Chon;
- Liu, Zhi;
- Chen, Yanju;
- Liu, Shoujie;
- Wang, Bin;
- Li, Yanpeng;
- Liu, Yunqi;
- Liu, Chenguang;
- Yang, Xuan;
- Feng, Xiang;
- Yang, Chaohe;
- Chen, Chen;
- Pan, Yuan
Publication type:
Article
Atomically Dispersed CoN3C1‐TeN1C3 Diatomic Sites Anchored in N‐Doped Carbon as Efficient Bifunctional Catalyst for Synergistic Electrocatalytic Hydrogen Evolution and Oxygen Reduction.
Published in:
Small, 2022, v. 18, n. 29, p. 1, doi. 10.1002/smll.202201974
By:
- Wang, Minmin;
- Zheng, Xiuhui;
- Qin, Donglin;
- Li, Min;
- Sun, Kaian;
- Liu, Chuhao;
- Cheong, Weng‐Chon;
- Liu, Zhi;
- Chen, Yanju;
- Liu, Shoujie;
- Wang, Bin;
- Li, Yanpeng;
- Liu, Yunqi;
- Liu, Chenguang;
- Yang, Xuan;
- Feng, Xiang;
- Yang, Chaohe;
- Chen, Chen;
- Pan, Yuan
Publication type:
Article

Works by Sun, Kaian

Photosynthesis of Benzonitriles on BiOBr Nanosheets Promoted by Vacancy Associates.

Direct Oxygen‐Oxygen Cleavage through Optimizing Interatomic Distances in Dual Single‐atom Electrocatalysts for Efficient Oxygen Reduction Reaction.

Synergistically Interactive Pyridinic‐N–MoP Sites: Identified Active Centers for Enhanced Hydrogen Evolution in Alkaline Solution.

Direct Microenvironment Modulation of CO<sub>2</sub> Electroreduction: Negatively Charged Ag Sites Going beyond Catalytic Surface Reactions.

Anti-dissolution Pt single site with Pt(OH)(O<sub>3</sub>)/Co(P) coordination for efficient alkaline water splitting electrolyzer.

Anti-dissolution Pt single site with Pt(OH)(O<sub>3</sub>)/Co(P) coordination for efficient alkaline water splitting electrolyzer.

Author Correction: Anti-dissolution Pt single site with Pt(OH)(O<sub>3</sub>)/Co(P) coordination for efficient alkaline water splitting electrolyzer.

Anti-dissolution Pt single site with Pt(OH)(O<sub>3</sub>)/Co(P) coordination for efficient alkaline water splitting electrolyzer.

Anion-exchange-mediated internal electric field for boosting photogenerated carrier separation and utilization.

Direct Microenvironment Modulation of CO<sub>2</sub> Electroreduction: Negatively Charged Ag Sites Going beyond Catalytic Surface Reactions.

Okra‐Like Fe<sub>7</sub>S<sub>8</sub>/C@ZnS/N‐C@C with Core–Double‐Shelled Structures as Robust and High‐Rate Sodium Anode.

Distinct Crystal‐Facet‐Dependent Behaviors for Single‐Atom Palladium‐On‐Ceria Catalysts: Enhanced Stabilization and Catalytic Properties.

Photosynthesis of Benzonitriles on BiOBr Nanosheets Promoted by Vacancy Associates.

Direct Oxygen‐Oxygen Cleavage through Optimizing Interatomic Distances in Dual Single‐atom Electrocatalysts for Efficient Oxygen Reduction Reaction.

Synergistically Interactive Pyridinic‐N–MoP Sites: Identified Active Centers for Enhanced Hydrogen Evolution in Alkaline Solution.

A Bimetallic Zn/Fe Polyphthalocyanine‐Derived Single‐Atom Fe‐N<sub>4</sub> Catalytic Site:A Superior Trifunctional Catalyst for Overall Water Splitting and Zn–Air Batteries.

Isolated Single‐Atom Ruthenium Anchored on Beta Zeolite as an Efficient Heterogeneous Catalyst for Styrene Epoxidation.

Interfacial water engineering boosts neutral water reduction.

Rationally engineered Co and N co-doped WS<sub>2</sub> as bifunctional catalysts for pH-universal hydrogen evolution and oxidative dehydrogenation reactions.

Reaction environment self-modification on low-coordination Ni<sup>2+</sup> octahedra atomic interface for superior electrocatalytic overall water splitting.

High Durability of Fe–N–C Single‐Atom Catalysts with Carbon Vacancies toward the Oxygen Reduction Reaction in Alkaline Media.

High Durability of Fe–N–C Single‐Atom Catalysts with Carbon Vacancies toward the Oxygen Reduction Reaction in Alkaline Media.

Nature‐Inspired Design of Molybdenum–Selenium Dual‐Single‐Atom Electrocatalysts for CO<sub>2</sub> Reduction.

Three-dimensional open nano-netcage electrocatalysts for efficient pH-universal overall water splitting.

Targeted bottom-up synthesis of 1T-phase MoS<sub>2</sub> arrays with high electrocatalytic hydrogen evolution activity by simultaneous structure and morphology engineering.

A Bimetallic Zn/Fe Polyphthalocyanine‐Derived Single‐Atom Fe‐N<sub>4</sub> Catalytic Site:A Superior Trifunctional Catalyst for Overall Water Splitting and Zn–Air Batteries.

Construction of CoP/NiCoP Nanotadpoles Heterojunction Interface for Wide pH Hydrogen Evolution Electrocatalysis and Supercapacitor.

Oxalate‐Assisted Synthesis of Hollow Carbon Nanocage With Fe Single Atoms for Electrochemical CO<sub>2</sub> Reduction.

Atomically Dispersed CoN<sub>3</sub>C<sub>1</sub>‐TeN<sub>1</sub>C<sub>3</sub> Diatomic Sites Anchored in N‐Doped Carbon as Efficient Bifunctional Catalyst for Synergistic Electrocatalytic Hydrogen Evolution and Oxygen Reduction (Small 29/2022)

Atomically Dispersed CoN<sub>3</sub>C<sub>1</sub>‐TeN<sub>1</sub>C<sub>3</sub> Diatomic Sites Anchored in N‐Doped Carbon as Efficient Bifunctional Catalyst for Synergistic Electrocatalytic Hydrogen Evolution and Oxygen Reduction.